C# 在c中记录击键时键入特殊字符时显示的双字符#

我有一个应用程序，它记录用户按的任何键，但当我用

a

按特殊字符，如

'

，以获得

á

，我得到

''a

；同样，当我想要得到

a

时，我得到

`a

，所以所有特殊字符都被键入两次，然后常规字符被键入两次

我已经找了很久，真的找不到任何东西。但是我注意到问题出在

ToAscii

方法中，没有正确键入字符

public string GetString(IntPtr lParam, int vCode)
{
    try
    {
        bool shift = Keys.Shift == Control.ModifierKeys || Console.CapsLock;

        string value = ""; 

        KeyboardHookStruct MyKeyboardHookStruct = 
            (KeyboardHookStruct)Marshal.PtrToStructure(
                lParam, typeof(KeyboardHookStruct));

        byte[] keyState = new byte[256];
        byte[] inBuffer = new byte[2];

        DllClass.GetKeyboardState(keyState);

        var ascii=
            DllClass.ToAscii(
                MyKeyboardHookStruct.vkCode, 
                MyKeyboardHookStruct.scanCode, 
                keyState, inBuffer, MyKeyboardHookStruct.flags
                );

        if (ascii == 1)
        {
            char key = (char)inBuffer[0];

            if ((shift) && Char.IsLetter(key))
                key = Char.ToUpper(key);

            value = key.ToString();
        }

        return value;
    }
    catch (Exception)
    {
        return "";
    }
}

我是错过了什么还是做错了什么？所有其他角色都工作得很好，但作为双重角色出现的是特殊角色

---

编辑：

int val = -1;

if (IsDeadKey((uint)vCode))
{
    while (val == -1)
    {
        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );
    }
}
else
    val = ToUnicode(
            (uint)MyKeyboardHookStruct.vkCode, 
            (uint)MyKeyboardHookStruct.scanCode, 
            keyState, chars, chars.Length, 0
            );

namespace Gma.UserActivityMonitor {
    using System.Diagnostics;
    using System.Windows.Forms;

    using System.Collections.Generic;
    using System.Linq;

    partial class HookManager {
        private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) {
            // indicates if any of underlaing events set e.Handled flag
            bool handled=false;

            if(nCode>=0) {
                // read structure KeyboardHookStruct at lParam
                var MyKeyboardHookStruct=
                    (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                // raise KeyDown
                if(s_KeyDown!=null&&(wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyDown.Invoke(null, e);
                    handled=e.Handled;
                }

                // raise KeyPress
                if(s_KeyPress!=null&&wParam==WM_KEYDOWN) {
                    var keyText=GetString(lParam, nCode, ref handled);

                    if(""!=keyText) {
                        var keyChar=keyText.First();
                        Debug.Print("keyText => {0}", keyText);

#if false
                        if(AccentFormatter.Combination.Values.Contains(keyChar)) {
                            SendKeys.Send("\b"+keyText);
                            return -1;
                        }
#endif
                    }
                }

                // raise KeyUp
                if(s_KeyUp!=null&&(wParam==WM_KEYUP||wParam==WM_SYSKEYUP)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyUp.Invoke(null, e);
                    handled=handled||e.Handled;
                }
            }

            // if event handled in application do not handoff to other listeners
            if(handled)
                return -1;

            // forward to other application
            return CallNextHookEx(s_KeyboardHookHandle, nCode, wParam, lParam);
        }

        public static String GetString(IntPtr lParam, int vCode, ref bool handled) {
            var MyKeyboardHookStruct=
                (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            bool isDownShift=((GetKeyState(VK_SHIFT)&0x80)==0x80?true:false);
            bool isDownCapslock=(GetKeyState(VK_CAPITAL)!=0?true:false);

            byte[] keyState=new byte[256];
            GetKeyboardState(keyState);
            byte[] inBuffer=new byte[2];

            var keyText="";

            var ascii=
                ToAscii(
                    MyKeyboardHookStruct.VirtualKeyCode,
                    MyKeyboardHookStruct.ScanCode,
                    keyState, inBuffer, MyKeyboardHookStruct.Flags
                    );

            if(ascii==1) {
                char key=(char)inBuffer[0];

                if((isDownCapslock^isDownShift)&&Char.IsLetter(key))
                    key=Char.ToUpper(key);

                KeyPressEventArgs e=new KeyPressEventArgs(key);
                s_KeyPress.Invoke(null, e);
                handled=handled||e.Handled;

                keyText=new String(new[] { e.KeyChar });
                var sequence=KeySequence.Captured(e.KeyChar);

                if(null!=sequence)
                    keyText=sequence.ToString(AccentFormatter.Default);
            }

            return keyText;
        }
    }

    public class KeySequence {
        public String ToString(IFormatProvider provider) {
            return
                null==provider
                    ?new String(Sequence.Select(x => (char)x).ToArray())
                    :String.Format(provider, "{0}", Sequence);
        }

        public override String ToString() {
            return this.ToString(default(IFormatProvider));
        }

        public bool Captures(int keyValue) {
            for(var i=Sequence.Length; i-->0; ) {
                if(Sequence[i]!=keyValue) {
                    if(0==i)
                        Count=0;

                    continue;
                }

                if(Count!=i)
                    continue;

                ++Count;
                break;
            }

            var x=Sequence.Length==Count;
            Count=x?0:Count;
            return x;
        }

        public KeySequence(int[] newSequence) {
            Sequence=newSequence;
        }

        public static KeySequence Captured(int keyValue) {
            return m_List.FirstOrDefault(x => x.Captures(keyValue));
        }

        public int Count {
            private set;
            get;
        }

        public int[] Sequence {
            set;
            get;
        }

        static KeySequence() {
            m_List.AddRange(
                from x in AccentFormatter.Combination.Keys
                let intArray=x.Select(c => (int)c).ToArray()
                select new KeySequence(intArray)
                );
        }

        static readonly List<KeySequence> m_List=new List<KeySequence>();
    }

    public class AccentFormatter: IFormatProvider, ICustomFormatter {
        String ICustomFormatter.Format(String format, object arg, IFormatProvider formatProvider) {
            return GetAccent(new String((arg as int[]).Select(x => (char)x).ToArray()));
        }

        object IFormatProvider.GetFormat(Type formatType) {
            return typeof(ICustomFormatter)!=formatType?null:this;
        }

        public static String GetAccent(String input) {
            return
                Combination.Keys.Contains(input, StringComparer.OrdinalIgnoreCase)
                    ?Combination[input].ToString()
                    :"";
        }

        static AccentFormatter() {
            AcuteSymbol=((char)0xb4).ToString();
            GraveSymbol=('`').ToString();

            var ae=(char)0xe6;
            var oe=(char)0xf8;
            AcuteCandidates="acegiklmnoprsuwyz".ToArray().Concat(new[] { ae, oe }).ToArray();
            GraveCandidates="aeinouwy".ToArray();

            var lowerAcuteAccents=(
                new[] { 
                    0xe1, 0x107, 
                    0xe9, 0x1f5, 
                    0xed, 0x1e31, 0x13a, 0x1e3f, 0x144, 
                    0xf3, 0x1e55, 0x155, 0x15b, 
                    0xfa, 0x1e83, 0xfd, 0x17a, 
                    0x1fd, 0x1ff
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+AcuteCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperAcuteAccents=(
                new[] { 
                    0xc1, 0x106, 
                    0xc9, 0x1f4, 
                    0xcd, 0x1e30, 0x139, 0x1e3e, 0x143, 
                    0xd3, 0x1e54, 0x154, 0x15a, 
                    0xda, 0x1e82, 0xdd, 0x179, 
                    0x1fc, 0x1fe
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+char.ToUpper(AcuteCandidates[i]),
                        Value=(char)x
                    }
                    );

            var lowerGraveAccents=(
                new[] { 0xe0, 0xe8, 0xec, 0x1f9, 0xf2, 0xf9, 0x1e81, 0x1ef3 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+GraveCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperGraveAccents=(
                new[] { 0xc0, 0xc8, 0xcc, 0x1f8, 0xd2, 0xd9, 0x1e80, 0x1ef2 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+char.ToUpper(GraveCandidates[i]),
                        Value=(char)x
                    }
                    );

            Combination=
                lowerAcuteAccents
                    .Concat(upperAcuteAccents)
                    .Concat(lowerGraveAccents)
                    .Concat(upperGraveAccents)
                    .ToDictionary(x => x.Key, x => x.Value);
        }

        public static readonly Dictionary<String, char> Combination;
        public static readonly String AcuteSymbol, GraveSymbol;
        public static readonly char[] AcuteCandidates, GraveCandidates;
        public static readonly AccentFormatter Default=new AccentFormatter();
    }
}

改为尝试使用

ToUnicode

[DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
public static extern int ToUnicode(
    uint virtualKey, uint scanCode, byte[] keyStates, 
    [MarshalAs(UnmanagedType.LPArray)] [Out] char[] chars, 
    int charMaxCount, uint flags);

public string GetString(IntPtr lParam, int vCode)
{
    try
    {
        bool shift = Keys.Shift == Control.ModifierKeys || Console.CapsLock;

        string value = ""; 

        KeyboardHookStruct MyKeyboardHookStruct = 
            (KeyboardHookStruct)Marshal.PtrToStructure(
                lParam, typeof(KeyboardHookStruct));

        byte[] keyState = new byte[256];
        byte[] inBuffer = new byte[2];

        char[] chars = new char[2];

        DllClass.GetKeyboardState(keyState);

        int val = 0;

        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );

        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );

        if (val == 1)
        {
            char key = (char)chars[0];

            if ((shift) && Char.IsLetter(key))
                key = Char.ToUpper(key);

            value = key.ToString();
        }

        return value;
    }
    catch (Exception)
    {
        return "";
    }
}

有人请帮帮我，我真的需要解决这个问题

---

编辑：

int val = -1;

if (IsDeadKey((uint)vCode))
{
    while (val == -1)
    {
        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );
    }
}
else
    val = ToUnicode(
            (uint)MyKeyboardHookStruct.vkCode, 
            (uint)MyKeyboardHookStruct.scanCode, 
            keyState, chars, chars.Length, 0
            );

namespace Gma.UserActivityMonitor {
    using System.Diagnostics;
    using System.Windows.Forms;

    using System.Collections.Generic;
    using System.Linq;

    partial class HookManager {
        private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) {
            // indicates if any of underlaing events set e.Handled flag
            bool handled=false;

            if(nCode>=0) {
                // read structure KeyboardHookStruct at lParam
                var MyKeyboardHookStruct=
                    (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                // raise KeyDown
                if(s_KeyDown!=null&&(wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyDown.Invoke(null, e);
                    handled=e.Handled;
                }

                // raise KeyPress
                if(s_KeyPress!=null&&wParam==WM_KEYDOWN) {
                    var keyText=GetString(lParam, nCode, ref handled);

                    if(""!=keyText) {
                        var keyChar=keyText.First();
                        Debug.Print("keyText => {0}", keyText);

#if false
                        if(AccentFormatter.Combination.Values.Contains(keyChar)) {
                            SendKeys.Send("\b"+keyText);
                            return -1;
                        }
#endif
                    }
                }

                // raise KeyUp
                if(s_KeyUp!=null&&(wParam==WM_KEYUP||wParam==WM_SYSKEYUP)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyUp.Invoke(null, e);
                    handled=handled||e.Handled;
                }
            }

            // if event handled in application do not handoff to other listeners
            if(handled)
                return -1;

            // forward to other application
            return CallNextHookEx(s_KeyboardHookHandle, nCode, wParam, lParam);
        }

        public static String GetString(IntPtr lParam, int vCode, ref bool handled) {
            var MyKeyboardHookStruct=
                (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            bool isDownShift=((GetKeyState(VK_SHIFT)&0x80)==0x80?true:false);
            bool isDownCapslock=(GetKeyState(VK_CAPITAL)!=0?true:false);

            byte[] keyState=new byte[256];
            GetKeyboardState(keyState);
            byte[] inBuffer=new byte[2];

            var keyText="";

            var ascii=
                ToAscii(
                    MyKeyboardHookStruct.VirtualKeyCode,
                    MyKeyboardHookStruct.ScanCode,
                    keyState, inBuffer, MyKeyboardHookStruct.Flags
                    );

            if(ascii==1) {
                char key=(char)inBuffer[0];

                if((isDownCapslock^isDownShift)&&Char.IsLetter(key))
                    key=Char.ToUpper(key);

                KeyPressEventArgs e=new KeyPressEventArgs(key);
                s_KeyPress.Invoke(null, e);
                handled=handled||e.Handled;

                keyText=new String(new[] { e.KeyChar });
                var sequence=KeySequence.Captured(e.KeyChar);

                if(null!=sequence)
                    keyText=sequence.ToString(AccentFormatter.Default);
            }

            return keyText;
        }
    }

    public class KeySequence {
        public String ToString(IFormatProvider provider) {
            return
                null==provider
                    ?new String(Sequence.Select(x => (char)x).ToArray())
                    :String.Format(provider, "{0}", Sequence);
        }

        public override String ToString() {
            return this.ToString(default(IFormatProvider));
        }

        public bool Captures(int keyValue) {
            for(var i=Sequence.Length; i-->0; ) {
                if(Sequence[i]!=keyValue) {
                    if(0==i)
                        Count=0;

                    continue;
                }

                if(Count!=i)
                    continue;

                ++Count;
                break;
            }

            var x=Sequence.Length==Count;
            Count=x?0:Count;
            return x;
        }

        public KeySequence(int[] newSequence) {
            Sequence=newSequence;
        }

        public static KeySequence Captured(int keyValue) {
            return m_List.FirstOrDefault(x => x.Captures(keyValue));
        }

        public int Count {
            private set;
            get;
        }

        public int[] Sequence {
            set;
            get;
        }

        static KeySequence() {
            m_List.AddRange(
                from x in AccentFormatter.Combination.Keys
                let intArray=x.Select(c => (int)c).ToArray()
                select new KeySequence(intArray)
                );
        }

        static readonly List<KeySequence> m_List=new List<KeySequence>();
    }

    public class AccentFormatter: IFormatProvider, ICustomFormatter {
        String ICustomFormatter.Format(String format, object arg, IFormatProvider formatProvider) {
            return GetAccent(new String((arg as int[]).Select(x => (char)x).ToArray()));
        }

        object IFormatProvider.GetFormat(Type formatType) {
            return typeof(ICustomFormatter)!=formatType?null:this;
        }

        public static String GetAccent(String input) {
            return
                Combination.Keys.Contains(input, StringComparer.OrdinalIgnoreCase)
                    ?Combination[input].ToString()
                    :"";
        }

        static AccentFormatter() {
            AcuteSymbol=((char)0xb4).ToString();
            GraveSymbol=('`').ToString();

            var ae=(char)0xe6;
            var oe=(char)0xf8;
            AcuteCandidates="acegiklmnoprsuwyz".ToArray().Concat(new[] { ae, oe }).ToArray();
            GraveCandidates="aeinouwy".ToArray();

            var lowerAcuteAccents=(
                new[] { 
                    0xe1, 0x107, 
                    0xe9, 0x1f5, 
                    0xed, 0x1e31, 0x13a, 0x1e3f, 0x144, 
                    0xf3, 0x1e55, 0x155, 0x15b, 
                    0xfa, 0x1e83, 0xfd, 0x17a, 
                    0x1fd, 0x1ff
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+AcuteCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperAcuteAccents=(
                new[] { 
                    0xc1, 0x106, 
                    0xc9, 0x1f4, 
                    0xcd, 0x1e30, 0x139, 0x1e3e, 0x143, 
                    0xd3, 0x1e54, 0x154, 0x15a, 
                    0xda, 0x1e82, 0xdd, 0x179, 
                    0x1fc, 0x1fe
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+char.ToUpper(AcuteCandidates[i]),
                        Value=(char)x
                    }
                    );

            var lowerGraveAccents=(
                new[] { 0xe0, 0xe8, 0xec, 0x1f9, 0xf2, 0xf9, 0x1e81, 0x1ef3 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+GraveCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperGraveAccents=(
                new[] { 0xc0, 0xc8, 0xcc, 0x1f8, 0xd2, 0xd9, 0x1e80, 0x1ef2 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+char.ToUpper(GraveCandidates[i]),
                        Value=(char)x
                    }
                    );

            Combination=
                lowerAcuteAccents
                    .Concat(upperAcuteAccents)
                    .Concat(lowerGraveAccents)
                    .Concat(upperGraveAccents)
                    .ToDictionary(x => x.Key, x => x.Value);
        }

        public static readonly Dictionary<String, char> Combination;
        public static readonly String AcuteSymbol, GraveSymbol;
        public static readonly char[] AcuteCandidates, GraveCandidates;
        public static readonly AccentFormatter Default=new AccentFormatter();
    }
}

因此，现在我尝试调用

ToAscii

或

ToUnicode

几次来刷新真实角色，但都没有成功。我做错了吗

像ASCII一样，首先调用

'

我得到

-1

，所以我再次调用它，然后得到

1

；然后我按like

a

，得到

a

，但我只得到

a

。同样的事情，如果我在两次之后使用

ToUnicode

，我得到的只是

a

，而不是

a

，依此类推

但是我注意到问题出在ToAsciii方法中，如果没有输入正确的字符

这正是我要猜的。我很感激你为我做了这些工作！：-）

问题是这些“特殊”字符不是ASCII字符。也就是说，它们实际上是某种类型的Unicode字符，不属于ASCII字符集

当您尝试将它们转换为ASCII字符时，该函数可能会尽其所能，将构成

的代码点分解为单独的字符
'
和
a

显然那不是你想要的。您希望将
视为单个字符，因此需要使用Unicode。这并不是一个真正的问题：Windows在内部使用Unicode至少有十年了。摒弃陈旧的功能；相反，您需要使用或将通过低级键盘挂钩获得的虚拟键代码转换为字符值。

关于
ToAscii
和
ToUnicode
的神话

int val = -1;

if (IsDeadKey((uint)vCode))
{
    while (val == -1)
    {
        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );
    }
}
else
    val = ToUnicode(
            (uint)MyKeyboardHookStruct.vkCode, 
            (uint)MyKeyboardHookStruct.scanCode, 
            keyState, chars, chars.Length, 0
            );

namespace Gma.UserActivityMonitor {
    using System.Diagnostics;
    using System.Windows.Forms;

    using System.Collections.Generic;
    using System.Linq;

    partial class HookManager {
        private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) {
            // indicates if any of underlaing events set e.Handled flag
            bool handled=false;

            if(nCode>=0) {
                // read structure KeyboardHookStruct at lParam
                var MyKeyboardHookStruct=
                    (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                // raise KeyDown
                if(s_KeyDown!=null&&(wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyDown.Invoke(null, e);
                    handled=e.Handled;
                }

                // raise KeyPress
                if(s_KeyPress!=null&&wParam==WM_KEYDOWN) {
                    var keyText=GetString(lParam, nCode, ref handled);

                    if(""!=keyText) {
                        var keyChar=keyText.First();
                        Debug.Print("keyText => {0}", keyText);

#if false
                        if(AccentFormatter.Combination.Values.Contains(keyChar)) {
                            SendKeys.Send("\b"+keyText);
                            return -1;
                        }
#endif
                    }
                }

                // raise KeyUp
                if(s_KeyUp!=null&&(wParam==WM_KEYUP||wParam==WM_SYSKEYUP)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyUp.Invoke(null, e);
                    handled=handled||e.Handled;
                }
            }

            // if event handled in application do not handoff to other listeners
            if(handled)
                return -1;

            // forward to other application
            return CallNextHookEx(s_KeyboardHookHandle, nCode, wParam, lParam);
        }

        public static String GetString(IntPtr lParam, int vCode, ref bool handled) {
            var MyKeyboardHookStruct=
                (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            bool isDownShift=((GetKeyState(VK_SHIFT)&0x80)==0x80?true:false);
            bool isDownCapslock=(GetKeyState(VK_CAPITAL)!=0?true:false);

            byte[] keyState=new byte[256];
            GetKeyboardState(keyState);
            byte[] inBuffer=new byte[2];

            var keyText="";

            var ascii=
                ToAscii(
                    MyKeyboardHookStruct.VirtualKeyCode,
                    MyKeyboardHookStruct.ScanCode,
                    keyState, inBuffer, MyKeyboardHookStruct.Flags
                    );

            if(ascii==1) {
                char key=(char)inBuffer[0];

                if((isDownCapslock^isDownShift)&&Char.IsLetter(key))
                    key=Char.ToUpper(key);

                KeyPressEventArgs e=new KeyPressEventArgs(key);
                s_KeyPress.Invoke(null, e);
                handled=handled||e.Handled;

                keyText=new String(new[] { e.KeyChar });
                var sequence=KeySequence.Captured(e.KeyChar);

                if(null!=sequence)
                    keyText=sequence.ToString(AccentFormatter.Default);
            }

            return keyText;
        }
    }

    public class KeySequence {
        public String ToString(IFormatProvider provider) {
            return
                null==provider
                    ?new String(Sequence.Select(x => (char)x).ToArray())
                    :String.Format(provider, "{0}", Sequence);
        }

        public override String ToString() {
            return this.ToString(default(IFormatProvider));
        }

        public bool Captures(int keyValue) {
            for(var i=Sequence.Length; i-->0; ) {
                if(Sequence[i]!=keyValue) {
                    if(0==i)
                        Count=0;

                    continue;
                }

                if(Count!=i)
                    continue;

                ++Count;
                break;
            }

            var x=Sequence.Length==Count;
            Count=x?0:Count;
            return x;
        }

        public KeySequence(int[] newSequence) {
            Sequence=newSequence;
        }

        public static KeySequence Captured(int keyValue) {
            return m_List.FirstOrDefault(x => x.Captures(keyValue));
        }

        public int Count {
            private set;
            get;
        }

        public int[] Sequence {
            set;
            get;
        }

        static KeySequence() {
            m_List.AddRange(
                from x in AccentFormatter.Combination.Keys
                let intArray=x.Select(c => (int)c).ToArray()
                select new KeySequence(intArray)
                );
        }

        static readonly List<KeySequence> m_List=new List<KeySequence>();
    }

    public class AccentFormatter: IFormatProvider, ICustomFormatter {
        String ICustomFormatter.Format(String format, object arg, IFormatProvider formatProvider) {
            return GetAccent(new String((arg as int[]).Select(x => (char)x).ToArray()));
        }

        object IFormatProvider.GetFormat(Type formatType) {
            return typeof(ICustomFormatter)!=formatType?null:this;
        }

        public static String GetAccent(String input) {
            return
                Combination.Keys.Contains(input, StringComparer.OrdinalIgnoreCase)
                    ?Combination[input].ToString()
                    :"";
        }

        static AccentFormatter() {
            AcuteSymbol=((char)0xb4).ToString();
            GraveSymbol=('`').ToString();

            var ae=(char)0xe6;
            var oe=(char)0xf8;
            AcuteCandidates="acegiklmnoprsuwyz".ToArray().Concat(new[] { ae, oe }).ToArray();
            GraveCandidates="aeinouwy".ToArray();

            var lowerAcuteAccents=(
                new[] { 
                    0xe1, 0x107, 
                    0xe9, 0x1f5, 
                    0xed, 0x1e31, 0x13a, 0x1e3f, 0x144, 
                    0xf3, 0x1e55, 0x155, 0x15b, 
                    0xfa, 0x1e83, 0xfd, 0x17a, 
                    0x1fd, 0x1ff
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+AcuteCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperAcuteAccents=(
                new[] { 
                    0xc1, 0x106, 
                    0xc9, 0x1f4, 
                    0xcd, 0x1e30, 0x139, 0x1e3e, 0x143, 
                    0xd3, 0x1e54, 0x154, 0x15a, 
                    0xda, 0x1e82, 0xdd, 0x179, 
                    0x1fc, 0x1fe
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+char.ToUpper(AcuteCandidates[i]),
                        Value=(char)x
                    }
                    );

            var lowerGraveAccents=(
                new[] { 0xe0, 0xe8, 0xec, 0x1f9, 0xf2, 0xf9, 0x1e81, 0x1ef3 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+GraveCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperGraveAccents=(
                new[] { 0xc0, 0xc8, 0xcc, 0x1f8, 0xd2, 0xd9, 0x1e80, 0x1ef2 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+char.ToUpper(GraveCandidates[i]),
                        Value=(char)x
                    }
                    );

            Combination=
                lowerAcuteAccents
                    .Concat(upperAcuteAccents)
                    .Concat(lowerGraveAccents)
                    .Concat(upperGraveAccents)
                    .ToDictionary(x => x.Key, x => x.Value);
        }

        public static readonly Dictionary<String, char> Combination;
        public static readonly String AcuteSymbol, GraveSymbol;
        public static readonly char[] AcuteCandidates, GraveCandidates;
        public static readonly AccentFormatter Default=new AccentFormatter();
    }
}

在问题中，您提到您尝试了
ToAscii
和
ToUnicode
，但均未成功。我还搜索了一个相对的问题：


我不是说任何答案是对的或错的。然而，我们可以考虑：


一个（不那么）棘手的游戏

在这个游戏中，我一次给玩家一枚随机翻转的50美分硬币。如果谁收集了一对50美分的硬币，一个是头，另一个是尾，的话，你可以向我索要一张一美元的钞票

如果一个人放弃了挑战，那么谁能保留那50美分，游戏就会重新开始。如果谁试过，但没有收集到两个符合规定的，那么我要求退还我给的

怎样才能从我这里得到一美元而不丢失任何硬币？

int val = -1;

if (IsDeadKey((uint)vCode))
{
    while (val == -1)
    {
        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );
    }
}
else
    val = ToUnicode(
            (uint)MyKeyboardHookStruct.vkCode, 
            (uint)MyKeyboardHookStruct.scanCode, 
            keyState, chars, chars.Length, 0
            );

namespace Gma.UserActivityMonitor {
    using System.Diagnostics;
    using System.Windows.Forms;

    using System.Collections.Generic;
    using System.Linq;

    partial class HookManager {
        private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) {
            // indicates if any of underlaing events set e.Handled flag
            bool handled=false;

            if(nCode>=0) {
                // read structure KeyboardHookStruct at lParam
                var MyKeyboardHookStruct=
                    (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                // raise KeyDown
                if(s_KeyDown!=null&&(wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyDown.Invoke(null, e);
                    handled=e.Handled;
                }

                // raise KeyPress
                if(s_KeyPress!=null&&wParam==WM_KEYDOWN) {
                    var keyText=GetString(lParam, nCode, ref handled);

                    if(""!=keyText) {
                        var keyChar=keyText.First();
                        Debug.Print("keyText => {0}", keyText);

#if false
                        if(AccentFormatter.Combination.Values.Contains(keyChar)) {
                            SendKeys.Send("\b"+keyText);
                            return -1;
                        }
#endif
                    }
                }

                // raise KeyUp
                if(s_KeyUp!=null&&(wParam==WM_KEYUP||wParam==WM_SYSKEYUP)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyUp.Invoke(null, e);
                    handled=handled||e.Handled;
                }
            }

            // if event handled in application do not handoff to other listeners
            if(handled)
                return -1;

            // forward to other application
            return CallNextHookEx(s_KeyboardHookHandle, nCode, wParam, lParam);
        }

        public static String GetString(IntPtr lParam, int vCode, ref bool handled) {
            var MyKeyboardHookStruct=
                (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            bool isDownShift=((GetKeyState(VK_SHIFT)&0x80)==0x80?true:false);
            bool isDownCapslock=(GetKeyState(VK_CAPITAL)!=0?true:false);

            byte[] keyState=new byte[256];
            GetKeyboardState(keyState);
            byte[] inBuffer=new byte[2];

            var keyText="";

            var ascii=
                ToAscii(
                    MyKeyboardHookStruct.VirtualKeyCode,
                    MyKeyboardHookStruct.ScanCode,
                    keyState, inBuffer, MyKeyboardHookStruct.Flags
                    );

            if(ascii==1) {
                char key=(char)inBuffer[0];

                if((isDownCapslock^isDownShift)&&Char.IsLetter(key))
                    key=Char.ToUpper(key);

                KeyPressEventArgs e=new KeyPressEventArgs(key);
                s_KeyPress.Invoke(null, e);
                handled=handled||e.Handled;

                keyText=new String(new[] { e.KeyChar });
                var sequence=KeySequence.Captured(e.KeyChar);

                if(null!=sequence)
                    keyText=sequence.ToString(AccentFormatter.Default);
            }

            return keyText;
        }
    }

    public class KeySequence {
        public String ToString(IFormatProvider provider) {
            return
                null==provider
                    ?new String(Sequence.Select(x => (char)x).ToArray())
                    :String.Format(provider, "{0}", Sequence);
        }

        public override String ToString() {
            return this.ToString(default(IFormatProvider));
        }

        public bool Captures(int keyValue) {
            for(var i=Sequence.Length; i-->0; ) {
                if(Sequence[i]!=keyValue) {
                    if(0==i)
                        Count=0;

                    continue;
                }

                if(Count!=i)
                    continue;

                ++Count;
                break;
            }

            var x=Sequence.Length==Count;
            Count=x?0:Count;
            return x;
        }

        public KeySequence(int[] newSequence) {
            Sequence=newSequence;
        }

        public static KeySequence Captured(int keyValue) {
            return m_List.FirstOrDefault(x => x.Captures(keyValue));
        }

        public int Count {
            private set;
            get;
        }

        public int[] Sequence {
            set;
            get;
        }

        static KeySequence() {
            m_List.AddRange(
                from x in AccentFormatter.Combination.Keys
                let intArray=x.Select(c => (int)c).ToArray()
                select new KeySequence(intArray)
                );
        }

        static readonly List<KeySequence> m_List=new List<KeySequence>();
    }

    public class AccentFormatter: IFormatProvider, ICustomFormatter {
        String ICustomFormatter.Format(String format, object arg, IFormatProvider formatProvider) {
            return GetAccent(new String((arg as int[]).Select(x => (char)x).ToArray()));
        }

        object IFormatProvider.GetFormat(Type formatType) {
            return typeof(ICustomFormatter)!=formatType?null:this;
        }

        public static String GetAccent(String input) {
            return
                Combination.Keys.Contains(input, StringComparer.OrdinalIgnoreCase)
                    ?Combination[input].ToString()
                    :"";
        }

        static AccentFormatter() {
            AcuteSymbol=((char)0xb4).ToString();
            GraveSymbol=('`').ToString();

            var ae=(char)0xe6;
            var oe=(char)0xf8;
            AcuteCandidates="acegiklmnoprsuwyz".ToArray().Concat(new[] { ae, oe }).ToArray();
            GraveCandidates="aeinouwy".ToArray();

            var lowerAcuteAccents=(
                new[] { 
                    0xe1, 0x107, 
                    0xe9, 0x1f5, 
                    0xed, 0x1e31, 0x13a, 0x1e3f, 0x144, 
                    0xf3, 0x1e55, 0x155, 0x15b, 
                    0xfa, 0x1e83, 0xfd, 0x17a, 
                    0x1fd, 0x1ff
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+AcuteCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperAcuteAccents=(
                new[] { 
                    0xc1, 0x106, 
                    0xc9, 0x1f4, 
                    0xcd, 0x1e30, 0x139, 0x1e3e, 0x143, 
                    0xd3, 0x1e54, 0x154, 0x15a, 
                    0xda, 0x1e82, 0xdd, 0x179, 
                    0x1fc, 0x1fe
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+char.ToUpper(AcuteCandidates[i]),
                        Value=(char)x
                    }
                    );

            var lowerGraveAccents=(
                new[] { 0xe0, 0xe8, 0xec, 0x1f9, 0xf2, 0xf9, 0x1e81, 0x1ef3 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+GraveCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperGraveAccents=(
                new[] { 0xc0, 0xc8, 0xcc, 0x1f8, 0xd2, 0xd9, 0x1e80, 0x1ef2 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+char.ToUpper(GraveCandidates[i]),
                        Value=(char)x
                    }
                    );

            Combination=
                lowerAcuteAccents
                    .Concat(upperAcuteAccents)
                    .Concat(lowerGraveAccents)
                    .Concat(upperGraveAccents)
                    .ToDictionary(x => x.Key, x => x.Value);
        }

        public static readonly Dictionary<String, char> Combination;
        public static readonly String AcuteSymbol, GraveSymbol;
        public static readonly char[] AcuteCandidates, GraveCandidates;
        public static readonly AccentFormatter Default=new AccentFormatter();
    }
}


也许是时间旅行



基于CodeProject上的[]

我的老生常谈是：

为了回答你的问题，我做了一些修改


代码

int val = -1;

if (IsDeadKey((uint)vCode))
{
    while (val == -1)
    {
        val = ToUnicode(
                (uint)MyKeyboardHookStruct.vkCode, 
                (uint)MyKeyboardHookStruct.scanCode, 
                keyState, chars, chars.Length, 0
                );
    }
}
else
    val = ToUnicode(
            (uint)MyKeyboardHookStruct.vkCode, 
            (uint)MyKeyboardHookStruct.scanCode, 
            keyState, chars, chars.Length, 0
            );

namespace Gma.UserActivityMonitor {
    using System.Diagnostics;
    using System.Windows.Forms;

    using System.Collections.Generic;
    using System.Linq;

    partial class HookManager {
        private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) {
            // indicates if any of underlaing events set e.Handled flag
            bool handled=false;

            if(nCode>=0) {
                // read structure KeyboardHookStruct at lParam
                var MyKeyboardHookStruct=
                    (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

                // raise KeyDown
                if(s_KeyDown!=null&&(wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyDown.Invoke(null, e);
                    handled=e.Handled;
                }

                // raise KeyPress
                if(s_KeyPress!=null&&wParam==WM_KEYDOWN) {
                    var keyText=GetString(lParam, nCode, ref handled);

                    if(""!=keyText) {
                        var keyChar=keyText.First();
                        Debug.Print("keyText => {0}", keyText);

#if false
                        if(AccentFormatter.Combination.Values.Contains(keyChar)) {
                            SendKeys.Send("\b"+keyText);
                            return -1;
                        }
#endif
                    }
                }

                // raise KeyUp
                if(s_KeyUp!=null&&(wParam==WM_KEYUP||wParam==WM_SYSKEYUP)) {
                    Keys keyData=(Keys)MyKeyboardHookStruct.VirtualKeyCode;
                    KeyEventArgs e=new KeyEventArgs(keyData);
                    s_KeyUp.Invoke(null, e);
                    handled=handled||e.Handled;
                }
            }

            // if event handled in application do not handoff to other listeners
            if(handled)
                return -1;

            // forward to other application
            return CallNextHookEx(s_KeyboardHookHandle, nCode, wParam, lParam);
        }

        public static String GetString(IntPtr lParam, int vCode, ref bool handled) {
            var MyKeyboardHookStruct=
                (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

            bool isDownShift=((GetKeyState(VK_SHIFT)&0x80)==0x80?true:false);
            bool isDownCapslock=(GetKeyState(VK_CAPITAL)!=0?true:false);

            byte[] keyState=new byte[256];
            GetKeyboardState(keyState);
            byte[] inBuffer=new byte[2];

            var keyText="";

            var ascii=
                ToAscii(
                    MyKeyboardHookStruct.VirtualKeyCode,
                    MyKeyboardHookStruct.ScanCode,
                    keyState, inBuffer, MyKeyboardHookStruct.Flags
                    );

            if(ascii==1) {
                char key=(char)inBuffer[0];

                if((isDownCapslock^isDownShift)&&Char.IsLetter(key))
                    key=Char.ToUpper(key);

                KeyPressEventArgs e=new KeyPressEventArgs(key);
                s_KeyPress.Invoke(null, e);
                handled=handled||e.Handled;

                keyText=new String(new[] { e.KeyChar });
                var sequence=KeySequence.Captured(e.KeyChar);

                if(null!=sequence)
                    keyText=sequence.ToString(AccentFormatter.Default);
            }

            return keyText;
        }
    }

    public class KeySequence {
        public String ToString(IFormatProvider provider) {
            return
                null==provider
                    ?new String(Sequence.Select(x => (char)x).ToArray())
                    :String.Format(provider, "{0}", Sequence);
        }

        public override String ToString() {
            return this.ToString(default(IFormatProvider));
        }

        public bool Captures(int keyValue) {
            for(var i=Sequence.Length; i-->0; ) {
                if(Sequence[i]!=keyValue) {
                    if(0==i)
                        Count=0;

                    continue;
                }

                if(Count!=i)
                    continue;

                ++Count;
                break;
            }

            var x=Sequence.Length==Count;
            Count=x?0:Count;
            return x;
        }

        public KeySequence(int[] newSequence) {
            Sequence=newSequence;
        }

        public static KeySequence Captured(int keyValue) {
            return m_List.FirstOrDefault(x => x.Captures(keyValue));
        }

        public int Count {
            private set;
            get;
        }

        public int[] Sequence {
            set;
            get;
        }

        static KeySequence() {
            m_List.AddRange(
                from x in AccentFormatter.Combination.Keys
                let intArray=x.Select(c => (int)c).ToArray()
                select new KeySequence(intArray)
                );
        }

        static readonly List<KeySequence> m_List=new List<KeySequence>();
    }

    public class AccentFormatter: IFormatProvider, ICustomFormatter {
        String ICustomFormatter.Format(String format, object arg, IFormatProvider formatProvider) {
            return GetAccent(new String((arg as int[]).Select(x => (char)x).ToArray()));
        }

        object IFormatProvider.GetFormat(Type formatType) {
            return typeof(ICustomFormatter)!=formatType?null:this;
        }

        public static String GetAccent(String input) {
            return
                Combination.Keys.Contains(input, StringComparer.OrdinalIgnoreCase)
                    ?Combination[input].ToString()
                    :"";
        }

        static AccentFormatter() {
            AcuteSymbol=((char)0xb4).ToString();
            GraveSymbol=('`').ToString();

            var ae=(char)0xe6;
            var oe=(char)0xf8;
            AcuteCandidates="acegiklmnoprsuwyz".ToArray().Concat(new[] { ae, oe }).ToArray();
            GraveCandidates="aeinouwy".ToArray();

            var lowerAcuteAccents=(
                new[] { 
                    0xe1, 0x107, 
                    0xe9, 0x1f5, 
                    0xed, 0x1e31, 0x13a, 0x1e3f, 0x144, 
                    0xf3, 0x1e55, 0x155, 0x15b, 
                    0xfa, 0x1e83, 0xfd, 0x17a, 
                    0x1fd, 0x1ff
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+AcuteCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperAcuteAccents=(
                new[] { 
                    0xc1, 0x106, 
                    0xc9, 0x1f4, 
                    0xcd, 0x1e30, 0x139, 0x1e3e, 0x143, 
                    0xd3, 0x1e54, 0x154, 0x15a, 
                    0xda, 0x1e82, 0xdd, 0x179, 
                    0x1fc, 0x1fe
                }
                ).Select(
                    (x, i) => new {
                        Key=AcuteSymbol+char.ToUpper(AcuteCandidates[i]),
                        Value=(char)x
                    }
                    );

            var lowerGraveAccents=(
                new[] { 0xe0, 0xe8, 0xec, 0x1f9, 0xf2, 0xf9, 0x1e81, 0x1ef3 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+GraveCandidates[i],
                        Value=(char)x
                    }
                    );

            var upperGraveAccents=(
                new[] { 0xc0, 0xc8, 0xcc, 0x1f8, 0xd2, 0xd9, 0x1e80, 0x1ef2 }
                ).Select(
                    (x, i) => new {
                        Key=GraveSymbol+char.ToUpper(GraveCandidates[i]),
                        Value=(char)x
                    }
                    );

            Combination=
                lowerAcuteAccents
                    .Concat(upperAcuteAccents)
                    .Concat(lowerGraveAccents)
                    .Concat(upperGraveAccents)
                    .ToDictionary(x => x.Key, x => x.Value);
        }

        public static readonly Dictionary<String, char> Combination;
        public static readonly String AcuteSymbol, GraveSymbol;
        public static readonly char[] AcuteCandidates, GraveCandidates;
        public static readonly AccentFormatter Default=new AccentFormatter();
    }
}

即：

ÁĆ
ÉǴ
ÍḰĹḾŃ
ÓṔŔŚ
ÚẂÝŹ
ǼǾ
到

在条件编译块中，代码片段是

if(AccentFormatter.Combination.Values.Contains(keyChar)) {
    SendKeys.Send("\b"+keyText);
    return -1;
}

一旦识别出前一个键入的“`
或
``是一个特定的组合，它就使用一个退格字符来删除它。这里的退格是时间机器


在这个演示之后，我想您将知道如何修改它们以合并到代码中
 键盘记录器。。。我完全同意我的朋友，但这不是你想象中的那种键盘记录器。这实际上是一个学校项目，针对那些在记住用户名/密码方面有问题的人，使用这个工具，他们可以将所有东西都保存在一个安全的地方。是的，键盘记录器和密码没有什么不安全的地方。@syncis:所以现在你可以开始工作了。@KenKin事实上没有，我没有=/非常感谢你提供这些信息，但我有一个问题。还有一种方法与ToAsciii类似，名为ToUnicode，这是不是应该或者我应该尝试mapvirtualkey？@syncis是的，您可能会在
ToUnicode
/
Tounicodex
上有一些运气，但这两种方法仍然存在死键问题。一种可能的解决方法是，如果第一次通过时得到一个死键（返回值为-1），则再次调用它。相关阅读：好的，让我们尝试第一个方法，调用它们两次，我首先用ToAscii调用它，如果它返回-1，我会再次调用它，对吗？现在试着这样做，我没有得到双打，但我没有得到a，我只是得到了a，而不是a。也许MapVirtualKeyx解决了这个问题？
ToUnicode
将解决这个问题。您的
ToAscii
问题仍然是
a
不是ASCII字符。您的代码仍然不检查返回值，它只是盲目地调用函数两次。我强烈建议阅读链接文档。+1感谢分享。我做了一系列的研究，发现很多人都被困在了这个问题上。Í无法让它发挥作用，仍然在没有答案的情况下得到a。我做错了什么，我使用的正是你提到的项目，并将两个项目升级到4.0，但它们仍然不起作用。是的，我想我现在知道你的想法了，非常好，我的朋友，非常好！我想实际上我可以通过我的应用程序实现这一点