C# DPI-aware和Rect

我有个小问题，似乎找不到答案。我有一个应用程序，它可以获得特定的进程和窗口大小。唯一的问题是它占用了实际屏幕大小（用户看到的）的一个百分比

我想做一个应用程序的屏幕截图，但是如果我使用窗口的矩形，我会得到一个比它更小的屏幕，因为分辨率是125%。这意味着我输出的原始分辨率（

1280*800

）比我的屏幕分辨率（

1600*1000

）小。您可以理解，这个小问题使我的程序不可靠。我的问题是如何解决这个问题

我已经创建了一个清单，我将

DPIAware

设置为true。我还在调试中禁用了VisualStudio宿主。但这没用。我仍然得到相同的值和相同的问题。下面是我实际截屏的代码片段：

RECT Rect = new RECT();
System.Diagnostics.Process[] p = System.Diagnostics.Process.GetProcessesByName("Process");
ShowWindow(p[0].MainWindowHandle, 9);
SetForegroundWindow(p[0].MainWindowHandle);

if (GetWindowRect(p[0].MainWindowHandle, ref Rect))
{
    var bmp = new Bitmap(Rect.Width, Rect.Height);
    var graphics = Graphics.FromImage(bmp);
    graphics.CopyFromScreen(Rect.Left, Rect.Top, 0, 0, new Size(Rect.Width, Rect.Height), CopyPixelOperation.SourceCopy);
    bmp.Save(@"C:\Screenshots\temp1.png");
}

这给了我一个

1280*800

的屏幕截图，不足以涵盖整个过程，即

1600*1000

。因为屏幕坐标不正确，所以一切都关闭了。如果我把所有的数乘以1,25就可以了，但这不是一个解决方案，因为我不知道其他PC上的DPI设置是什么

编辑3： 我将发布包含RECT的完整代码

RECT Rect = new RECT();
System.Diagnostics.Process[] p = System.Diagnostics.Process.GetProcessesByName("LoLPatcherUx");
ShowWindow(p[0].MainWindowHandle, 9);
SetForegroundWindow(p[0].MainWindowHandle);

if (GetWindowRect(p[0].MainWindowHandle, ref Rect))
{
    int processH = Rect.Bottom - Rect.Top;
    int processW = Rect.Right - Rect.Left;

    float processWidth;
    float processHeight;                            

    SizeF dpi = GetCurrentDpi();
    // Calc the scale.
    SizeF scale = new SizeF()
    {
        Width = dpi.Width / 96f,
        Height = dpi.Height / 96f                                  
    };

    // Scale the rectangle.
    processWidth = Rect.Width * scale.Width;
    processHeight = Rect.Height * scale.Height;

    var bmp = new Bitmap(lolPatcherBreedte, lolPatcherHoogte);
    Graphics graphics = Graphics.FromImage(bmp);
    graphics.CopyFromScreen(Rect.Left, Rect.Top, 0, 0, new Size(processW, processH));

    bmp.Save(@"C:\Screenshots\temp1.png");
}

public struct RECT
{
    private int _Left;
    private int _Top;
    private int _Right;
    private int _Bottom;

    public RECT(RECT Rectangle)
        : this(Rectangle.Left, Rectangle.Top, Rectangle.Right, Rectangle.Bottom) { }

    public RECT(int Left, int Top, int Right, int Bottom)
    {
        _Left = Left;
        _Top = Top;
        _Right = Right;
        _Bottom = Bottom;
    }

    public int X
    {
        get { return _Left; }
        set { _Left = value; }
    }

    public int Y
    {
        get { return _Top; }
        set { _Top = value; }
    }

    public int Left
    {
        get { return _Left; }
        set { _Left = value; }
    }

    public int Top
    {
        get { return _Top; }
        set { _Top = value; }
    }

    public int Right
    {
        get { return _Right; }
        set { _Right = value; }
    }

    public int Bottom
    {
        get { return _Bottom; }
        set { _Bottom = value; }
    }

    public int Height
    {
        get { return _Bottom - _Top; }
        set { _Bottom = value + _Top; }
    }

    public int Width
    {
        get { return _Right - _Left; }
        set { _Right = value + _Left; }
    }

    public Point Location
    {
        get { return new Point(Left, Top); }
        set
        {
            _Left = value.X;
            _Top = value.Y;
        }
    }

    public Size Size
    {
        get { return new Size(Width, Height); }
        set
        {
            _Right = value.Width + _Left;
            _Bottom = value.Height + _Top;
        }
    }

    public static implicit operator Rectangle(RECT Rectangle)
    {
        return new Rectangle(Rectangle.Left, Rectangle.Top, Rectangle.Width, Rectangle.Height);
    }

    public static implicit operator RECT(Rectangle Rectangle)
    {
        return new RECT(Rectangle.Left, Rectangle.Top, Rectangle.Right, Rectangle.Bottom);
    }

    public static bool operator ==(RECT Rectangle1, RECT Rectangle2)
    {
        return Rectangle1.Equals(Rectangle2);
    }

    public static bool operator !=(RECT Rectangle1, RECT Rectangle2)
    {
        return !Rectangle1.Equals(Rectangle2);
    }

    public override string ToString()
    {
        return "{Left: " + _Left + "; " + "Top: " + _Top + "; Right: " + _Right + "; Bottom: " + _Bottom + "}";
    }

    public override int GetHashCode()
    {
        return ToString().GetHashCode();
    }

    public bool Equals(RECT Rectangle)
    {
        return Rectangle.Left == _Left && Rectangle.Top == _Top && Rectangle.Right == _Right && Rectangle.Bottom == _Bottom;
    }

    public override bool Equals(object Object)
    {
        if (Object is RECT)
        {
            return Equals((RECT)Object);
        }
        else if (Object is Rectangle)
        {
            return Equals(new RECT((Rectangle)Object));
        }

        return false;
    }
}

---

您可以通过获取当前的DPI设置

• 及

财产

通过这种方式，您应该能够正确地计算它（这是我在我的一个项目中如何做到的）

只需创建一个虚拟的

表单

和一个

图形

对象（如果您的代码是在表单上下文之外执行的），即可获得这些信息：

---

用法：

if (GetWindowRect(p[0].MainWindowHandle, ref Rect))
{
    var bmp = new Bitmap(Rect.Width, Rect.Height);
    Graphics graphics = Graphics.FromImage(bmp);

    // Use the helper function to get the current dpi.
    SizeF dpi = GetCurrentDpi();

    // Calc the scale.
    SizeF scale = new SizeF()
    {
        Width = dpi.Width / 96f,
        Height = dpi.Height / 96f
    };

    // Scale the rectangle.
    Rect.Width *= scale.Width;
    Rect.Height *= scale.Height;

    graphics.CopyFromScreen(Rect.Left, Rect.Top, 0, 0, new Size(Rect.Width, Rect.Height), CopyPixelOperation.SourceCopy);
    bmp.Save(@"C:\Screenshots\temp1.png");
}

演示：

class Program
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool GetWindowRect(IntPtr hwnd, ref RECT lpRect);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool SetForegroundWindow(IntPtr hWnd);

    static void Main(string[] args)
    {

        RECT rect = new RECT();
        Process[] processes = System.Diagnostics.Process.GetProcessesByName("iexplore");
        Process iexplore = processes.First();

        ShowWindow(iexplore.MainWindowHandle, ShowWindowCommands.Restore);
        SetForegroundWindow(iexplore.MainWindowHandle);
        var result = GetWindowRect(iexplore.MainWindowHandle, ref rect);

        RectangleF rectF = new RectangleF()
        {
            Location = new PointF(rect.Left, rect.Top),
            Size = new SizeF(rect.Right - rect.Left + 1, rect.Bottom - rect.Top + 1)
        };            

        var bmp = new Bitmap((int)rectF.Width, (int)rectF.Height);
        Graphics graphics = Graphics.FromImage(bmp);
        graphics.CopyFromScreen((int)rectF.Left, (int)rectF.Top, 0, 0, new Size((int)rectF.Width, (int)rectF.Height), CopyPixelOperation.SourceCopy);
        bmp.Save(@"C:\temp\screenshot1.jpg", ImageFormat.Jpeg);          
    }      
}

enum ShowWindowCommands
{
    Hide = 0,
    Normal = 1,
    ShowMinimized = 2,
    Maximize = 3,
    ShowMaximized = 3,
    ShowNoActivate = 4,
    Show = 5,
    Minimize = 6,
    ShowMinNoActive = 7,
    ShowNA = 8,
    Restore = 9,
    ShowDefault = 10,
    ForceMinimize = 11
}

[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
    public int Left;
    public int Top;
    public int Right;
    public int Bottom;
}

---

这不是dpiAware，除非你达到125%以上，否则它不会生效。这是相当奇怪的，你得到任何东西，这个过程需要时间来开始，创建和油漆它的窗口。ShowWindow（）不足以确保完成此操作。样板文件是使用Process.WaitForInputIdle（），您可能需要使用Thread.Sleep（）更长时间来冷却，因为这个过程行为古怪。我这里的代码只是发布在这里的一个片段。奇怪的是，其他一切都很好，但截屏是我无法得到正确的东西，因为这个奇怪的错误。我将尝试下面发布的解决方案，我希望能解决问题。我还想进一步发表评论。这个过程已经在运行了，如果我在代码中硬编码值（1600*1000），它就像阳光一样工作。这意味着它可以动态完成，对吗？实际上什么是

RECT

，如何包装它？你在哪里设置它的大小？见上面我添加了RECT的代码，这样你就可以更清楚地了解我在做什么。我真的不知道如何在上面的截图中使用它。。您能否详细说明如何在上面的代码段中实现这一点？我更新了示例。您需要输入当前的dpi值。这个小助手功能将为你得到他们。谢谢我要试试这个！所以我试了一下，它给了我96的宽度和高度。这意味着我的DPI为96。但这告诉我什么呢？这如何帮助我获得流程窗口的正确值？抱歉，我问了这些问题，但我有点被困在这里了（顺便问一下，你帮了我大忙，我只想谢谢你！

class Program
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool GetWindowRect(IntPtr hwnd, ref RECT lpRect);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool SetForegroundWindow(IntPtr hWnd);

    static void Main(string[] args)
    {

        RECT rect = new RECT();
        Process[] processes = System.Diagnostics.Process.GetProcessesByName("iexplore");
        Process iexplore = processes.First();

        ShowWindow(iexplore.MainWindowHandle, ShowWindowCommands.Restore);
        SetForegroundWindow(iexplore.MainWindowHandle);
        var result = GetWindowRect(iexplore.MainWindowHandle, ref rect);

        RectangleF rectF = new RectangleF()
        {
            Location = new PointF(rect.Left, rect.Top),
            Size = new SizeF(rect.Right - rect.Left + 1, rect.Bottom - rect.Top + 1)
        };            

        var bmp = new Bitmap((int)rectF.Width, (int)rectF.Height);
        Graphics graphics = Graphics.FromImage(bmp);
        graphics.CopyFromScreen((int)rectF.Left, (int)rectF.Top, 0, 0, new Size((int)rectF.Width, (int)rectF.Height), CopyPixelOperation.SourceCopy);
        bmp.Save(@"C:\temp\screenshot1.jpg", ImageFormat.Jpeg);          
    }      
}

enum ShowWindowCommands
{
    Hide = 0,
    Normal = 1,
    ShowMinimized = 2,
    Maximize = 3,
    ShowMaximized = 3,
    ShowNoActivate = 4,
    Show = 5,
    Minimize = 6,
    ShowMinNoActive = 7,
    ShowNA = 8,
    Restore = 9,
    ShowDefault = 10,
    ForceMinimize = 11
}

[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
    public int Left;
    public int Top;
    public int Right;
    public int Bottom;
}