C# C结构，并在C中使用C dll#

各位，我是C#的新手，在C#中使用“C”dll有问题，下面是C端代码，工作正常

// myCode.h
typedef struct _SubABC
{
    unsigned short  WordCount;                                     
    unsigned char  *WordData;
    unsigned char   SpeedUp;
} SubABC;

typedef struct _ABC
{
    unsigned char   SubFontNum;
    SubABC subABC[5]; 
} ABC

extern __declspec(dllimport) int __stdcall MY_SetSth(unsigned char SerialNum, ABC *pABC);


//myCode.c
ABC myFun = { '\0' };
unsigned char text_c[] =
{
    0x00,0x27,0xff,0xA5,0xC3, 0x00,0x27,0xff,0xA6,0x26, 0x00,0x23,0xff,0xA7,0xAE, 0x00,0x27,0xff,0xBA,0x7E,
    0x00,0x27,0xff,0xC1,0x52, 0x00,0x27,0xff,0xAC,0xF9, 0x00,0x27,0xff,0x20,0x00,0x27,0xff,0x31, 0x00,0x27,0xff,0x20, 0x00,0x27,0xff,0xA4,0xC0, 0x00,0x27,0xff,0xC4,0xC1,

};
myFun.SubFontNum = 1;
myFun.subMABC[0].WordCount = sizeof(text_c);
myFun.subMABC[0].WordData = text_c;
myFun.subMABC[0].SpeedUp = 0;
int retvalue = MY_SetSth(1, &myFun);

下面是我的C代码

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct SubABC
{
    public ushort WordCount;
    [MarshalAs(UnmanagedType.LPArray)]
    public byte[] WordData;
    public byte SpeedUp;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct ABC
{
    public byte   SubFontNum;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
    public SubABC[] subABC;
}

[DllImport("myDLL.dll", CharSet = CharSet.Ansi)]
public extern static int MY_SetSth(byte SerialNum, ref ABC pABC);


ABC myFun = new ABC();
ABC.subABC = new SubABC[5];
unsigned char text_c[] =
{
    0x00,0x27,0xff,0xA5,0xC3, 0x00,0x27,0xff,0xA6,0x26, 0x00,0x23,0xff,0xA7,0xAE, 0x00,0x27,0xff,0xBA,0x7E,
    0x00,0x27,0xff,0xC1,0x52, 0x00,0x27,0xff,0xAC,0xF9, 0x00,0x27,0xff,0x20,0x00,0x27,0xff,0x31, 0x00,0x27,0xff,0x20, 0x00,0x27,0xff,0xA4,0xC0, 0x00,0x27,0xff,0xC4,0xC1,

};
myFun.SubFontNum = 1;
myFun.subMABC[0].WordCount = (ushort)text_c.Length;
myFun.subMABC[0].WordData = text_c;
myFun.subMABC[0].SpeedUp = 0;
int retvalue = MY_SetSth(1, ref myFun);

我始终获得

TypeLoadException:无法封送类型为“subABC”的字段“WordData”：无效的托管/非托管类型组合（数组字段必须与ByValArray或SafeArray配对）

，因为WordData的大小未知，我无法使用ByValArray，和SafeArray get

AccessViolationException:尝试读取或写入受保护内存

我试着像下面这样使用IntPtr

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct SubABC
{
    public ushort WordCount;
    public IntPtr WordData;
    public byte SpeedUp;
}
ABC.subABC[0].WordData = Marshal.AllocHGlobal(text_c.Length); ;
Marshal.Copy(text_c, 0, ABC.subABC[0].WordData, text_c.Length);
int retvalue = MY_SetSth(1, ref myFun);

我收到错误消息
AccessViolationException:试图读取或写入受保护内存
有人能帮我吗？非常感谢。
您能分享错误详细信息吗？您可以将
WordData
定义为
IntPtr
，然后将其封送至所需类型请查看此MSDN我想，您应该使用
marshal.allocTaskMem
方法，而不是
marshal.AllocHGlobal
看起来没问题。很难猜测“我的设置”是如何变成“我的设置”的。您必须在C端对此进行调试。嗨，Pavel，我尝试使用
Marshal.allocTaskMem
，但仍然得到
AccessViolationException:尝试读取或写入受保护的内存
。嗨，汉斯，对不起，这是一个打字错误，应该是我的设置。你能分享错误的详细信息吗？您可以将
WordData
定义为
IntPtr
，然后将其封送至所需类型请查看此MSDN我想，您应该使用
marshal.allocTaskMem
方法，而不是
marshal.AllocHGlobal
看起来没问题。很难猜测“我的设置”是如何变成“我的设置”的。您必须在C端对此进行调试。嗨，Pavel，我尝试使用
Marshal.allocTaskMem
，但仍然得到
AccessViolationException:尝试读取或写入受保护的内存
。嗨，汉斯，对不起，是打字错误，应该是我的错。