Question

我有一个名为WD_SDK.dll的DLL文件（它带有SDK.h文件）。

我打开SDK.h，我看到了：

typedef void (CALLBACK * VideoCaptureCB_Ptr)(PVOID pContext, BYTE * apData[3],
VideoSampleInfo_T * pVSI);

typedef struct _VideoSampleInfo_T
{
    ULONG   idFormat; // 
    ULONG   lSignalState;
    int     nLen; // not used for raw video data(e.g. YUV420)
    int     nWidth;
    int     nHeight;
    int     anPitchs[3]; // only used for raw video data(e.g. YUV420)
    ULONG   dwMicrosecsPerFrame; // 1000*1000/FPS
    ULONG   field;
    int     iSerial;

} VideoSampleInfo_T;

WD_RegisterVideoPreviewCB(HANDLE hChannel, PVOID pContext, VideoCaptureCB_Ptr pCB);

我想在C＃中调用WD_RegisterVideoPreviewCB。所以我使用DllImport在C＃中声明它。它看起来像这样：

[DllImport("WD_SDK.dll", EntryPoint = "_WD_RegisterVideoPreviewCB@12", ExactSpelling = true)]
        static extern int WD_RegisterVideoPreviewCB(IntPtr hChannel,  object pContext, VideoCaptureCB_Ptr pCB);

然后我在C＃中重新声明C ++结构和CALLBACK，如下所示：

public delegate void VideoCaptureCB_Ptr(IntPtr pContext, byte[] apData, VideoSampleInfo_T pVSI);

[StructLayout(LayoutKind.Sequential)]
public struct VideoSampleInfo_T
{
    public uint idFormat;
    public uint lSignalState;
    public int nLen; // not used for raw video data(e.g. YUV420)
    public int nWidth;
    public int nHeight;
    public int[] anPitchs; // only used for raw video data(e.g. YUV420)
    public uint dwMicrosecsPerFrame; // 1000*1000/FPS
    public uint field;
    public int iSerial;

}

一个代表工具

public static void HandleVideoStatic(IntPtr pContext, byte[] apData, VideoSampleInfo_T pVSI)
{
}

当我运行我的代码时：

WD_RegisterVideoPreviewCB(m_ahChannels[i],  m_aMediaHandler[i], HandleVideoStatic);

程序显示错误does not match the unmanaged target signature.

我认为PVOID pContext遇到了问题，我将其更改为对象pContext。但是我必须将m_aMediaHandler[i]（它是一个类的实例而不是指针）传递给它，引发错误＆＃34; ..＆＃34;无效的agruments＆＃34;

P / S：C ++中的WD_RegisterVideoPreviewCB调用

WD_RegisterVideoPreviewCB(m_ahChannels[i], &m_aMediaHandler[i], HandleVideoStatic);

DllImport签名错误

0 个答案: