c# - 将指针从 C# 传递到 C++

Question

我正在尝试将 2D 掩码(全为 0，期望感兴趣区域为 1)从 C#(作为 short[])传递给 C++(作为 unsigned short*)，但我无法在 C++ 中获得正确的值.

C#

[DllImport("StatsManager.dll", EntryPoint = "SetStatsMask")]
private static extern int SetStatsMask(IntPtr mask, int imgWidth, int imgHeight);

short[] mask;
mask = new short[8*8];
// some operation here making a ROI in mask all 1.  ex 0000111100000000 in 1D 
IntPtr maskPtr = Marshal.AllocHGlobal(2 * mask.Length);
Marshal.Copy(mask, 0, maskPtr, mask.Length);
SetStatsMask(maskPtr, width, height);

C++

long StatsManager::SetStatsMask(unsigned short *mask, long width, long height)
{
    //create memory to store the incoming mask
    //memcpy the mask to the new buffer 
    //pMask = realloc(pMask,width*height*sizeof(unsigned short));

    long ret = TRUE;

    if (NULL == _pMask)
    {
        _pMask = new unsigned short[width * height];
    }
    else
    {
        realloc(_pMask,width*height*sizeof(unsigned short));
    }

    memcpy(mask,_pMask,width*height*sizeof(unsigned short));

    SaveBuffer(_pMask,  width,  height);

    return ret;
}

但是我在 C++ 中使用监 window 口只能看到 52536 而不是 0000111100000000，所以我想知道我在哪里搞砸了？任何人都可以帮忙吗？谢谢。

Answer 1

我相信你放错了 memcpy 的参数:

memcpy(mask,_pMask,width*height*sizeof(unsigned short));

据我了解，您想从 mask 复制到 _pMask，因此您应该这样写:

memcpy(_pMask, mask, width*height*sizeof(unsigned short));