Question

我使用Target Machine 64位在VS2013 .Net 4中重新编译了现有的VC ++代码。编译很好，但由于某种原因，SetDIBits无法正常工作。图像黑了。这些是单色图像。 VS2008 .Net 2.0 32位编译使用相同的精确代码。任何想法都会有所帮助。

示例代码如下（此函数获取IntPtr句柄，然后用于其他绘图）：

IntPtr GetGraphics(Bitmap ^src, BitmapData ^pData, IntPtr ^phBitmapOldIntPtr) {

    HDC hdc;
    IntPtr scan0;
    BitmapData ^data;
    System::Drawing::Rectangle rectSrc = System::Drawing::Rectangle(0, 0, src->Width, src->Height);

    BYTE *pBits;
    IntPtr pixels, hBitmapIntPtr, hdcIntPtr;
    BITMAPINFO *pbmi;
    int iScanLines;
    int iCopied;
    HBITMAP hBitmapSrc, hBitmapOld;

    hdc = CreateCompatibleDC(NULL);

        hBitmapSrc = CreateCompatibleBitmap(hdc, src->Width, src->Height);
        data = src->LockBits(rectSrc, ImageLockMode::ReadWrite, src->PixelFormat);
        pixels = data->Scan0;
        pBits = (BYTE*)pixels.ToPointer();
        //ZeroMemory(&pbmi, sizeof(BITMAPINFO));
        pbmi = (BITMAPINFO*)GlobalAlloc(GMEM_FIXED, sizeof(BITMAPINFO) + 2 * sizeof(RGBQUAD));
        pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
        pbmi->bmiHeader.biBitCount = 1;
        pbmi->bmiHeader.biHeight = -src->Height;
        pbmi->bmiHeader.biWidth = src->Width;
        pbmi->bmiHeader.biPlanes = 1;
        pbmi->bmiHeader.biCompression = BI_RGB;
        pbmi->bmiHeader.biSizeImage = 0;
        pbmi->bmiHeader.biXPelsPerMeter = 300;
        pbmi->bmiHeader.biYPelsPerMeter = 300;
        pbmi->bmiHeader.biClrUsed = 0;
        pbmi->bmiHeader.biClrImportant = 0;
        pbmi->bmiColors[0].rgbBlue = 0;
        pbmi->bmiColors[0].rgbGreen = 0;
        pbmi->bmiColors[0].rgbRed = 0;
        pbmi->bmiColors[1].rgbBlue = 255;
        pbmi->bmiColors[1].rgbGreen = 255;
        pbmi->bmiColors[1].rgbRed = 255;
        iScanLines = src->Height;
        iCopied = SetDIBits(hdc, hBitmapSrc, 0, iScanLines, pBits, pbmi, DIB_RGB_COLORS);
        GlobalFree(pbmi);
        if (pData) pData = data;

    hBitmapOld = (HBITMAP)SelectObject(hdc, hBitmapSrc);
    phBitmapOldIntPtr = IntPtr(hBitmapOld);
    hdcIntPtr = IntPtr((void*)hdc); 
    return hdcIntPtr;
 }

提前致谢！

Answer 1

整个功能可以替换为：

src->Clone()将位图复制到兼容的位图
Graphics::FromImage()使图形与克隆
GetHdc()，以获得现有绘图功能的HDC

VC ++ 64位SetDIBits不起作用

1 个答案: