void TransparentBlt2( HDC hdcDest,      // 目标DC
     int nXOriginDest,   // 目标X偏移
     int nYOriginDest,   // 目标Y偏移
     int nWidthDest,     // 目标宽度
     int nHeightDest,    // 目标高度
     HDC hdcSrc,         // 源DC
     int nXOriginSrc,    // 源X起点
     int nYOriginSrc,    // 源Y起点
     int nWidthSrc,      // 源宽度
     int nHeightSrc,     // 源高度
     UINT crTransparent  // 透明色,COLORREF类型
     )
{HBITMAP hOldImageBMP, hImageBMP = CreateCompatibleBitmap(hdcDest, nWidthDest, nHeightDest); // 创建兼容位图
 HBITMAP hOldMaskBMP, hMaskBMP = CreateBitmap(nWidthDest, nHeightDest, 1, 1, NULL);   // 创建单色掩码位图
 HDC  hImageDC = CreateCompatibleDC(hdcDest);HDC  hMaskDC = CreateCompatibleDC(hdcDest);hOldImageBMP = (HBITMAP)SelectObject(hImageDC, hImageBMP);hOldMaskBMP = (HBITMAP)SelectObject(hMaskDC, hMaskBMP);// 将源DC中的位图拷贝到临时DC中
 if (nWidthDest == nWidthSrc && nHeightDest == nHeightSrc)BitBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY);elseStretchBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hdcSrc, nXOriginSrc, nYOriginSrc, nWidthSrc, nHeightSrc, SRCCOPY);// 设置透明色
 SetBkColor(hImageDC, crTransparent);// 生成透明区域为白色，其它区域为黑色的掩码位图
 BitBlt(hMaskDC, 0, 0, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCCOPY);// 生成透明区域为黑色，其它区域保持不变的位图
 SetBkColor(hImageDC, RGB(0,0,0));SetTextColor(hImageDC, RGB(255,255,255));BitBlt(hImageDC, 0, 0, nWidthDest, nHeightDest, hMaskDC, 0, 0, SRCAND);// 透明部分保持屏幕不变，其它部分变成黑色
 SetBkColor(hdcDest,RGB(255,255,255));SetTextColor(hdcDest,RGB(0,0,0));BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hMaskDC, 0, 0, SRCAND);// "或"运算,生成最终效果
 BitBlt(hdcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest, hImageDC, 0, 0, SRCPAINT);// 清理、恢复
 SelectObject(hImageDC, hOldImageBMP);DeleteDC(hImageDC);SelectObject(hMaskDC, hOldMaskBMP);DeleteDC(hMaskDC);DeleteObject(hImageBMP);DeleteObject(hMaskBMP);
}

bool TransparentBltU(HDC dcDest,         // handle to Dest DC
     int nXOriginDest,   // x-coord of destination upper-left corner
     int nYOriginDest,   // y-coord of destination upper-left corner
     int nWidthDest,     // width of destination rectangle
     int nHeightDest,    // height of destination rectangle
     HDC dcSrc,          // handle to source DC
     int nXOriginSrc,    // x-coord of source upper-left corner
     int nYOriginSrc,    // y-coord of source upper-left corner
     int nWidthSrc,      // width of source rectangle
     int nHeightSrc,     // height of source rectangle
     UINT crTransparent  // color to make transparent
  )
{if (nWidthDest < 1) return false;if (nWidthSrc < 1) return false;if (nHeightDest < 1) return false;if (nHeightSrc < 1) return false;HDC dc = CreateCompatibleDC(NULL);HBITMAP bitmap = CreateBitmap(nWidthSrc, nHeightSrc, 1, GetDeviceCaps(dc,BITSPIXEL), NULL);if (bitmap == NULL){DeleteDC(dc);    return false;}HBITMAP oldBitmap = (HBITMAP)SelectObject(dc, bitmap);if (!BitBlt(dc, 0, 0, nWidthSrc, nHeightSrc, dcSrc, nXOriginSrc,nYOriginSrc, SRCCOPY)){SelectObject(dc, oldBitmap); DeleteObject(bitmap);        DeleteDC(dc);                return false;}HDC maskDC = CreateCompatibleDC(NULL);HBITMAP maskBitmap = CreateBitmap(nWidthSrc, nHeightSrc, 1, 1, NULL);if (maskBitmap == NULL){SelectObject(dc, oldBitmap); DeleteObject(bitmap);        DeleteDC(dc);                DeleteDC(maskDC);            return false;}HBITMAP oldMask =  (HBITMAP)SelectObject(maskDC, maskBitmap);SetBkColor(maskDC, RGB(0,0,0));SetTextColor(maskDC, RGB(255,255,255));if (!BitBlt(maskDC, 0,0,nWidthSrc,nHeightSrc,NULL,0,0,BLACKNESS)){SelectObject(maskDC, oldMask); DeleteObject(maskBitmap);      DeleteDC(maskDC);              SelectObject(dc, oldBitmap);   DeleteObject(bitmap);          DeleteDC(dc);                  return false;}SetBkColor(dc, crTransparent);BitBlt(maskDC, 0,0,nWidthSrc,nHeightSrc,dc,0,0,SRCINVERT);SetBkColor(dc, RGB(0,0,0));SetTextColor(dc, RGB(255,255,255));BitBlt(dc, 0,0,nWidthSrc,nHeightSrc,maskDC,0,0,SRCAND);HDC newMaskDC = CreateCompatibleDC(NULL);HBITMAP newMask;newMask = CreateBitmap(nWidthDest, nHeightDest, 1,GetDeviceCaps(newMaskDC, BITSPIXEL), NULL);if (newMask == NULL){SelectObject(dc, oldBitmap);DeleteDC(dc);SelectObject(maskDC, oldMask);DeleteDC(maskDC);DeleteDC(newMaskDC);DeleteObject(bitmap);     DeleteObject(maskBitmap); return false;}SetStretchBltMode(newMaskDC, COLORONCOLOR);HBITMAP oldNewMask = (HBITMAP) SelectObject(newMaskDC, newMask);StretchBlt(newMaskDC, 0, 0, nWidthDest, nHeightDest, maskDC, 0, 0,nWidthSrc, nHeightSrc, SRCCOPY);SelectObject(maskDC, oldMask);DeleteDC(maskDC);DeleteObject(maskBitmap); HDC newImageDC = CreateCompatibleDC(NULL);HBITMAP newImage = CreateBitmap(nWidthDest, nHeightDest, 1,GetDeviceCaps(newMaskDC, BITSPIXEL), NULL);if (newImage == NULL){SelectObject(dc, oldBitmap);DeleteDC(dc);DeleteDC(newMaskDC);DeleteObject(bitmap);     return false;}HBITMAP oldNewImage = (HBITMAP)SelectObject(newImageDC, newImage);StretchBlt(newImageDC, 0, 0, nWidthDest, nHeightDest, dc, 0, 0, nWidthSrc,nHeightSrc, SRCCOPY);SelectObject(dc, oldBitmap);DeleteDC(dc);DeleteObject(bitmap);     BitBlt( dcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest,newMaskDC, 0, 0, SRCAND);BitBlt( dcDest, nXOriginDest, nYOriginDest, nWidthDest, nHeightDest,newImageDC, 0, 0, SRCPAINT);SelectObject(newImageDC, oldNewImage);DeleteDC(newImageDC);SelectObject(newMaskDC, oldNewMask);DeleteDC(newMaskDC);DeleteObject(newImage);   DeleteObject(newMask);    return true;
}