有问题...关于贴图遮盖

[chemo]

以下是一段实现透明贴图的代码,好象有问题,请高手改正
// 创建单色掩码位图
hMaskBitmap = CreateBitmap(nWidth, nHeight, 1, 1, NULL);
SelectObject(hMaskDC, hMaskBitmap);
BitBlt(hMaskDC, 0, 0, nWidth, nHeight, hMemDC, 0, 0, SRCCOPY);
SetBkColor(hMaskDC, RGB(255, 255, 255));
SetTextColor(hMaskDC, RGB(0, 0, 0));

// 前景图背景置黑
SetBkColor(hMemDC, RGB(0, 0, 0));
SetTextColor(hMemDC, RGB(255, 255, 255));
BitBlt(hMemDC, 0, 0, nWidth, nHeight, hMaskDC, 0, 0, SRCAND);

// 贴上前景图
SetBkColor(hdc, RGB(255, 255, 255));
SetTextColor(hdc, RGB(0, 0, 0));
BitBlt(hdc, x, y, nWidth, nHeight, hMaskDC, 0, 0, SRCAND);
BitBlt(hdc, x, y, nWidth, nHeight, hMemDC, 0, 0, SRCPAINT);

[lanstar200]

代碼太少了，看不出來

[lambochan]

hMaskBitmap = CreateBitmap(nWidth, nHeight, 1, 1, NULL);
HBITMAP hOld = (HBITMAP)SelectObject(hMaskDC,hMaskBitmap);
//制造mask,RGB为需要滤掉的背景色，这里是白色，实际颜色自己设置
SetBKColor(hMemDC,RGB(255,255,255));
BitBlt(hMaskDC,0,0,nWidth,nHeight,hMemDC,0,0,SRCCOPY);
//透明显示
BitBlt(hdc,0,0,nWidth,nHeight,hMemDC,0,0,SRCINVERT);
BitBlt(hdc,0,0,nWidth,nHeight,hMaskDC,0,0,SRCAND);
BitBlt(hdc,0,0,nWidth,nHeight,hMemDC,0,0,SRCINVERT);

[菜牛]

透明贴图是这样做的吗？要自己做个黑色背景的图片来的。
或者，用TransparentBlt()就可以了。