正确的，应该怎么写？
CBitmap bmp1, bmp2;
bmp1.LoadBitmap(IDB_XRX);
bmp2.LoadBitmap(IDB_TL);
CDC *pDC =GetDC(),
*pDdc=new CDC,
*pSdc=new CDC;
pSdc->CreateCompatibleDC(pDC);
pDdc->CreateCompatibleDC(pDC);
pDdc->SelectObject(&bmp1);
pSdc->SelectObject(&bmp2);
BLENDFUNCTION b;
ZeroMemory(&b, sizeof(BLENDFUNCTION));
b.BlendOp=AC_SRC_OVER;
b.BlendFlags=0;
// b.SourceConstantAlpha=AC_SRC_ALPHA;
/*
for(int n=0; n<256; n++)
{
b.AlphaFormat=n;
AlphaBlend(*pDdc,0,0,292,300, *pSdc,0,0,163,180,b); Sleep(100);
}
*/
b.AlphaFormat=125;
if(AlphaBlend(*pDdc,0,0,292,300, *pSdc,0,0,163,180,b)==FALSE)
MessageBox("Error1~");
if(GetLastError()==ERROR_INVALID_PARAMETER)
MessageBox("Error2~");
pDC->BitBlt(0,0,292,300, pDdc,0,0,SRCCOPY);
ReleaseDC(pDC);
delete pSdc;
delete pDdc;
