这段代码为什么把位图在内存缩放后只能2色显示?

[pest007]

这段代码为什么把位图在内存缩放后只能2色显示?
void StrectBMP(char * fileSrc,HDC ClientDc,double proportion)
{
BITMAP srcInfo;
HBITMAP HBmpSource=(HBITMAP)LoadImage(0,fileSrc,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

HDC hsrc=CreateCompatibleDC(NULL);
HGDIOBJ hold=SelectObject(hsrc,HBmpSource);
GetObject(HBmpSource,sizeof(BITMAP),(LPVOID)&srcInfo);

HDC hDest=CreateCompatibleDC(NULL);
int mode=SetStretchBltMode(hDest,COLORONCOLOR);
// SelectStockObject(hDest,BLACK_BRUSH);
HBITMAP hmemBmp=CreateCompatibleBitmap(hDest,srcInfo.bmWidth,
srcInfo.bmHeight);
HGDIOBJ holdsrc=SelectObject(hDest,hmemBmp);

BOOL b=StretchBlt(hDest,0,0,srcInfo.bmWidth,srcInfo.bmHeight,hsrc,0,0,
srcInfo.bmWidth,srcInfo.bmHeight,SRCCOPY);

b= BitBlt(ClientDc,0,0,srcInfo.bmWidth,srcInfo.bmHeight,hDest,0,0,SRCCOPY);
}

[YouTuBe]

Up

[pest007]

ClientDc=GetDC(hWnd);//窗口显示区HDC
fileSrc为位图文件路径.
各位大大帮忙呀,分不够可一再给,在线等.

[qunta]

改成
HBITMAP hmemBmp=CreateCompatibleBitmap(ClientDC,srcInfo.bmWidth,
srcInfo.bmHeight);

[pest007]

谢谢qunta(J2Y2) ,马上给分.当我的目的是想在内存中先把位图缩小后取位图数据,BitBlt只是想看到内存作图的实际效果.不知道可以在以上代码基础上实现吗?

[pest007]

问题已解决.谢谢各位.