为什么着一段代码不能在客户区显示一个位图呢

Question

为什么着一段代码不能在客户区显示一个位图呢
就放在VS2003新键的Win32程序的case WM_PAINT:中
    ...
    hMemDC=CreateCompatibleDC(hdc);
    hMemDC2=CreateCompatibleDC(hMemDC);    SelectObject(hMemDC2,hBmp);
    BitBlt(hMemDC,0,0,100,100,hMemDC2,0,0,SRCCOPY);
    BitBlt(hdc,0,0,100,100,hMemDC,0,0,SRCCOPY);
    ...
请大师们指点

Answer 1

//  hMemDC=CreateCompatibleDC(hdc);
    hMemDC2=CreateCompatibleDC(hdc);    SelectObject(hMemDC2,hBmp);
//  BitBlt(hMemDC,0,0,100,100,hMemDC2,0,0,SRCCOPY);
//  BitBlt(hdc,0,0,100,100,hMemDC,0,0,SRCCOPY);
    BitBlt(hdc, 0, 0, 100, 100, hMemDC2, 0, 0, SRCCOPY); //**

Answer 2

hMemDC2=CreateCompatibleDC(hMemDC);
->
hMemDC2=CreateCompatibleDC(hdc);