我想在桌面上画画,可是为什么运行后没反应?????

[水电费123343]

程序如下:

CWnd* pWnd=CWnd::GetDesktopWindow();
CDC* dc=pWnd->GetDC();
pWnd->Invalidate();
pWnd->UpdateWindow();
dc->SelectStockObject(BLACK_BRUSH);
dc->Rectangle(0,0,300,300);
pWnd->ReleaseDC(dc);

[knight_z]

你的代码根本不对呀！

[akiko]

把 CDC* dc=pWnd->GetDC();
改成 CDC* dc=pWnd->GetWindowDC();

[水电费123343]

akiko(弥弥)　:
thanks