<<<<<为什么画出来的没有颜色呢?谢谢>>>>>
void CTemp1Dlg::OnOK()
{
HDC hdcMem;
HBITMAP hBitmap;
hdcMem=CreateCompatibleDC(NULL);
hBitmap = CreateDiscardableBitmap(hdcMem, 500,500);
(HBITMAP)SelectObject(hdcMem,hBitmap);
CBrush brush;
HGDIOBJ pBrush;
brush.CreateSolidBrush(0x0000ff);
pBrush=::SelectObject(hdcMem,brush);
::Rectangle(hdcMem,20,20,180,180);
::MoveToEx(hdcMem,1,1,NULL);
::LineTo(hdcMem,100,100);
::SelectObject(hdcMem,pBrush);
HDC hdc=::GetDC(this->m_hWnd);
::BitBlt(hdc,0,0,500,500,hdcMem,0,0,SRCCOPY);
::ReleaseDC(this->m_hWnd,hdc);
}
为什么画出来的没有颜色呢?谢谢