HDC dc;
bmp HBITMAP; dc = CreateCompatibleDC(Canvas.Handle);
bmp=CreateCompatibleBitmap(dc,100,100);//add
SelectObject(dc,bmp);//add
TextOut(dc,0,0,"as",strlen("as"));
BitBlt(GetDC(0), 0, 0, 300,800,dc, 0, 0, SRCCOPY);
DeleteDC(a);
DeleteObject(b);//add
为什么用内存DC画出来的图的背景是黑的呢?
请尽量用API来回答这个问题,不要用MFC,因为我是个Delphi用户,在Delphi版没人解决这个问题,只能到这里来提问了。谢谢!
HDC dc;
bmp HBITMAP; dc = CreateCompatibleDC(Canvas.Handle);
bmp=CreateCompatibleBitmap(dc,100,100);//add
SelectObject(dc,bmp);//add
SetBkColor(dc, RGB(255,0,0));
TextOut(dc,0,0,"as",strlen("as"));
BitBlt(GetDC(0), 0, 0, 300,800,dc, 0, 0, SRCCOPY);
DeleteDC(a);
DeleteObject(b);//add
还是不行呀,麻烦大家了。
FillRect刷一下,谢谢