GDI BitBlt 问题

 hDc = BeginPaint(hWnd,&ps);
         //iCurRow = 0;
         //DrawTextA(hDc,aszScrollPosMsg,-1,&reClient,SND_FILENAME|SND_ASYNC);
         h_dc = CreateCompatibleDC(hDc);
         holdBmp = (HBITMAP)SelectObject(h_dc,hBit);
         GetObject(hBit,sizeof(BITMAP),&bitmap);
         BitBlt(hDc,0,0,bitmap.bmWidth,bitmap.bmHeight,h_dc,0,0,SRCCOPY);
         DeleteObject(holdBmp); 
         DeleteDC(h_dc); //如果此时不删除自己创建的内存中的DC，那么下次无法绘制。因为创建的和当前DC兼容的内存中DC没有释放
         EndPaint(hWnd,&ps);
         break;