Question

帮我解析一下VC代码

代码如下：
void InfoNES_LoadFrame()
{
/*
* Transfer the contents of work frame on the screen
*
*/

// Set screen data
memcpy( pScreenMem, WorkFrame, NES_DISP_WIDTH * NES_DISP_HEIGHT * 2 );

// Screen update
HDC hDC = GetDC( hWndMain );

HDC hMemDC = CreateCompatibleDC( hDC );

HBITMAP hOldBmp = (HBITMAP)SelectObject( hMemDC, hScreenBmp );

StretchBlt( hDC, 0, 0, NES_DISP_WIDTH * wScreenMagnification,
NES_DISP_HEIGHT * wScreenMagnification, hMemDC,
0, 0, NES_DISP_WIDTH, NES_DISP_HEIGHT, SRCCOPY );

SelectObject( hMemDC, hOldBmp );

DeleteDC( hMemDC );
ReleaseDC( hWndMain, hDC );
}

Answer 1

创建句柄
创建画刷
应该是双缓冲技术

Answer 2

建议查看msdn

Answer 3

把位图hScreenBmp以指定大小画到hWndMain窗口的客户区或DC上,