VC下截取当前屏幕的函数(Function of copy screen)

MFC中就有截取屏幕的相关函数:
ScrDC.CreateDC(“DISPLAY”, NULL, NULL, NULL);

具体函数如下:

//存储背景图片(成员变量)
CBitmap* m_pBackBitmap;

/*******************************
 * 拷贝屏幕固定区域
 * 参数:
 * xStartPt  - 拷贝屏幕的起始点X坐标
 * yStartPt  - 拷贝屏幕的起始点Y坐标
 * width      - 拷贝宽度
 * height     - 拷贝高度
 * xToCopy  - 拷贝目的地的起始点X坐标
 * yToCopy  - 拷贝目的地的起始点Y坐标
 *******************************/
void CMyFun::CopyScreenToBitmap(xStartPt, yStartPt, width, height, xToCopy, yToCopy)
{
	//NEW资源(调用一次重新拷贝一次)
	if (m_pBackBitmap != NULL)
	{
		delete m_pBackBitmap;
		m_pBackBitmap = NULL;
	}

	m_pBackBitmap = new CBitmap();

	CDC ScrDC,MemDC;

	ScrDC.CreateDC("DISPLAY", NULL, NULL, NULL);
	MemDC.CreateCompatibleDC(&ScrDC);

	m_pBackBitmap->CreateCompatibleBitmap(&ScrDC,width,height);
	MemDC.SelectObject(m_pBackBitmap);

	//开始拷贝
	MemDC.BitBlt(xStartPt, yStartPt, width, height,&ScrDC,xToCopy,yToCopy,SRCCOPY);

	ScrDC.DeleteDC();
	MemDC.DeleteDC();
}

调用函数,实现截取全屏:

//取的屏幕分辨率
int width = ::GetSystemMetrics(SM_CXSCREEN);
int height = ::GetSystemMetrics(SM_CYSCREEN);

this->CopyScreenToBitmap(0,0,width,height,0,0);

//这时m_pBackBitmap指向的CBitmap对象就存着全屏的图象了