c++截取屏幕图片并保存(函数代码实现)

傷城~ 2022-08-27 11:51 166阅读 0赞

<strong>	//获取桌面窗口的CDC
    	CDC *pdeskdc = GetDesktopWindow()->GetDC();  
    	CRect re;
    	//获取窗口的大小
    	GetDesktopWindow()->GetClientRect(&re);
    	CBitmap bmp;
    	bmp.CreateCompatibleBitmap(pdeskdc , re.Width() , re.Height());
    	//创建一个兼容的内存画板
    	CDC memorydc;
    	memorydc.CreateCompatibleDC(pdeskdc);
    
    	//选中画笔
    	CBitmap *pold = memorydc.SelectObject(&bmp);
    
    	//绘制图像
    	memorydc.BitBlt(0,0,re.Width() ,re.Height(), pdeskdc , 0 ,0 ,SRCCOPY) ;
    
    	//获取鼠标位置，然后添加鼠标图像
    	CPoint po;
    	GetCursorPos(&po);
    	HICON hinco = (HICON)GetCursor();
    	memorydc.DrawIcon(po.x-10 , po.y - 10 , hinco);
    	//选中原来的画笔
    	memorydc.SelectObject(pold);
    	BITMAP bit;
    	bmp.GetBitmap(&bit);
    //	DWORD size = bit.bmWidth * bit.bmHeight ;
    
    	//定义 图像大小（单位：byte）
    	DWORD size = bit.bmWidthBytes * bit.bmHeight ;
    	LPSTR lpdata = (LPSTR)GlobalAlloc(GPTR , size) ;
    
    	//后面是创建一个bmp文件的必须文件头，想要了解可以参考msdn
    	
    	BITMAPINFOHEADER pbitinfo;
    	pbitinfo.biBitCount = 24 ; 
    	pbitinfo.biClrImportant = 0;
    	pbitinfo.biCompression = BI_RGB ;
    	pbitinfo.biHeight = bit.bmHeight ; 
    	pbitinfo.biPlanes = 1 ;
    	pbitinfo.biSize = sizeof(BITMAPINFOHEADER);
    	pbitinfo.biSizeImage =size;
    	pbitinfo.biWidth = bit.bmWidth;
    	pbitinfo.biXPelsPerMeter = 0;
    	pbitinfo.biYPelsPerMeter = 0 ;
    
    	GetDIBits(pdeskdc->m_hDC , bmp , 0 , pbitinfo.biHeight , lpdata , 
    		(BITMAPINFO*)&pbitinfo,DIB_RGB_COLORS);
    
    	BITMAPFILEHEADER bfh;
    	bfh.bfReserved1 = bfh.bfReserved2 = 0 ;
    	bfh.bfType = ((WORD)('M'<< 8)|'B');
    	bfh.bfSize = 54 + size ; 
    	bfh.bfOffBits = 54 ;
    	
    	//写入文件
    
    	CFile file;
    	if ( file.Open("1.bmp" , CFile::modeCreate|CFile::modeWrite) )
    	{
    		file.WriteHuge( &bfh , sizeof(BITMAPFILEHEADER) );
    		file.WriteHuge(&pbitinfo , sizeof(BITMAPINFOHEADER));
    		file.WriteHuge(lpdata , size);
    		file.Close();
    	}
    	GlobalFree(lpdata);</strong>