void GetScreenBmp(HWND hwnd,int left,int top,int width,int height,CString path){ CDC *pDC;//屏幕DC pDC = CDC::FromHandle(::GetDC(hwnd));//获取屏幕DC(0为全屏，句柄则为窗口) int BitPerPixel = pDC->GetDeviceCaps(BITSPIXEL);//获得颜色模式 if(width==0 && height==0)//默认宽度和高度为全屏 { width = pDC->GetDeviceCaps(HORZRES); //设置图像宽度全屏 height= pDC->GetDeviceCaps(VERTRES); //设置图像高度全屏 } CDC memDC;//内存DC memDC.CreateCompatibleDC(pDC); CBitmap memBitmap, *oldmemBitmap;//建立和屏幕兼容的bitmap memBitmap.CreateCompatibleBitmap(pDC, width, height); oldmemBitmap = memDC.SelectObject(&memBitmap);//将memBitmap选入内存DC //memDC.BitBlt(0, 0, Width, Height, pDC, 0, 0, SRCCOPY);//复制屏幕图像到内存DC memDC.BitBlt(0, 0, width, height, pDC, left,top , SRCCOPY);//图像宽度高度和截取位置 //以下代码保存memDC中的位图到文件 BITMAP bmp; memBitmap.GetBitmap(&bmp);//获得位图信息 FILE *fp = fopen(path, \"w+b\");//图片保存路径和方式 BITMAPINFOHEADER bih = {0};//位图信息头 bih.biBitCount = bmp.bmBitsPixel;//每个像素字节大小 bih.biCompression = BI_RGB; bih.biHeight = bmp.bmHeight;//高度 bih.biPlanes = 1; bih.biSize = sizeof(BITMAPINFOHEADER); bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;//图像数据大小 bih.biWidth = bmp.bmWidth;//宽度 BITMAPFILEHEADER bfh = {0};//位图文件头 bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//到位图数据的偏移量 bfh.bfSize = bfh.bfOffBits + bmp.bmWidthBytes * bmp.bmHeight;//文件总的大小 bfh.bfType = (WORD)0x4d42; fwrite(&bfh, 1, sizeof(BITMAPFILEHEADER), fp);//写入位图文件头 fwrite(&bih, 1, sizeof(BITMAPINFOHEADER), fp);//写入位图信息头 byte * p = new byte[bmp.bmWidthBytes * bmp.bmHeight];//申请内存保存位图数据 GetDIBits(memDC.m_hDC, (HBITMAP) memBitmap.m_hObject, 0, height, p, (LPBITMAPINFO) &bih, DIB_RGB_COLORS);//获取位图数据 fwrite(p, 1, bmp.bmWidthBytes * bmp.bmHeight, fp);//写入位图数据 delete [] p; fclose(fp); memDC.SelectObject(oldmemBitmap);}
HBITMAP GetScreenBmp(){ HWND hwnd = ::GetDesktopWindow(); HDC hsrc = ::GetDC(hwnd); HDC hmemdc = ::CreateCompatibleDC(hsrc); RECT rc; ::GetWindowRect(hwnd,&rc); SIZE sz;sz.cx=rc.right-rc.left;sz.cy=rc.bottom-rc.top; HBITMAP hbmp = ::CreateCompatibleBitmap(hsrc,sz.cx,sz.cy); HGDIOBJ holdbmp = ::SelectObject(hmemdc,hbmp); ::BitBlt(hmemdc,0,0,sz.cx,sz.cy,hsrc,rc.left,rc.top,SRCCOPY); ::SelectObject(hmemdc,holdbmp); ::DeleteObject(hmemdc); ::ReleaseDC(hwnd,hsrc); return hbmp;}
