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Rectangle R = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
Image img = new Bitmap(R.Width, R.Height);
Graphics G = Graphics.fromImage(img);
G.CopyfromScreen(new Point(0, 0), new Point(0, 0), new Size(R.Width, R.Height));¡£
IntPtr dc = G.GetHdc(); 
G.ReleaseHdc(dc);
G.Dispose();
img .Save("c:\\a.jpg");
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private static extern bool BitBlt(IntPtr hdcDest,int nXDest,int nYDest,int nWidth,int nHeight,IntPtr hdcSrc,int nXSrc,int nYSrc,Int32 dwrop);
http://topic.csdn.net/u/20090702/11/845f5ac5-48f2-463a-8271-47c5eeb33cab.html

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C# code:
Rectangle R = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
Image img = new Bitmap(R.Width, R.Height);
Graphics G = Graphics.fromImage(img);
G.CopyfromScreen(new Point(0, 0), new Point(0, 0), new Size(R.Width, R.Height));¡£
IntPtr dc = G.GetHdc();
G.ReleaseHdc(dc);
G.Dispose();
img .Save("c:\\a.jpg");

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JScript code:

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if (!mainwin.getAttribute("xmlns:html"))
mainwin.setAttribute("xmlns:html", "http://www.w3.org/1999/xhtml");

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