此示例说明如何对当前窗体进行打印预览的副本。

示例

[System.Runtime.InteropServices.DllImport("gdi32.dll")]<br /> public static extern long BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, int dwRop);<br /> private Bitmap memoryImage;<br /> private void CaptureScreen()<br /> {<br /> Graphics mygraphics = this.CreateGraphics();<br /> Size s = this.Size;<br /> memoryImage = new Bitmap(s.Width, s.Height, mygraphics);<br /> Graphics memoryGraphics = Graphics.FromImage(memoryImage);<br /> IntPtr dc1 = mygraphics.GetHdc();<br /> IntPtr dc2 = memoryGraphics.GetHdc();<br /> BitBlt(dc2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, dc1, 0, 0, 13369376);<br /> mygraphics.ReleaseHdc(dc1);<br /> memoryGraphics.ReleaseHdc(dc2);<br /> }<br /> private void printDocument1_PrintPage(System.Object sender, System.Drawing.Printing.PrintPageEventArgs e)<br /> {<br /> e.Graphics.DrawImage(memoryImage, 0, 0);<br /> }<br /> private void printButton_Click(System.Object sender, System.EventArgs e)<br /> {<br /> CaptureScreen();<br /> printPreviewDialog1.Show();<br /> }

编译代码

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