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15.1 How do I print a form?
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I am afraid there is not a very easy way to print a form. You may implement
this function with the steps below:
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1. Add a print function to your application.
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To do this, you should add a PrintDocument component to your application.
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Please drag a PrintDocument from the tool box to your form. After that, you
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should create a PrintDialog and add the code to print the document.
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private void buttonPrint_Click(object sender, System.EventArgs e)
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PrintDialog printDialog1 = new PrintDialog();
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printDialog1.Document = printDocument1;
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DialogResult result = printDialog1.ShowDialog();
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if (result == DialogResult.OK)
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For detailed information about print framework, please see "Windows Forms
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Print Support" in the MSDN (October 2001).
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2. Draw the form when printing.
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This step is a little complex. You should handle the PrintPage of the
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printDocument1 and draw the form to the printer device. In the event you
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may copy the form to an image and then draw it to the printer device.
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private void printDocument1_PrintPage(object sender,
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System.Drawing.Printing.PrintPageEventArgs e)
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Graphics graphic = this.CreateGraphics();
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Image memImage = new Bitmap(s.Width, s.Height, graphic);
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Graphics memGraphic = Graphics.FromImage(memImage);
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IntPtr dc1 = graphic.GetHdc();
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IntPtr dc2 = memGraphic.GetHdc();
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BitBlt(dc2, 0, 0, this.ClientRectangle.Width,
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this.ClientRectangle.Height, dc1, 0, 0, 13369376);
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memGraphic.ReleaseHdc(dc2);
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e.Graphics.DrawImage(memImage,0,0);
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The above referenced the article "Screen Capturing a Form in .NET - Using
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GDI in GDI+" by Michael Gold. You may find it at:
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http://www.c-sharpcorner.com/Graphics/ScreenCaptFormMG.asp
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3. Declare the API function.
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Please note the BitBlt function used in Step 2. It is an unmanaged
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function. You should use DllImportAttribute attribute to import it to your
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code. Although, this is the Step 3, you may perform this step any time.
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[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
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private static extern bool BitBlt(
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IntPtr hdcDest, // handle to destination DC
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int nXDest, // x-coord of destination upper-left corner
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int nYDest, // y-coord of destination upper-left corner
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int nWidth, // width of destination rectangle
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int nHeight, // height of destination rectangle
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IntPtr hdcSrc, // handle to source DC
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int nXSrc, // x-coordinate of source upper-left corner
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int nYSrc, // y-coordinate of source upper-left corner
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System.Int32 dwRop // raster operation code
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For more information about DllImportAttribute attribute please see:
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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
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frlrfSystemRuntimeInteropServicesDllImportAttributeClassTopic.asp
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(from Lion Shi (lion_noreply@microsoft.com) on microsoft.public.dotnet.framework.windowsforms)
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