How to print the content of a RichTextBox control by using Visual C# .NET or Visual C# 2005

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RichTextBoxPrintCtrl ???????? ?????

1. ????? C# .NET ?? Visual C# 2005, ??? ?? ?? ????? ????????? ????????? ?? ????? ??? RichTextBoxPrintCtrl ?????? ???????? ??? ??, Class1.cs ?? ???? ???
2. RichTextBoxPrintCtrl.cs ???? ?? ??? Class1.cs ?? ??? ??????
3. ?????? Explorer ???, ???? ????????????? ????-????? ????, ?? ???? ????????? ??????.
4. ??????????? ??????????? ????? ???, ???-????? ????System.Drawing.dll, ??System.Windows.Forms.dll?? ????-????? ????, ?? ???? ???OK.
5. ?????? ??? RichTextBoxPrintCtrl.cs ??? ????? ??? ?? ???????????? ????:

   using System;
   using System.Windows.Forms;
   using System.Drawing;
   using System.Runtime.InteropServices;
   using System.Drawing.Printing;
   
   namespace RichTextBoxPrintCtrl
   {
   	public class RichTextBoxPrintCtrl:RichTextBox
   	{
   		//Convert the unit used by the .NET framework (1/100 inch) 
   		//and the unit used by Win32 API calls (twips 1/1440 inch)
   		private const double anInch = 14.4;
   
   		[StructLayout(LayoutKind.Sequential)] 
   			private struct RECT
   		{
   			public int Left;
   			public int Top;
   			public int Right;
   			public int Bottom;
   		}
   
   		[StructLayout(LayoutKind.Sequential)]
   			private struct CHARRANGE
   		{
   			public int cpMin;         //First character of range (0 for start of doc)
   			public int cpMax;           //Last character of range (-1 for end of doc)
   		}
   
   		[StructLayout(LayoutKind.Sequential)]
   			private struct FORMATRANGE
   		{
   			public IntPtr hdc;             //Actual DC to draw on
   			public IntPtr hdcTarget;       //Target DC for determining text formatting
   			public RECT rc;                //Region of the DC to draw to (in twips)
   			public RECT rcPage;            //Region of the whole DC (page size) (in twips)
   			public CHARRANGE chrg;         //Range of text to draw (see earlier declaration)
   		}
   
   		private const int WM_USER  = 0x0400;
   		private const int EM_FORMATRANGE  = WM_USER + 57;
   		
   		[DllImport("USER32.dll")]
   		private static extern IntPtr SendMessage (IntPtr hWnd , int msg , IntPtr wp, IntPtr lp); 
   
   		// Render the contents of the RichTextBox for printing
   		//	Return the last character printed + 1 (printing start from this point for next page)
   		public int Print( int charFrom, int charTo,PrintPageEventArgs e)
   		{
   			//Calculate the area to render and print
   			RECT rectToPrint; 
   			rectToPrint.Top = (int)(e.MarginBounds.Top * anInch);
   			rectToPrint.Bottom = (int)(e.MarginBounds.Bottom * anInch);
   			rectToPrint.Left = (int)(e.MarginBounds.Left * anInch);
   			rectToPrint.Right = (int)(e.MarginBounds.Right * anInch);
   
   			//Calculate the size of the page
   			RECT rectPage; 
   			rectPage.Top = (int)(e.PageBounds.Top * anInch);
   			rectPage.Bottom = (int)(e.PageBounds.Bottom * anInch);
   			rectPage.Left = (int)(e.PageBounds.Left * anInch);
   			rectPage.Right = (int)(e.PageBounds.Right * anInch);
   
   			IntPtr hdc = e.Graphics.GetHdc();
   
   			FORMATRANGE fmtRange;
   			fmtRange.chrg.cpMax = charTo;				//Indicate character from to character to 
   			fmtRange.chrg.cpMin = charFrom;
   			fmtRange.hdc = hdc;                    //Use the same DC for measuring and rendering
   			fmtRange.hdcTarget = hdc;              //Point at printer hDC
   			fmtRange.rc = rectToPrint;             //Indicate the area on page to print
   			fmtRange.rcPage = rectPage;            //Indicate size of page
   
   			IntPtr res = IntPtr.Zero;
   
   			IntPtr wparam = IntPtr.Zero;
   			wparam = new IntPtr(1);
   
   			//Get the pointer to the FORMATRANGE structure in memory
   			IntPtr lparam= IntPtr.Zero;
   			lparam = Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));
   			Marshal.StructureToPtr(fmtRange, lparam, false);
   
   			//Send the rendered data for printing 
   			res = SendMessage(Handle, EM_FORMATRANGE, wparam, lparam);
   
   			//Free the block of memory allocated
   			Marshal.FreeCoTaskMem(lparam);
   
   			//Release the device context handle obtained by a previous call
   			e.Graphics.ReleaseHdc(hdc);
   
   			//Return last + 1 character printer
   			return res.ToInt32();
   		}
   
   	}
   }

6. ????? ????????????? ??,??????? ??????RichTextBoxPrintCtrl.dll ??????

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1. ??? ?? Windows ????????? ?? ????? ??? ????? C# .NET ?? Visual C# 2005, ?????????? ???????? ??? ??, Form1.cs ?? ???? ???
   
   ???:??? Visual Studio 2005 ??? ????????? ???? ?? ???? ???? ?????? ?? ?? ?? Windows ??????? ????????? ????? ???, ????? C# ????? ??????? ?? ?? ????????? ?? ??? ???????? ??? ??? ?? ?????? ?? Form1 ??? ???? ??? ??.. ??????? ?? ???????????? ???? ???? ?? ??????? ??? Form1.cs ?? Form1.designer.cs ??? ???? Form1.cs ??? ???? ??? ?????? Designer.cs ????? ?? ????? ?? ???? Windows ?????? ???????? ??? ????? ?? ?? ?? ??? ???????? ?? ???? ???? ?? ??????? ???? ???????? ???? ?? ???? ??.. ????? C# 2005 ??? Windows ??????? ??????? ?? ???? ??? ???? ??????? ?? ??? ????? Microsoft ??? ???? ?? ????:
   HTTP://msdn2.Microsoft.com/en-us/library/ms173077.aspx (http://msdn2.microsoft.com/en-us/library/ms173077.aspx)
2. ?????? ???????Form1 ?? ??? ???????? ????? ????? ?? ????? ????????? ??????????? ?? ??? ???btnPageSetup, ????????? ?? ??? ???????? ?????.
3. ????? ??? ?????????Form1 ?? ??? ???????? ????? ????? ?? ????? ????????? ??????????? ?? ??? ???btnPrintPreview, ????????? ?? ??? ?????????????? ??????? ????.
4. ????? ??? ?????????Form1 ?? ??? ???????? ????? ????? ?? ????? ????????? ??????????? ?? ??? ???btnPrint, ????????? ?? ??? ?????????? ????.
5. ????? ??? ??? ????? ????PrintDialog,PrintPreviewDialog,PrintDocument, ??PageSetupDialogForm1 ?? ??? ?? ?????????? ?? ???????
6. ??????? ?????????????? ???PrintDialog1,PrintPreviewDialog1, ??PageSetupDialog1???? ?? ??? ????????PrintDocument1.
7. ????? ????????????? ??,???????? ???? ????? ?????.
8. ????? ????.NET ????? ?????? ??,???????, ?? ??? ???? ?? ??? ????? ????RichTextBoxPrintCtrl.dll?? ????-????? ????, ?? ???? ???OK.
9. ??????RichTextBoxPrintCtrl?? Form1 ?? ??? ??????
10. ?????? Explorer ???, ???? ?????Form1.cs?? ????-????? ????, ?? ???? ???????? ???.
11. ????? ??? ?????InitializeComponent????:

    		this.printDocument1.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.printDocument1_BeginPrint);
    		this.printDocument1.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.printDocument1_PrintPage);
    		this.btnPrint.Click += new System.EventHandler(this.btnPrint_Click);
    		this.btnPrintPreview.Click += new System.EventHandler(this.btnPrintPreview_Click);
    		this.btnPageSetup.Click += new System.EventHandler(this.btnPageSetup_Click);

12. Form1 ???? ?? ??? ????? ??? ??????:

    		private int checkPrint;
    		private void btnPageSetup_Click(object sender, System.EventArgs e)
    		{
    			pageSetupDialog1.ShowDialog();
    		}
    
    		private void btnPrintPreview_Click(object sender, System.EventArgs e)
    		{
    			printPreviewDialog1.ShowDialog();
    		}
    
    		private void btnPrint_Click(object sender, System.EventArgs e)
    		{
    			if (printDialog1.ShowDialog() == DialogResult.OK)
    				printDocument1.Print();
    		}
    
    		private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
    		{
    			checkPrint = 0;
    		}
    
    		private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    		{
    			// Print the content of RichTextBox. Store the last character printed.
    			checkPrint = richTextBoxPrintCtrl1.Print(checkPrint, richTextBoxPrintCtrl1.TextLength, e);
    
    			// Check for more pages
    			if (checkPrint < richTextBoxPrintCtrl1.TextLength)
    				e.HasMorePages = true;
    			else
    				e.HasMorePages = false;
    		}

13. ????? ???????? ???????? ??,???????????????? ?????? Form1 ????????? ???? ???? ???
14. RichTextBoxPrintCtrl ??? ??? ??? ???? ?????
15. ????? ????,????? ?????????? ?????? ??? ?????
16. ????? ????,??????????? ??????? ????????? ?? ?????? ??????????? ??????
17. ????? ????,??????? ????RichTextBoxPrintCtrl ?? ??????? ?? ?????? ?????

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