2010-10-01 6 views

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De https://support.microsoft.com/en-us/kb/812425:

Dans Visual C# ou Visual C# 2005, créez un nouveau projet de bibliothèque de classes nommé RichTextBoxPrintCtrl. Par défaut, Class1.cs est créé. Modifiez le nom de Class1.cs en RichTextBoxPrintCtrl.cs. Dans l'Explorateur de solutions, cliquez avec le bouton droit sur Références, puis cliquez sur Ajouter une référence. Dans la boîte de dialogue Ajouter une référence, double-cliquez sur System.Drawing.dll et System.Windows.Forms.dll, puis cliquez sur OK.

Remplacez le code existant dans RichTextBoxPrintCtrl.cs avec le code suivant:

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(); 
     } 

    } 
} 

Dans le menu Debug, cliquez sur Démarrer pour exécuter l'application. Form1 est affiché. Saisissez du texte dans RichTextBoxPrintCtrl. Cliquez sur Mise en page pour définir les paramètres de la page. Cliquez sur Aperçu avant impression pour afficher l'aperçu avant impression de la page. Cliquez sur Imprimer pour imprimer le contenu de RichTextBoxPrintCtrl.

+0

Lien direct: http://support.microsoft.com/default.aspx?scid=kb;en-us;812425 – amalgamate

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