In the world of document processing, converting Rich Text Format (RTF) files to Portable Document Format (PDF) is a common task. This conversion ensures the document’s layout remains consistent across different platforms. This guide provides detailed solutions for efficient RTF to PDF conversion using our PDF developer library in Delphi, C# and VB.Net. By following this guide, you can seamlessly transform RTF files into PDF documents while maintaining high fidelity to the original content. Let’s walk through the process step-by-step.
The primary challenge here is to convert an RTF file into a PDF file while ensuring that the formatting and layout of the original document are preserved. This involves:
Below is a Delphi implementation that demonstrates the conversion of an RTF file to a PDF file using the our PDF Library,
The following uses the DLL version of the PDF development library (A Pascal source code version is also available for Delphi):
unit MainUnit; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ComCtrls, PDFlibAX_TLB, ActiveX; type TForm1 = class(TForm) RichEdit1: TRichEdit; Button1: TButton; procedure FormCreate(Sender: TObject); procedure Button1Click(Sender: TObject); private function PrintRtfBox(hDc: HDC; rtfBox: TRichEdit; FirstChar: Integer): Integer; public end; var Form1: TForm1; PdfDoc: TPDFLibrary; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject); begin PdfDoc := TPDFLibrary.Create(Self); RichEdit1.Width := Round(ScaleX(210, mmPixel)); RichEdit1.Height := Round(ScaleY(297, mmPixel)); RichEdit1.Lines.LoadFromFile(ExtractFilePath(Application.ExeName) + 'Test.rtf'); end; procedure TForm1.Button1Click(Sender: TObject); var Dc: HDC; PageNumber, LastChar, PdfDocId: Integer; begin PageNumber := 1; LastChar := 0; repeat Dc := PdfDoc.GetCanvasDC(Round(ScaleX(210, mmPixel)), Round(ScaleY(297, mmPixel))); LastChar := PrintRtfBox(Dc, RichEdit1, LastChar); PdfDoc.LoadFromCanvasDc(96, 0); PdfDocId := PdfDoc.SelectedPdfDocument; PdfDoc.SaveToFile(ExtractFilePath(Application.ExeName) + 'Test' + IntToStr(PageNumber) + '.pdf'); PdfDoc.RemovePdfDocument(PdfDocId); Inc(PageNumber); until LastChar = 0; ShowMessage('Done'); end; function TForm1.PrintRtfBox(hDc: HDC; rtfBox: TRichEdit; FirstChar: Integer): Integer; var RcDrawTo, RcPage: TRect; Fr: TFormatRange; NextCharPosition: Integer; begin RcPage.Left := 0; RcPage.Right := rtfBox.Left + rtfBox.Width + 100; RcPage.Top := 0; RcPage.Bottom := rtfBox.Top + rtfBox.Height + 100; RcDrawTo.Left := rtfBox.Left; RcDrawTo.Top := rtfBox.Top; RcDrawTo.Right := rtfBox.Left + rtfBox.Width; RcDrawTo.Bottom := rtfBox.Top + rtfBox.Height; Fr.hdc := hDc; Fr.hdcTarget := hDc; Fr.rc := RcDrawTo; Fr.rcPage := RcPage; Fr.chrg.cpMin := FirstChar; Fr.chrg.cpMax := -1; NextCharPosition := SendMessage(rtfBox.Handle, EM_FORMATRANGE, 1, LPARAM(@Fr)); if NextCharPosition < Length(rtfBox.Text) then Result := NextCharPosition else Result := 0; end; end.
Below is a C# implementation that achieves the same functionality as the Delphi example.
using System; using System.Runtime.InteropServices; using System.Windows.Forms; using PDFLibrary; namespace RtfToPdf { public partial class Form1 : Form { private PDFLibrary PdfDoc; [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; public int cpMax; } [StructLayout(LayoutKind.Sequential)] private struct FormatRange { public IntPtr hDc; public IntPtr hdcTarget; public RECT rc; public RECT RcPage; public CharRange chrg; } private const int WM_USER = 0x400; private const int EM_FORMATRANGE = WM_USER + 57; [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, ref FormatRange lParam); public Form1() { InitializeComponent(); PdfDoc = new PDFLibrary(); } private void Form1_Load(object sender, EventArgs e) { richTextBox1.SetBounds(0, 0, Convert.ToInt32(ScaleX(210, GraphicsUnit.Millimeter, GraphicsUnit.Pixel)), Convert.ToInt32(ScaleY(297, GraphicsUnit.Millimeter, GraphicsUnit.Pixel))); richTextBox1.LoadFile(Application.StartupPath + "\\Test.rtf"); } private void button1_Click(object sender, EventArgs e) { IntPtr Dc; int PageNumber = 1; int LastChar = 0; int PdfDocId; do { Dc = PdfDoc.GetCanvasDC(Convert.ToInt32(ScaleX(210, GraphicsUnit.Millimeter, GraphicsUnit.Pixel)), Convert.ToInt32(ScaleY(297, GraphicsUnit.Millimeter, GraphicsUnit.Pixel))); LastChar = PrintRtfBox(Dc, richTextBox1, LastChar); PdfDoc.LoadFromCanvasDc(96, 0); PdfDocId = PdfDoc.SelectedPdfDocument; PdfDoc.SaveToFile(Application.StartupPath + "\\Test" + PageNumber + ".pdf"); PdfDoc.RemovePdfDocument(PdfDocId); PageNumber++; } while (LastChar != 0); MessageBox.Show("Done"); } private int PrintRtfBox(IntPtr hDc, RichTextBox rtfBox, int FirstChar) { RECT RcDrawTo = new RECT(); RECT RcPage = new RECT(); FormatRange Fr = new FormatRange(); RcPage.Left = 0; RcPage.Right = rtfBox.Left + rtfBox.Width + 100; RcPage.Top = 0; RcPage.Bottom = rtfBox.Top + rtfBox.Height + 100; RcDrawTo.Left = rtfBox.Left; RcDrawTo.Top = rtfBox.Top; RcDrawTo.Right = rtfBox.Left + rtfBox.Width; RcDrawTo.Bottom = rtfBox.Top + rtfBox.Height; Fr.hDc = hDc; Fr.hdcTarget = hDc; Fr.rc = RcDrawTo; Fr.RcPage = RcPage; Fr.chrg.cpMin = FirstChar; Fr.chrg.cpMax = -1; IntPtr wParam = new IntPtr(1); IntPtr NextCharPosition = SendMessage(rtfBox.Handle, EM_FORMATRANGE, wParam, ref Fr); if (NextCharPosition.ToInt32() < rtfBox.Text.Length) return NextCharPosition.ToInt32(); else return 0; } private float ScaleX(float value, GraphicsUnit fromUnit, GraphicsUnit toUnit) { using (Graphics g = this.CreateGraphics()) { return value * g.DpiX / 96.0f; } } private float ScaleY(float value, GraphicsUnit fromUnit, GraphicsUnit toUnit) { using (Graphics g = this.CreateGraphics()) { return value * g.DpiY / 96.0f; } } } }
PrintRtfBox
function (or method) formats the RTF content and prints it to the device context. This method calculates the required dimensions and calls the appropriate Windows API to handle the text formatting.By adhering to these steps, we ensure a reliable and accurate transformation of RTF files into PDF documents, leveraging the capabilities of losLab PDF Library. This approach guarantees that the original formatting and layout are preserved, resulting in professional-quality PDF outputs.
In addition, we also provide a VB.Net implementation, which has the same functionality as the Delphi and C# examples:
Imports System.Runtime.InteropServices Imports PDFlibDLL Public Class Form1 Private PdfDoc As PDFlibrary <StructLayout(LayoutKind.Sequential)> Private Structure RECT Public Left As Integer Public Top As Integer Public Right As Integer Public Bottom As Integer End Structure <StructLayout(LayoutKind.Sequential)> Private Structure CharRange Public cpMin As Integer Public cpMax As Integer End Structure <StructLayout(LayoutKind.Sequential)> Private Structure FormatRange Public hDc As IntPtr Public hdcTarget As IntPtr Public rc As RECT Public rcPage As RECT Public chrg As CharRange End Structure Private Const WM_USER As Integer = &H400 Private Const EM_FORMATRANGE As Integer = WM_USER + 57 <DllImport("user32.dll", CharSet:=CharSet.Auto)> Private Shared Function SendMessage(hWnd As IntPtr, wMsg As Integer, wParam As IntPtr, ByRef lParam As FormatRange) As IntPtr End Function Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load PdfDoc = New PDFlibrary() RichTextBox1.SetBounds(0, 0, Convert.ToInt32(ScaleX(210, GraphicsUnit.Millimeter, GraphicsUnit.Pixel)), Convert.ToInt32(ScaleY(297, GraphicsUnit.Millimeter, GraphicsUnit.Pixel))) RichTextBox1.LoadFile(Application.StartupPath & "\Test.rtf") End Sub Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Dim Dc As IntPtr Dim PageNumber As Integer = 1 Dim LastChar As Integer = 0 Dim PdfDocId As Integer Do Dc = PdfDoc.GetCanvasDC(Convert.ToInt32(ScaleX(210, GraphicsUnit.Millimeter, GraphicsUnit.Pixel)), Convert.ToInt32(ScaleY(297, GraphicsUnit.Millimeter, GraphicsUnit.Pixel))) LastChar = PrintRtfBox(Dc, RichTextBox1, LastChar) PdfDoc.LoadFromCanvasDc(96, 0) PdfDocId = PdfDoc.SelectedPdfDocument PdfDoc.SaveToFile(Application.StartupPath & "\Test" & PageNumber & ".pdf") PdfDoc.RemovePdfDocument(PdfDocId) PageNumber += 1 Loop While LastChar <> 0 MessageBox.Show("Done") End Sub Private Function PrintRtfBox(hDc As IntPtr, rtfBox As RichTextBox, FirstChar As Integer) As Integer Dim RcDrawTo As New RECT() Dim RcPage As New RECT() Dim Fr As New FormatRange() RcPage.Left = 0 RcPage.Right = rtfBox.Left + rtfBox.Width + 100 RcPage.Top = 0 RcPage.Bottom = rtfBox.Top + rtfBox.Height + 100 RcDrawTo.Left = rtfBox.Left RcDrawTo.Top = rtfBox.Top RcDrawTo.Right = rtfBox.Left + rtfBox.Width RcDrawTo.Bottom = rtfBox.Top + rtfBox.Height Fr.hDc = hDc Fr.hdcTarget = hDc Fr.rc = RcDrawTo Fr.rcPage = RcPage Fr.chrg.cpMin = FirstChar Fr.chrg.cpMax = -1 Dim wParam As IntPtr = New IntPtr(1) Dim NextCharPosition As IntPtr = SendMessage(rtfBox.Handle, EM_FORMATRANGE, wParam, Fr) If NextCharPosition.ToInt32() < rtfBox.Text.Length Then Return NextCharPosition.ToInt32() Else Return 0 End If End Function Private Function ScaleX(value As Single, fromUnit As GraphicsUnit, toUnit As GraphicsUnit) As Single Using g As Graphics = Me.CreateGraphics() Return value * g.DpiX / 96.0F End Using End Function Private Function ScaleY(value As Single, fromUnit As GraphicsUnit, toUnit As GraphicsUnit) As Single Using g As Graphics = Me.CreateGraphics() Return value * g.DpiY / 96.0F End Using End Function End Class
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