eDocEngine VCL
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Delphi C++Builder

Export From DevExpress ExpressPrinting System To PDF And Other Formats

Using eDocEngine VCL
By V. Subhash

The ExpressPrinting System from DevExpress allows you to output the contents of several VCL controls to paper with a great degree of control over print attributes such as font, color, headers, and footers.

eDocEngine can leverage the capabilities of ExpressPrinting System to export the contents of VCL to formats such as PDF, RTF, EMF, BMP, JPEG, etc. For this purpose, eDocEngine provides the TgtXPressPrntInterface interface component.

To make it work on an application built with ExpressPrinting System, an instance of this interface component needs to be paired up with an eDocEngine document-creation engine component. For example, to export the print output of a string grid to a PDF document, a TgtXPressPrntInterface instance needs to be paired with a TgtPDFEngine instance on the same form as a TdxComponentPrinter. Let us see an example.

From ExpressPrinting System To PDF

  1. Open your IDE and create a VCL Forms Application project. This will create a form.
  2. Drop the following components on the form.
    1. Tbutton (2 Nos.)
    2. TStringGrid
    3. TdxComponentPrinter
    4. TgtPDFEngine
    5. TgtRTFEngine
    6. TgtXPressPrntInterface (2 Nos.)
  • Back on the form, double-click the buttons and add these click-event handlers.
    // Populate the grid
    procedure TForm1.Button1Click(Sender: TObject);
    begin
      With StringGrid1 do begin
        Cells[1,1] := '1, 1';
        Cells[2,2] := '2, 2';
        Cells[3,3] := '3, 3';
      end;
    end;
    
    // Print the grid content using ExpressPrinting System
    // and export the print output to PDF and RTF using
    // eDocEngine
    procedure TForm1.Button2Click(Sender: TObject);
    var
      BasedxReportLink1: TBasedxReportLink;
    begin
      // Connect the export interface components with
      // engine components
      gtXPressPrntInterface1.Engine := gtPDFEngine1;
      gtXPressPrntInterface2.Engine := gtRTFEngine1;
    
      // Specify the file names for PDF and RTF output
      gtPDFEngine1.FileName := 'eDoc_DevExpress_Demo.pdf';
      gtRTFEngine1.FileName := 'eDoc_DevExpress_Demo.rtf';
    
      // Disable engine dialogs
      gtPDFEngine1.Preferences.ShowSetupDialog := false;
      gtRTFEngine1.Preferences.ShowSetupDialog := false;
    
      // Specify controls whose contents need to be printed
      BasedxReportLink1 := dxComponentPrinter1.AddLink(StringGrid1);
    
      // Export print output to PDF and RTF
      gtXPressPrntInterface1.RenderDocument(dxComponentPrinter1, BasedxReportLink1);
      gtXPressPrntInterface2.RenderDocument(dxComponentPrinter1, BasedxReportLink1);
    end;
    
  • Run the project to start the application.
  • Click the first button on the application to populate the string grid with our test data.
  • Click the second button to print the contents of the string grid and export the print output to PDF and RTF.
  • ---o0O0o---

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