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If you have used word-processing software such as Microsoft Word, you may be familiar with the concept of "auto text." PDFtoolkit brings the same functionality to PDF by supporting placeholders in PDF page text-outs. You can use placeholders with TgtTextWatermarkTemplate
class and the TgtDFDocument.TextOut
method. PDFtoolkit comes with the following built-in placeholders.
Placeholder | Substituted By |
---|---|
PageNo | Number of current page |
TotPage | Total number of pages |
ShortDate | Date in short format |
ShortTime | Time in short format |
LongDate | Date in long format |
LongTime | Date in long format |
Author | Document author property (See TgtPDFDocument.DocInfo) |
Creator | Document creator property (See TgtPDFDocument.DocInfo) |
Subject | Document subject property (See TgtPDFDocument.DocInfo) |
Title | Document title property (See TgtPDFDocument.DocInfo) |
PDFtoolkit also supports custom or user-defined placeholders. Your application can provide values for custom placeholders by handling the TgtPDFDocument.OnCalcVariables
event.
Both built-in and custom placeholders need to be delimited by <% and %>. When the output document is being paged, the placeholders will be replace with their values available at run time. Here is an example.
{ This code example illustrates how to write text watermarks to a document. It also illustrates the use of autotext placeholders. } program Examples_Autotext; {$APPTYPE CONSOLE} uses SysUtils, gtPDFDoc, gtCstPDFDoc; var gtPDFDocument1: TgtPDFDocument; gtTextWatermarkTemplate1: TgtTextWatermarkTemplate; begin // Create a document object gtPDFDocument1 := TgtPDFDocument.Create(Nil); gtTextWatermarkTemplate1 := TgtTextWatermarkTemplate.Create(); try // Load input document gtPDFDocument1.LoadFromFile('input_doc.pdf'); // Check if document has loaded successfully if gtPDFDocument1.IsLoaded then begin // Set watermark properties With gtTextWatermarkTemplate1 do begin Font.Name := 'Courier New'; Font.Size := 8; Text := 'Autotext example [PageNo - <%PageNo%>, TotPage - <%TotPage%>, ' + 'ShortDate - <%ShortDate%>, Author - <%Author%>]'; Overlay := false; // Underlay OpacityStroke := 100; // Full opaqueness HorizPos := hpCenter; // Relative positioning VertPos := vpCustom; // Absolute positioning Y := 10; // Absolute vertical position end; // Apply the watermark on all pages gtPDFDocument1.InsertWatermark(gtTextWatermarkTemplate1); // Save modified document gtPDFDocument1.SaveToFile('output_doc.pdf'); end else begin // Output error message Writeln('Sorry, I could not load input_doc.pdf.'); end; except on Err:Exception do begin Writeln('Sorry, an exception was raised. '); Writeln(Err.Classname + ':' + Err.Message); end; end; // Free resources gtPDFDocument1.Reset; // Destroy PDF document object FreeAndNil(gtPDFDocument1); Writeln('Press Enter to exit.'); Readln; end.
And, here is the output.
---o0O0o---
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