Management of PDF files

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Overview
Simple operations on PDF files in WLanguage
Handling the content of a PDF file in WLanguage

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Management of PDF files

Overview

PDF is one of the most widely used formats for transmitting and storing electronic documents.

Several methods can be used to create or manage PDF files:

Printing in PDF files: PDF files can be created when printing both via the report editor and WLanguage.
For more details, see Printing in PDF.
Viewing PDF files via the PDF Reader control.
For more details, see The PDF Reader control.
Simple operations on PDF files in WLanguage: Check protection, extract a page, merge PDFs, etc.
Handling the content of a PDF file in WLanguage using different types of variables.

Simple operations on PDF files in WLanguage

Various functions allow you to perform simple operations on PDF files. These functions directly handle the PDF file:


PDFExtractPage	Extracts a page from a PDF file in a variable of type Image.
PDFIsProtected	Checks whether the PDF file requires a password in order to be read.
PDFMerge	Merges several existing PDF files into a single PDF file. The files are merged one after another. The paths of PDF files can be found in an array.
PDFMergeWithPassword	Merges several existing and password-protected PDF files into a single PDF file.
PDFNumberOfPages	Returns the total number of pages found in a PDF file.
PDFPassword	Protects a PDF document with a password.
PDFSign	Applies an approval signature to an existing PDF.
PDFToText	Extracts the text found in a PDF file.

Handling the content of a PDF file in WLanguage

To handle more simply the content of a PDF file, WLanguage offers different types of variables:


pdfAttachment	The pdfAttachment type is used to define all the advanced characteristics of an attachment in a PDF document.
pdfDocument	The pdfDocument type gets all the characteristics of a PDF file: author, date created, page content, etc.
pdfPage	The pdfPage type is used to define all the advanced characteristics of a page from a PDF document loaded in memory.
pdfParameter	The pdfParameter type defines all the characteristics of the PDF file to be generated.
pdfSignature	The pdfSignature type is used to define the advanced characteristics of the signature that will be applied to a PDF file when signing an existing PDF (via PDFSign).
pdfTextElement	The pdfTextElement type is used to find out all the characteristics of a text element in a PDF page.

A pdfDocument variable allows loading the content of a PDF file in memory. For example:

MyPDF is pdfDocument = PDFOpen("test.pdf")

MySecondPDF is pdfDocument = "C:\temp\examplePDF.pdf"

From this variable, it is possible to access the pages of the PDF document and for each page, the text of the PDF document. For example:

MyPDF is pdfDocument = "test.pdf"

FOR EACH DocumentPage OF MyPDF.Page
FOR EACH PageElement OF DocumentPage.TextElement
Trace(PageElement.Text)
END
END

With these types of variables, it is possible to delete or add pages to a document using array management functions (Add, Delete, ... ) directly on the array of pdfPage variables contained in the pdfDocument variable.

Example:

MonDocPDF is pdfDocument = PDFOpen("C:\temp\Monguide.pdf")
Trace(MonDocPDF.PDFVersion)
Trace(MonDocPDF.Author)
Trace(MonDocPDF.Page.Occurrence)
Trace(MonDocPDF.Page[1].Largeur)
Trace(MonDocPDF.Page[36].Hauteur)
FOR EACH UnElémentTexte OF MonDocPDF.Page[2].ElémentTexte
Trace(UnElémentTexte.Texte + " X = " +
UnElémentTexte.X + " Y = " + UnElémentTexte.Y + " L = " +
UnElémentTexte.Largeur + " H = " + UnElémentTexte.Hauteur)
END
MonDocPDF2 is pdfDocument = "C:\temp\plan.pdf"
// Ajout de pages
Add(MonDocPDF2.Page, MonDocPDF.Page[5])
// Insertion de pages
Insert(MonDocPDF2.Page, 1, MonDocPDF.Page[32])
// Enregistrement du PDF modifié
PDFSave(MonDocPDF2, "MonDocPDF2.pdf")
ShellExecute("MonDocPDF2.pdf")

Specific PDF functions allow managing pdfDocument variables:


PDFAddImage	Adds an image to a page in an existing PDF file.
PDFAddWatermark	Adds a watermark to all or some pages of an existing PDF file.
PDFClose	Closes the PDF file loaded in memory in a pdfDocument variable.
PDFGetSignature	Gets the signature of a PDF document as a buffer.
PDFGetSignatureDate	Gets the date of one of the signatures of a PDF document.
PDFNbSignatures	Gets the number of signatures in a PDF document.
PDFOpen	Opens a PDF document and loads it in a pdfDocument variable.
PDFSave	Saves the content of a pdfDocument variable in a ".PDF" file.

Remark: Binding to the PDF Reader control:

A pdfDocument variable can be assigned to a PDF Reader control.
A PDF document from a PDF Reader control can be retrieved in a pdfDocument variable.
Example:
MyPDFDoc is pdfDocument
MyPDFDoc = PDF_PDFReader