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On May 30, 2007, Gnostice released Version 2.50 of PDFtoolkit VCL. Among the new features is a new method that allows you to extract file attachments from PDF documents and save them to the file system. In this article, I will demonstrate how to make use of this feature. But first, I will demonstrate an old feature of PDFtoolkit that allowed users to add attachments to a PDF document.
In this code snippet, two files (a text file and an BMP image file) are added to a PDF document as file attachments using the method InsertFileAttachment
.
var FileAttach1, FileAttach2: TgtPDFFileAttachment; begin // Creates PDF file attachment objects FileAttach1:= TgtPDFFileAttachment.Create; FileAttach2:= TgtPDFFileAttachment.Create; // Specifies pathname of file for the attachment FileAttach1.FileName:= 'TextAttachment.txt'; // Specifies file name of attachment in the document FileAttach1.AttachmentName:= 'Text.txt'; // Specifies where on a page to place attachment icon FileAttach1.SetBounds(555, 590, 530, 610); // Specifies icon used to identify the attachment FileAttach1.FileAttachmentIcon:= faPaperclip; FileAttach2.FileName:='ImageAttachment.bmp'; FileAttach2.AttachmentName:= 'Image.bmp'; FileAttach2.SetBounds(300, 311, 340, 331); FileAttach2.FileAttachmentIcon:= faPushPin; PDFDoc.LoadFromFile('Input.pdf'); // Attaches files to page 1 PDFDoc.InsertFileAttachment(FileAttach1, 1); PDFDoc.InsertFileAttachment(FileAttach2, 1); PDFDoc.ShowSetupDialog:= False; PDFDoc.SaveToFile('Output.pdf'); FreeAndNil(FileAttach1); FreeAndNil(FileAttach2); end;
Extracting a file attachment involves the use of the new method SaveFileAttachmentTo
and a new event PDFDocAttachmentNameChange
event where you specify a file name for the saved attachment on the file system.
begin // Allows user to select a PDF file OpenDialog1.Execute; // Loads the selected PDF file PDFDoc.LoadFromFile(OpenDialog1.FileName); // Saves files attachments to a folder PDFDoc.SaveFileAttachmentTo('E:\output'); end; procedure TForm1.PDFDocAttachmentNameChange( Sender: TgtCustomPDFDocument; const AFileName: String; var ANewFileName: String); begin // Specifies an alternate name for the saved attachment if AFileName = 'avi.jpg' then ANewFileName := 'Najeeb.jpg'; end;
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