GetData Method    

Saves a document to memory.

 

    

Syntax		  

Data = Doc.GetData()

 

    

Params		  
Name Type Description
Data Array of Bytes The PDF document as an array of bytes.

 

    

Notes		  

Normally, you will want to save your documents using the Save method. However, sometimes, you will need to obtain your PDF as raw data rather than in file format. The GetData method allows you to do this.

You may wish to write a PDF direct to a client browser rather than going through an intermediate file. The data you obtain using GetData can be written directly to an HTTP stream using Response.BinaryWrite. Similarly, you may wish to obtain raw data for insertion into a database.

PDFs and Internet Explorer. The combination of Internet Explorer and Acrobat is not always trouble-free - particularly under https or using older versions of Internet Explorer. It can be difficult to know exactly where the problem lies because there is an interaction of the Operating System, Internet Explorer and Acrobat. Any of these can be the cause.

Sometimes, Internet Explorer may get 'stuck' on a particular content type and insist on displaying your PDF as HTML. In this case, you will see random text starting with %PDF. Sometimes, this can happen if you stream PDF data to a window which was previously displaying HTML.

Sometimes, server-side debugging results in extra data being inserted into the content stream. While this may not matter for HTML, it will corrupt binary documents like PDF.

Sometimes, your code may inadvertently insert extra data into the content stream. Again, this will corrupt the PDF. Error messages are a common cause of this kind of corruption.

HTTP compression may result in PDF streams being compressed before they are returned to the browser. While browsers are able to deal with this type of compression, Acrobat may not be able to. You can see whether this type of compression is being used by examining the headers returned to the browser using a tool like IEWatch. If you are using IIS 6 compression, you can disable it on a page-by-page basis using the IIS Metabase Explorer from the IIS 6 resource kit.

For testing purposes, you may wish to change the content-disposition from 'inline' to 'attachment'. This will allow you to download the data rather than viewing it in your browser. You can then check the downloaded document using Acrobat or a hex editor.

Alternatively, if the problem is that PDFs seem to be cached, you may wish to check the 'Enable Content Expiration' checkbox you will find under the Web Site Properties.

We would suggest two steps:

  1. Your first step should be to eliminate ABCpdf as the cause. Why not save the PDF to disk at the same time as sending it to the client? That way you can establish that the PDF is fine. If you want to take it further, you can then read the PDF data from disk and stream it direct to the client.
  2. The example site streams PDF data direct to the client. So install the example site into a new virtual directory, and establish whether the same issue exists for the example site. If it works, then it's simply a matter of moving your current code base and the example site code base towards each other until you find the cause of the problem.

 

    

Example		  

The following code illustrates how one might add text to a PDF and then write it direct to the client browser. This code is an entire Active Server Page - hello.asp.

<% @Language="VBScript" EnableSessionState=FALSE %>

<%
Set theDoc = Server.CreateObject("ABCpdf13.Doc")
theDoc.FontSize = 96
theDoc.AddText "Hello World"
theData = theDoc.GetData()
Response.ContentType = "application/pdf"
Response.AddHeader "content-length", UBound(theData) - LBound(theData) + 1
Response.AddHeader "content-disposition", "inline; filename=MyPDF.PDF"
Response.BinaryWrite theData
%>


hello.asp