Load File/Open File Differences

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   I understand the difference between the LoadFromFile and DAOpenFile functions, but what I don't understand is that once the PDF file has been loaded/opened why do other functions used afterwards produce different results:

eg. HasFontResources
LoadFromFile = 1
DAOpenFile = 0

eg. GetInformation

LoadFromFile -> Author = Administrator, Title = Old Report
DAOpenFile ->    Author = "",                   Title = ""
Plus Creator, Producer, Creation Date and Modification Date are all different.

Isn't the format/contents of the PDF exactly the same regardless of how you Load/Open the PDF File?

Chris

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chrisreed Members Profile Find Members Posts Team Player Joined: 29 Apr 13 Location: Australia Status: Offline Points: 35	Post Options Post Reply Quote chrisreed Report Post Thanks(0) Quote Reply Topic: Load File/Open File Differences Posted: 02 May 13 at 4:33AM
	I understand the difference between the LoadFromFile and DAOpenFile functions, but what I don't understand is that once the PDF file has been loaded/opened why do other functions used afterwards produce different results: eg. HasFontResources LoadFromFile = 1 DAOpenFile = 0 eg. GetInformation LoadFromFile -> Author = Administrator, Title = Old Report DAOpenFile -> Author = "", Title = "" Plus Creator, Producer, Creation Date and Modification Date are all different. Isn't the format/contents of the PDF exactly the same regardless of how you Load/Open the PDF File? Chris

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 02 May 13 at 7:25AM
	Hi Chris! Perhaps the problem will be clearer if you can offer the document anywhere for test download. Or is it a common prob with any document? Cheers, Ingo

chrisreed Members Profile Find Members Posts Team Player Joined: 29 Apr 13 Location: Australia Status: Offline Points: 35	Post Options Post Reply Quote chrisreed Report Post Thanks(0) Quote Reply Posted: 02 May 13 at 8:10AM
	No it happens on ANY PDF File I load or open. What is strange is that if I use the LoadFile function first followed by the DAOpenFile function the two GetInformation function both get the correct information, but not the other way around. I would show you my code, but it is in LabVIEW and hence is a picture and I can't upload a picture to this post. Is there a public space on the web where I can upload my pictures to and provide a link to that? Chris

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 02 May 13 at 12:24PM
	Hi Chris! For free upload-space you can search on Google. There are many file hoster offering their services. The other thing: You can't use LoadFromFile and DAOpenFile together. It doesn't matter if one way round it works and the other way round not - Don't mix it. Still from your first post: If you're using DALoadFromFile it's absolutely necessary to use the DA-functions to get the metadata like "author", "subject", and so on. Again: Don't mix DA- and non-DA in one code part between create and free. Cheers, Ingo Edited by Ingo - 02 May 13 at 12:26PM

chrisreed Members Profile Find Members Posts Team Player Joined: 29 Apr 13 Location: Australia Status: Offline Points: 35	Post Options Post Reply Quote chrisreed Report Post Thanks(0) Quote Reply Posted: 03 May 13 at 11:09AM
	Hi Ingo, Here is the link to my code in LabVIEW..... http://postimg.org/gallery/6uafpxai/ I get what you're saying, but even when I did use the DAGetInformation function with the other DA Functions I still didn't get exactly the same results, but that's OK GetAnalysisInfo function matches. P.S. Is there such a function as DALoadFromFile, because I couldn't find it? Chris

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 08 May 13 at 2:04PM
	Chris, As Ingo says, when you load a file using DAOpenFile then you can only use functions starting with DA to work with this file. The standard functions will not work with a file that has been opened with DAOpen file. Basically, you cannot mix DA and standard calls and expect them to work. Both sets of functions use completely different methods to work with a PDF file. GetAnalysisInfo is a 3rd way of working with a PDF file as it uses a filename - the function automatically opens the file, gets the required information and closes the file for you. There is of DALoadFromFile - only DAOpenFile. Most people use QP.LoadFromFile. You really only need the DA functions for quite large PDF files. Andrew.