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Bit more support needed on locked pdf file problem
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madusmacus  
#1 Posted : Thursday, July 26, 2018 2:17:49 AM(UTC)
madusmacus

Rank: Newbie

Groups: Registered
Joined: 7/25/2018(UTC)
Posts: 6
United Kingdom
I had this same problem with the old free PdfViewer Pdfium wrapper which instigated my purchase of your better SDK

The problem is I use 3rd party PDF creation software and I need to itterate around create/view/create/view untill report is done

Because both systems use the same filename for this I get filelocked errors
(guess i could fil up the disk with tep files bt dotn want to)

bit of code below shows the problem im facing

Code:
void Report_Generate(Object ^sender, EventArgs ^e)
  {

    Report_Initialise();
    CalibrateStatusReport(0);   
    MoreStuff();

    //////// Crashed here PDF file locked 2d time around
    report->Publish(ReportFileName, exportFileFormat); // 3rd party generator

    //////// loadDocument but leaves pdf locked
    pdfViewer1->LoadDocument(Path::GetFullPath(ReportFileName),"");

    //////// WHat i need is a way for LoadDocument to close the PDF after load :¬(
    pdfViewer1->ClosePDFFileAfterLoadingIt(); // So its not locked

  }


Any ideas?
I belive its left open by the pdfium library but in c++ i dont know how to destroy the lock

I guess i could recreate a new pdfviewer1 but i dunno if that would release the file lock anyway
destryoing the old pdfviewer1 in C++/CLR is a bit wacky

Im a bit of a noob so pleas help if you can

Mac


UPDATE>>>>>>>>>>>>>>>>>> found a brute force way to destroy the lock

Code:
      if(pdfViewer1->Document!=nullptr)delete pdfViewer1->Document;


Not ideal realy would like LoadDocument to not lock the file afer its loaded

Edited by moderator Thursday, July 26, 2018 3:03:02 AM(UTC)  | Reason: Not specified
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Paul Rayman  
#2 Posted : Thursday, July 26, 2018 3:12:33 AM(UTC)
Paul Rayman

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Joined: 1/5/2016(UTC)
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Probably you noticed how even a very large PDF document with hundreds thousands of pages loads very fast. This becomes possible because there is not need to parse the entire document body. At first, only the cross-reference table is read and all the rest of data is loaded when needed. As a result, the document does not load into memory completely, the file remains locked and the document can not be changed after opening.

In your case it is possible to do the follows
Code:
        void Report_Generate(string ReportFileName)
        {
            reportPath.Publish(ReportFileName);
            byte[] data = System.IO.File.ReadAllBytes(ReportFileName);
            pdfViewer1.LoadDocument(data);
        }


Of course, you can always close the document in the viewer before saving the report
Code:
        void Report_Generate(string ReportFileName)
        {
            pdfViewer1.CloseDocument();
            reportPath.Publish(ReportFileName);
            pdfViewer1.LoadDocument(ReportFileName);
        }
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madusmacus  
#3 Posted : Thursday, July 26, 2018 3:26:37 AM(UTC)
madusmacus

Rank: Newbie

Groups: Registered
Joined: 7/25/2018(UTC)
Posts: 6
United Kingdom
Hi Paul,

Perfect answer :¬)
Thank you for this fast support
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