Error OCRing large file

PDF-X OCR SDK is a New product from us and intended to compliment our existing PDF and Imaging Tools to provide the Developer with an expanding set of professional tools for Optical Character Recognition tasks

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Tom Princen
Posts: 83
Joined: Wed Mar 25, 2015 10:15 am

Error OCRing large file

Post by Tom Princen » Wed Dec 21, 2016 9:11 am

When I try to ocr a file I get this error:

System.Runtime.InteropServices.SEHException was unhandled
Message=Een extern onderdeel heeft een uitzondering veroorzaakt.
bij _Namespace..OCR_MakeSearchable(IntPtr pdf, PXO_Options& Options, IntPtr pagelist)
bij _Namespace..OCR_MakeSearchable_NoRef(IntPtr pdf, PXO_Options Options) in C:\Visual Studio Projects\\\.cs:regel 13
bij WindowsFormsApplication1.Form1.button2_Click(Object sender, EventArgs e) in C:\Visual Studio Projects\\WindowsFormsApplication1\Form1.cs:regel 114
bij System.Windows.Forms.Control.OnClick(EventArgs e)
bij System.Windows.Forms.Button.OnClick(EventArgs e)
bij System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
bij System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
bij System.Windows.Forms.Control.WndProc(Message& m)
bij System.Windows.Forms.ButtonBase.WndProc(Message& m)
bij System.Windows.Forms.Button.WndProc(Message& m)
bij System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
bij System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
bij System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
bij System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
bij System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
bij System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
bij System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
bij System.Windows.Forms.Application.Run(Form mainForm)
bij WindowsFormsApplication1.Program.Main() in C:\Visual Studio Projects\\WindowsFormsApplication1\Program.cs:regel 18
bij System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
bij System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
bij Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
bij System.Threading.ThreadHelper.ThreadStart_Context(Object state)
bij System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
bij System.Threading.ThreadHelper.ThreadStart()

BTW I Could not attach file: The file is too big, maximum allowed size is 5 MiB...

Ivan - Tracker Software
Site Admin
Posts: 3621
Joined: Thu Jul 08, 2004 10:36 pm
Location: Vancouver Island - Canada

Re: Error OCRing large file

Post by Ivan - Tracker Software » Thu Dec 22, 2016 11:59 pm

If you are using 32-bit DLL, I'm afraid the process cannot allocate continues chunk of memory large enough to keep required images for OCR, as the 32-bit processes has limited address space and that space often become fragmented, so, even if most of the address space is free, there are no continues block of memory.

As a solution I can see switching to 64-bit DLLs, if possible, or try to reduce quality/DPI used for OCR documents.
Tracker Software (Project Director)

When attaching files to any message - please ensure they are archived and posted as a .ZIP, .RAR or .7z format - or they will not be posted - thanks.

Tom Princen
Posts: 83
Joined: Wed Mar 25, 2015 10:15 am

Re: Error OCRing large file

Post by Tom Princen » Fri Dec 23, 2016 10:39 am

Switching to 64 is not that simple.

Another option is to implement better memory handling in your code...

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Paul - Tracker Supp
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Posts: 5016
Joined: Wed Mar 25, 2009 10:37 pm
Location: Chemainus, Canada

Re: Error OCRing large file

Post by Paul - Tracker Supp » Fri Dec 23, 2016 7:45 pm

Hi Tom,

we are always working on improving our code. Given the declining use of 32 bit systems and the 64 bit solution presented, we would consider this is a rather low priority "issue" I'm afraid.

I do not expect to see the 32 bit code "improved" in any practical time frame for your purposes, if at all.

I do apologise for any inconvenience this may cause.
If posting files to this forum - you must archive the files to a ZIP, RAR or 7z file or they will not be uploaded - thank you.

Best regards

Paul O'Rorke
Tracker Support North America

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