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Building a PDF Bundle causes System.OutOfMemoryException on large PDF's

We are currently deploying Aspose.Pdf.dll V8.5.0.0 to our customers, but the same issue exists in the latest version.

In summary:

• We are building PDF “bundles” of multiple files of differing types, converting them to PDF first, concatenating all PDF’s, adding a table of contents with links and page numbering, among other tasks.
• We took code from this article and built on this although we have a test app where we can recreate this issue https://docs.aspose.com/display/pdfnet/Concatenate+PDF+files+and+create+Table+Of+Contents and are experiencing System.OutOfMemoryException on larger files.
• The actual concatenation of the files is quick and easy, but the memory isn’t released well afterwards. After the concatenation, the OutOfMemoryException has been seen to occur at lines :
o concatenated_pdfDocument.Save(Document_With_BlankPage); or
o fileStamp.Save(Document_with_TOC_Heading);
• Originally we believed this issue was due to our customer having larger than expected PDF files, (>60MB, 2 page scans) but when they scanned these at a more appropriate resolution the problem still occurs, but the issue is “postponed” until the resulting concatenated PDF is larger.
• In addition, if page numbering is selected, a System.IO.IOException can also be thrown, but only on large files again.
• By way of an example, a sample bundle I have
o contains 31 files ranging from 10KB to 62MB, with a total pre-concatenated size of 242MB
o the concatenate produces a single PDF of 241MB
• The exception details are below

Is there a better way we should be doing this, or is there a limitation as to the file sizes that we should be handling? Any help much appreciated.

System.OutOfMemoryException was unhandled
Message=Exception of type ‘System.OutOfMemoryException’ was thrown.
at System.IO.MemoryStream.set_Capacity(Int32 value)
at System.IO.MemoryStream.EnsureCapacity(Int32 value)
at System.IO.MemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.BinaryWriter.Write(Byte[] buffer, Int32 index, Int32 count)
at . . (Byte[] , Int32 , Int32 )
at . . . ( , , Boolean , Int64& )
at . . . ( , )
at . . ( , , Boolean , Int64& )
at . . ( , )
at . . . ( , , Boolean , Int64& )
at . . . ( streamWriter, pdfPrimitive, Int64& offset)
at . . ( , , Boolean , Int64& )
at . . ( streamWriter, pdfPrimitive, Int64& offset)
at . . ( , )
at . . ()
at . .Save(Stream )
at . .Save(Stream )
at Aspose.Pdf.Document.Save(Stream output)
at Aspose.Pdf.Facades.SaveableFacade.Save(Stream destStream)
at Aspose.Pdf.Facades.PdfFileStamp.Save(Stream destStream)
at AsposeTest.frmMain.CreateConcatenatedPDFFile(String[] pdfFiles) in C:\src\Product Team\AsposeTest\Form1.cs:line 863
at AsposeTest.frmMain.btnCombine_Click(Object sender, EventArgs e) in C:\src\Product Team\AsposeTest\Form1.cs:line 557
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at AsposeTest.Program.Main() in C:\src\Product Team\AsposeTest\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()


Thanks for contacting support.

Please make sure that your program is using x64 mode of debugging as it is recommended when you are dealing with file(s) with larger sizes. In x64 mode of debugging, your program have access to full memory, installed in your environment.

Furthermore, if you still experience any issue, please share your code snippet which you are using to execute the routine and sample input document(s), along with your environment details (i.e API Version, OS Version, Installed Memory, Application Type). This way we can test the scenario in our environment and address it accordingly.

Please note that our forum supports maximum upload size of 3.0MB, so in case of larger size, you can upload file(s) to some public sharer (e.g dropbox) and share the link here.

Best Regards,
Asad Ali