RenderToStream crash application

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   I have many threads that use RenderToStream for writing document data to stream, very often i get access violation here, sometimes i get error message with link to ntdll.dll, sometimes "System error. Code 5".

function TPdfDocument.RenderPageToStream(dpi, page: integer; output: TRenderOutput; target: TStream): boolean;
var
    res: Integer;
begin
    try
        res := fLib.RenderPageToStream(dpi, page, Ord(output), target);
    except
        Exit(False);
    end;
    Result := res = ERR_Ok;
end;

And after some time, application crash and close without errors. Any ideas? Windows 7, x64

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Ihor.Karalash Members Profile Find Members Posts Beginner Joined: 10 Jun 14 Location: Ukraine Status: Offline Points: 3	Post Options Post Reply Quote Ihor.Karalash Report Post Thanks(0) Quote Reply Topic: RenderToStream crash application Posted: 10 Jun 14 at 2:35PM
	I have many threads that use RenderToStream for writing document data to stream, very often i get access violation here, sometimes i get error message with link to ntdll.dll, sometimes "System error. Code 5". function TPdfDocument.RenderPageToStream(dpi, page: integer; output: TRenderOutput; target: TStream): boolean; var res: Integer; begin try res := fLib.RenderPageToStream(dpi, page, Ord(output), target); except Exit(False); end; Result := res = ERR_Ok; end; And after some time, application crash and close without errors. Any ideas? Windows 7, x64

Ihor.Karalash Members Profile Find Members Posts Beginner Joined: 10 Jun 14 Location: Ukraine Status: Offline Points: 3	Post Options Post Reply Quote Ihor.Karalash Report Post Thanks(0) Quote Reply Posted: 10 Jun 14 at 2:44PM
	From event viewer: Faulting application name: xxx.exe, version: 0.0.0.3, time stamp: 0x53970a6b Faulting module name: ntdll.dll, version: 6.1.7601.18247, time stamp: 0x521ea8e7 Exception code: 0xc0000029 Fault offset: 0x00090892 Faulting process id: 0x674 Faulting application start time: 0x01cf84b15adc7035 Faulting application path: ...\exe\xxx.exe Faulting module path: C:\Windows\SysWOW64\ntdll.dll Report Id: 35db0165-f0a5-11e3-8c36-7071bcb0fcec Edited by Ihor.Karalash - 10 Jun 14 at 3:19PM

tfrost Members Profile Find Members Posts Senior Member Joined: 06 Sep 10 Location: UK Status: Offline Points: 437	Post Options Post Reply Quote tfrost Report Post Thanks(0) Quote Reply Posted: 10 Jun 14 at 3:28PM
	What type of stream are you passing to the function? Have you checked that the stream has been created and has not been closed or modified by one of your other threads? If you are writing direct to a filestream have you tried instead changing to a memorystream and then writing that to file later? When you run the application under the debugger what does the stack trace tell you when the exception occurs? What version of Delphi and Debenu are you using? Google indicates that c000029 may be related to a stack corruption issue: so can you reproduce the issue if you single-thread your application?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3529	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 10 Jun 14 at 9:29PM
	Hi Igor, like TFROST told already... You should check where you're doing the CREATEs and FREEs. Cheers and welcome here, Ingo
	Cheers, Ingo