Vorbis dev - Jun 2005 - lack of detail for exception in ov_open

I am having one frustrating time trying to decipher why ov_read is failing in my
MFC/C++ application, and I see in Google results that others have had difficulty
as well.  These google discussions generally involve libraries, dll's and
linking options, as though there are perhaps some basic incompatibilities
between ogg vorbis and win32 and/or MFC/C++.  Very confusing.

If I pass fopen a fictitious filename, ov_open returns the proper error. 
However, if I pass a legitimate filename, ov_open crashes without giving me any
apparent clue.

Would anybody have a comment or suggestion?  I get no responses whenever I post
in the codec forums, so I am posting here.  Some kind of clue would certainly be
much appreciated.

"Unhandled exception in Room 101.exe (NTDLL.DLL): 0xC0000005: Access
Violation."

OggVorbis_File vf;
 FILE* pFile;
 pFile = fopen("test.ogg", "rb");
 if(!pFile)
  AfxMessageBox("fopen failed");
 //    here's where I get the exception
 int err = ov_open(pFile, &vf, NULL, 0);

debugger simply says:

NTDLL! 7c918fea()
NTDLL! 7c90104b()
MSVCRT! 77c413b0()
VORBISFILE! 10001d1d()
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On 6/15/05, Steve Russell <srussell@innernet.net>
wrote:
> I am having one frustrating time trying to decipher why ov_read is failing
> in my MFC/C++ application, and I see in Google results that others have had
> difficulty as well.  These google discussions generally involve libraries,
> dll's and linking options, as though there are perhaps some basic
> incompatibilities between ogg vorbis and win32 and/or MFC/C++.  Very
> confusing.
There can be linking problems, they're not fundamental
incompatibilities - you just have to link to the right runtime, like
with any other libraries
>  
> If I pass fopen a fictitious filename, ov_open returns the proper error. 
> However, if I pass a legitimate filename, ov_open crashes without giving me
> any apparent clue.
ov_open doesn't take filenames. So I'm not sure what you were trying
to say. Try doing a debug build, so you can get some information about
where things went wrong.

Mike

On 2005-06-15 at 06:55:25 Steve Russell wrote:
> "Unhandled exception in Room 101.exe (NTDLL.DLL): 0xC0000005: Access
Violation."
> OggVorbis_File vf;
>  FILE* pFile;
>  pFile = fopen("test.ogg", "rb");
>  if(!pFile)
>   AfxMessageBox("fopen failed");
>  //    here's where I get the exception
>  int err = ov_open(pFile, &vf, NULL, 0);
If this is your actual code, and the test.ogg file doesn't exist, then
it is logical that you get an access violation: you are passing a NULL
pointer in the pFile parameter to ov_open.  Don't do that. :)

OTOH, if you still get exceptions even when you pass a correct file
pointer, then it's quite difficult to see what's going wrong without
being able to reproduce it.  Therefore, could you please send the
exact source code you're using, if it's not too large (or proprietary
;), or put it up for download somewhere?  Also, the exact versions of
the vorbis libraries and/or DLLs you're using would be nice.
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----- Original Message ----- 
From: "Steve Russell" <srussell@innernet.net>
To: "Dimitry Andric" <dimitry@andric.com>
Sent: Wednesday, June 15, 2005 6:02 PM
Subject: Re: [Vorbis-dev] lack of detail for exception in ov_open

> ----- Original Message ----- 
> From: "Dimitry Andric" <dimitry@andric.com>
> To: "Steve Russell" <srussell@innernet.net>
> Cc: <vorbis-dev@xiph.org>
> Sent: Wednesday, June 15, 2005 8:25 AM
> Subject: Re: [Vorbis-dev] lack of detail for exception in ov_open
> On 2005-06-15 at 06:55:25 Steve Russell wrote:
>
>> "Unhandled exception in Room 101.exe (NTDLL.DLL): 0xC0000005:
Access
>> Violation."
>
>> OggVorbis_File vf;
>>  FILE* pFile;
>>  pFile = fopen("test.ogg", "rb");
>>  if(!pFile)
>>   AfxMessageBox("fopen failed");
>>  //    here's where I get the exception
>>  int err = ov_open(pFile, &vf, NULL, 0);
>
> If this is your actual code, and the test.ogg file doesn't exist, then
> it is logical that you get an access violation: you are passing a NULL
> pointer in the pFile parameter to ov_open.  Don't do that. :)
>
> OTOH, if you still get exceptions even when you pass a correct file
> pointer, then it's quite difficult to see what's going wrong
without
> being able to reproduce it.  Therefore, could you please send the
> exact source code you're using, if it's not too large (or
proprietary
> ;), or put it up for download somewhere?  Also, the exact versions of
> the vorbis libraries and/or DLLs you're using would be nice.
----------------------
Okay and thanks.  Here is a summary of what I have to this point . . . .

// AudioFile.cpp: implementation of the CAudioFile class.

#include "stdafx.h"
#include "Room 101.h"
#include "AudioFile.h"
//#include "speex/speex.h" // included in AudioFile.h
#include "speex\speex_bits.h"
 . . .
#include "vorbis/codec.h"
#include "vorbis/vorbisfile.h"
 . . .
OggVorbis_File vf;
FILE* pFile;
pFile = fopen("verdes_2.ogg", "rb");

if(!pFile)
 AfxMessageBox("fopen failed");
else
 AfxMessageBox("fopen succeeded");

int err = 0;
err = ov_open(pFile, &vf, NULL, 0);
if(err == OV_EREAD )
 AfxMessageBox("OV_EREAD error");
if(err == OV_ENOTVORBIS )
 AfxMessageBox("OV_ENOTVORBIS error");
if(err == 0)
 ::Beep(1000,20);  // I'd love to hear this
ov_clear(&vf);

*******

I admit that I do not fully understand what all directories and files I need
to be using and possibly
where to locate them.  Presently, I have this arrangement, with "C:\Hand in
Hand\Room 101\" being
my exe's directory:

C:\Hand in Hand\Room 101\vorbisfile.dll
C:\Hand in Hand\Room 101\ogg.dll
C:\Hand in Hand\Room 101\vorbis.dll

C:\Hand in Hand\Room 101\ogg\config_types.h.in
C:\Hand in Hand\Room 101\ogg\Makefile.am
C:\Hand in Hand\Room 101\ogg\Makefile.in
C:\Hand in Hand\Room 101\ogg\ogg.h
C:\Hand in Hand\Room 101\ogg\os_types.h

C:\Hand in Hand\Room 101\vorbis\codec.h
C:\Hand in Hand\Room 101\vorbis\vorbisenc.h
C:\Hand in Hand\Room 101\vorbis\vorbisfile.dll
C:\Hand in Hand\Room 101\vorbis\vorbisfile.h
C:\Hand in Hand\Room 101\vorbis\vorbisfile.lib

Copied to these locations from:

C:\OggVorbis\libogg-1.1
C:\OggVorbis\libvorbis-1.0.1

I read this from someone else's post:

"Your project should include the project files for the static (or dynamic
if
you prefer) libs of ogg,
vorbis and vorbisfile; and should be dependent on all of them. You will need
to provide the paths to the 'ogg/include' dir and the
'vorbis/include' dir,
and maybe others. I can't remember off the top of my head. "

Can't say I'm comprehending all of that, but certainly wish I was.