Vorbis dev - Nov 2004 - an excecute error

this it is the first time that I program with ogg libraries (I am a beginner).  
it has happened me an error, the code is the following one:
/*********************************************/
OggVorbis_File  *musica=NULL;
FILE *archiv =NULL;

archiv = fopen("prueba.ogg","r");
if(archiv==NULL) 
	exit(0);
int falla = ov_open(archiv,musica,NULL,0);//aca se produce el error
/*********************************************************************/

this is a messaje of windows (win98SE):
unhandled exception in intento.exe (KERNEL32.dll):0xC0000005: Access Violation

this is a messaje of MSVC(MSVC6.0):
Loaded 'C:\intento\Debug\vorbis.dll', no matching symbolic information
found.
Loaded 'C:\WINDOWS\SYSTEM\KERNEL32.DLL', no matching symbolic
information found.
Loaded 'C:\intento\Debug\ogg.dll', no matching symbolic information
found.
Loaded 'C:\intento\Debug\vorbisfile.dll', no matching symbolic
information found.
First-chance exception in intento.exe (KERNEL32.DLL): 0xC0000005: Access
Violation.
The program 'C:\intento\Debug\intento.exe' has exited with code 0 (0x0).

I hope they can help me to solve this error.  
goodbye and thanking ahead of time.
Masa, Chile.

On Sat, Nov 27, 2004 at 01:37:31PM -0700, apoyomutuo@spymac.com wrote:
> this it is the first time that I program with ogg libraries (I am a
beginner).
> it has happened me an error, the code is the following one:
> /*********************************************/
> OggVorbis_File  *musica=NULL;
> FILE *archiv =NULL;
> 
> archiv = fopen("prueba.ogg","r");
> if(archiv==NULL) 
> 	exit(0);
> int falla = ov_open(archiv,musica,NULL,0);//aca se produce el error
> /*********************************************************************/
Two things I notice that are wrong:

Ogg Vorbis is a binary format, so you should call fopen() with "rb" on
windows.

You are also passing a NULL value for musica, but this is where
ov_open() expects to store its decoder context. You must allocate
a structure and and pass its address instead of NULL. This is
likely the origin of the access violation.

Hope that helps,
 -r