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From: dxg@cai.com
Newsgroups: comp.windows.ms.programmer
Subject: HELP! Calling fopen() in DLL
Message-ID: <394.28314261@cai.com>
Date: 15 May 91 14:14:57 GMT
Organization: Computer Associates International
Lines: 48


First some info: I am using MS-C 6.0a and MS-C 3.0a.

I am calling a function from a .exe that is in a DLL.  This
function does an fopen() and then returns a FILE *.  Within the DLL
I am able to fprintf() to the file, but when I try to call
fprintf() from my .exe it fails, with the following pop up box
in CodeView: Trap 13 (0DH) - General Protection Fault

Am I doing something wrong or is impossible to call fopen() from within
a DLL and return the FILE * to the exe?

basic function in DLL:

FILE *my_fopen( char *psFileName, char *psMode )
{
	FILE *pFile;
	pFile = fopen( psFileName, psMode );
	if( pFile != NULL )
      	  fprintf( pFile, "\n This works in the DLL" );
	return( pFile );
}

basic function in .exe called from WinMain():

int my_func()
{
	FILE *pFile;
	pFile = my_fopen( "file.tmp", "w" );
	if( pFile != NULL )
	{
		fprintf( pFile, "\n This does not work!, get CVW pop up box!" );
                fclose( pFile );
	}	
}

The examples above may have syntax errors, but they should help
your understanding of my problem.

I do not get the chance to read news that often, so please mail me
your responses.

Many many thanks in advance.
-- 
Dean Grammas..............................................dxg@cai.com

   "All I ask is a chance to prove that money can't make me happy."
.....................................................................