mysql_server_init embedded in a DLL?

Derick Smith Wed, 26 Feb 2003 06:36:46 -0800

Hi!

I am trying to create a DLL that will hide embedded mySQL functions for use with VB. I am using mysqlserver.lib. I am able to compile and execute the following code. This has to be done in C because VB is too slow :-(

If mysql_server_init function is run in the DLL from Visual Basic. I get the following error message: "..referenced memory at "0x000000". The memory could not be read".

Without the mysql_server_init function it will run correctly. It will also run correctly when this is compiled as a .lib file linked to a C program.

Is it possible to embed mysql_server_init in a DLL? (So the DLL can be used in VB)

Thanks in advance for any responses.

Thanks
Eric

header1.h

#define GPAPI __stdcall

header2.h

typedef unsigned long DBS;
#define NULLDBS  (DBS)0

api.c

GPAPI DBS dbNewSet (char * basedir, char * datadir, char * dbname)
{
        return NewSet(basedir,datadir,dbname);
}

newset.c

extern DBS NewSet(char * basedir, char * datadir, char * dbname)
{
        DBSET* pSet = CreateSet();
        char    *args[3];
        char strArgs[3][1024];
        int iRtn;
        int argc = 3;

        strcpy(strArgs[0],"this_program");
        sprintf(strArgs[1],"--basedir=%s",basedir);
        sprintf(strArgs[2],"--datadir=%s",datadir);
        args[0]= strArgs[0];
        args[1]= strArgs[1];
        args[2]= strArgs[2];

/* If I comment out this line of code,
the DLL will run correctly.
If mysql_server_init function is run in the DLL. I get the following
error message: "..referenced memory at "0x000000". The
memory could not be read" */
        iRtn = mysql_server_init(3, args, server_groups);

        if (pSet ==0 ) return NULLDBS;
        memset(pSet, 0, sizeof(DBSET)); /* Zero the structure.        */
   pSet->size  = sizeof(DBSET);/* Assign structure size.     */
   pSet->magic = DBS_MAGIC;  /* Assign magic number.       */

        return (DBS)(void*)pSet;
}

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mysql_server_init embedded in a DLL?

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