Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!samsung!emory!mephisto!mcnc!rti!olympus!kk4fs!deadog
From: deadog@kk4fs.UUCP (Dead Dog)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Help needed for sharing common data between programs
Message-ID: <Za01N1w162w@kk4fs.UUCP>
Date: 17 Aug 90 02:33:46 GMT
References: <1990Aug9.042244.6@ux1.cso.uiuc.edu>
Distribution: comp.os.msdos.programmer
Organization: KK4FS - Free Speech Forum, +1 615 283 0864 for BBS
Lines: 31

klg0582@uxa.cso.uiuc.edu (Ken-Huang Lin) writes:

> I would like to have some "global variables" remain alive even after the
> program ends so that the next program can access them. I tried to set
> environment variables inside the program using
>    system("set v=...");
> in Turbo C. Unfortunately, the effect is only local to that program. Is
> there any way to set the global environment variables in a program? Or is
> there a better way to serve the same purpose?

There is a way you can search backward through memory blocks and find the 
"real" environment table, but there is a much better way.  Write the 
variables into a file...
   int write_vars()
   {
     FILE *f;
     f=fopen("globvar.dat","wb");
     if (f==NULL) return 0;        /* error creating file */
     fprintf(f,"%d\n",v);
     fprintf(f,"%s\n",misc_string);
     /* ... */
     fclose(f);
   }
Then read them in with your second program.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"The laugh of the king was clear       :Dead Dog  (Robey)
and strong, so out of fear the         4 @6555 (wwivnet)
crowd laughed along." -Tony Banks      ..!rti!tijc02!kk4fs!deadog