update : for some reason, the example I tried that *didn't* work must have
been different from what I sent to the list, because that works fine..
what I'm really trying to do is a little more involved.. I'm screwing
around with GTK+ and I wanted to call a messagebox function that I wrote
with a message saying what button I clicked on.. the callback function
takes a paramater of type gpointer, I cast the string "button 1" to
gpointer in the function call, then cast it back to (char *) in the
sprintf() call
i.e.:
sprintf(string, "you pressed %s", (char *) data);
segfaults
buuuuut
printf("you pressed %s", (char *) data);
works fine.. the GTK+ tutorial uses the same example, but they use g_print
instead of printf.. the point is that both of those work, but sprintf
won't.. sprintf *DID* work inthe example i sent to the list, don't ask me
why it didn't the first time ;p
anyway, I'm just screwing around, learning gtk+ and I wanted to solve this
problem.. I'm more familiar wtih c++ than with C but I'm converting so
bear with me :)
On Tue, 25 May 1999, Michael Yuan wrote:
>
> Might sound obvious ... But have you allocated memory for your string
> pointer "string2"?
>
> Michael
>
> On Tue, 25 May 1999, Justin Ryan [PHT] wrote:
>
> > hey guys, any idea why my program would segfault whenever I try to use
> > sprintf? example program I wrote to try and find my error:
> >
> > #include <stdio.h>
> >
> > int main()
> > {
> > char *string;
> > char *string2;
> >
> > string = "blah";
> >
> > sprintf(string2, "%s is the string", string);
> >
> > printf("the string says %s", string2);
> >
> > return (0);
> > }
> >
> > this segfaults, if i just use printf with string it works fine.. any
> > input?
> >
> > -Justin
> >
> > |--------------------------------------------------
> > |Justin Ryan
> > |Developer Relations / Support Associate
> > |Pacific HiTech / TurboLinux
> > |http://www.turbolinux.com / [EMAIL PROTECTED]
> > |WebMaster, PCHelp - http://computers.iwz.com
> > |[EMAIL PROTECTED]
> > |--------------------------------------------------
> >
> > ---------------------------------------------------------------------------
> > Send administrative requests to [EMAIL PROTECTED]
> >
>
|--------------------------------------------------
|Justin Ryan
|Developer Relations / Support Associate
|Pacific HiTech / TurboLinux
|http://www.turbolinux.com / [EMAIL PROTECTED]
|WebMaster, PCHelp - http://computers.iwz.com
|[EMAIL PROTECTED]
|--------------------------------------------------
---------------------------------------------------------------------------
Send administrative requests to [EMAIL PROTECTED]
