dialog widget

[Marc Raeymaekers <marcraey freegates be>]

hello everybody,

I've developped a little application for my job (in a medical lab): to print barcodes on a thermal
transfert printer. The initial version was in text mode and worked fine, but my collegues had
preferences for a graphical version. Then I learn gtk+.
The graphical one works well since sept.99, but it cannot display error messages.

I think to add a dialog box created by a C function. But how to do to connect it in the if
statement. All the documentation about the dialog widget mentions the gtk_signal_connect().
It's fine when the event  parameter is a clicked button or so. It's certainly simple to resolve,
but I'm a newbie in gtk+ programming. 

Thus, how replace the fprintf() function by a dialog window?

Thanks for your help.


FILE *OpenPrinter(void)
{
  FILE *printer=NULL;
  if((printer=fopen(PRINTER_DEV,"w"))==NULL)
    {
    fprintf(stderr,"Impossible d'ouvrir le port imprimante !\n");
	    exit(2); 
     }
    
  return(printer);
}



Marc Raeymaekers
Laboratoire de Biologie clinique
C.H.F. Rabelais
Brussels
Belgium