#include <stdlib.h>
#include <stdio.h>
#include <string.h>

main(){
	FILE *stream;
	char line[256];
	
	putenv(
"MAIN_DIALOG=<hbox>"
"  <button ok></button>"
"  <button cancel></button>"
"</hbox>");
	
	stream = popen("gtkdialog --program=MAIN_DIALOG", "r");
	fgets(line, 255, stream);
	if (strstr(line, "OK") != NULL)
		printf("Precionaste el botón Aceptar.\n");
	else
		printf("Precionaste el botón Cancelar.\n");
	pclose(stream);
	
}