Re: Beginner difficulty with first tutorial program

[Jochen Baier <Jochen Baier stud uni-karlsruhe de>]

Jonathan Hayward wrote:

> I've installed 2.4.9 under FC4, and when something else didn't work, 
> tried to compile and run the tutorial's sample program. I created test.c:
>
> #include <gtk/gtk.h>
>
> int main(int argc, char *argv[])
>     {
>     GtkWidget *window;
>     gtk_init(&argc, &argv);
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_main();
>     return 0;
>     }
>
> Then I compiled it with a Makefile:
>
> CC = gcc
>
> CFLAGS = -c -g -O2 -Wall `pkg-config --cflags gtk+-2.0`
>
> LIBS = -lm `pkg-config --libs gtk+-2.0`
>
> test: test.o
>     $(CC) test.o $(LIBS) -o test
>
> test.o: test.c
>     $(CC) $(CFLAGS) test.c
>
> According to the tutorial, this should get a blank 200x200 window. 
> When I ran it, however, it seemed to lag; a backtrace from gdb 
> indicated that I had [without seeing a window] got past the code that 
> should start the window, and into the event loop:
>
> Program received signal SIGINT, Interrupt.
> 0x005cb402 in __kernel_vsyscall ()
> (gdb) backtrace
> #0  0x005cb402 in __kernel_vsyscall ()
> #1  0x00b77cb9 in poll () from /lib/libc.so.6
> #2  0x0026a248 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
> #3  0x0026a6e3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
> #4  0x0070c1b5 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
> #5  0x080485aa in main (argc=1, argv=0xbfc52224) at test.c:9
>
> What should I be doing differently?


you should show the window

like that:

#include <gtk/gtk.h>

int main(int argc, char *argv[])
   {
   GtkWidget *window;
   gtk_init(&argc, &argv);
   window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   gtk_widget_show (window);
   gtk_main();
   return 0;
}

cu jochen