[Dev-C++] why that line is not executed(2)?

[gfu <gf...@pu...>]

I use the "New project" to creat a GTK+ project,and then compile and run it success!but the line  is not executed when step by debug: gtk_init (&_argc, &_argv);why?

#include <stdlib.h>
#include <gtk/gtk.h>
#include <windows.h>

GtkWidget *win;
GtkWidget *vbox;


static void
HelloWorld ()
{
    GtkWidget *dialog;

    dialog = gtk_message_dialog_new (GTK_WINDOW (win),
      GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_CLOSE,
      "Hello World!");
    gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}


int WINAPI
WinMain (HINSTANCE hThisInstance,
         HINSTANCE hPrevInstance,
         LPSTR lpszArgument,
         int nFunsterStil)
{
    GtkWidget *button;

    /* Initialize GTK+ */
    g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING,
      (GLogFunc) gtk_false, NULL);
    gtk_init (&_argc, &_argv);
    g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING,
      g_log_default_handler, NULL);


    /* Create the main window */
    win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_container_set_border_width (GTK_CONTAINER (win), 8);
    gtk_window_set_title (GTK_WINDOW (win), "Hello World");
    gtk_window_set_position (GTK_WINDOW (win), GTK_WIN_POS_CENTER);
    gtk_widget_realize (win);
    g_signal_connect (win, "destroy", gtk_main_quit, NULL);


    /* Create a vertical box with buttons */
    vbox = gtk_vbox_new (TRUE, 6);
    gtk_container_add (GTK_CONTAINER (win), vbox);

    button = gtk_button_new_from_stock (GTK_STOCK_DIALOG_INFO);
    g_signal_connect (button, "clicked", HelloWorld, NULL);
    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);

    button = gtk_button_new_from_stock (GTK_STOCK_CLOSE);
    g_signal_connect (button, "clicked", gtk_main_quit, NULL);
    gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);


    /* Enter the main loop */
    gtk_widget_show_all (win);
    gtk_main ();
    return 0;
}