C GTK+ 启动时的事件信号

Question

我正在写一个倒计时器。它由一个带有标签的窗口组成，其中显示时间。 “timer()”(在下面的代码中)作为线程生成。这在linux环境下工作得很好，但据我所知GTK不支持windows下的多线程(如果我错了请纠正我)。是否可以在不使用线程的情况下生成“timer()”，例如当 main_window 出现时调用信号？

#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <gtk/gtk.h>

GtkWidget *window;
GtkWidget *label;
pthread_t timer_thread;

void* timer()
{
    while(1)
    {
        // some code here to calculate time
        gtk_label_set_markup ((GtkLabel*)label, time_c);
        sleep(1);
    }
}

static gboolean delete_event( GtkWidget *widget, GdkEvent *event, gpointer data )
{
    return FALSE;
}

static void destroy( GtkWidget *widget, gpointer data )
{
    gtk_main_quit ();
}

int main(int argc, char **argv)
{
    g_thread_init(NULL);
    gdk_threads_init();  
    gdk_threads_enter();
    gtk_init (&argc, &argv);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    g_signal_connect (window, "delete-event", G_CALLBACK (delete_event), NULL);
    g_signal_connect (window, "destroy", G_CALLBACK (destroy), NULL);

    label = gtk_label_new("");

    gtk_container_add (GTK_CONTAINER (window), label);
    gtk_widget_show (label);
    gtk_widget_show (window);

    pthread_create(&timer_thread, NULL, timer, NULL);   

    gtk_main ();
    gdk_threads_leave();
    return 0;
}

我尝试这样做，timer() 正确生成，但主窗口从未出现:

    static void timer( GtkWidget *widget, gpointer data )
    {
        while(1)
        {
            g_print("something"); //for checking
            // some code here to calculate time
            gtk_label_set_markup ((GtkLabel*)label, time_c);
            sleep(1);
        }
    }

int main(int argc, char **argv)
{
    g_signal_connect (window, "show", G_CALLBACK (timer), NULL);
}

提前致谢!

Answer 1

为此，您最好使用计时器。查看g_timeout_add 。这里有一个例子:GTK+ events and signals .