C GTK状态栏是如何工作的？什么'；我的代码怎么了？

我想有一个状态栏，所以我开始制作一个只有状态栏的小程序，这样我就可以看到它是如何工作的

现在，我只想能够得到一些文字，但它显示了一个随机字符，而不是

有人能看到我的代码有什么问题吗

#include <gtk/gtk.h>

int main (int argc, char *argv[]) {
  GtkWidget *window, *statusbar, *vbox;
  gchar *info;
  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_size_request(window, 250, -1);

  g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);

  statusbar = gtk_statusbar_new();

  /* stack for info messages */
  g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "1");
  g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "2");
  g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "3");

  /* stack for warning messages */
  g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "A");
  g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "B");
  g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "C");

  /* get id for the message at the top of the info stack? */
  guint id = gtk_statusbar_get_context_id(statusbar, "info");
  /* show the top message from the info stack ? */
  gtk_statusbar_push(statusbar, id, info);

  vbox = gtk_vbox_new(FALSE, 5);  
  gtk_box_pack_start_defaults(GTK_BOX (vbox), statusbar);
  gtk_container_add(GTK_CONTAINER(window), vbox);

  gtk_widget_show_all(window);
  gtk_main();
  return 0;
}

---

您声明了

GtkWidget*statusbar

，但是

gtk\u statusbar…

方法期望

GtkStatusbar*

：使用

gtk\u statusbar（statusbar）

强制转换它将删除警告。这不是一个大问题，因为该程序无论如何都会工作：最大的问题是您在使用

info

时没有初始化它

以下代码在此处按预期工作：

/* gcc -o status status.c $(pkg-config --cflags --libs gtk+-2.0) */

#include <gtk/gtk.h>

int main (int argc, char *argv[]) {
    GtkWidget *window, *statusbar, *vbox;
    gchar *info;
    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_widget_set_size_request(window, 250, -1);

    g_signal_connect(G_OBJECT(window), "destroy",
                     G_CALLBACK(gtk_main_quit), NULL);

    statusbar = gtk_statusbar_new();

    /* stack for info messages */
    g_object_set_data(G_OBJECT(statusbar), "info", (gpointer)
                      "1");
    g_object_set_data(G_OBJECT(statusbar), "info",
                      (gpointer) "2");
    g_object_set_data(G_OBJECT(statusbar), "info",
                      (gpointer) "3");

    /* stack for warning messages */
    g_object_set_data(G_OBJECT(statusbar), "warning",
                      (gpointer) "A");
    g_object_set_data(G_OBJECT(statusbar), "warning",
                      (gpointer) "B");
    g_object_set_data(G_OBJECT(statusbar),
                      "warning", (gpointer) "C");

    /* get id for the message at the top of the
     * info stack? */
    guint id = gtk_statusbar_get_context_id(GTK_STATUSBAR(statusbar), "info");
    /* show the top message from the info stack
     * ? */
    info = "This was uninitialized";
    gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, info);

    vbox = gtk_vbox_new(FALSE, 5);
    gtk_box_pack_start_defaults(GTK_BOX
                                (vbox),
                                statusbar);
    gtk_container_add(GTK_CONTAINER(window),
                      vbox);

    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}

---

不是你没有的代码-里面没有

gtk\u statusbar\u pop

！酷！谢谢。现在让我们假设我希望状态栏显示警告消息2。那怎么办？我搞不懂这个推送/流行的概念是怎么工作的。哇。非常感谢你。你真的很在行！

/* gcc -o status status.c $(pkg-config --cflags --libs gtk+-2.0) */

#include <gtk/gtk.h>

int main (int argc, char *argv[]) {
    GtkWidget *window, *statusbar, *vbox;
    gchar *info;
    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_widget_set_size_request(window, 250, -1);

    g_signal_connect(G_OBJECT(window), "destroy",
                     G_CALLBACK(gtk_main_quit), NULL);

    statusbar = gtk_statusbar_new();

    /* stack for info messages */
    g_object_set_data(G_OBJECT(statusbar), "info", (gpointer)
                      "1");
    g_object_set_data(G_OBJECT(statusbar), "info",
                      (gpointer) "2");
    g_object_set_data(G_OBJECT(statusbar), "info",
                      (gpointer) "3");

    /* stack for warning messages */
    g_object_set_data(G_OBJECT(statusbar), "warning",
                      (gpointer) "A");
    g_object_set_data(G_OBJECT(statusbar), "warning",
                      (gpointer) "B");
    g_object_set_data(G_OBJECT(statusbar),
                      "warning", (gpointer) "C");

    /* get id for the message at the top of the
     * info stack? */
    guint id = gtk_statusbar_get_context_id(GTK_STATUSBAR(statusbar), "info");
    /* show the top message from the info stack
     * ? */
    info = "This was uninitialized";
    gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, info);

    vbox = gtk_vbox_new(FALSE, 5);
    gtk_box_pack_start_defaults(GTK_BOX
                                (vbox),
                                statusbar);
    gtk_container_add(GTK_CONTAINER(window),
                      vbox);

    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}

gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, "First message");
// Now the statusbar shows "First message"
gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, "Second message");
// Now the statusbar shows "Second message"
gtk_statusbar_pop(GTK_STATUSBAR(statusbar), id);
// Now the statusbar shows "First message"