c - 如何使用G_CALLBACK()在没有callig新功能的情况下在gtk中连接g_signal_connect

所以我有这样的代码，我的主要

int main(int argc, char **argv)
{
button = GTK_WIDGET( gtk_builder_get_object( builder, "button2" ) );
g_signal_connect(button, "clicked", G_CALLBACK (show_dialog), NULL);
}

然后我有show_dialog这样

static void
show_dialog ( GtkWidget *button,
          gint       response_id,
          gpointer   user_data )
{
GtkBuilder *builder;
GtkWidget *filechoosedialog;

builder = gtk_builder_new();
gtk_builder_add_from_file( builder, GLADE_FILE, NULL );
fiilechoosedialog = GTK_WIDGET( gtk_builder_get_object(
                                builder,
                                "filechooserdialog1" ) );
/* Run dialog */
gtk_dialog_run( GTK_DIALOG( filechoosedialog ) );
gtk_widget_hide( filechoosedialog );

gtk_builder_connect_signals( builder, NULL );

g_object_unref( G_OBJECT(builder));
}

因此，现在我想添加此部分以显示对话框，以便可以检测何时按下“打开”和“取消”按钮。在Glade中，我将“打开”按钮的响应ID设置为-5，将“取消”设置为-6，这与GTK_RESPONSE_OK和GTK_RESPONSE_CANCEL对应，但是当我按“打开”按钮时，我不会执行g_print

switch (response_id)
{
  case GTK_RESPONSE_OK:

        g_print ("Selected filename: %s\n", filename);
        g_print ("response idd: %d\n", response_id);
     break;
  default:

     break;
}

gtk_widget_destroy（GTK_WIDGET（filechoosedialog））;

最佳答案

GtkFileChooserDialog是GtkDialog的子类，因此使用gint gtk_dialog_run(GtkDialog *dialog);应该可以，它返回响应代码。

// get hold of the return value of `gtk_run_dialog(...)`, lookup the type
response_id = gtk_dialog_run( GTK_DIALOG( filechoosedialog ) );
switch (response_id)
{
  case GTK_RESPONSE_OK:
        g_print ("Selected filename: %s\n", filename);
        g_print ("response idd: %d\n", response_id);
     break;
  default:
        g_print ("do'h! no file selected!\n");
     break;
}

// I am pretty sure you do not need this, this approach does not use the `updated` signal
gtk_builder_connect_signals( builder, NULL );