1
那么,我基本上是新的Gtk,我将一个结构作为参数发送到回调函数,当用户单击该按钮时将会启动该函数。当我试图获得它的价值时,它不能正确填充它们,我不知道为什么。Gtk + 3在C.不能在回调函数中正确转换
计数器数据结构有以下几点:
typedef struct{
int flag;
GtkWidget* textview;
GtkWidget* label;
gchar* test;
} Counter_data;
和我一块所谓的功能是这样的:
static void start_counter(GtkWidget *btn, gpointer data){
int counter = 59;
gchar* tiempo;
g_print("starting/restarting counter\n");
gtk_button_set_label((GtkButton*)btn, "Started counting");
while(gtk_events_pending()) gtk_main_iteration();
while(1){
sleep(1);
tiempo = get_minutes(counter++);
g_print(tiempo);
g_print("%d\n",((Counter_data*) data)->flag);
/* gtk_label_set_text((GtkLabel*)((Counter_data*) data)->label, "testing2"); */
while(gtk_events_pending()) gtk_main_iteration();
}
}
在我的主要过程中,我把这个:
Counter_data counter_data;
window = gtk_application_window_new (app);
gtk_window_set_title (GTK_WINDOW (window), "Pomodoro 0.1");
gtk_window_set_default_size (GTK_WINDOW (window), ((Screen_size *) user_data)->x, ((Screen_size *) user_data)->y);
parentBox = gtk_box_new(FALSE, 0);
btn_box = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
textview = gtk_text_view_new();
label_time = gtk_label_new(NULL);
counter_data.flag = 0; //we are just starting the counter.
counter_data.textview = textview;
counter_data.label = label_time;
counter_data.test = "testing...";
gtk_box_pack_start(GTK_BOX(parentBox), btn_box, TRUE, TRUE, 0);
gtk_box_pack_start(GTK_BOX(parentBox), textview, TRUE, TRUE, 0);
gtk_box_pack_start(GTK_BOX(parentBox), label_time, TRUE, TRUE, 0);
btn = gtk_button_new_with_label("Start counting");
g_signal_connect(btn, "clicked", G_CALLBACK(start_counter),&counter_data);
当我在控制台中打印标志的值
g_print("%d\n",((Counter_data*) data)->flag);
它打印垃圾或地址,我不知道了。我说,棉短绒一切都很好:S
counter_data被分配在堆栈中。当按钮被按下时,你确定它仍在范围内吗?如果你在这里有一个最小的完整的测试用例,我可以看到自己,但... – jku
不是答案(jku说的可能是正确的),但是:你的计数器应该是线程或'g_timeout_add()'回调;这将避免需要在回调中抽取事件。 – andlabs