#include <gtk/gtk.h>
#include<string.h>
#include<stdio.h>
#include <stdbool.h>
#include<stdlib.h>
static GtkWidget *textlabel_question_no;
static GtkWidget *textlabel_answer1;
static GtkWidget *textlabel_answer2;
static GtkWidget *textlabel_answer3;
static GtkWidget *textlabel_answer4;
static GtkWidget *textlabel_question;
static GtkWidget *textlabel_timer;
static GtkWidget *textlabel_timeleft;
static GtkWidget *button_next;
static GtkWidget *window2;
static GtkWidget *window31;
static GThread *thread;
void show_info(GtkWidget *window2);
// thread for timer
static gpointer thread_Func(gpointer data)
{
// gdk_threads_enter();
int min=0,sec;//min=29
while(min > -1 )
{
sec = 10;
while(sec>=0)
{
sleep(1);
char* timer_text=malloc(sizeof(char)*40);
if(sec>9)
{
sprintf(timer_text,"%d : %d",min,sec);
}
else
{
sprintf(timer_text,"%d : 0%d",min,sec);
}
gtk_label_set_text(GTK_LABEL(textlabel_timer),timer_text);
sec--;
}
min--;
}
// gdk_threads_leave();
// gdk_threads_enter();
g_printf("in show_info\n");
GtkWidget *dialog;
dialog = gtk_message_dialog_new(GTK_WINDOW(window2),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_INFO,
GTK_BUTTONS_OK,
"Your Time is UP !!!\n Lets see the Result & Statistics...","title");
gtk_window_set_title(GTK_WINDOW(dialog), "Time Finished");
gint result=gtk_dialog_run(GTK_DIALOG(dialog));
switch(result)
{
case GTK_RESPONSE_OK:
gtk_widget_hide(window2);
g_printf("in show_info\n");
system("./result &");
//gtk_main_quit();
break;
}
//sleep(10);
gtk_widget_destroy(dialog);
/*
window31 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window31), GTK_WIN_POS_CENTER);
gtk_window_set_title(GTK_WINDOW(window31), "Examination Panel");
gtk_container_set_border_width(GTK_CONTAINER(window31),12);
gtk_window_set_resizable(GTK_WINDOW(window31),FALSE);
gtk_widget_set_size_request(window31,300,150);
gtk_widget_show_all(window31);
//sleep(10);
gdk_threads_leave();*/
return NULL;
}
static void next_question_label_change(GtkWidget *button_next,gpointer data)
{
g_printf("in button_next\n");
static int question_value=2;
char *question_label = malloc(sizeof(char)*50);
sprintf(question_label,"Question %d of 10.",question_value);
gtk_label_set_text(GTK_LABEL(textlabel_question_no),question_label);
if(question_value<10)
question_value++;
}
//For Submit button dialog box
static void test_submit_window(GtkWidget *button_next,GtkWidget *window2)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new(GTK_WINDOW(window2),
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_QUESTION,
GTK_BUTTONS_YES_NO,
"Are you sure to Submit the Test?");
gtk_window_set_title(GTK_WINDOW(dialog), "Submit Test Confirmation");
gint result = gtk_dialog_run (GTK_DIALOG (dialog));
switch(result)
{
case GTK_RESPONSE_YES:
system("./result &");
gtk_widget_hide(window2);
break;
case GTK_RESPONSE_NO:
break;
}
gtk_widget_destroy(dialog);
}
int
main (int argc,char *argv[])
{
GTimer *g_time;
GtkWidget *fixed;
GtkWidget *radio1,*radio2,*radio3,*radio4;
GtkWidget *button_submit;
GtkWidget *textlabel_title;
GtkWidget *image;
GtkWidget *image2;
GError *error = NULL;
GdkPixbuf *pixbuf;
GtkWidget *scrolled_window;
/* Secure glib */
if( ! g_thread_supported() )
g_thread_init( NULL );
//g_threads_init(NULL);
//g_thread_init(NULL);
/* Secure gtk */
gdk_threads_init();
/* Obtain gtk's global lock */
// intialiazation
gtk_init (&argc, &argv);
//window attributes position,size,title
window2 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window2), GTK_WIN_POS_CENTER);
gtk_window_set_title(GTK_WINDOW(window2), "Examination Panel");
gtk_container_set_border_width(GTK_CONTAINER(window2),12);
gtk_window_set_resizable(GTK_WINDOW(window2),FALSE);
gtk_widget_set_size_request(window2,800,450);
button_next = gtk_button_new_with_label("Next>>");
button_submit = gtk_button_new_with_label("Submit");
textlabel_title = gtk_label_new("-> TECHNICAL EXAM <-");
textlabel_question = gtk_label_new("question placed here");
textlabel_question_no = gtk_label_new(" Question 1 of 10.");
textlabel_answer1 = gtk_label_new(" answer 1");
textlabel_answer2 = gtk_label_new(" answer 2");
textlabel_answer3 = gtk_label_new(" answer 3");
textlabel_answer4 = gtk_label_new(" answer 4");
textlabel_timer = gtk_label_new("30:00");
textlabel_timeleft = gtk_label_new("Time Left :");
//radio button for option
radio1 = gtk_radio_button_new_with_label (NULL , "A. ");
radio2 = gtk_radio_button_new_with_label_from_widget
(GTK_RADIO_BUTTON(radio1),"B.");
radio3 = gtk_radio_button_new_with_label_from_widget
(GTK_RADIO_BUTTON (radio1),"C. ");
radio4 = gtk_radio_button_new_with_label_from_widget
(GTK_RADIO_BUTTON (radio1),"D. ");
// For image
pixbuf = gdk_pixbuf_new_from_file_at_size
("/home/trilok/trantorlogo.png", 100, 100, &error);
if(!pixbuf)
{
g_print ("Error: %s\n",error->message);
g_error_free (error);
/* Handle error here */
}
image = gtk_image_new_from_pixbuf(pixbuf);
image2 = gtk_image_new_from_pixbuf(pixbuf);
g_object_unref (pixbuf);
//For Signals
g_signal_connect (window2, "destroy", G_CALLBACK (gtk_main_quit), NULL);
g_signal_connect (button_next,"clicked",G_CALLBACK
(next_question_label_change), NULL);
g_signal_connect (button_submit,"clicked",G_CALLBACK(test_submit_window),window2);
//timer
// pthread_create(&pth,NULL,threadFunc,"foo");
/* Create new thread */
thread = g_thread_create( thread_Func,NULL,
FALSE,&error);
if( ! thread )
{
g_print( "Error: %s\n", error->message );
return( -1 );
}
// For scrolled window
scrolled_window = gtk_scrolled_window_new (NULL, NULL);
gtk_container_set_border_width (GTK_CONTAINER (scrolled_window),10);
gtk_scrolled_window_set_policy
(GTK_SCROLLED_WINDOW
(scrolled_window)
,GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);
//fixed
fixed = gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window2), fixed);
gtk_widget_show(fixed);
gtk_scrolled_window_add_with_viewport
(GTK_SCROLLED_WINDOW(scrolled_window),textlabel_question);
gtk_widget_set_size_request(scrolled_window,580,150);
//scrolled border
gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_window),
GTK_SHADOW_IN);
gtk_scrolled_window_set_placement (GTK_SCROLLED_WINDOW (scrolled_window),
GTK_CORNER_TOP_LEFT);
gtk_fixed_put(GTK_FIXED(fixed), scrolled_window, 70, 110);
gtk_fixed_put(GTK_FIXED(fixed), image, 0, 0);
gtk_fixed_put(GTK_FIXED(fixed), image2, 0, 510);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_title, 300, 20);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_timeleft, 610, 70);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_timer, 690, 70);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_question_no, 65, 70);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_answer1,170, 300);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_answer2,170, 350);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_answer3,170, 400);
gtk_fixed_put(GTK_FIXED(fixed), textlabel_answer4,170, 450);
gtk_fixed_put(GTK_FIXED(fixed), radio1, 100,300);
gtk_fixed_put(GTK_FIXED(fixed), radio2, 100,350);
gtk_fixed_put(GTK_FIXED(fixed), radio3, 100,400);
gtk_fixed_put(GTK_FIXED(fixed), radio4, 100,450);
gtk_fixed_put(GTK_FIXED(fixed), button_next,620, 500);
gtk_fixed_put(GTK_FIXED(fixed), button_submit,690, 500);
gtk_widget_show_all(window2);
//gdk_threads_enter();
GDK_THREADS_ENTER();
gtk_main();
/* Release gtk's global lock */
//gdk_threads_leave();
GDK_THREADS_LEAVE();
return 0;
}
实际上我正在考试模拟器上制作一个计时器。我的计时器工作正常，但问题是当计时器转到 0:00 时我必须打开一个对话框。我已经实现了线程来制作计时器。问题是，当计时器转到 0:00 时，就会出现段错误。 gdk 线程不允许对 gtk 小部件进行任何调用。
感谢您提前提供的帮助。 如果有人纠正上面的代码并使其实现，我们将不胜感激
最佳答案
- 不清楚您是否使用了
gdk_threads_enter()，因为有一堆注释掉的调用和一个宏。 GTK+ 不是线程安全的，您尝试的方法不是正确的方法。 - 您确实不需要为此使用线程，只需使用 glib 计时器即可。
- 您正在从
timer_text分配中泄漏内存；gtk_label_set_text()不会转移文本缓冲区的所有权(请注意，它是const)。
关于c - GDK 线程不允许 gtk 更改(制作计时器)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18831168/