使用GTK获取关键信息

Posted 2021-02-24

/*! 
 * rief GTK Program to get information about key pressed
 * author Fabien Arcellier
 * 
 * To compil with GTK : gcc -Wall `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0` -o key_tool -g key_tool.c
 */
#include <gtk/gtk.h>
 
static void destroy (GtkWidget*, gpointer);
static gboolean key_press_event (GtkWidget*, GdkEventKey*, gpointer);
 
int main(int argc, char *argv[])
{
  GtkWidget *window = NULL, *label= NULL;
 
  gtk_init(&argc, &argv);
 
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Key Pressed tool");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);
  gtk_widget_set_size_request (window, 300, 300);
  gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
 
  label = gtk_label_new ("Press a key");
  gtk_label_set_selectable (GTK_LABEL (label), TRUE);
 
  gtk_container_add (GTK_CONTAINER (window), label);
  gtk_widget_show_all (window);
 
  g_signal_connect (G_OBJECT (window), "key_press_event", G_CALLBACK (key_press_event), NULL);
  g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL);
 
  gtk_main();
  return 0;
}
 
/*!
 * rief Close application
 */
static void destroy (GtkWidget *window, gpointer data) 
{
  gtk_main_quit();
}
 
/*!
 * rief Display information about key pressed in label
 */
static gboolean key_press_event(GtkWidget *window, GdkEventKey *event, gpointer data)
{
  char key_event_info[1024] = "";
  char *event_string = NULL;
  GtkWidget *label = NULL;
 
  if (event -> string != NULL)
  {
    event_string = event -> string;
  }
  else
  {
    *event_string = '';
  }
 
  sprintf(key_event_info, "Key

 
    send_event : %d
 
    time : %d 
 
    state : %d 
 
    keyval : %d 
 
    length : %d 
 
    string : %s 
 
    hardware_keycode : %d 
 
    group : %d 
 
    is_modifier %d",
    event -> send_event,
    event -> time,
    event -> state,
    event -> keyval,
    event -> length,
    event_string,
    event -> hardware_keycode,
    event -> group,
    event -> is_modifier
  );
 
  label = gtk_bin_get_child (GTK_BIN (window));
  gtk_label_set_text (GTK_LABEL (label), key_event_info);
 
  return TRUE;
}