#include <gtk/gtk.h>
 #include <stdio.h>
 #include <stdlib.h>

 /*
  *点击了关闭按钮之后的回调函数
  *gtk_main_quit();结束main函数循环，退出process
  *TURE:表示事件已处理禁止进一步传播，从而取消关闭操作；
  *FALSE:事件消息进一步向上传播,从而关闭窗口
  */
 gint delete_event( GtkWidget *widget, GdkEvent *event, gpointer data )
 {
     gtk_main_quit ();//如果不要该语句，当return TURE时，程序没有任何反应。return FALSE时，仅关闭窗口，而不会退出程序
     return FALSE;
 }

 /*helloWorld函数，作用是弹出一个dialog*/
 void helloWorld (GtkWidget *wid, GtkWidget *win)
 {
     GtkWidget *dialog = NULL;
     //系统常量GTK_MESSAGE_INFO是在说明我们想要生成info对话框。系统常量GTK_BUTTONS_CLOSE将生成一个”关闭”按钮，最后一个参数是我们想要在对话框中显示的文字。
     dialog = gtk_message_dialog_new (GTK_WINDOW (win), GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_CLOSE, "hello world");
     gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);//显示在屏幕*
     gtk_dialog_run (GTK_DIALOG (dialog));
     gtk_widget_destroy (dialog);
 }

 /*nihaoshijie函数，作用是弹出一个dialog*/
 void nihaoshijie (GtkWidget *wid, GtkWidget *win)
 {
     GtkWidget *dialog = NULL;
     dialog = gtk_message_dialog_new (GTK_WINDOW (win), GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_OK_CANCEL, "nihaoshijie");
     gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
     gtk_dialog_run (GTK_DIALOG (dialog));
     gtk_widget_destroy (dialog);
 }

 /*主函数*/
 int main( int argc, char *argv[])
 {
     GtkWidget *window;//定义窗口
     GtkWidget *button1;//定义button
     GtkWidget *button2;//定义button
     GtkWidget *hbox;//定义hbox

     gtk_init(&argc, &argv);//初始化

     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);//创建标准窗口
     gtk_window_set_title (GTK_WINDOW (window), "my frist gtk+ program!");//设置窗口title
     gtk_window_set_default_size(GTK_WINDOW(window),,);//设置窗口大小

     gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);
     g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(delete_event),NULL);//创建信号连接，点击窗口上“关闭”按钮，调用delete_event函数

     hbox = gtk_hbox_new(TRUE,);//创建box
     gtk_container_add (GTK_CONTAINER (window), hbox);//将box添加到窗口

     button1 = gtk_button_new_with_label("hello world!");//创建按钮
     g_signal_connect(G_OBJECT(button1),"clicked",G_CALLBACK(helloWorld),NULL);//创建信号连接，clicked button时，调用helloWorld函数
     gtk_box_pack_start(GTK_BOX(hbox),button1,TRUE,FALSE,);//将按钮添加到box

     button2 = gtk_button_new_with_label("nihao shijie!");//创建按钮
     g_signal_connect(G_OBJECT(button2),"clicked",G_CALLBACK(nihaoshijie),NULL);//创建信号连接，clicked button时，调用nihaoshijie函数
     gtk_box_pack_start(GTK_BOX(hbox),button2,FALSE,FALSE,);//将按钮添加到box

     //点击窗口上面的关闭按钮时，退出程序。实现的机能跟g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(delete_event),NULL);一样
     //g_signal_connect_swapped(G_OBJECT(window),"delete_event",G_CALLBACK(gtk_main_quit),NULL);

     //显示控件，自顶向下。不然窗口出来了，按钮没出来
     gtk_widget_show(button1);
     gtk_widget_show(button2);
     gtk_widget_show(hbox);
     gtk_widget_show(window);
     gtk_main();

     ;
 }