gtk学习笔记03 使用button和label

1. 本篇笔记基于油管大神的博客学习https://prognotes.net/2016/03/gtk-3-c-code-hello-world-tutorial-using-glade-3/ 连接

2. 使用glade拖拽一个界面出来

   1. 界面包含一个window，一个fixed，两个label和一个button
      保存为glades/03class/myglade.glade
      

3. 编写main.cpp

       #include <gtk/gtk.h>
       #include <string.h>
       #include <string>
       using namespace std;
   
       void on_window_main_destroy() {
           gtk_main_quit();
       }
   
       GtkWidget *labelHelloText;
       GtkWidget *labelHelloCount;
       void on_button_count_clicked() {
           static int count = 0;
           string text = "helloword";
           count ++;
           gtk_label_set_text(GTK_LABEL(labelHelloCount), to_string(count).c_str());
           gtk_label_set_text(GTK_LABEL(labelHelloText), text.c_str());
       }
   
       int main(int argc, char **argv) {
           GtkBuilder *builder;
           GtkWidget *window;
           gtk_init(&argc, &argv);
           builder = gtk_builder_new();
   
           char* filePath = "glades/03class/myglade.glade";
           gtk_builder_add_from_file(builder, filePath, NULL);
           gtk_builder_connect_signals(builder, NULL);
   
           window = GTK_WIDGET(gtk_builder_get_object(builder, "window_main"));
           g_signal_connect(window, "delete_event", on_window_main_destroy, NULL);
           labelHelloText = GTK_WIDGET(gtk_builder_get_object(builder, "lbl_hello"));
           labelHelloCount = GTK_WIDGET(gtk_builder_get_object(builder, "lbl_count"));
   
           GtkWidget *btn = GTK_WIDGET(gtk_builder_get_object(builder, "btn_hello"));
           {   // 这里连接信号是因为，c++里有命名粉碎机制，所以从ui文件拿不到绑定的信号回调函数
               // 在 C 里应该没问题的
               g_signal_connect(btn, "clicked", on_button_count_clicked, NULL);
               g_signal_connect(window, "delete_event", gtk_main_quit, NULL);
           }
   
           g_object_unref(builder);
           gtk_widget_show_all(window);
           gtk_main();
           return 0;
       }
   

4. 编译运行就行了