linux 下从头再走 GTK+-3.0 (三)之前我们为窗口添加了一个按钮，接下来让这个按钮丰富一点。并给窗口加上图标。
首先创建 example3,c 的源文件。
#include <gtk/gtk.h>static void activate(Gtkapplication *app , gpointer data);//从文件中加载一张图片GdkPixbuf *create_pixbuf(const char *image_name); int main(int argc , char **argv){ GtkApplication *app; int app_status; app = gtk_application_new("org.rain.gtk" , G_APPLICATION_FLAGS_NONE); g_signal_connect(app , "activate" , G_CALLBACK(activate) , NULL); app_status = g_application_run(G_APPLICATION(app) , argc , argv); g_object_unref(app); return app_status;}static void activate(GtkApplication *app , gpointer data){ GtkWidget *window; GdkPixbuf *icon; GtkWidget *button; GtkWidget *button_box; window = gtk_application_window_new(app); gtk_window_set_title(GTK_WINDOW(window) , "icon test"); gtk_window_set_default_size(GTK_WINDOW(window) , 200 , 200); gtk_window_set_position(GTK_WINDOW(window) , GTK_WIN_POS_CENTER); //创建图标控件icon icon = create_pixbuf("icon.png"); //为窗口设置图标 gtk_window_set_icon(GTK_WINDOW(window) , icon); //创建一个带有加速键的按钮，按住 Alt 不放，再按C，即相当于点击按钮 button = gtk_button_new_with_mnemonic("_Close"); //为按钮设置一个信息提示条 gtk_widget_set_tooltip_text(button , "Click button to quit."); button_box = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL); gtk_container_add(GTK_CONTAINER(button_box) , button); gtk_container_add(GTK_CONTAINER(window) , button_box); g_signal_connect_swapped(button , "clicked" , G_CALLBACK(gtk_widget_destroy) , window); g_object_unref(icon); gtk_widget_show_all(window);}GdkPixbuf *create_pixbuf(const char *image_name){ GdkPixbuf *pixbuf; //加载图片文件，第二个参数设置错误变量的，不需要则设为 NULL pixbuf = gdk_pixbuf_new_from_file(image_name , NULL); if(!pixbuf) { perror("gdk_pixbuf_new_from_file()\n"); return NULL; } return pixbuf;}
编译并运行：
gcc example.c `pkg-config --cflags --libs gtk+-3.0`./a.out
结果：