GTK+-3.0编程 (三) 让这个按钮丰富一点，并给窗口加上图标

#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;
}

gcc example.c `pkg-config --cflags --libs gtk+-3.0`
./a.out