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#ifndef __MAN_H__<br>
#define __MAN_H__<br>
<br>
#include "boy.h"<br>
<br>
#define MAN_TYPE  (man_get_type())<br>
#define MAN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),MAN_TYPE,Man))<br>
<br>
typedef struct _Man Man;<br>
typedef struct _ManClass ManClass;<br>
<br>
struct _Man {<br>
	Boy parent;<br>
<br>
	char *job;<br>
	void (*bye)(void);<br>
};<br>
<br>
struct _ManClass {<br>
	BoyClass parent_class;<br>
};<br>
<br>
GType man_get_type(void);<br>
Man*  man_new(void);<br>
gchar* man_get_gob(Man *man);<br>
void  man_set_job(Man *man, gchar *job);<br>
Man*  man_new_with_name_age_and_job(gchar *name, gint age, gchar *job);<br>
void man_info(Man *man);<br>
<br>
#endif //__MAN_H__<br>
<br>
<br>
/* man.c */<br>
#include "man.h"<br>
<br>
static void man_bye(void);<br>
<br>
static void man_init(Man *man);<br>
static void man_class_init(Man *man);<br>
<br>
GType man_get_type(void)<br>
{<br>
	static GType man_type = 0;<br>
	if(!man_type)<br>
	{<br>
		static const GTypeInfo man_info = {<br>
			sizeof(ManClass),<br>
			NULL, NULL,<br>
			(GClassInitFunc)man_class_init,<br>
			NULL, NULL,<br>
			sizeof(Man),<br>
			0,<br>
			(GInstanceInitFunc)man_init<br>
		};<br>
		man_type = g_type_register_static(BOY_TYPE, "Man", &man_info, 0);<br>
	}<br>
	return man_type;<br>
<br>
}<br>
<br>
static void man_init(Man *man)<br>
{<br>
	man-&gt;job = "none";<br>
	man-&gt;bye = man_bye;<br>
}<br>
<br>
static void man_class_init(Man *man)<br>
{<br>
}<br>
<br>
Man*  man_new(void)<br>
{<br>
	Man *man;<br>
	man = g_object_new(MAN_TYPE, 0);<br>
	return man;<br>
}<br>
<br>
gchar* man_get_gob(Man *man)<br>
{<br>
	return man-&gt;job;<br>
}<br>
<br>
void  man_set_job(Man *man, gchar *job)<br>
{<br>
	man-&gt;job = job;<br>
}<br>
<br>
Man*  man_new_with_name_age_and_job(gchar *name, gint age, gchar *job)<br>
{<br>
	Man *man;<br>
	man = man_new();<br>
	boy_set_name(BOY(man), name);<br>
	boy_set_age(BOY(man), age);<br>
	man_set_job(man, job);<br>
	return man;<br>
}<br>
<br>
static void man_bye(void)<br>
{<br>
	g_print("Goodbye everyone !");<br>
}<br>
<br>
void man_info(Man *man)<br>
{<br>
	g_print("the man name is %s", BOY(man)-&gt;name);<br>
	g_print("the man age is %d", BOY(man)-&gt;age);<br>
	g_print("the man job is %s", man-&gt;job);<br>
}<br>
<br>
关键在于定义对象时将父对象实例定义为Boy，父类设定为BoyClass，在注册此对象时将其父对象类型设为BOY_TYPE，在设定对象属性时如用到父对象的属性要强制转换下，如取得对象的name属性，就必须用BOY(obj)-&gt;name，因为Man本身没有name属性，而其父对象Boy 有，所以用BOY宏将其强制为Boy类型的对象。<br>
<br>
测试我们定义的对象<br>
<br>
<br>
#include &lt;glib.h&gt;<br>
<br>
#include "boy.h"<br>
#include "man.h"<br>
<br>
int main(int argc, char *argv[])<br>
{<br>
	Boy *tom, *peter;<br>
	Man *green, *brown;	<br>
<br>
	g_type_init();//注意，初始化类型系统，必需<br>
<br>
	tom = boy_new_with_name("Tom");<br>
	tom-&gt;cry();<br>
	boy_info(tom);<br>
<br>
	peter = boy_new_with_name_and_age("Peter", 10);<br>
	peter-&gt;cry();<br>
	boy_info(peter);<br>
<br>
	green = man_new();<br>
	boy_set_name(BOY(green), "Green");<br>
//设定Man对象的name属性用到其父对象Boy的方法<br>
	boy_set_age(BOY(green), 28);<br>
	man_set_job(green, "Doctor");<br>
	green-&gt;bye();<br>
	man_info(green);<br>
<br>
	brown = man_new_with_name_age_and_job("Brown", 30, "Teacher");<br>
	brown-&gt;bye();<br>
	man_info(brown);<br>
<br>
}<br>
<br>
Makefile文件如下：<br>
<br>
CC = gcc<br>
all:<br>
	$(CC) -c boy.c `pkg-config --cflags glib-2.0 gobject-2.0`<br>
	$(CC) -c man.c `pkg-config --cflags glib-2.0 gobject-2.0`<br>
	$(CC) -c main.c `pkg-config --cflags glib-2.0 gobject-2.0`<br>
	$(CC) -o simple boy.o man.o main.o `pkg-config --libs glib-2.0 gobject-2.0`<br>
<br>
执行make命令编译，编译结束后，执行./simple运行此测试程序，输出结果如下：<br>
<br>
Message : A boy was born .<br>
The Boy is crying ......<br>
The Boy name is Tom<br>
The Boy age is 0<br>
Message : A boy was born .<br>
The Boy is crying ......<br>
The Boy name is Peter<br>
The Boy age is 10<br>
Goodbye everyone !<br>
the man name is Green<br>
the man age is 28<br>
the man job is Doctor<br>
Goodbye everyone !<br>
the man name is Brown<br>
the man age is 30<br>
the man job is Teacher<br>
<br>
Makefile中用到`pkg-config -cflags -libs gobject-2.0`，在GLIB中将线程（gthread），插件（gmoudle）和对象系统（gobject）这三个子系统区别对待，编译时要注意加入相应的参数。<br>
<br>
本文只是概要的介绍了如何定义和实现GObject对象，GObject系统中还有很多相关内容，如：枚举和标识类型（Enumeration and flags types）；Gboxed，是Gtype系统中注册一种封装为不透明的C语言结构类型的机制；许多对象用到的参数对象都是C结构类型，使用者不必了解其结构的内部定义，即不透明，GBoxed即是实现这一功能的机制；标准的参数和变量类型的定义（Standard Parameter and Value Types）等，它们都以C语言来开发，是深入了解和掌握GObject的关键。<br>
<br>
透过以上代码实现，我们还可以看出，以GLIB为基础的GTK+/GNOME开发环境所具有的独特的编程风格和独到的开发思想。这一点在长期的编程实践中会体验得更深刻。<br>
<br>
有了GObject系统这一基础，GTK+通过它将X窗口环境中的控件（Widget）巧妙的封装起来，这使开发LINUX平台上的GUI应用程序更方便，更快捷。<br>
<br>
　<br>
<br>
以上代码在Redhat 8.0 Linux平台，GLIB2.2.1环境下编译通过。<br>
<br>
感谢<br>
本文的写作参考了中国LINUX论坛的网友hoyt的文章，可以在gtkvb.cffd.org.cn找到，在此表示感谢。<br>
<br>
参考资料<br>
<br>
    * 本文的所有代码可以在这里下载。<br>
    * Thomas Hunger写的文章：Gobject tutorial<br>
    * 中国 linux 论坛的网友 hoyt 的网页 http://gtkvb.cosoft.org.cn/ 上的文章<br>
    * 与本文相关的另一篇文章《浅析GLib》<br>
<br>
　<br>
关于作者<br>
宋国伟，乡村小学英语教师，他是《GTK+2.0编程范例》（清华大学出版社出版）一书的作者，业余时间致力于用GTK+开发LINUX GUI应用程序，可以通过电子邮件地址 gwsong52@sohu.com 与他联系。<br>
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