GObject 常用宏
G_TYPE_IS_OBJECT(type)
- 说明：检查传入的类型
type是否为G_TYPE_OBJECT或其派生
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#define G_TYPE_IS_OBJECT(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_OBJECT)
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G_OBJECT(obj)
- 说明：将GObject或派生GObject的子类转为GObject
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#define G_OBJECT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_OBJECT, GObject))
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G_OBJECT_CLASS(klass)
- 说明：将GObjectClass或派生GObject的子类转为GObjectClass
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#define G_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_OBJECT, GObjectClass))
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G_IS_OBJECT(object)
- 说明：检查是否是
G_TYPE_OBJECT 类型
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#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
#define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((object), G_TYPE_OBJECT))
#else
#define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_OBJECT))
#endif
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G_IS_OBJECT_CLASS(klass)
- 说明：检查
klass是否是可用的GObjectClass结构
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#define G_IS_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_OBJECT))
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G_OBJECT_GET_CLASS(obj)
- 说明：通过 GObject 实例得到 GObjectClass 实例
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#define G_OBJECT_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_OBJECT, GObjectClass))
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G_OBJECT_TYPE(obj)
- 说明：返回GObject对象的ID（
G_TYPE_OBJECT对应的那个数字）
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#define G_OBJECT_TYPE(object) (G_TYPE_FROM_INSTANCE (object))
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G_OBJECT_TYPE_NAME(obj)
- 说明：返回GObject对象的字符串(此字符串是对象注册时候用到的那个)
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#define G_OBJECT_TYPE_NAME(object) (g_type_name (G_OBJECT_TYPE (object)))
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G_OBJECT_CLASS_TYPE(klass)
- 说明：根据GObjectClass 获取到 Type ID
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#define G_OBJECT_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
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G_OBJECT_CLASS_NAME(class)
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#define G_OBJECT_CLASS_NAME(class) (g_type_name (G_OBJECT_CLASS_TYPE (class)))
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G_VALUE_HOLDS_OBJECT(value)
- 说明：检查给定 value 是否可以保存来自
G_TYPE_OBJECT 的值
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#define G_VALUE_HOLDS_OBJECT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_OBJECT))
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G_TYPE_INITIALLY_UNOWNED
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#define G_TYPE_INITIALLY_UNOWNED (g_initially_unowned_get_type())
#define G_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnowned))
#define G_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
#define G_IS_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_INITIALLY_UNOWNED))
#define G_IS_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_INITIALLY_UNOWNED))
#define G_INITIALLY_UNOWNED_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
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我发现 IBusObject 中用到，暂时不明白功能，推测这个地方使用“原型设计模式”来创建其它类型
GObject结构层次
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GObject
├── GBinding
├── GBindingGroup
├── GInitiallyUnowned
├── GSignalGroup
╰── GTypeModule
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typedef struct _GObject GObject;
typedef struct _GObjectClass GObjectClass;
typedef struct _GObject GInitiallyUnowned;
typedef struct _GObjectClass GInitiallyUnownedClass;
typedef struct _GObjectConstructParam GObjectConstructParam;
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