QObject在QT中是所有类的基类，经过MOC处理后代码如下
之所以贴出这段代码，是因为很多流程追踪到最后一些关键性函数都是出自这个类
源码 4.8.6 MOC版本 63
1 /****************************************************************************
2 ** Meta object code from reading C++ file 'qobject.h'
3 **
4 ** Created by: The Qt Meta Object Compiler version 63 (Qt 4.8.6)
5 **
6 ** WARNING! All changes made in this file will be lost!
7 *****************************************************************************/
8
9 #include "qobject.h"
10 #if !defined(Q_MOC_OUTPUT_REVISION)
11 #error "The header file 'qobject.h' doesn't include <QObject>."
12 #elif Q_MOC_OUTPUT_REVISION != 63
13 #error "This file was generated using the moc from 4.8.6. It"
14 #error "cannot be used with the include files from this version of Qt."
15 #error "(The moc has changed too much.)"
16 #endif
17
18 QT_BEGIN_MOC_NAMESPACE
19 static const uint qt_meta_data_QObject[] = {
20
21 // content:
22 6, // revision
23 0, // classname
24 0, 0, // classinfo
25 4, 14, // methods
26 1, 34, // properties
27 0, 0, // enums/sets
28 2, 37, // constructors
29 0, // flags
30 2, // signalCount
31
32 // signals: signature, parameters, type, tag, flags
33 9, 8, 8, 8, 0x05,
34 29, 8, 8, 8, 0x25,
35
36 // slots: signature, parameters, type, tag, flags
37 41, 8, 8, 8, 0x0a,
38 55, 8, 8, 8, 0x08,
39
40 // properties: name, type, flags
41 90, 82, 0x0a095103,
42
43 // constructors: signature, parameters, type, tag, flags
44 108, 101, 8, 8, 0x0e,
45 126, 8, 8, 8, 0x2e,
46
47 0 // eod
48 };
49
50 static const char qt_meta_stringdata_QObject[] = {
51 "QObject\0\0destroyed(QObject*)\0destroyed()\0"
52 "deleteLater()\0_q_reregisterTimers(void*)\0"
53 "QString\0objectName\0parent\0QObject(QObject*)\0"
54 "QObject()\0"
55 };
56
57 void QObject::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
58 {
59 if (_c == QMetaObject::CreateInstance) {
60 switch (_id) {
61 case 0: { QObject *_r = new QObject((*reinterpret_cast< QObject*(*)>(_a[1])));
62 if (_a[0]) *reinterpret_cast<QObject**>(_a[0]) = _r; } break;
63 case 1: { QObject *_r = new QObject();
64 if (_a[0]) *reinterpret_cast<QObject**>(_a[0]) = _r; } break;
65 }
66 } else if (_c == QMetaObject::InvokeMetaMethod) {
67 Q_ASSERT(staticMetaObject.cast(_o));
68 QObject *_t = static_cast<QObject *>(_o);
69 switch (_id) {
70 case 0: _t->destroyed((*reinterpret_cast< QObject*(*)>(_a[1]))); break;
71 case 1: _t->destroyed(); break;
72 case 2: _t->deleteLater(); break;
73 case 3: _t->d_func()->_q_reregisterTimers((*reinterpret_cast< void*(*)>(_a[1]))); break;
74 default: ;
75 }
76 }
77 }
78
79 const QMetaObjectExtraData QObject::staticMetaObjectExtraData = {
80 0, qt_static_metacall
81 };
82
83 const QMetaObject QObject::staticMetaObject = {
84 { 0, qt_meta_stringdata_QObject,
85 qt_meta_data_QObject, &staticMetaObjectExtraData }
86 };
87
88 #ifdef Q_NO_DATA_RELOCATION
89 const QMetaObject &QObject::getStaticMetaObject() { return staticMetaObject; }
90 #endif //Q_NO_DATA_RELOCATION
91
92 const QMetaObject *QObject::metaObject() const
93 {
94 return QObject::d_ptr->metaObject ? QObject::d_ptr->metaObject : &staticMetaObject;
95 }
96
97 void *QObject::qt_metacast(const char *_clname)
98 {
99 if (!_clname) return 0;
100 if (!strcmp(_clname, qt_meta_stringdata_QObject))
101 return static_cast<void*>(const_cast< QObject*>(this));
102 return 0;
103 }
104
105 int QObject::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
106 {
107 if (_id < 0)
108 return _id;
109 if (_c == QMetaObject::InvokeMetaMethod) {
110 if (_id < 4)
111 qt_static_metacall(this, _c, _id, _a);
112 _id -= 4;
113 }
114 #ifndef QT_NO_PROPERTIES
115 else if (_c == QMetaObject::ReadProperty) {
116 void *_v = _a[0];
117 switch (_id) {
118 case 0: *reinterpret_cast< QString*>(_v) = objectName(); break;
119 }
120 _id -= 1;
121 } else if (_c == QMetaObject::WriteProperty) {
122 void *_v = _a[0];
123 switch (_id) {
124 case 0: setObjectName(*reinterpret_cast< QString*>(_v)); break;
125 }
126 _id -= 1;
127 } else if (_c == QMetaObject::ResetProperty) {
128 _id -= 1;
129 } else if (_c == QMetaObject::QueryPropertyDesignable) {
130 _id -= 1;
131 } else if (_c == QMetaObject::QueryPropertyScriptable) {
132 _id -= 1;
133 } else if (_c == QMetaObject::QueryPropertyStored) {
134 _id -= 1;
135 } else if (_c == QMetaObject::QueryPropertyEditable) {
136 _id -= 1;
137 } else if (_c == QMetaObject::QueryPropertyUser) {
138 _id -= 1;
139 }
140 #endif // QT_NO_PROPERTIES
141 return _id;
142 }
143
144 // SIGNAL 0
145 void QObject::destroyed(QObject * _t1)
146 {
147 void *_a[] = { 0, const_cast<void*>(reinterpret_cast<const void*>(&_t1)) };
148 QMetaObject::activate(this, &staticMetaObject, 0, _a);
149 }
150 QT_END_MOC_NAMESPACE
仅供参考，做一些深层次的分析
转自：http://www.cnblogs.com/lfsblack/p/5319437.html