Qt函数connectSlotsByName()，即"QMetaObject::connectSlotsByName(QObject *o)"的说明

 connectSlotsByName()函数源码如下：

void QMetaObject::connectSlotsByName(QObject *o){    if (!o)        return;    const QMetaObject *mo = o->metaObject();    Q_ASSERT(mo);    const QObjectList list = qFindChildren<QObject *>(o, QString());    for (int i = 0; i < mo->methodCount(); ++i) {        const char *slot = mo->method(i).signature();         Q_ASSERT(slot);         if (slot[0] != 'o' || slot[1] != 'n' || slot[2] != '_')             continue;         bool foundIt = false;         for(int j = 0; j < list.count(); ++j) {             const QObject *co = list.at(j);             QByteArray objName = co->objectName().toAscii();             int len = objName.length();             if (!len || qstrncmp(slot + 3, objName.data(), len) || slot[len+3] != '_')                 continue;             const QMetaObject *smo = co->metaObject();             int sigIndex = smo->indexOfMethod(slot + len + 4);             if (sigIndex < 0) { // search for compatible signals                 int slotlen = qstrlen(slot + len + 4) - 1;                 for (int k = 0; k < co->metaObject()->methodCount(); ++k) {                     if (smo->method(k).methodType() != QMetaMethod::Signal)                         continue;                      if (!qstrncmp(smo->method(k).signature(), slot + len + 4, slotlen)) {                         sigIndex = k;                         break;                     }                 }             }             if (sigIndex < 0)                 continue;             if (QMetaObject::connect(co, sigIndex, o, i)) {                 foundIt = true;                 break;             }         }         if (foundIt) {             // we found our slot, now skip all overloads             while (mo->method(i + 1).attributes() & QMetaMethod::Cloned)                   ++i;         } else if (!(mo->method(i).attributes() & QMetaMethod::Cloned)) {             qWarning("QMetaObject::connectSlotsByName: No matching signal for %s", slot);         }     }} 

按下F1，出现如下说明：

void QMetaObject::connectSlotsByName ( QObject * object ) [static]Searches recursively for all child objects of the given object, and connects matching signals from them to slots of object that follow the following form:    void on_<object name>_<signal name>(<signal parameters>);Let's assume our object has a child object of type QPushButton with the object name button1. The slot to catch the button's clicked() signal would be:        void on_button1_clicked();See also QObject::setObjectName().

connectSlotsByName()函数说明：
connectSlotsByName 是一个QMetaObject类里的static函数，其作用是用来将QObject *o里的子QObject的某些信号按照其objectName连接到o的槽上。

注意：

1. 如果QObject *o中有多个同名的子object，connectSlotsByName只能给其中一个建立缺省的信号和槽的连接。

2. connectSlotsByName更适合的任务是与Qt desinger配合完成缺省的信号和槽的连接。