Qt qDebug()如何打印枚举值?
我们的应用程序中有一段简单的代码:Qt qDebug()如何打印枚举值?,qt,Qt,我们的应用程序中有一段简单的代码: void tAccessPoint::OnStateChanged(QAbstractSocket::SocketState state) { qDebug() << m_ID << " " << state; void tAccessPoint::OnStateChanged(QAbstractSocket::SocketState状态) { qDebug()这里没有moc魔术,QtNetwork在network
void tAccessPoint::OnStateChanged(QAbstractSocket::SocketState state)
{
qDebug() << m_ID << " " << state;
void tAccessPoint::OnStateChanged(QAbstractSocket::SocketState状态)
{
qDebug()这里没有moc魔术,QtNetwork在network/socket/qabstractsocket.h中明确定义了操作符:
QDebug operator<<(QDebug, QAbstractSocket::SocketState) {
switch (state) {
case QAbstractSocket::UnconnectedState:
debug << "QAbstractSocket::UnconnectedState";
break;
case QAbstractSocket::HostLookupState:
debug << "QAbstractSocket::HostLookupState";
break;
case QAbstractSocket::ConnectingState:
debug << "QAbstractSocket::ConnectingState";
break;
case QAbstractSocket::ConnectedState:
debug << "QAbstractSocket::ConnectedState";
break;
case QAbstractSocket::BoundState:
debug << "QAbstractSocket::BoundState";
break;
...
return debug;
}
可能此枚举到QString转换非常有用:
const QMetaObject & mo = QAbstractSocket::staticMetaObject;
QMetaEnum me = mo.enumerator(mo.indexOfEnumerator("SocketState"));
QString test(me.valueToKey(QAbstractSocket::UnconnectedState));
这看起来是一种非常有用的技术。不幸的是,并非所有枚举都是用MOC注册的。例如,QPrime::PrExSerSeror只是普通的C++枚举,所以不支持将它转换为名称:
const QMetaObject & mo = QAbstractSocket::staticMetaObject;
QMetaEnum me = mo.enumerator(mo.indexOfEnumerator("SocketState"));
QString test(me.valueToKey(QAbstractSocket::UnconnectedState));