Detailed Description
The QDBusPendingCall class refers to one pending asynchronous call
A QDBusPendingCall object is a reference to a method call that was sent over D-Bus without waiting for a reply. QDBusPendingCall is an opaque type, meant to be used as a handle for a pending reply.
In most programs, the QDBusPendingCall class will not be used directly. It can be safely replaced with the template-based QDBusPendingReply, in order to access the contents of the reply or wait for it to be complete.
The QDBusPendingCallWatcher class allows one to connect to a signal that will indicate when the reply has arrived or if the call has timed out. It also provides the QDBusPendingCallWatcher::waitForFinished() method which will suspend the execution of the program until the reply has arrived.
Note: If you create a copy of a QDBusPendingCall object, all information will be shared among the many copies. Therefore, QDBusPendingCall is an explicitly-shared object and does not provide a method of detaching the copies (since they refer to the same pending call)
Member Function Documentation
QDBusPendingCall::QDBusPendingCall(const QDBusPendingCall & other)
Creates a copy of the other pending asynchronous call. Note that both objects will refer to the same pending call.
QDBusPendingCall::~QDBusPendingCall()
Destroys this copy of the QDBusPendingCall object. If this copy is also the last copy of a pending asynchronous call, the call will be canceled and no further notifications will be received. There will be no way of accessing the reply's contents when it arrives.
QDBusPendingCall QDBusPendingCall::fromCompletedCall(const QDBusMessage & msg) [static]
Creates a QDBusPendingCall object based on the message msg. The message must be of type QDBusMessage::ErrorMessage or QDBusMessage::ReplyMessage (that is, a message that is typical of a completed call).
This function is useful for code that requires simulating a pending call, but that has already finished.
This function was introduced in Qt 4.6.
See also fromError().
QDBusPendingCall QDBusPendingCall::fromError(const QDBusError & error) [static]
Creates a QDBusPendingCall object based on the error condition error. The resulting pending call object will be in the "finished" state and QDBusPendingReply::isError() will return true.
This function was introduced in Qt 4.6.
See also fromCompletedCall().
void QDBusPendingCall::swap(QDBusPendingCall & other)
Swaps this pending call instance with other. This function is very fast and never fails.
This function was introduced in Qt 5.0.
QDBusPendingCall & QDBusPendingCall::operator=(const QDBusPendingCall & other)
Creates a copy of the other pending asynchronous call and drops the reference to the previously-referenced call. Note that both objects will refer to the same pending call after this function.
If this object contained the last reference of a pending asynchronous call, the call will be canceled and no further notifications will be received. There will be no way of accessing the reply's contents when it arrives.
