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# QDBusAbstractInterface Class Reference
[QtDBus module]

The QDBusAbstractInterface class is the base class for all D-Bus interfaces in the QtDBus binding, allowing access to remote interfaces More...

Inherits QObject.

Inherited by QDBusConnectionInterface and QDBusInterface.

### Methods

- __init__ (self, QString service, QString path, str interface, QDBusConnection connection, QObject parent)
- QDBusPendingCall asyncCall (self, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())
- QDBusPendingCall asyncCallWithArgumentList (self, QString method, list-of-QVariant args)
- QDBusMessage call (self, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())
- QDBusMessage call (self, QDBus.CallMode mode, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())
- QDBusMessage callWithArgumentList (self, QDBus.CallMode mode, QString method, list-of-QVariant args)
- bool callWithCallback (self, QString method, list-of-QVariant args, QObject receiver, SLOT() returnMethod, SLOT() errorMethod)
- object callWithCallback (self, QString method, list-of-QVariant args, callable returnMethod, callable errorMethod)
- bool callWithCallback (self, QString method, list-of-QVariant args, QObject receiver, SLOT() slot)
- object callWithCallback (self, QString method, list-of-QVariant args, callable slot)
- QDBusConnection connection (self)
- connectNotify (self, SIGNAL() signal)
- disconnectNotify (self, SIGNAL() signal)
- QString interface (self)
- bool isValid (self)
- QDBusError lastError (self)
- QString path (self)
- QString service (self)

## Detailed Description

The QDBusAbstractInterface class is the base class for all D-Bus interfaces in the QtDBus binding, allowing access to remote interfaces

Generated-code classes also derive from QDBusAbstractInterface, all methods described here are also valid for generated-code classes. In addition to those described here, generated-code classes provide member functions for the remote methods, which allow for compile-time checking of the correct parameters and return values, as well as property type-matching and signal parameter-matching.

## Method Documentation

### QDBusAbstractInterface.__init__ (self, QString service, QString path, str interface, QDBusConnection connection, QObject parent)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

### QDBusPendingCall QDBusAbstractInterface.asyncCall (self, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())

Calls the method method on this interface and passes the parameters to this function to the method.

The parameters to `call` are passed on to the remote function via D-Bus as input arguments. The returned QDBusPendingCall object can be used to find out information about the reply.

This function can be used with up to 8 parameters, passed in arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 and arg8. If you need more than 8 parameters or if you have a variable number of parameters to be passed, use asyncCallWithArgumentList().

It can be used the following way:

     QString value = retrieveValue();
     QDBusPendingCall pcall = interface->asyncCall(QLatin1String("Process"), value);

     QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pcall, this);

     QObject.connect(watcher, SIGNAL(finished(QDBusPendingCallWatcher*)),
                      this, SLOT(callFinishedSlot(QDBusPendingCallWatcher*)));

This example illustrates function calling with 0, 1 and 2 parameters and illustrates different parameter types passed in each (the first call to `"ProcessWorkUnicode"` will contain one Unicode string, the second call to `"ProcessWork"` will contain one string and one byte array).

This function was introduced in Qt 4.5.

### QDBusPendingCall QDBusAbstractInterface.asyncCallWithArgumentList (self, QString method, list-of-QVariant args)

Places a call to the remote method specified by method on this interface, using args as arguments. This function returns a QDBusPendingCall object that can be used to track the status of the reply and access its contents once it has arrived.

Normally, you should place calls using asyncCall().

Note: This function is thread-safe.

This function was introduced in Qt 4.5.

### QDBusMessage QDBusAbstractInterface.call (self, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())

Calls the method method on this interface and passes the parameters to this function to the method.

The parameters to `call` are passed on to the remote function via D-Bus as input arguments. Output arguments are returned in the QDBusMessage reply. If the reply is an error reply, lastError() will also be set to the contents of the error message.

This function can be used with up to 8 parameters, passed in arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 and arg8. If you need more than 8 parameters or if you have a variable number of parameters to be passed, use callWithArgumentList().

It can be used the following way:

     QString value = retrieveValue();
     QDBusMessage reply;

     QDBusReply<int> api = interface->call(QLatin1String("GetAPIVersion"));
     if (api >= 14)
       reply = interface->call(QLatin1String("ProcessWorkUnicode"), value);
     else
       reply = interface->call(QLatin1String("ProcessWork"), QLatin1String("UTF-8"), value.toUtf8());

This example illustrates function calling with 0, 1 and 2 parameters and illustrates different parameter types passed in each (the first call to `"ProcessWorkUnicode"` will contain one Unicode string, the second call to `"ProcessWork"` will contain one string and one byte array).

### QDBusMessage QDBusAbstractInterface.call (self, QDBus.CallMode mode, QString method, QVariant arg1 = QVariant(), QVariant arg2 = QVariant(), QVariant arg3 = QVariant(), QVariant arg4 = QVariant(), QVariant arg5 = QVariant(), QVariant arg6 = QVariant(), QVariant arg7 = QVariant(), QVariant arg8 = QVariant())

This is an overloaded function.

Calls the method method on this interface and passes the parameters to this function to the method. If mode is `NoWaitForReply`, then this function will return immediately after placing the call, without waiting for a reply from the remote method. Otherwise, mode indicates whether this function should activate the Qt Event Loop while waiting for the reply to arrive.

This function can be used with up to 8 parameters, passed in arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 and arg8. If you need more than 8 parameters or if you have a variable number of parameters to be passed, use callWithArgumentList().

If this function reenters the Qt event loop in order to wait for the reply, it will exclude user input. During the wait, it may deliver signals and other method calls to your application. Therefore, it must be prepared to handle a reentrancy whenever a call is placed with call().

### QDBusMessage QDBusAbstractInterface.callWithArgumentList (self, QDBus.CallMode mode, QString method, list-of-QVariant args)

Places a call to the remote method specified by method on this interface, using args as arguments. This function returns the message that was received as a reply, which can be a normal QDBusMessage.ReplyMessage (indicating success) or QDBusMessage.ErrorMessage (if the call failed). The mode parameter specifies how this call should be placed.

If the call succeeds, lastError() will be cleared; otherwise, it will contain the error this call produced.

Normally, you should place calls using call().

Warning: If you use `UseEventLoop`, your code must be prepared to deal with any reentrancy: other method calls and signals may be delivered before this function returns, as well as other Qt queued signals and events.

Note: This function is thread-safe.

### bool QDBusAbstractInterface.callWithCallback (self, QString method, list-of-QVariant args, QObject receiver, SLOT() returnMethod, SLOT() errorMethod)

Places a call to the remote method specified by method on this interface, using args as arguments. This function returns immediately after queueing the call. The reply from the remote function is delivered to the returnMethod on object receiver. If an error occurs, the errorMethod on object receiver is called instead.

This function returns true if the queueing succeeds. It does not indicate that the executed call succeeded. If it fails, the errorMethod is called. If the queueing failed, this function returns false and no slot will be called.

The returnMethod must have as its parameters the types returned by the function call. Optionally, it may have a QDBusMessage parameter as its last or only parameter. The errorMethod must have a QDBusError as its only parameter.

This function was introduced in Qt 4.3.

See also QDBusError and QDBusMessage.

### object QDBusAbstractInterface.callWithCallback (self, QString method, list-of-QVariant args, callable returnMethod, callable errorMethod)

This is an overloaded function.

This function is deprecated. Please use the overloaded version.

Places a call to the remote method specified by method on this interface, using args as arguments. This function returns immediately after queueing the call. The reply from the remote function or any errors emitted by it are delivered to the slot slot on object receiver.

This function returns true if the queueing succeeded: it does not indicate that the call succeeded. If it failed, the slot will be called with an error message. lastError() will not be set under those circumstances.

See also QDBusError and QDBusMessage.

### bool QDBusAbstractInterface.callWithCallback (self, QString method, list-of-QVariant args, QObject receiver, SLOT() slot)

### object QDBusAbstractInterface.callWithCallback (self, QString method, list-of-QVariant args, callable slot)

### QDBusConnection QDBusAbstractInterface.connection (self)

Returns the connection this interface is assocated with.

### QDBusAbstractInterface.connectNotify (self, SIGNAL() signal)

### QDBusAbstractInterface.disconnectNotify (self, SIGNAL() signal)

### QString QDBusAbstractInterface.interface (self)

Returns the name of this interface.

### bool QDBusAbstractInterface.isValid (self)

Returns true if this is a valid reference to a remote object. It returns false if there was an error during the creation of this interface (for instance, if the remote application does not exist).

Note: when dealing with remote objects, it is not always possible to determine if it exists when creating a QDBusInterface.

### QDBusError QDBusAbstractInterface.lastError (self)

Returns the error the last operation produced, or an invalid error if the last operation did not produce an error.

### QString QDBusAbstractInterface.path (self)

### QString QDBusAbstractInterface.service (self)

Returns the name of the service this interface is associated with.