Detailed Description
The QNetworkOperation class provides common operations for network protocols.
An object is created to describe the operation and the current
state for each operation that a network protocol should process.
For a detailed description of the Qt Network Architecture and how
to implement and use network protocols in Qt, see the Qt Network Documentation.
See also QNetworkProtocol and Input/Output and Networking.
Member Function Documentation
Constructs a network operation object. operation is the type of
the operation, and arg0, arg1 and arg2 are the first
three arguments of the operation. The state is initialized to
QNetworkProtocol::StWaiting.
See also QNetworkProtocol::Operation and QNetworkProtocol::State.
Constructs a network operation object. operation is the type of
the operation, and arg0, arg1 and arg2 are the first
three raw data arguments of the operation. The state is
initialized to QNetworkProtocol::StWaiting.
See also QNetworkProtocol::Operation and QNetworkProtocol::State.
QNetworkOperation::~QNetworkOperation ()
Destructor.
QString QNetworkOperation::arg ( int num ) const
Returns the operation's num-th argument. If this argument was
not already set, an empty string is returned.
Example: network/networkprotocol/nntp.cpp.
int QNetworkOperation::errorCode () const
Returns the error code for the last error that occurred.
void QNetworkOperation::free ()
Sets this object to delete itself when it hasn't been used for one
second.
Because QNetworkOperation pointers are passed around a lot the
QNetworkProtocol generally does not have enough knowledge to
delete these at the correct time. If a QNetworkProtocol doesn't
need an operation any more it will call this function instead.
Note: you should never need to call the method yourself.
Returns the type of the operation.
QString QNetworkOperation::protocolDetail () const
Returns a detailed error message for the last error. This must
have been set using setProtocolDetail().
QByteArray QNetworkOperation::rawArg ( int num ) const
Returns the operation's num-th raw data argument. If this
argument was not already set, an empty bytearray is returned.
void QNetworkOperation::setArg ( int num, const QString & arg )
Sets the network operation's num-th argument to arg.
void QNetworkOperation::setErrorCode ( int ec )
Sets the error code to ec.
If the operation failed, the protocol should set an error code to
describe the error in more detail. If possible, one of the error
codes defined in QNetworkProtocol should be used.
See also setProtocolDetail() and QNetworkProtocol::Error.
void QNetworkOperation::setProtocolDetail ( const QString & detail )
If the operation failed, the error message can be specified as detail.
void QNetworkOperation::setRawArg ( int num, const QByteArray & arg )
Sets the network operation's num-th raw data argument to arg.
Sets the state of the operation object. This should be done by
the network protocol during processing; at the end it should be
set to QNetworkProtocol::StDone or QNetworkProtocol::StFailed,
depending on success or failure.
See also QNetworkProtocol::State.
Returns the state of the operation. You can determine whether an
operation is still waiting to be processed, is being processed,
has been processed successfully, or failed.
This file is part of the Qt toolkit.
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