# kdecore Library API Documentation

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# KNetwork::KStreamSocket Class Reference

Simple stream socket. More...

`#include <kstreamsocket.h>`

Inheritance diagram for KNetwork::KStreamSocket:

[legend]
Collaboration diagram for KNetwork::KStreamSocket:

[legend]
List of all members.

## Signals

void | timedOut ()

## Public Member Functions

| KStreamSocket (const QString &node=QString::null, const QString &service=QString::null, QObject *parent=0L, const char *name=0L)
virtual | ~KStreamSocket ()
int | timeout () const
int | remainingTimeout () const
void | setTimeout (int msecs)
virtual bool | bind (const QString &node=QString::null, const QString &service=QString::null)
virtual bool | bind (const KResolverEntry &entry)
virtual bool | connect (const QString &node=QString::null, const QString &service=QString::null)
virtual bool | connect (const KResolverEntry &entry)

## Friends

class | KServerSocket

## Detailed Description

Simple stream socket.

This class provides functionality to creating unbuffered, stream sockets. In the case of Internet (IP) sockets, this class creates and uses TCP/IP sockets.

Objects of this class start, by default, on non-blocking mode. Call setBlocking if you wish to change that.

Sample usage:

       QByteArray httpGet(const QString& hostname)
       {
         KStreamSocket socket(hostname, "http");
         if (!socket.connect())
           return QByteArray();
         QByteArray data = socket.readAll();
         return data;
       }

Here's another sample, showing asynchronous operation:

      DataRetriever::DataRetriever(const QString& hostname, const QString& port)
        : socket(hostname, port)
      {
        // connect signals to our slots
        QObject::connect(&socket, SIGNAL(connected(const KResolverEntry&)),
                         this, SLOT(slotSocketConnected()));
        QObject::connect(&socket, SIGNAL(gotError(int)),
                         this, SLOT(slotSocketError(int)));
        QObject::connect(&socket, SIGNAL(readyRead()),
                         this, SLOT(slotSocketReadyToRead()));
        QObject::connect(&socket, SIGNAL(readyWrite()),
                         this, SLOT(slotSocketReadyToWrite()));

        // set non-blocking mode in order to work asynchronously
        socket.setBlocking(false);

        // turn on signal emission
        socket.enableRead(true);
        socket.enableWrite(true);

        // start connecting
        socket.connect();
      }

Author:
  Thiago Macieira <thiago.macieira@kdemail.net>

Version:
  0.9

Definition at line 91 of file kstreamsocket.h.

## Constructor & Destructor Documentation

KStreamSocket::KStreamSocket | ( | const QString & | node = `QString::null`,
|  | const QString & | service = `QString::null`,
|  | QObject * | parent = `0L`,
|  | const char * | name = `0L`
| ) |

Default constructor.

Parameters:

  | node | destination host
  | service | destination service to connect to
  | parent | the parent QObject object
  | name | the name of this object

Definition at line 52 of file kstreamsocket.cpp.

References QObject::connect(), KNetwork::KClientSocketBase::localResolver(), KNetwork::KClientSocketBase::peerResolver(), KNetwork::KResolver::setFamily(), KNetwork::KResolver::setNodeName(), KNetwork::KResolver::setServiceName(), KNetwork::KClientSocketBase::setSocketOptions(), KNetwork::KSocketBase::socketOptions(), and timeout().

KStreamSocket::~KStreamSocket | ( |  | ) | `[virtual]`

| Destructor. This closes the socket. Definition at line 66 of file kstreamsocket.cpp.

## Member Function Documentation

int KStreamSocket::timeout | ( |  | ) | const

| Retrieves the timeout value (in milliseconds). Definition at line 72 of file kstreamsocket.cpp. Referenced by connect(), KStreamSocket(), and remainingTimeout().

int KStreamSocket::remainingTimeout | ( |  | ) | const

| Retrieves the remaining timeout time (in milliseconds). This value equals timeout() if there's no connection in progress. Definition at line 77 of file kstreamsocket.cpp. References KNetwork::KClientSocketBase::state(), and timeout(). Referenced by connect().

void KStreamSocket::setTimeout | ( | int | msecs | ) |

Sets the timeout value.

Setting this value while a connection attempt is in progress will reset the timer.

Please note that the timeout value is valid for the connection attempt only. No other operations are timed against this value -- including the name lookup associated.

Parameters:

  | msecs | the timeout value in milliseconds

Definition at line 87 of file kstreamsocket.cpp.

References KNetwork::KClientSocketBase::state().

bool KStreamSocket::bind | ( | const QString & | node = `QString::null`,
|  | const QString & | service = `QString::null`
| ) | `[virtual]`

Binds this socket to the given nodename and service, or use the default ones if none are given.

In order to bind to a service and allow the operating system to choose the interface, set `node` to QString::null.

Reimplemented from KClientSocketBase.

Upon successful binding, the bound signal will be emitted. If an error is found, the gotError signal will be emitted.

Note:
  Due to the internals of the name lookup and binding mechanism, some (if not most) implementations of this function do not actually bind the socket until the connection is requested (see connect). They only set the values for future reference.

This function returns true on success.

Parameters:

  | node | the nodename
  | service | the service

Implements KNetwork::KClientSocketBase.

Definition at line 95 of file kstreamsocket.cpp.

References KNetwork::KClientSocketBase::localResolver(), KNetwork::KResolver::setNodeName(), KNetwork::KResolver::setServiceName(), and KNetwork::KClientSocketBase::state().

virtual bool KNetwork::KStreamSocket::bind | ( | const KResolverEntry & | entry | ) | `[inline, virtual]`

| Reimplemented from KClientSocketBase. Connect this socket to this specific address. Unlike bind(const QString&, const QString&) above, this function really does bind the socket. No lookup is performed. The bound signal will be emitted. Reimplemented from KNetwork::KClientSocketBase. Definition at line 169 of file kstreamsocket.h.

bool KStreamSocket::connect | ( | const QString & | node = `QString::null`,
|  | const QString & | service = `QString::null`
| ) | `[virtual]`

Reimplemented from KClientSocketBase.

Attempts to connect to the these hostname and service, or use the default ones if none are given. If a connection attempt is already in progress, check on its state and set the error status (NoError, meaning the connection is completed, or InProgress).

If the blocking mode for this object is on, this function will only return when all the resolved peer addresses have been tried or when a connection is established.

Upon successfully connecting, the connected signal will be emitted. If an error is found, the gotError signal will be emitted.

This function also implements timeout handling.

Parameters:

  | node | the remote node to connect to
  | service | the service on the remote node to connect to

Implements KNetwork::KClientSocketBase.

Definition at line 107 of file kstreamsocket.cpp.

References KNetwork::KSocketBase::blocking(), QObject::connect(), KNetwork::KSocketBase::error(), KNetwork::KClientSocketBase::gotError(), KNetwork::KClientSocketBase::hostFound(), KNetwork::KClientSocketBase::lookup(), KNetwork::KClientSocketBase::peerResolver(), KNetwork::KSocketDevice::poll(), remainingTimeout(), KNetwork::KSocketBase::setBlocking(), KNetwork::KActiveSocketBase::setError(), KNetwork::KResolver::setNodeName(), KNetwork::KResolver::setServiceName(), KNetwork::KSocketBase::socketDevice(), KNetwork::KResolver::start(), KNetwork::KClientSocketBase::state(), and timeout().

bool KStreamSocket::connect | ( | const KResolverEntry & | entry | ) | `[virtual]`

| Unshadowing from KClientSocketBase. Reimplemented from KNetwork::KClientSocketBase. Definition at line 191 of file kstreamsocket.cpp.

void KNetwork::KStreamSocket::timedOut | ( |  | ) | `[signal]`

| This signal is emitted when a connection timeout occurs.

The documentation for this class was generated from the following files:

- kstreamsocket.h
- kstreamsocket.cpp

This file is part of the documentation for kdecore Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:19:29 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003