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Tipos públicos | Métodos públicos | Métodos protegidos
Referencia de la Clase QSocketDevice

The QSocketDevice class provides a platform-independent low-level socket API.network. Más...

#include <qsocketdevice.h>

Diagrama de herencias de QSocketDevice
QIODevice QIODevice

Lista de todos los miembros.

Tipos públicos

enum  Type { Stream, Datagram, Stream, Datagram }
enum  Protocol {
  IPv4, IPv6, Unknown, IPv4,
  IPv6, Unknown
}
enum  Error {
  NoError, AlreadyBound, Inaccessible, NoResources,
  InternalError, Bug = InternalError, Impossible, NoFiles,
  ConnectionRefused, NetworkFailure, UnknownError, NoError,
  AlreadyBound, Inaccessible, NoResources, InternalError,
  Bug = InternalError, Impossible, NoFiles, ConnectionRefused,
  NetworkFailure, UnknownError
}
enum  Type { Stream, Datagram, Stream, Datagram }
enum  Protocol {
  IPv4, IPv6, Unknown, IPv4,
  IPv6, Unknown
}
enum  Error {
  NoError, AlreadyBound, Inaccessible, NoResources,
  InternalError, Bug = InternalError, Impossible, NoFiles,
  ConnectionRefused, NetworkFailure, UnknownError, NoError,
  AlreadyBound, Inaccessible, NoResources, InternalError,
  Bug = InternalError, Impossible, NoFiles, ConnectionRefused,
  NetworkFailure, UnknownError
}

Métodos públicos

 QSocketDevice (Type type=Stream)
 QSocketDevice (Type type, Protocol protocol, int dummy)
 QSocketDevice (int socket, Type type)
virtual ~QSocketDevice ()
bool isValid () const
Type type () const
Protocol protocol () const
int socket () const
virtual void setSocket (int socket, Type type)
bool open (int mode)
void close ()
void flush ()
Offset size () const
Offset at () const
bool at (Offset)
bool atEnd () const
bool blocking () const
virtual void setBlocking (bool)
bool addressReusable () const
virtual void setAddressReusable (bool)
int receiveBufferSize () const
virtual void setReceiveBufferSize (uint)
int sendBufferSize () const
virtual void setSendBufferSize (uint)
virtual bool connect (const QHostAddress &, Q_UINT16)
virtual bool bind (const QHostAddress &, Q_UINT16)
virtual bool listen (int backlog)
virtual int accept ()
Q_LONG bytesAvailable () const
Q_LONG waitForMore (int msecs, bool *timeout=0) const
Q_LONG readBlock (char *data, Q_ULONG maxlen)
Q_LONG writeBlock (const char *data, Q_ULONG len)
virtual Q_LONG writeBlock (const char *data, Q_ULONG len, const QHostAddress &host, Q_UINT16 port)
int getch ()
int putch (int)
int ungetch (int)
Q_UINT16 port () const
Q_UINT16 peerPort () const
QHostAddress address () const
QHostAddress peerAddress () const
Error error () const
 QSocketDevice (Type type=Stream)
 QSocketDevice (Type type, Protocol protocol, int dummy)
 QSocketDevice (int socket, Type type)
virtual ~QSocketDevice ()
bool isValid () const
Type type () const
Protocol protocol () const
int socket () const
virtual void setSocket (int socket, Type type)
bool open (int mode)
void close ()
void flush ()
Offset size () const
Offset at () const
bool at (Offset)
bool atEnd () const
bool blocking () const
virtual void setBlocking (bool)
bool addressReusable () const
virtual void setAddressReusable (bool)
int receiveBufferSize () const
virtual void setReceiveBufferSize (uint)
int sendBufferSize () const
virtual void setSendBufferSize (uint)
virtual bool connect (const QHostAddress &, Q_UINT16)
virtual bool bind (const QHostAddress &, Q_UINT16)
virtual bool listen (int backlog)
virtual int accept ()
Q_LONG bytesAvailable () const
Q_LONG waitForMore (int msecs, bool *timeout=0) const
Q_LONG readBlock (char *data, Q_ULONG maxlen)
Q_LONG writeBlock (const char *data, Q_ULONG len)
virtual Q_LONG writeBlock (const char *data, Q_ULONG len, const QHostAddress &host, Q_UINT16 port)
int getch ()
int putch (int)
int ungetch (int)
Q_UINT16 port () const
Q_UINT16 peerPort () const
QHostAddress address () const
QHostAddress peerAddress () const
Error error () const

Métodos protegidos

void setError (Error err)
void setError (Error err)

Descripción detallada

The QSocketDevice class provides a platform-independent low-level socket API.

network.

This class provides a low level API for working with sockets. Users of this class are assumed to have networking experience. For most users the QSocket class provides a much easier and high level alternative, but certain things (like UDP) can't be done with QSocket and if you need a platform-independent API for those, QSocketDevice is the right choice.

The essential purpose of the class is to provide a QIODevice that works on sockets, wrapped in a platform-independent API.

When calling connect() or bind(), QSocketDevice detects the protocol family (IPv4, IPv6) automatically. Passing the protocol family to QSocketDevice's constructor or to setSocket() forces creation of a socket device of a specific protocol. If not set, the protocol will be detected at the first call to connect() or bind().

Ver también:
QSocket, QSocketNotifier, QHostAddress

Documentación de las enumeraciones miembro de la clase

This enum type describes the error states of QSocketDevice.

NoError No error has occurred.

AlreadyBound The device is already bound, according to bind().

Inaccessible The operating system or firewall prohibited the action.

NoResources The operating system ran out of a resource.

InternalError An internal error occurred in QSocketDevice.

Impossible An attempt was made to do something which makes no sense. For example:

    ::close( sd->socket() );
    sd->writeBlock( someData, 42 );

The libc close() closes the socket, but QSocketDevice is not aware of this. So when you call writeBlock(), the impossible happens.

NoFiles The operating system will not let QSocketDevice open another file.

ConnectionRefused A connection attempt was rejected by the peer.

NetworkFailure There is a network failure.

UnknownError The operating system did something unexpected.

Valores de enumeraciones:
NoError 
AlreadyBound 
Inaccessible 
NoResources 
InternalError 
Bug 
Impossible 
NoFiles 
ConnectionRefused 
NetworkFailure 
UnknownError 
NoError 
AlreadyBound 
Inaccessible 
NoResources 
InternalError 
Bug 
Impossible 
NoFiles 
ConnectionRefused 
NetworkFailure 
UnknownError 
Valores de enumeraciones:
NoError 
AlreadyBound 
Inaccessible 
NoResources 
InternalError 
Bug 
Impossible 
NoFiles 
ConnectionRefused 
NetworkFailure 
UnknownError 
NoError 
AlreadyBound 
Inaccessible 
NoResources 
InternalError 
Bug 
Impossible 
NoFiles 
ConnectionRefused 
NetworkFailure 
UnknownError 
Valores de enumeraciones:
IPv4 
IPv6 
Unknown 
IPv4 
IPv6 
Unknown 

This enum type describes the protocol family of the socket. Possible values are:

IPv4 The socket is an IPv4 socket. IPv6 The socket is an IPv6 socket. Unknown The protocol family of the socket is not known. This can happen if you use QSocketDevice with an already existing socket; it tries to determine the protocol family, but this can fail if the protocol family is not known to QSocketDevice.

Ver también:
protocol() setSocket()
Valores de enumeraciones:
IPv4 
IPv6 
Unknown 
IPv4 
IPv6 
Unknown 
Valores de enumeraciones:
Stream 
Datagram 
Stream 
Datagram 

This enum type describes the type of the socket: Stream a stream socket (TCP, usually) Datagram a datagram socket (UDP, usually)

Valores de enumeraciones:
Stream 
Datagram 
Stream 
Datagram 

Documentación del constructor y destructor

QSocketDevice::QSocketDevice ( Type  type = Stream)

Creates a QSocketDevice object for a stream or datagram socket.

The type argument must be either QSocketDevice::Stream for a reliable, connection-oriented TCP socket, or QSocketDevice::Datagram for an unreliable UDP socket.

The socket is created as an IPv4 socket.

Ver también:
blocking() protocol()
QSocketDevice::QSocketDevice ( Type  type,
Protocol  protocol,
int  dummy 
)

Creates a QSocketDevice object for a stream or datagram socket.

The type argument must be either QSocketDevice::Stream for a reliable, connection-oriented TCP socket, or QSocketDevice::Datagram for an unreliable UDP socket.

The protocol indicates whether the socket should be of type IPv4 or IPv6. Passing Unknown is not meaningful in this context and you should avoid using (it creates an IPv4 socket, but your code is not easily readable).

The argument dummy is necessary for compatibility with some compilers.

Ver también:
blocking() protocol()
QSocketDevice::QSocketDevice ( int  socket,
Type  type 
)

Creates a QSocketDevice object for the existing socket socket.

The type argument must match the actual socket type; use QSocketDevice::Stream for a reliable, connection-oriented TCP socket, or QSocketDevice::Datagram for an unreliable, connectionless UDP socket.

QSocketDevice::~QSocketDevice ( ) [virtual]

Destroys the socket device and closes the socket if it is open.

QSocketDevice::QSocketDevice ( Type  type = Stream)
QSocketDevice::QSocketDevice ( Type  type,
Protocol  protocol,
int  dummy 
)
QSocketDevice::QSocketDevice ( int  socket,
Type  type 
)
virtual QSocketDevice::~QSocketDevice ( ) [virtual]

Documentación de las funciones miembro

int QSocketDevice::accept ( ) [virtual]

Extracts the first connection from the queue of pending connections for this socket and returns a new socket identifier. Returns -1 if the operation failed.

Ver también:
bind(), listen()
virtual int QSocketDevice::accept ( ) [virtual]
QHostAddress QSocketDevice::address ( ) const

Returns the address of this socket device. This may be 0.0.0.0 for a while, but is set to something sensible as soon as a sensible value is available.

QHostAddress QSocketDevice::address ( ) const
bool QSocketDevice::addressReusable ( ) const
bool QSocketDevice::addressReusable ( ) const

Returns TRUE if the address of this socket can be used by other sockets at the same time, and FALSE if this socket claims exclusive ownership.

Ver también:
setAddressReusable()
bool QSocketDevice::at ( Offset  ) [virtual]

The read/write index is meaningless for a socket, therefore this function does nothing and returns TRUE.

Reimplementado de QIODevice.

Offset QSocketDevice::at ( ) const [virtual]

Virtual function that returns the current I/O device position.

This is the position of the data read/write head of the I/O device.

Ver también:
size()

Reimplementado de QIODevice.

bool QSocketDevice::at ( Offset  pos) [virtual]

Virtual function that sets the I/O device position to pos. Returns TRUE if the position was successfully set, i.e. pos is within range and the seek was successful; otherwise returns FALSE.

Ver también:
size()

Reimplementado de QIODevice.

QIODevice::Offset QSocketDevice::at ( ) const [virtual]

The read/write index is meaningless for a socket, therefore this function returns 0.

Reimplementado de QIODevice.

bool QSocketDevice::atEnd ( ) const [virtual]

Virtual function that returns TRUE if the I/O device position is at the end of the input; otherwise returns FALSE.

Reimplementado de QIODevice.

bool QSocketDevice::atEnd ( ) const [virtual]

Returns TRUE if no data is currently available at the socket; otherwise returns FALSE.

Reimplementado de QIODevice.

bool QSocketDevice::bind ( const QHostAddress address,
Q_UINT16  port 
) [virtual]

Assigns a name to an unnamed socket. The name is the host address address and the port number port. If the operation succeeds, bind() returns TRUE; otherwise it returns FALSE without changing what port() and address() return.

bind() is used by servers for setting up incoming connections. Call bind() before listen().

virtual bool QSocketDevice::bind ( const QHostAddress ,
Q_UINT16   
) [virtual]
bool QSocketDevice::blocking ( ) const

Returns TRUE if the socket is valid and in blocking mode; otherwise returns FALSE.

Note that this function does not set error().

Atención:
On Windows, this function always returns TRUE since the ioctlsocket() function is broken.
Ver también:
setBlocking(), isValid()
bool QSocketDevice::blocking ( ) const
Q_LONG QSocketDevice::bytesAvailable ( ) const

Returns the number of bytes available for reading, or -1 if an error occurred.

Atención:
On Microsoft Windows, we use the ioctlsocket() function to determine the number of bytes queued on the socket. According to Microsoft (KB Q125486), ioctlsocket() sometimes returns an incorrect number. The only safe way to determine the amount of data on the socket is to read it using readBlock(). QSocket has workarounds to deal with this problem.
Q_LONG QSocketDevice::bytesAvailable ( ) const
void QSocketDevice::close ( void  ) [virtual]

Closes the socket and sets the socket identifier to -1 (invalid).

(This function ignores errors; if there are any then a file descriptor leakage might result. As far as we know, the only error that can arise is EBADF, and that would of course not cause leakage. There may be OS-specfic errors that we haven't come across, however.)

Ver también:
open()

Implementa QIODevice.

void QSocketDevice::close ( void  ) [virtual]

Closes the I/O device.

This virtual function must be reimplemented by all subclasses.

Ver también:
open()

Implementa QIODevice.

bool QSocketDevice::connect ( const QHostAddress addr,
Q_UINT16  port 
) [virtual]

Connects to the IP address and port specified by addr and port. Returns TRUE if it establishes a connection; otherwise returns FALSE. If it returns FALSE, error() explains why.

Note that error() commonly returns NoError for non-blocking sockets; this just means that you can call connect() again in a little while and it'll probably succeed.

virtual bool QSocketDevice::connect ( const QHostAddress ,
Q_UINT16   
) [virtual]
QSocketDevice::Error QSocketDevice::error ( ) const

Returns the first error seen.

Error QSocketDevice::error ( ) const
void QSocketDevice::flush ( ) [virtual]

The current QSocketDevice implementation does not buffer at all, so this is a no-op.

Implementa QIODevice.

void QSocketDevice::flush ( ) [virtual]

Flushes an open I/O device.

This virtual function must be reimplemented by all subclasses.

Implementa QIODevice.

int QSocketDevice::getch ( ) [virtual]

Reads a single byte/character from the I/O device.

Returns the byte/character read, or -1 if the end of the I/O device has been reached.

This virtual function must be reimplemented by all subclasses.

Ver también:
putch(), ungetch()

Implementa QIODevice.

int QSocketDevice::getch ( ) [virtual]
Atención:
getch() is implemented as a one-byte readBlock(), so it may be very slow if you call it more than a few times.
Ver también:
putch() readBlock()

Implementa QIODevice.

bool QSocketDevice::isValid ( ) const
bool QSocketDevice::isValid ( void  ) const

Returns TRUE if this is a valid socket; otherwise returns FALSE.

Ver también:
socket()
bool QSocketDevice::listen ( int  backlog) [virtual]

Specifies how many pending connections a server socket can have. Returns TRUE if the operation was successful; otherwise returns FALSE. A backlog value of 50 is quite common.

The listen() call only applies to sockets where type() is Stream, i.e. not to Datagram sockets. listen() must not be called before bind() or after accept().

Ver también:
bind(), accept()
virtual bool QSocketDevice::listen ( int  backlog) [virtual]
bool QSocketDevice::open ( int  mode) [virtual]

Opens the I/O device using the specified mode. Returns TRUE if the device was successfully opened; otherwise returns FALSE.

The mode parameter mode must be an OR'ed combination of the following flags. Mode flags Meaning IO_Raw specifies raw (unbuffered) file access. IO_ReadOnly opens a file in read-only mode. IO_WriteOnly opens a file in write-only mode. IO_ReadWrite opens a file in read/write mode. IO_Append sets the file index to the end of the file. IO_Truncate truncates the file. IO_Translate enables carriage returns and linefeed translation for text files under MS-DOS, Windows and Macintosh. On Unix systems this flag has no effect. Use with caution as it will also transform every linefeed written to the file into a CRLF pair. This is likely to corrupt your file if you write write binary data. Cannot be combined with IO_Raw.

This virtual function must be reimplemented by all subclasses.

Ver también:
close()

Implementa QIODevice.

bool QSocketDevice::open ( int  mode) [virtual]

Opens the socket using the specified QIODevice file mode. This function is called from the QSocketDevice constructors and from the setSocket() function. You should not call it yourself.

Ver también:
close().

Implementa QIODevice.

QHostAddress QSocketDevice::peerAddress ( ) const

Returns the address of the port this socket device is connected to. This may be 0.0.0.0 for a while, but is set to something sensible as soon as a sensible value is available.

Note that for Datagram sockets, this is the source port of the last packet received.

QHostAddress QSocketDevice::peerAddress ( ) const
Q_UINT16 QSocketDevice::peerPort ( ) const

Returns the port number of the port this socket device is connected to. This may be 0 for a while, but is set to something sensible as soon as a sensible value is available.

Note that for Datagram sockets, this is the source port of the last packet received, and that it is in native byte order.

Q_UINT16 QSocketDevice::peerPort ( ) const
Q_UINT16 QSocketDevice::port ( ) const

Returns the port number of this socket device. This may be 0 for a while, but is set to something sensible as soon as a sensible value is available.

Note that Qt always uses native byte order, i.e. 67 is 67 in Qt; there is no need to call htons().

Q_UINT16 QSocketDevice::port ( ) const
Protocol QSocketDevice::protocol ( ) const
QSocketDevice::Protocol QSocketDevice::protocol ( ) const

Returns the socket's protocol family, which is one of Unknown, IPv4, or IPv6.

QSocketDevice either creates a socket with a well known protocol family or it uses an already existing socket. In the first case, this function returns the protocol family it was constructed with. In the second case, it tries to determine the protocol family of the socket; if this fails, it returns Unknown.

Ver también:
Protocol setSocket()
int QSocketDevice::putch ( int  ch) [virtual]

Writes the character ch to the I/O device.

Returns ch, or -1 if an error occurred.

This virtual function must be reimplemented by all subclasses.

Ver también:
getch(), ungetch()

Implementa QIODevice.

int QSocketDevice::putch ( int  ch) [virtual]
Atención:
putch() is implemented as a one-byte writeBlock(), so it may be very slow if you call it more than a few times.
Ver también:
getch()

Implementa QIODevice.

Q_LONG QSocketDevice::readBlock ( char *  data,
Q_ULONG  maxlen 
) [virtual]

Reads at most maxlen bytes from the I/O device into data and returns the number of bytes actually read.

This function should return -1 if a fatal error occurs and should return 0 if there are no bytes to read.

The device must be opened for reading, and data must not be 0.

This virtual function must be reimplemented by all subclasses.

Ver también:
writeBlock() isOpen() isReadable()

Implementa QIODevice.

Q_LONG QSocketDevice::readBlock ( char *  data,
Q_ULONG  maxlen 
) [virtual]

Reads maxlen bytes from the socket into data and returns the number of bytes read. Returns -1 if an error occurred. Returning 0 is not an error. For Stream sockets, 0 is returned when the remote host closes the connection. For Datagram sockets, 0 is a valid datagram size.

Implementa QIODevice.

int QSocketDevice::receiveBufferSize ( ) const

Returns the size of the operating system receive buffer.

Ver también:
setReceiveBufferSize()
int QSocketDevice::receiveBufferSize ( ) const
int QSocketDevice::sendBufferSize ( ) const

Returns the size of the operating system send buffer.

Ver también:
setSendBufferSize()
int QSocketDevice::sendBufferSize ( ) const
void QSocketDevice::setAddressReusable ( bool  enable) [virtual]

Sets the address of this socket to be usable by other sockets too if enable is TRUE, and to be used exclusively by this socket if enable is FALSE.

When a socket is reusable, other sockets can use the same port number (and IP address), which is generally useful. Of course other sockets cannot use the same (address,port,peer-address,peer-port) 4-tuple as this socket, so there is no risk of confusing the two TCP connections.

Ver también:
addressReusable()
virtual void QSocketDevice::setAddressReusable ( bool  ) [virtual]
virtual void QSocketDevice::setBlocking ( bool  ) [virtual]
void QSocketDevice::setBlocking ( bool  enable) [virtual]

Makes the socket blocking if enable is TRUE or nonblocking if enable is FALSE.

Sockets are blocking by default, but we recommend using nonblocking socket operations, especially for GUI programs that need to be responsive.

Atención:
On Windows, this function should be used with care since whenever you use a QSocketNotifier on Windows, the socket is immediately made nonblocking.
Ver también:
blocking(), isValid()
void QSocketDevice::setError ( Error  err) [protected]
void QSocketDevice::setError ( Error  err) [protected]

Allows subclasses to set the error state to err.

void QSocketDevice::setReceiveBufferSize ( uint  size) [virtual]

Sets the size of the operating system receive buffer to size.

The operating system receive buffer size effectively limits two things: how much data can be in transit at any one moment, and how much data can be received in one iteration of the main event loop.

The default is operating system-dependent. A socket that receives large amounts of data is probably best with a buffer size of 49152.

virtual void QSocketDevice::setReceiveBufferSize ( uint  ) [virtual]
void QSocketDevice::setSendBufferSize ( uint  size) [virtual]

Sets the size of the operating system send buffer to size.

The operating system send buffer size effectively limits how much data can be in transit at any one moment.

The default is operating system-dependent. A socket that sends large amounts of data is probably best with a buffer size of 49152.

virtual void QSocketDevice::setSendBufferSize ( uint  ) [virtual]
virtual void QSocketDevice::setSocket ( int  socket,
Type  type 
) [virtual]
void QSocketDevice::setSocket ( int  socket,
Type  type 
) [virtual]

Sets the socket device to operate on the existing socket socket.

The type argument must match the actual socket type; use QSocketDevice::Stream for a reliable, connection-oriented TCP socket, or QSocketDevice::Datagram for an unreliable, connectionless UDP socket.

Any existing socket is closed.

Ver también:
isValid(), close()
Offset QSocketDevice::size ( ) const [virtual]

Virtual function that returns the size of the I/O device.

Ver también:
at()

Implementa QIODevice.

QIODevice::Offset QSocketDevice::size ( ) const [virtual]

The size is meaningless for a socket, therefore this function returns 0.

Implementa QIODevice.

int QSocketDevice::socket ( ) const
int QSocketDevice::socket ( ) const

Returns the socket number, or -1 if it is an invalid socket.

Ver también:
isValid(), type()
QSocketDevice::Type QSocketDevice::type ( ) const

Returns the socket type which is either QSocketDevice::Stream or QSocketDevice::Datagram.

Ver también:
socket()
Type QSocketDevice::type ( ) const
int QSocketDevice::ungetch ( int  ch) [virtual]

Puts the character ch back into the I/O device and decrements the index position if it is not zero.

This function is normally called to "undo" a getch() operation.

Returns ch, or -1 if an error occurred.

This virtual function must be reimplemented by all subclasses.

Ver también:
getch(), putch()

Implementa QIODevice.

int QSocketDevice::ungetch ( int  ) [virtual]

This implementation of ungetch returns -1 (error). A socket is a sequential device and does not allow any ungetch operation.

Implementa QIODevice.

Q_LONG QSocketDevice::waitForMore ( int  msecs,
bool timeout = 0 
) const
Q_LONG QSocketDevice::waitForMore ( int  msecs,
bool timeout = 0 
) const

Wait up to msecs milliseconds for more data to be available. If msecs is -1 the call will block indefinitely.

Returns the number of bytes available for reading, or -1 if an error occurred.

If timeout is non-null and no error occurred (i.e. it does not return -1): this function sets *timeout to TRUE, if the reason for returning was that the timeout was reached; otherwise it sets *timeout to FALSE. This is useful to find out if the peer closed the connection.

Atención:
This is a blocking call and should be avoided in event driven applications.
Ver también:
bytesAvailable()
virtual Q_LONG QSocketDevice::writeBlock ( const char *  data,
Q_ULONG  len,
const QHostAddress host,
Q_UINT16  port 
) [virtual]
Q_LONG QSocketDevice::writeBlock ( const char *  data,
Q_ULONG  len 
) [virtual]

Writes len bytes to the socket from data and returns the number of bytes written. Returns -1 if an error occurred.

This is used for QSocketDevice::Stream sockets.

Implementa QIODevice.

Q_LONG QSocketDevice::writeBlock ( const char *  data,
Q_ULONG  len 
) [virtual]

Writes len bytes from data to the I/O device and returns the number of bytes actually written.

This function should return -1 if a fatal error occurs.

This virtual function must be reimplemented by all subclasses.

Ver también:
readBlock()

Implementa QIODevice.

Q_LONG QSocketDevice::writeBlock ( const char *  data,
Q_ULONG  len,
const QHostAddress host,
Q_UINT16  port 
) [virtual]

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Writes len bytes to the socket from data and returns the number of bytes written. Returns -1 if an error occurred.

This is used for QSocketDevice::Datagram sockets. You must specify the host and port of the destination of the data.


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