This class represents an TCP/IP socket. It extendes the basic semantics of sockets to allow non-blocking or time constrained operations.

Callback WhenWait

If this callback is defined, it is invoked periodically while TcpSocket performs any operations, with the frequency 50Hz. This is intended to give user feedback in interactive applications.

static String GetHostName()

Returns the name of computer.

Returns number of bytes processed during current operation; intended to be called from WhenWait routine

Returns true if socket is open.

Returns true if connection was closed and all peer data were processed.

Returns true if some previous operations reported error. In that case, all subsequent request are ignored.

Clears the error state.

Returns errorcode. Errorcodes are either defined by SOCKET API or it can be -1 for other errors.

String GetErrorDesc() const

Returns description of error.

Sets TcpSocket to aborted state. In aborted state, all subsequent request are ignored. Intended to be called from WhenWait routine.

Returns true is TcpSocket is in aborted state.

Clears the aborted state.

SOCKET GetSOCKET() const

Returns socket handle. Note that all TcpSocket sockets are non-blocking from host OS perspective.

String GetPeerAddr() const

Returns the peer address.

void Attach(SOCKET socket)

Attaches socket to TcpSocket. socket must be in non-blocking state.

Connects socket to server at host:port. This operation is blocking.

bool Connect(IpAddrInfo& info)

Connects socket to server found at info. Non-blocking.

Starts a listening server socket at port with input queue listen_count. ipv6 sets the socket to IPv6 mode, reuse sets SO_REUSEADDR socket option.

bool Accept(TcpSocket& listen_socket)

Accepts a connection from listen_socket.

Closes the socket.

Performs shutdown for write operations. Normally not needed.

Sets TCP_NODELAY option.

Sets SO_LINGER option to msecs. If msecs is Null, switches SO_LINGER off.

Same as Linger(Null).

bool Wait(dword events)

Waits for at most timeout for events, which can be a combination of WAIT_READ (wait for more input bytes available), WAIT_WRITE (wait till it is possible to write something to socket). Wait also always returns when socket exception happens.

Same as Wait(WAIT_READ).

Same as Wait(WAIT_WRITE).

Returns the next input byte without actually removing it from input queue. It at most waits for specified timeout for it, if there is still none, returns -1.

Reads the next input byte. It at most waits for specified timeout for it, if there is still none, returns -1.

Reads at most len bytes into buffer, trying to do so at most for specified timeout. Returns the number of bytes actually read.

String Get(int len)

Reads at most len bytes, trying to do so at most for specified timeout. Returns a String with read data.

Writes at most len bytes from buffer, trying to do so at most for specified timeout. Returns the number of bytes actually written.

int Put(const String& s)

Writes s, trying to do so at most for specified timeout. Returns the number of bytes actually written.

Reads exactly len bytes into buffer. If such number of bytes cannot be read until timeout, returns false and sets timeout error for TcpSocket.

String GetAll(int len)

Reads exactly len bytes. If such number of bytes cannot be read until timeout, returns String::GetVoid() and sets timeout error for TcpSocket.

String GetLine(int maxlen = 65536)

Reads single line (ended with '\n', '\r' is ignored). If the whole line cannot be read within timeout or line length is longer than maxlen sets error and returns String::GetVoid().

Outputs exactly len bytes. If such number of bytes cannot be written in time specified by timeout, sets error and returns false.

bool PutAll(const String& s)

Outputs the whole String. If such number of bytes cannot be written in time specified by timeout, sets error and returns false.

Sets TcpSocket to SSL mode and starts SSL handshake. Core/SSL must be present in project. Returns true if SSL could have been started. Handshake is not finished until SSLHandshake returns false.

Returns true if TcpSocket is in SSL mode.

Attempts the progress on SSL handshake for at most timeout period. Returns true if SSL handshake is (still) in progress.

void SSLCertificate(const String& cert, const String& pkey, bool asn1)

Sets the SSL certificate. Must be called before StartSSL. (Note that clients usually do not need certificates, this is usually used on accepting sockets.)

const SSLInfo *GetSSLInfo() const

Returns information about established (after handshake) SSL connection or NULL if such information is not available.

TcpSocket& Timeout(int ms)

Sets timeout for all operations. Zero means that all operations return immediatelly (in that case it is usually a good idea to perform some sort of external blocking on socket or socket group using e.g. SocketWaitEvent). Null means operations are blocking (but they still can invoke WhenProgress periodically if defined). Other values specify a number of milliseconds. Note: It is possible to adjust timeout before any single TcpSocket operation. Returns *this.

Returns current timeout.

TcpSocket& GlobalTimeout(int ms)

Sets the "global timeout". This timeout is in effect over a whole range of operations, until it is canceled by calling this method with Null parameter. If global timeout is exceeded, operation during which it happened fails and socket error code is set to ERROR_GLOBAL_TIMEOUT.

TcpSocket& NoGlobalTimeout()

Same as GlobalTimeout(Null).

TcpSocket& Blocking()

Same as Timeout(Null). Returns *this.

TcpSocket& WaitStep(int ms)

Sets the periodicity of calling WhenWait in millisecond between calls. Default is 10ms (100hz).

Retruns current periodicity of calling WhenWait.

Constructor, destructor.

This structure is used to pass information about established SSL connection.

String cipher

Cipher used.

Certificate is available.

String cert_subject

Subject name.

String cert_issuer

Issuer name.

Date cert_notbefore

Certificate is not valid before this date.

Date cert_notafter

Certificate is not valid after this date.

Version of certificate.

String cert_serial

Serial number of certificate.

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