Socket (gb.net)
This class implements a socket client to allow your programs to connect with socket servers. TCP and Local (Unix sockets) connections are implemented.
Properties
Host
|
The host to which you would like to connect.
|
LocalHost
|
Once a TCP connection is established, this property reflects local IP used by this connection.
|
LocalPort
|
Once a TCP connection is established, this property reflects local port (1-65535) used by this connection.
|
Path
|
Return or set the path of the local socket you want to connect.
|
Port
|
The port to which you would like to connect on the remote host.
|
RemoteHost
|
Once a TCP connection is established, this property reflects remote IP used by this connection.
|
RemotePort
|
Once a TCP connection is established, this property reflects remote port (1-65535) used by this connection.
|
Server
|
If that socket has been created by the Accept method of a ServerSocket,
then return that ServerSocket object.
|
Status
|
Reflects the current status of a Socket object.
|
StatusText
|
Return the status of the socket as a string.
|
Timeout
|
Return or set the timeout of the socket, in milliseconds.
|
Inherited properties
Blocking
|
Returns or sets if the stream is blocking.
|
ByteOrder
|
Returns or sets the byte order used to read or write binary data to the stream.
|
EndOfFile
|
This property signals whether the last use of LINE INPUT reached the end of file,
instead of reading a full line with an end-of-line character.
|
EndOfLine
|
Return or set the newline separator used by this stream.
|
Eof
|
Return if a stream reached its end.
|
Handle
|
Returns the system file descriptor associated with this Stream.
|
IsTerm
|
Return if a stream is associated with a terminal.
|
Lines
|
Returns a virtual object that allows you to enumerate a stream line by line.
|
NoShare
|
|
NullTerminatedString
|
Return or set if strings are null-terminated when they are serialized.
|
Tag
|
Returns or sets the tag associated with the stream.
|
Term
|
Return a virtual object that allows to manage the terminal associated with the stream.
|
Methods
Connect
|
Use this method to establish a TCP or Local (Unix) connection with a remote TCP or Local server.
|
Peek
|
This function allows you to receive data from Socket.
|
Inherited methods
Begin
|
Start to buffer data written to the stream, so that everything will be sent when the Send method is called.
|
Close
|
Closes the stream.
|
Drop
|
Drop the data that has been buffered since the last call to the Begin method.
|
ReadLine
|
Read a line of text from the stream, like the LINE INPUT instruction.
|
Send
|
Send all the data, in one shot, since the last call to Begin.
|
Watch
|
Start or stop watching the stream file descriptor for reading or writing, after it has been opened.
|
Events
Closed
|
This event raises after the remote side of the socket has closed the connection.
|
Error
|
This event raises when some failed (for instance remote host refused connection).
|
Found
|
When connecting using TCP sockets, first step is to translate host name to host IP. The object will raise this event when this part of the connection process has been finished
|
Read
|
This event raises when data arrives to the socket from the other side of connection.
|
Ready
|
This event raises after a connection has been established successfully.
|
Write
|
This event is raised when the internal socket send buffers can take in more data.
|
This class performs its work asynchronously, so the program will not be stopped while connecting, sending or receiving data.
This class is derived from the class
Stream, so you can use standard
Stream & Input/Output functions to send and receive data, and to close the socket.
Sockets can be used if the library "gb.net" is included in the project.
To include this library use the menu [Project] [Properties] [Components] and tick the component "gb.net".
Example
' Gambas class file
PUBLIC MySock AS Socket
PUBLIC SUB Button1_Click()
DIM sBuf AS String
MySock = NEW Socket
MySock.Connect("localhost", 7000)
DO WHILE (MySock.Status <> Net.Connected) AND (MySock.Status > 0)
WAIT 0.1
LOOP
IF MySock.Status <> Net.connected THEN
PRINT "Error"
QUIT
END IF
sBuf = "Hello over there.\n"
WRITE #MySock, sBuf, Len(sBuf)
DO WHILE Lof(MySock) = 0
WAIT 0.1
LOOP
READ #MySock, sBuf, Lof(MySock)
PRINT sBuf
CLOSE #MySock
END
Remarks on that example:
-
Even though polling is shown here, you should really use callbacks to react on different states.
-
See Network Programming, the tutorial about the usage of networking. There are comments to each line of this example.
-
There is another example in the distribution under Networking: ClientSocket.