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| Related Concepts | Other Library Functions | |||||||||
| function | TCPConnectionGetSource |
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Library: omtcp - TCP/IP client and server support
Include: omtcp.xin |
Return type: Opaque Returns: An external source object. |
define external source function TCPConnectionGetSource
value TCPConnection this-TCPConnection
timeout value integer timeout-in-milliseconds optional
protocol value IOProtocol this-IOProtocol optional
as TCPConnectionGetSource
This function returns an external source object from which data will be read.
If the passed TCP connection object is closed or was never connected, then this function returns a dummy external source object that immediately returns "end of input". At the same time, it sets the TCP connection object to be in error.
The timeout value applies primarily to data read from the returned external source.
TCPConnectionGetSource can be called more than once for a connection. All such derived sources read from the same source attachment, but such sources are subject to read-ahead, and it is generally the case that a read from a source will actually capture more data than is needed for immediate use. This means that if there are two or more sources derived from a connection, it is usually the case that data read from one such source is not that which immediately follows that read from another such source. As a consequence, only ONE external source can be derived from a connection at a time. That is, sources must be derived serially.
If a TCP connection from which an external source is derived is closed using TCPConnectionClose, then it is in error to perform a read from the source. The TCP connection object is made to be in error, and the source returns "end of input", as it does for other errors.
Arguments:
Example:
local TCPConnection TCP-Conn
local stream s
set TCP-Conn to TCPConnectionOpen on "localhost" at 5300
TCPConnectionSetBuffering TCP-Conn enabled false
open s with binary-mode as
TCPConnectionGetOutput TCP-Conn
protocol IOProtocolMultiPacket
put s "hello world"
close s
output TCPConnectionGetSource TCP-Conn
protocol IOProtocolMultiPacket
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