Other Library Functions

tcp-get

function

Library: TCP/IP client and server support (OMTCP legacy, OmniMark versions 6.0.2 - 7.0)
Include: omtcp.xin

Returns:


Declaration 
define external stream function tcp-get
                value tcp-connection Connection
           size value integer        MinRead    optional
    variable-to value integer        MaxRead    optional
        timeout value integer        ms         optional

Argument definitions

Connection
is a tcp-connection object representing an existing connection.
MinRead
is the minimum number of characters to read.
MaxRead
is the maximum number of characters to read.
ms
is how long the function will wait for at least one character, expressed in milliseconds.


Purpose

Use tcp-get to return characters received from a source on the TCP connection object.

Requirements

You must include the following line at the beginning of your OmniMark program: 

  include "omtcp.xin"

Connection must represent an existing connection (else external exception TCP05).

There must not be an active external source derived from Connection with tcp-source (else external exception TCP04).

If MinRead is specified, it must have a value of -1 or greater (else external exception TCP03).

If MaxRead is specified, it must have a value of -1 or greater (else external exception TCP03).

If both MinRead and MaxRead are specified, MinRead must have a value less than the value of MaxRead (else external exception TCP03).

Usage Notes

If an error occurs during the read, external exception TCP11 is thrown.

If the read operation times out, external exception TCP07 is thrown.

If neither MinRead nor MaxRead is specified the function reads as many characters as are available, as long as there is at least one character.

Specifying value of -1 for either MinRead or MaxRead indicates no limit. (This is the default value for both parameters.)

Sequential uses of tcp-get and tcp-source are allowed. It is also guaranteed that tcp-get will only ever read the characters it returns from a source. Any following characters are available to the next tcp-get or tcp-source.

Example #1 


  local tcp-connection Connection-1
  
     set Connection-1 to tcp-connect on "localhost" at 5300
     output tcp-get Connection-1

Example #2 


     output tcp-get tcp-connect on "localhost" at 5300
        size 10

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