GetSocketObject (Socket function): Difference between revisions
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{{Template:Socket:GetSocketObject subtitle}} | {{Template:Socket:GetSocketObject subtitle}} | ||
<var>GetSocketObject</var> returns a <var>Socket</var> object for a given socket number. | |||
It returns a reference to an instance of a <var>Socket</var> object, which can then be used with instance method calls. | |||
It returns a reference to an instance of a | |||
<var>Socket</var> object, which can then be used with instance method calls. | |||
==Syntax== | ==Syntax== | ||
| Line 15: | Line 13: | ||
</td></tr> | </td></tr> | ||
<tr><th><var>%(Socket)</var></th> | <tr><th><var>%(Socket)</var></th> | ||
<td>The class name in parentheses denotes a | <td>The optional class name in parentheses denotes a [[Notation conventions for methods#Shared methods and constructors|virtual constructor]] method. See "Usage notes," below, for more information about invoking a <var>Socket</var>constructor.</td></tr> | ||
<tr><th>number</th> | <tr><th>number</th> | ||
<td>The number of a socket that was created with <var>[[$Sock_Conn]]</var>. | <td>The number of a socket that was created with <var>[[$Sock_Conn]]</var>. | ||
| Line 23: | Line 22: | ||
==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li><var>GetSocketObject</var> is a [[Object variables#Virtual Constructor methods|virtual constructor]] and as such can be called with no method object, with an explicit class name, or with an object variable, even if that object is null: | |||
<p class="code">%sock = GetSocketObject(<var class="term">num</var>) | |||
%sock = %(Socket):GetSocketObject(<var class="term">num</var>) | |||
%sock = %sock:GetSocketObject(<var class="term">num</var>) | |||
</p> | |||
<li><var>GetSocketObject</var> is designed for adding <var>Socket</var> object code to an existing | <li><var>GetSocketObject</var> is designed for adding <var>Socket</var> object code to an existing | ||
$Sock_xxx application, that is, for | $Sock_xxx application, that is, for | ||
Revision as of 01:53, 22 November 2011
Get a socket object for the given socket number (Socket class)
GetSocketObject returns a Socket object for a given socket number.
It returns a reference to an instance of a Socket object, which can then be used with instance method calls.
Syntax
%socket = [%(Socket):]GetSocketObject( number)
Syntax terms
| %socket | A declared socket object or a reference to a Socket object. |
|---|---|
| %(Socket) | The optional class name in parentheses denotes a virtual constructor method. See "Usage notes," below, for more information about invoking a Socketconstructor. |
| number | The number of a socket that was created with $Sock_Conn. |
Usage notes
- GetSocketObject is a virtual constructor and as such can be called with no method object, with an explicit class name, or with an object variable, even if that object is null:
%sock = GetSocketObject(num) %sock = %(Socket):GetSocketObject(num) %sock = %sock:GetSocketObject(num)
- GetSocketObject is designed for adding Socket object code to an existing $Sock_xxx application, that is, for instantiating a socket from a socket number returned from $Sock_Conn. If you are building an entirely object-oriented socket application, use the New constructor.
- After GetSocketObject returns, the socket is no longer accessible by its socket number. To access the socket by its number again, use GetSocketNumber.
- If the object returned by a GetSocketObject invocation is the method object
for a subsequent GetSocketNumber invocation, the
NOCLOSEsetting of the original numbered socket is applied to the numbered socket returned by GetSocketNumber. For information about NOCLOSE, see Set.
Example
In the following example,a socket created with $Sock_Conn is converted to a Socket object.
JANUS DEFINE PIPE * CLSOCK 8 REMOTE * * SOCKPMAX 10 JANUS START PIPE Begin %nums Is String Len 16 %sockhrb object Socket %CONN is float %CONN = $SOCK_CONN('PIPE', 'www.whrb.org', 80) %nums = %(Socket):Num('OPEN') %sockhrb = %(Socket):GetSocketObject(%nums) Print 'The %sockhrb status is: ' %sockhrb:Info('STAT') End
The example result is:
The %sockhrb status is: CONN