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>com_get_active_object</H1
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> (PHP 5)</P
>com_get_active_object --
Returns a handle to an already running instance of a COM object
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><H2
>Description</H2
>variant <B
CLASS="methodname"
>com_get_active_object</B
> ( string progid [, int code_page] )<BR
></BR
><P
> <B
CLASS="function"
>com_get_active_object()</B
> is similar to creating a new
instance of a <A
HREF="class.com.html"
>COM</A
> object, except that it will
only return an object to your script if the object is already running.
OLE applications use something known as the Running Object Table to
allow well-known applications to be launched only once; this function
exposes the COM library function GetActiveObject() to get a handle on a
running instance.
</P
><P
> <CODE
CLASS="parameter"
>progid</CODE
> must be either the ProgID or CLSID for the
object that you want to access (for example
<TT
CLASS="literal"
>Word.Application</TT
>). <CODE
CLASS="parameter"
>code_page</CODE
>
acts in precisely the same way that it does for the <A
HREF="class.com.html"
>COM</A
> class.
</P
><P
> If the requested object is running, it will be returned to your script
just like any other COM object. Otherwise a <TT
CLASS="literal"
>com_exception</TT
>
will be raised. There are a variety of reasons why
this function might fail, the most common being that the object is not
already running. In that situation, the exception error code will be
<TT
CLASS="constant"
><B
>MK_E_UNAVAILABLE</B
></TT
>; you can use the
<TT
CLASS="literal"
>getCode</TT
> method of the exception object to check the
exception code.
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> Using <B
CLASS="function"
>com_get_active_object()</B
> in a web server context
is not always a smart idea. Most COM/OLE applications are not designed
to handle more than one client concurrently, even (or especially!)
Microsoft Office. You should read <A
HREF="http://support.microsoft.com/default.aspx?scid=kb;EN-US;q257757"
TARGET="_top"
>Considerations for Server-Side
Automation of Office</A
> for more information on the general issues
involved.
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