com_get_active_object --
Returns a handle to an already running instance of a COM object
Syntax
variant com_get_active_object ( string progid [, int code_page] )
com_get_active_object() is similar to creating a new
instance of a COM 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.
progid must be either the ProgID or CLSID for the
object that you want to access (for example
Word.Application). code_page
acts in precisely the same way that it does for the COM class.
If the requested object is running, it will be returned to your script
just like any other COM object. Otherwise a com_exception
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
MK_E_UNAVAILABLE; you can use the
getCode method of the exception object to check the
exception code.
Warning
Using com_get_active_object() 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 Considerations for Server-Side
Automation of Office for more information on the general issues
involved.
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