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Request #35339 COM "As" behaviour
Submitted: 2005-11-22 21:17 UTC Modified: 2019-12-29 04:22 UTC
From: amir at foresthc dot com Assigned: cmb (profile)
Status: No Feedback Package: COM related
PHP Version: Next Minor Version OS: Windows
Private report: No CVE-ID: None
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From: amir at foresthc dot com
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 [2005-11-22 21:17 UTC] amir at foresthc dot com
Description:
------------
In visual basic it is possible to declare a variable as a pointer to a certain type of object, but not instanciate it yet.

I have run into a problem using a 3rd party COM library, where it is neccessary to pass such an empty pointer by ref to a method, in order to get an instance or another class.

Reproduce code:
---------------
// This code is not real, it's just to illustrate the problem:

$factory = new COM('Example.Factory');

// Here we have several options, none of which work:
$product = new VARIANT;
$product = new COM('Example.Product');
variant_set_type($product, VT_EMPTY);

// Whatever I have done in the previous lines, this method fails. If it gets an instance of an instance of an object - it fails. If it gets anything that is not of type Example.Product, it fails.
$factory->Create_Product($product);

Expected result:
----------------
Here is the "equivalent" VB code that works:

Dim objFactory As Example.Factory
Dim objProduct As Example.Product
// Any of these would fail:
Dim objProduct As New Example.Product
Dim objProduct As Variant

Sub Main()
    Set objFactory = new Example.Factory
    objFactory.Create_Product(objProduct)
End Sub

Actual result:
--------------
The Create_Product method will fail if it does not recieve the equivalent of the line: "Dim objProduct As Example.Product". Which as far as I can understand, is not possible to supply it with at this point.

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-01-08 23:55 UTC] ajf@php.net
-Package: Feature/Change Request +Package: COM related
 [2019-10-18 11:43 UTC] girgias@php.net
-PHP Version: 5.0.5 +PHP Version: Next Minor Version -Assigned To: +Assigned To: cmb
 [2019-10-18 11:43 UTC] girgias@php.net
Assigning to cmb as he's the new maintainer for COM
 [2019-12-16 08:55 UTC] cmb@php.net
-Status: Assigned +Status: Feedback
 [2019-12-16 08:55 UTC] cmb@php.net
Is this feature request still relevant?  It seems to me that this
pattern (having a factory using an out parameter instead of
returning the instantiated object) is rather uncommon, and as such
it might not be worthwhile to add support for it.
 [2019-12-29 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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