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Editorial Team
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Asked: 2026-05-30T01:28:04+00:00

I’m just curious – QTP has the functionality to call .NET objects directly via

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I’m just curious – QTP has the functionality to call .NET objects directly via the DotNetFactory object, see this article from learnqtp.com, but it can also call objects through COM (see this post from Joe Colantonio). What would the advantage be in using one method over another? So far as I can tell, both methods have similar restrictions on the objects that can be called (no constructors with parameters, etc.), but I’m wondering about deeper details.

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  1. Editorial Team

    First of all one of your assumptions is wrong, DotNetFactory does support calling constructors with parameters (that’s what the optional args parameter is for).

    The CreateObject function is built in for VBScript, since QTP tests are written in VBScript this functionality comes for free and is not technically a QTP feature. The DotNetFactory is part of QTP and allows creating .NET objects even if they are not COM visible.

    If you have a .NET object which is COM visible you can choose which method you’re more comfortable with but if you have a COM object you must use CreateObject and if you have a non-COM visible object you must use DotNetFactory.

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