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Unable to debug VB COM object from ASP.NET
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This message was discovered on ASPFriends.com 'aspngdebug' list.


Michael Lang
We have a VB6 COM object that we've developed that we're accessing from an ASP.NET application. Whilst debugging an ASP.NET application we are getting an exception when we attempt to step from the .NET debugger into the COM object in VB6 (ie... by running the COM control within VB6 with a break point set). It doesn't seem like .NET can resolve the COM object whilst it's being run in VB. The exception is as follows:-

System.InvalidCastException: QueryInterface for interface OurComInteropNamespace._aClassFromOurCOMObject failed

This exception only occurs when we attempt to debug the COM in VB6 whilst debugging the ASP.NET application calling it.
Has anyone else encountered such a problem ?

Is there a work around ?

Michael Lang
Fusion Technology Group
Phone: +61 (0)417 498 620
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Ries Vriend
I've got the same problem. The only workaround I know of is declaring
all your COM object references in VB.NET 'As Object', disable 'option
strict' and thus use late-binding. Big drawback is that you cannot pass
UDT's/structs from VB6 to .net using late binding.

Hope this helps.

Ries

-----Original Message-----
From: Michael Lang [mailto:Click here to reveal e-mail address]
Sent: vrijdag 26 juli 2002 11:54
To: aspngdebug
Subject: [aspngdebug] Unable to debug VB COM object from ASP.NET

We have a VB6 COM object that we've developed that we're accessing from
an ASP.NET application. Whilst debugging an ASP.NET application we are
getting an exception when we attempt to step from the .NET debugger into
the COM object in VB6 (ie... by running the COM control within VB6 with
a break point set). It doesn't seem like .NET can resolve the COM
object whilst it's being run in VB. The exception is as follows:-

System.InvalidCastException: QueryInterface for interface
OurComInteropNamespace._aClassFromOurCOMObject failed

This exception only occurs when we attempt to debug the COM in VB6
whilst debugging the ASP.NET application calling it.
Has anyone else encountered such a problem ?

Is there a work around ?
Michael Lang
Fusion Technology Group
Phone: +61 (0)417 498 620

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System.InvalidCastException




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