How to use VB6 dl in ASP.net application.

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Hi,

I am using vb6 dll in my Asp.net 4.0 application,it works fine while running in VS mode but if i host the application into IIS it doesn't work.

Even though i did all stuff like registering in sysWoW64 as regsvr32.

Kindly anyone give the idea for this.

regards,
kannappan

Posted 17-Mar-15 3:20am

anbucode01

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Maciej Los 17-Mar-15 9:21am

In a few words: You can't!

anbucode01 17-Mar-15 9:54am

It works in the VS then why cant we host in IIS?

2 solutions

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Richard Deeming · Accepted Answer · 2015-03-17T04:40:00

Solution 2

A VB6 dll is going to be a 32-bit file. You need to configure your AppPool to run as a 32-bit process.

In IIS, under "Application Pools", select the application pool that your application is using. Right-click and select "Advanced Settings", and make sure that the "Enable 32-bit Applications" property is set to "True".

Posted 17-Mar-15 4:40am

Richard Deeming

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Maciej Los 17-Mar-15 15:33pm

Good suggestion!

Maciej Los · Accepted Answer · 2015-03-17T03:59:00

Solution 1

Strictly saying you can't use vb6 dll in your ASP.NET project unless it's COM dll.

See:
ASP.NET using VB6 code[^]
Calling COM Components from .NET Clients[^]
Comparing ASP.NET 2.0 and Visual Basic 6 WebClasses[^]

Posted 17-Mar-15 3:59am

Maciej Los

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anbucode01 18-Mar-15 1:35am

as per your reference i made the dll to COM type, now i get the error like this
Retrieving the COM class factory for component with CLSID {85CCBE9A-6200-4D2A-8D5A-2E595F2C144B} failed due to the following error: 8007007e The specified module could not be found. (Exception from HRESULT: 0x8007007E).

Maciej Los 18-Mar-15 2:39am

A dll must expose COM. If it does not expose COM, it's impossible to use it. If you're the owner of dll code, i suggest you to re-write dll using .NET language.
The error message says that your dll (probably) does not expose COM. See: this thread.

How to use VB6 dl in ASP.net application.

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How to use VB6 dl in ASP.net application.

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