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Asked: 2026-06-07T14:17:55+00:00

1) a 32bit dll is placed in C:\Windows\SysWOW64 2) Registered using regasm.exe 3) While

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1) a 32bit dll is placed in C:\Windows\SysWOW64

2) Registered using regasm.exe

3) While compiling, i set the target cpu to x86

I can add reference in my vb6 program but when i try to call the method within the dll, it failed. Error message as follow :

 "Runtime Error '-2147467261' object instance not set to an instance of an object"

Codes here :

Set m_objCLogon = CreateObject("CommonLogon.Logon")
strResult = m_objCLogon.ValidateLogin(p_strUserID, p_strEncryptedPwd, p_strAppID)

The code is pretty simple, just passing in the credentials for validation.

Anyone knows which part has gone wrong?

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1 Answer

  1. Editorial Team

    Clearly there’s nothing wrong with the registration, the error message is a .NET exception message. Your code is bombing on a NullReferenceException. That’s a very common exception and it is (nearly) always caused by a bug in your code.

    You’ll need to debug your code. Do so with Project + Properties, Debug tab. Select “Start external program” and set it to your vb6 program or c:\program files\microsoft visual studio\vb6\vb6.exe. Then Debug + Exceptions, tick the Thrown box for CLR exceptions. Press F5 to start.

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