OLE Problem - An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object

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OLE Problem - An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object

Hello,

       I am working with COM interoperability. i.e, i am trying to access objects exported from unmaged code, from C# . But i am getting a Run-time error as

"Specified OLE variant is Invalid"

i go through many web-sites and forums. i failed to get my luck. Finally, i decided to post in microsoft forums, as this is belongs to microsoft product. Please help to solve this problem. Thanks in advance.

Regards,

Shaji Kumar.V.K




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OLE Problem - An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object

  • Michelle A.

    Hello Ernst Kuschke,

        I got the solution. However, thanks a lot on your response.

    Regards,

    Shaji



  • mrayyan

    What is it you export Could you perhaps show us some code

    It seems as if the unmanaged code you're calling is not getting a parameter of the type it expects.



  • Asaf W

    Hi Everyone,

    I was trying to get a SafeArray from C#, which is exported by unmanaged C++ COM object. But I 've got MDA message “An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object”. Could you please give me some hints Shaji, how did you solve your problem

    Thanks,

    Ponytar
  • OLE Problem - An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object
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