Com dll error on windows xp

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Hi I create vb.net application on windows 8,and in my application I used faxcomex.dll and faxcom.dll it works fine on windows 8,but when I copy debug file of project to windows xp and run it I get error about dlls,I do not know why they happen,can anyone help me?
thanks

Posted 6-Jan-14 19:54pm

Angela 10293848

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Bernhard Hiller · Answer 1 · 2014-01-06T20:46:00

Solution 1

"I get error about dll" - that's not a good way to ask for help: you get an error message, and you can copy it verbatim here.
I guess that there is a version issue: you developed on Windows 8, hence the dlls might have a newer version (and hence different Guids) than on Windows XP.
To circumvent that, you could develop on XP, or create some Primary Interop Assemblies (PIA) on XP and use them for development on Windows 8. Both ways assume that the newer dlls are backward-compatible at least to XP.

Posted 6-Jan-14 20:46pm

Bernhard Hiller

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Angela 10293848 7-Jan-14 2:51am

Thanks Bernhard
but faxcomex.dll and faxcom.dll ther are in both OS why that happen

Angela 10293848 7-Jan-14 7:19am

Iget this error:

error number D,unable to cast COM object of type 'FAXCOMEXLIB.Faxserverclass' to interface type FAXCOMEXLIB.IFaxServer2 this oparation failed because the quary interface call on the COM component for the interface with IID '{571CED0F-5609-4F40...}' failed due to the following error : no souch interface supported (Exception from HRESULT"0x80004002(E_NOINTERFACE))

Bernhard Hiller 7-Jan-14 9:32am

That's what I meant with version issue: you use functionality which is present in the Windows 8 version of the dll but not in the XP version. That the dlls have the same name, does not matter at all - the version (i.e. the contents) matters.