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com dll vc6 to vc7: Can we ignore these warnings

Hi
Its a conversion of VC6 com dll into .NET 2003. just want to know how severe are the following warnings.

LINK : warning LNK4222: exported symbol 'DllCanUnloadNow' should not be assigned an ordinal
LINK : warning LNK4222: exported symbol 'DllGetClassObject' should not be assigned an ordinal
LINK : warning LNK4222: exported symbol 'DllRegisterServer' should not be assigned an ordinal
LINK : warning LNK4222: exported symbol 'DllUnregisterServer' should not be assigned an ordinal

LINK : warning LNK4089: all references to 'SHELL32.dll' discarded by /OPT:REF
LINK : warning LNK4089: all references to 'USER32.dll' discarded by /OPT:REF

Will ignoring the above cause any runtime problems?

Regards,
Shinto

Santino_k

No,I don't think so. According to MSDN Remove ordinal numbers as these functions are always located by name, using GetProcAddress.

Refer the following link.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcerrLinkerToolsWarningLNK4222.asp

Hope this helps

yuvarani

ASKER

Hi Santino,

      Thank you for your comments on LNK4222. Just a few more queries before closing this:
      1) I got these warning in VC7. Why these warning do not seen in VC6? Is Ordinal numbers are mandatory in VC6 ?
      2) Is there any scenario where using ordinal numbers are advantageous?
      3) There's another warning also in my initial post: "LINK : warning LNK4089: all references to 'SHELL32.dll' discarded by /OPT:REF"

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Santino_k

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Santino_k

To add to what i said above -
Every COM DLL requires following functions to be exported -
'DllCanUnloadNow'
'DllGetClassObject'
'DllRegisterServer'
'DllUnregisterServer'

Thus ordinal positions for these functions are ignored in VC7

yuvarani

ASKER

hi Santino,
Thanks for your info.