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VC6.0 compiler error C2664 while using GUID Vaclav_9-Dec-12 5:44 Vaclav_ 9-Dec-12 5:44  I am in over my head again. I am getting error C2664 and I did read the Tech note ( something about ANSI improvement) about it and frankly I just do not understand what is the problem and <b>how to fix it in VC6.0.</b> Do I have to redefine the GUID_DEVCLASS_COMPUTER? The parameter GUID is defined in both functions as “const GUID*” The API fails with this error C2664 and C_GetClassImgIndex compiles OK error C2664: 'SetupDiGetClassImageIndex' : cannot convert parameter 2 from 'const struct _GUID *' to 'struct _GUID *' Conversion loses qualifiers Fails b = SetupDiGetClassImageIndex(&m_imgList, &GUID_DEVCLASS_COMPUTER, &nRootImg); OK int n = C_GetClassImgIndex(&GUID_DEVCLASS_COMPUTER); Any help would be greatly appreciated. Cheers Vaclav Re: VC6.0 compiler error C2664 while using GUID Richard MacCutchan9-Dec-12 6:02 Richard MacCutchan 9-Dec-12 6:02  Vaclav_Sal wrote: The API fails with this error C2664 You are not using the API, this is a compiler error. Vaclav_Sal wrote: cannot convert parameter 2 from 'const struct _GUID *' to 'struct _GUID *' You are passing a const parameter to a function that does not expect one. Use const_cast[^] to remove it. But be sure you understand the potential consequences. One of these days I'm going to think of a really clever signature. Re: VC6.0 compiler error C2664 while using GUID Vaclav_9-Dec-12 7:14 Vaclav_ 9-Dec-12 7:14  Richard , I do not follow your explanation. In this MSDN doc the second parameter is defined as const GUID*. Am I using wrong version ot the Setupapi.h? PS Did you read the title? I did say compiler error.I do appreciate your help, but growing little tired of your sideline remarks,that's all. http://msdn.microsoft.com/en-us/library/windows/hardware/ff551074(v=vs.85).aspx BOOL SetupDiGetClassImageIndex( _In_   PSP_CLASSIMAGELIST_DATA ClassImageListData, _In_   const GUID *ClassGuid, _Out_  PINT ImageIndex ); Re: VC6.0 compiler error C2664 while using GUID jschell9-Dec-12 8:16 jschell 9-Dec-12 8:16  Vaclav_Sal wrote: _In_   const GUID *ClassGuid, The pointer is a constant, not the structure. Re: VC6.0 compiler error C2664 while using GUID PecuniousPete10-Dec-12 8:00 PecuniousPete 10-Dec-12 8:00  Oh come on man, it is the C language. If the compiler bitches just cast it out. YOU are in control. YO are the master! Re: VC6.0 compiler error C2664 while using GUID Arild Fiskum19-Dec-12 10:18 Arild Fiskum 19-Dec-12 10:18  Have you tried something like this: GUID tmp(GUID_DEVCLASS_COMPUTER); b = SetupDiGetClassImageIndex(&m_imgList, &tmp, &nRootImg);

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