Hi Stanley,

You have to add a cpp file where these GUIDs will be defined, look at 
dlliids.cpp in client/core.

GUIDs are always linked at the final stage(dlls or executables) to avoid 
duplicate symbols.

David

stanley kao wrote:
> Hi All,
>
> I am confused about GUIDs.  I got the following errors
>
>
>
> libhxclient.lib(CHXClientEngine.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXClientEngine
> libhxclient.lib(CHXClientEngine.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXClientEngineSetup
> libhxclient.lib(CHXClientPlayer.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXGroupManager
> libhxclient.lib(CHXClientPlayer.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXRecordManager
> libhxclient.lib(CHXClientPlayer.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXClientRecordService
> libhxclient.lib(CHXClientPlayer.obj) : error LNK2001: unresolved external
> symbol
>  _IID_IHXCommonClassFactory
> libhxclient.lib(CHXClientDataStream.obj) : error LNK2001: unresolved
> external sy
> mbol _IID_IHXCommonClassFactory
> libhxclient.lib(CHXClientSite.obj) : error LNK2001: unresolved external
> symbol _
> IID_IHXCommonClassFactory
>
>
> It goes on and on but basically it cannot find any of the IID_IHX* symbols.
> These IID_IHX* symbols are defined in multiple helix headder files.
> For example in hxwin.h is the definition for IID_IHXSiteWatcher.  
>
> DEFINE_GUID(IID_IHXSiteWatcher, 0x00000D05, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 
> 			0xa0, 0x24, 0x40, 0x6d, 0x59); 
>
>
> So it seems like if libhxclient.lib includes hxwin.h then IID_IHXSiteWatcher
> shouldn't be an external symbol.   However in hxcom.h is the definition of
> the DEFINE_GUID macro.
>
> #if defined(HELIX_FEATURE_FULLGUID)
>
> #if !defined (INITGUID) || (defined (_STATICALLY_LINKED) &&
> !defined(NCIHACK))
>
> #define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
>     EXTERN_C const GUID FAR name
>
> #define DEFINE_GUID_ENUM(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
>     EXTERN_C const GUID FAR name;
>
> #else /*#if !defined (INITGUID) || (defined (_STATICALLY_LINKED) &&
> !defined(NCIHACK)) */
>
> #define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
>         EXTERN_C const GUID name \
>                 = { l, w1, w2, { b1, b2,  b3,  b4,  b5,  b6,  b7,  b8 } }
>
> #define DEFINE_GUID_ENUM(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
>         EXTERN_C const GUID name \
>                 = { l, w1, w2, { b1, b2,  b3,  b4,  b5,  b6,  b7,  b8 } };
>
> #endif  /*#if !defined (INITGUID) || (defined (_STATICALLY_LINKED) &&
> !defined(NCIHACK)) #else */
>
> #endif /* #if defined(HELIX_FEATURE_FULLGUID) */
>
>
> So if libhxclient.lib is built as a static library then IID_IHXSiteWatcher
> always become an extern.  So if it is an extern then where is the actual
> definition of IID_IHXSiteWatcher.  I can't find it anywhere.   This same
> thing applies to all of the IID_IHX* variables.  
>
>
> -stan 
>
>
>
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>
>