[wdmaudiodev] Re: Need help on IID_IMiniport
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 2 May 2014 15:30:07 +0000
portcls.h has this line:
DEFINE_GUID(IID_IPowerNotify,
0x3DD648B8L, 0x969F, 0x11D1, 0x95, 0xA9, 0x00, 0xC0, 0x4F, 0xB9, 0x25, 0xD3);
DEFINE_GUID is defined in guiddef.h as follows:
#ifdef INITGUID
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
EXTERN_C const GUID DECLSPEC_SELECTANY name \
= { l, w1, w2, { b1, b2, b3, b4, b5, b6, b7, b8 } }
#else
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
EXTERN_C const GUID FAR name
#endif // INITGUID
INITGUID gets defined (or not) by #include <initguid.h> (or not.)
Since you want the GUID to be defined precisely once, you need to have
precisely one .cpp file in your project that looks like this:
…
#include <initguid.h>
…
#include <portcls.h>
…
As long you have precisely one such .cpp file, you can have as many .cpp files
you like that #include <portcls.h> without <initguid.h>.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Neetu Sand
Sent: Friday, May 2, 2014 5:29 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Need help on IID_IMiniport
Hi All,
I am trying to build a MIDI driver based on DDK sample. While building it is
complaining about :
"error LNK2001: unresolved external symbol _IID_IPowerNotify"
"error LNK2001: unresolved external symbol _IID_IMusicTechnology"
"error LNK2001: unresolved external symbol _IID_IMiniport"
These GUIDs are defined in PortCls.h. I am adding Portcls.lib and Stdunk.lib
for TARGET_LIBS but still I am getting these errors.
Any ideas on what am I doing wrong here?
cheers
Neetu
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