c++ - How to fix a linker error with PKEY_Device_FriendlyName

Question

Upon using PKEY_Device_FriendlyName, I'm getting the following errors:

Error   1   error LNK2001: unresolved external symbol _PKEY_Device_FriendlyName DefaultAudioDeviceCPP.obj   
Error   2   fatal error LNK1120: 1 unresolved externals C:UserssrobertsonDocumentsVisual Studio 2005ProjectsDefaultAudioDeviceCPPDebugDefaultAudioDeviceCPP.exe 

What's a very simple way to clear these errors? I'm including functiondiscovery.h and functiondiscoverykeys.h. Also the path in Project->Properties...->Configuration Properties->C/C++->General->Additional Include Directories is correct.

EDIT: One thing of interest is that the errors are mentioning: _PKEY_Device_FriendlyName, not PKEY_Device_FriendlyName. But I'm only using the latter in my program.

Answer 1

Old post, but hopefully this answer will save someone some time.

I was having the same problem with DEVPKEY properties - like DEVPKEY_Device_FriendlyName. I got a very similar link error. I stumbled upon the answer in comments here: Referencing GUIDs

Basically, add an #include before the include for things like devpkey.h where the property keys are defined.

So, at the top of my file I have:

#include <setupapi.h>  
#include <initguid.h>  // Put this in to get rid of linker errors.  
#include <devpkey.h>  // Property keys defined here are now defined inline.