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:\Users\srobertson\Documents\Visual Studio 2005\Projects\DefaultAudioDeviceCPP\Debug\DefaultAudioDeviceCPP.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.