How to fix a linker error with PKEY_Device_FriendlyName

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

Code:

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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

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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.

PKEY_Device_FriendlyName
Is your OS at least Vista?

> Project->Properties...->Configuration Properties->C/C++->General->Additional Include Directories
But there is also
- additional library search directories
- additional libraries.


> EDIT: One thing of interest is that the errors are mentioning: _PKEY_Device_FriendlyName,
A leading underscore is typically added by the compiler when it generates the code.