Error C2065: "CString": Undeclared identifier, c2065cstring

Error C2065: "CString": Undeclared identifier, c2065cstring

Compile the article:
When you use the GetAdaptersAddresses function to obtain the code in a physical MAC address, the following error occurs:
Error 3 error C2065: "CString": Undeclared identifier f: \ ccprojects \ obtain Nic physical address mac address \ temporary. h 13 1 obtain the NIC physical address MAC address

Environment: Windows 7 + VS2010

Solution:
Add header file:

# Include <afx. h>

Project Properties, configuration properties, General, and use of MFC in a static library