VC + + to determine whether the current system is 32-bit or 64-bit

Tried in VC + + environment to determine whether the system is 32-bit or 64-bit method, pro-Test effective! The functions provided are as follows
　　

BOOL IsWow64 () {     typedef bool (WINAPI *lpfn_iswow64process) (HANDLE, pbool);     Lpfn_iswow64process fniswow64process;     BOOL bIsWow64 = FALSE;     Fniswow64process = (lpfn_iswow64process) GetProcAddress (GetModuleHandle ("kernel32"), "iswow64process");     if (NULL! = fniswow64process)     {         fniswow64process (getcurrentprocess (), &biswow64);    }     

　

VC + + to determine whether the current system is 32-bit or 64-bit