C++判断系统位数

BOOL Is64BitSystem()
{
    typedef void (WINAPI *PGNSI)(LPSYSTEM_INFO);
    PGNSI pGNSI;
    SYSTEM_INFO si;
    ZeroMemory(&si, sizeof(SYSTEM_INFO));
    pGNSI =(PGNSI) GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "GetNativeSystemInfo");
    if (pGNSI)
    {
        pGNSI(&si);

        if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ||
            si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64 ||
            si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM64)
        {
            return TRUE;
        }
    }
    return FALSE;
}