C++判斷操作系統是32位還是64位

BOOL Is64Bit_OS()
{
	BOOL bRetVal = FALSE;
	SYSTEM_INFO si = { 0 };
	LPFN_PGNSI pGNSI = (LPFN_PGNSI) GetProcAddress(GetModuleHandle(_T("kernel32.dll")), "GetNativeSystemInfo");
	if (pGNSI == NULL)
	{
		return FALSE;
	}
	pGNSI(&si);
	if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 || 
	si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64 )
	{
		bRetVal = TRUE;
	}
	else
	{
		 //32 位操作系統
		_tprintf(_T("is 32 bit OS\r\n"));
	}
	return bRetVal;
}