判断操作系统是32位还是64位

1判断操作系统是32位还是64位

//方法I：
BOOL IsWow64()
{
	//函数IsWow64Process()用于确定指定进程是否运行在64位操作系统的32环境(Wow64)下
	//如果该进程是32位进程,运行在64操作系统,该值为true,否则为false,具体如下：
	//32bit程序跑在32bit系统下,返回0.
	//32bit程序跑在64bit系统下,是wow64模式,返回1.
	//64bit程序跑在64bit系统下,那么不是wow64模式,返回0
	BOOL bIsWow64 = FALSE;
	typedef BOOL(WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
	LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");
	if (NULL != fnIsWow64Process)
	{
		fnIsWow64Process(GetCurrentProcess(), &bIsWow64);
	}

	return bIsWow64;
}

//方法II：
BOOL Is64BitOS()
{
	typedef BOOL(WINAPI *LPFN_PGNSI) (LPSYSTEM_INFO);
	LPFN_PGNSI pGNSI = (LPFN_PGNSI)GetProcAddress(GetModuleHandle(_T("kernel32.dll")), "GetNativeSystemInfo");
	if (pGNSI == NULL)
	{
		return FALSE;
	}

	BOOL bRetVal = FALSE;
	SYSTEM_INFO si = { 0 };
	pGNSI(&si);
	if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 || si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64)
	{
		bRetVal = TRUE;
	}

	return bRetVal;
}