获取操作系统是32还是64位

// 安全的取得真实系统信息
VOID SafeGetNativeSystemInfo(__out LPSYSTEM_INFO lpSystemInfo)
{
if (NULL==lpSystemInfo)    return;
typedef VOID (WINAPI *LPFN_GetNativeSystemInfo)(LPSYSTEM_INFO lpSystemInfo);
LPFN_GetNativeSystemInfo fnGetNativeSystemInfo = (LPFN_GetNativeSystemInfo)GetProcAddress( GetModuleHandle(_T("kernel32")), "GetNativeSystemInfo");;
if (NULL != fnGetNativeSystemInfo)
{
fnGetNativeSystemInfo(lpSystemInfo);
}
else
{
GetSystemInfo(lpSystemInfo);
}
}


// 获取操作系统位数
int GetSystemBits()
{
SYSTEM_INFO si;
SafeGetNativeSystemInfo(&si);
if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ||
si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_IA64 )
{
return 64;
}
return 32;
}