How do I find the name of an operating system? - c++

Question

The questions pretty simple. I want want a function (C++) or method which will, on call, returun something like
"Windows" //or
"Unix"
Nothing fancy, I dont need the version numbe or anything. Just the os name. A quick google searc didnt turn up anything useful, so I thought I'd post this here

Answer 1

Since you can not have a single binary file which runs over all operating systems, and you need to re-compile your code again. It's OK to use MACROs.
Use macros such as
_WIN32
_WIN64
__unix
__unix__
__APPLE__
__MACH__
__linux__
__FreeBSD__
like this
std::string getOsName()
{
#ifdef _WIN32
return "Windows 32-bit";
#elif _WIN64
return "Windows 64-bit";
#elif __APPLE__ || __MACH__
return "Mac OSX";
#elif __linux__
return "Linux";
#elif __FreeBSD__
return "FreeBSD";
#elif __unix || __unix__
return "Unix";
#else
return "Other";
#endif
}
You should read compiler's manuals and see what MACROS they provided to detect the OS on compile time.

Answer 2

From the Poco source code:
Win32:
std::string EnvironmentImpl::osNameImpl()
{
OSVERSIONINFO vi;
vi.dwOSVersionInfoSize = sizeof(vi);
if (GetVersionEx(&vi) == 0) throw SystemException("Cannot get OS version information");
switch (vi.dwPlatformId)
{
case VER_PLATFORM_WIN32s:
return "Windows 3.x";
case VER_PLATFORM_WIN32_WINDOWS:
return vi.dwMinorVersion == 0 ? "Windows 95" : "Windows 98";
case VER_PLATFORM_WIN32_NT:
return "Windows NT";
default:
return "Unknown";
}
}
Unix:
std::string EnvironmentImpl::osNameImpl()
{
struct utsname uts;
uname(&uts);
return uts.sysname;
}