In a .NET 2.0 C# application I use the following code to detect the operating system platform:
string os_platform = System.Environment.OSVersion.Platform.ToString();
This returns "Win32NT". The problem is that it returns "Win32NT" even when running on Windows Vista 64-bit.
Is there any other method to know the correct platform (32 or 64 bit)?
Note that it should also detect 64 bit when run as a 32 bit application on Windows 64 bit.
The full answer is this (taken from both stefan-mg, ripper234 and BobbyShaftoe's answer):
[DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool IsWow64Process([In] IntPtr hProcess, [Out] out bool lpSystemInfo);
private bool Is64Bit()
{
if (IntPtr.Size == 8 || (IntPtr.Size == 4 && Is32BitProcessOn64BitProcessor()))
{
return true;
}
else
{
return false;
}
}
private bool Is32BitProcessOn64BitProcessor()
{
bool retVal;
IsWow64Process(Process.GetCurrentProcess().Handle, out retVal);
return retVal;
}
First check if you're in a 64 bit process. If you're not, check if the 32 bit process is a Wow64Process.
I use a version of the following:
public static bool Is64BitSystem()
{
if (Directory.Exists(Environment.GetEnvironmentVariable("Program Files (x86)"))) return true;
else return false;
}