Using C#, how to get whether my machine is 64bit or 32bit?

Question

Using C#, I would like to create a method that retunrs whether my machine is 64 or 32-bit.

Is there anybody who knows how to do that?

Answer 1

I have this coded for one of my projects (C# VS 2005).

//DLL Imports
using System.Runtime.InteropServices;            

            /// 

            /// The function determines whether the current operating system is a 
            /// 64-bit operating system.
            /// 
            /// 
            /// The function returns true if the operating system is 64-bit; 
            /// otherwise, it returns false.
            /// 
            public static bool Is64BitOperatingSystem()
            {
                if (IntPtr.Size == 8)  // 64-bit programs run only on Win64
                {
                    return true;
                }
                else  // 32-bit programs run on both 32-bit and 64-bit Windows
                {
                    // Detect whether the current process is a 32-bit process 
                    // running on a 64-bit system.
                    bool flag;
                    return ((DoesWin32MethodExist("kernel32.dll", "IsWow64Process") &&
                        IsWow64Process(GetCurrentProcess(), out flag)) && flag);
                }
            }



    /// 

    /// The function determins whether a method exists in the export 
    /// table of a certain module.
    /// 
    /// The name of the module
    /// The name of the method
    /// 
    /// The function returns true if the method specified by methodName 
    /// exists in the export table of the module specified by moduleName.
    /// 
    static bool DoesWin32MethodExist(string moduleName, string methodName)
    {
        IntPtr moduleHandle = GetModuleHandle(moduleName);
        if (moduleHandle == IntPtr.Zero)
        {
            return false;
        }
        return (GetProcAddress(moduleHandle, methodName) != IntPtr.Zero);
    }

    [DllImport("kernel32.dll")]
    static extern IntPtr GetCurrentProcess();

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr GetModuleHandle(string moduleName);

    [DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)]
    static extern IntPtr GetProcAddress(IntPtr hModule,
        [MarshalAs(UnmanagedType.LPStr)]string procName);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool IsWow64Process(IntPtr hProcess, out bool wow64Process);