C# api 得到机器名

 

[DllImport("kernel32.dll",
EntryPoint = "GetComputerName",
ExactSpelling = false,
SetLastError = true)]
        static extern bool GetComputerName(
        [MarshalAs(UnmanagedType.LPArray)] byte[] lpBuffer,
        [MarshalAs(UnmanagedType.LPArray)] Int32[] nSize);  

        public Form1()
        {
            InitializeComponent();

            byte[] str = new byte[20];
            Int32[] len = new Int32[1];
            len[0] = 20;
            GetComputerName(str, len);
            MessageBox.Show(System.Text.Encoding.ASCII.GetString(str));  



}