StringPtr.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
 
namespace be.gaudry.bibliobrol.model.eid
{
    public struct StringPtr : IDisposable
    {
        private IntPtr data;
        public StringPtr(string data)
        {
            // allocate
            this.data = (data == null) ? IntPtr.Zero :
                Memory.StringToHLocalUni(data);
        }
        public override string ToString()
        {
            // return 
            return Marshal.PtrToStringUni(this.data);
        }
        public void Free()
        {
            // free
            Memory.FreeHLocal(this.data);
        }
        public static StringPtr Zero
        {
            get
            {
                // return empty version
                return new StringPtr(null);
            }
        }
        public static bool operator ==(StringPtr v1, StringPtr v2)
        {
            // check
            return v1.Equals(v2);
        }
        public static bool operator !=(StringPtr v1, StringPtr v2)
        {
            // check
            return !v1.Equals(v2);
        }
        public override bool Equals(object obj)
        {
            // check if it is an instance
            return ((obj is StringPtr) && ((StringPtr)obj).data.Equals(this.data));
        }
        public override int GetHashCode()
        {
            // return hash code of data block
            return data.GetHashCode();
        }
        public static void Free(StringPtr ptr)
        {
            // check if zero
            if (StringPtr.Zero != ptr)
            {
                // free it
                ptr.Free();
            }
        }
        public void Dispose()
        {
            // free 
            Free();
        }
    }
}