好类 笔记 武胜

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace CalmBeltFund.Trading.CTPStock
{
  internal class PInvokeUtility
  {
    static Encoding encodingGB2312 = Encoding.GetEncoding(936);

    public static string GetUnicodeString(byte[] str)
    {

      if (str == null)
      {
        return "";
      }

      byte[] unicodeStr = Encoding.Convert(encodingGB2312, Encoding.Unicode, str);

      return Encoding.Unicode.GetString(unicodeStr).TrimEnd('\0');
    }

    public static T GetObjectFromIntPtr<T>(IntPtr handler)
    {
      try
      {
        if (handler == IntPtr.Zero)
        {
          return default(T);
        }
        else
        {
          return (T)Marshal.PtrToStructure(handler, typeof(T));
        }
      }
      catch (Exception ex)
      {
        throw ex;
      }
    }

    public static object GetObjectFromIntPtr(Type t,IntPtr handler)
    {
      try
      {
        if (handler == IntPtr.Zero)
        {
          return null;
        }
        else
        {
          return Marshal.PtrToStructure(handler, t);
        }
      }
      catch (Exception ex)
      {
        throw ex;
      }
    }
  }
}