常用转换函数

一、Unicode和UTF8互相转化

 // 转换接收到的字符串
        public string UTF8ToUnicode(string recvStr)
        {
            byte[] tempStr = Encoding.UTF8.GetBytes(recvStr);
            byte[] tempDef = Encoding.Convert(Encoding.UTF8, Encoding.Default, tempStr);
            string msgBody = Encoding.Default.GetString(tempDef);
            return msgBody;
        }
        // 转换要发送的字符数组
        public byte[] UnicodeToUTF8(string sendStr)
        {
            byte[] msgBody = Encoding.UTF8.GetBytes(sendStr);
            return msgBody;
        }

二、其他类型互相转化

 private DateTime LongToDateTime(uint times)
        {
            long _times =(long)times + 28800;
            DateTime ds = new DateTime(1970, 1, 1, 0, 0, 0,DateTimeKind.Unspecified).AddSeconds(_times);
            return ds;
        }

        private byte [] StructToBytes(Object structobj , int size)
        {
            byte []tempBytes = new byte [size];
            IntPtr strcutIntptr = Marshal.AllocHGlobal(size);
            //将结构体拷贝到内存中
            Marshal.StructureToPtr(structobj, strcutIntptr, false);
            //从内存空间拷贝到byte数组中
            Marshal.Copy(strcutIntptr, tempBytes, 0, size);
            Marshal.FreeHGlobal(strcutIntptr);
            return tempBytes;

        }

        private object BytesToStruct(byte[] bytes ,Type _type)
        {
            int _size = Marshal.SizeOf(_type);
            IntPtr structInnptr = Marshal.AllocHGlobal(_size);
            Marshal.Copy(bytes, 0, structInnptr, _size);
            object obj = Marshal.PtrToStructure(structInnptr, _type);
            Marshal.FreeHGlobal(structInnptr);
            return obj;
        }

        private byte [] IntptrToBytes (IntPtr tempIntptr ,int _size)
        {
            byte[] tempBytes = new byte[_size];
            //从内存空间拷贝到byte数组中
            Marshal.Copy(tempIntptr, tempBytes, 0, _size);
            return tempBytes;
        }

        private IntPtr BytesToInptr(byte[] bytes, Type _type)
        {
            int _size = Marshal.SizeOf(_type);
            IntPtr structInnptr = Marshal.AllocHGlobal(_size);
            Marshal.Copy(bytes, 0, structInnptr, _size);
            return structInnptr;
        }