修改LumaQQ.NET，使其支持长消息发送

        默认LumaQQ.NET不支持发送长消息，只能文字量比较小的文字信息。其实在内部设计上，已经支持了分片发送的功能，只是没有去拆分实现。我们这就来自己实现它。

1.首先在QQGlobal里添加消息最长长度定义：

   1: /// <summary>

   2: /// 消息最大长度，QQ是最大699字节   LumaQQ里说最长是700，但是我试下来只能是699，700就会出错，不知道为什么

   3: /// </summary>

   4: public const int QQ_MAX_SEND_IM = 699;

2.修改MessageManager里其中2个SendIM的方法

   1: /// <summary>

   2: /// 发送普通信息

   3: ///  <remark>abu 2008-03-11 </remark>

   4: /// </summary>

   5: /// <param name="receiver">The receiver.</param>

   6: /// <param name="message">The message.</param>

   7: /// <param name="fontSytle">The font sytle.</param>

   8: public void SendIM(int receiver, string message, FontStyle fontSytle)

   9: {

  10:     int MaxByte = QQGlobal.QQ_MAX_SEND_IM;//取最长长度

  11:  

  12:  

  13:     if (Encoding.GetEncoding(QQGlobal.QQ_CHARSET_DEFAULT).GetBytes(message).Length > MaxByte)//判断是不是要分段发送

  14:     {

  15:         List<byte> messageBytes = new List<byte>();

  16:         messageBytes.AddRange(Utils.Util.GetBytes(message));

  17:         messageBytes.Add(0x20);//补一个空格，不补似乎也会出问题

  18:         int messageSize = messageBytes.Count;

  19:  

  20:         int totalFragments = ((messageSize % MaxByte) > 0) ? (messageSize / MaxByte + 1) : (messageSize / MaxByte);//计算分片数

  21:         for (int fragementSequence = 0; fragementSequence < totalFragments; fragementSequence++)

  22:         {

  23:             int index = fragementSequence * MaxByte;

  24:             int BytesSize = ((messageSize - index) > MaxByte) ? MaxByte : (messageSize - index);//不能每次都申请最大长度的byte数组，不然字体会出问题

  25:             byte[] messageFragementBytes = new byte[BytesSize];

  26:  

  27:  

  28:             messageBytes.CopyTo(index, messageFragementBytes, 0, BytesSize);

  29:             SendIM(receiver, messageFragementBytes, totalFragments, fragementSequence, fontSytle);

  30:  

  31:  

  32:         }

  33:     }

  34:     else

  35:     {

  36:         SendIM(receiver, Utils.Util.GetBytes(message), 1, 0, fontSytle);

  37:     }

  38: }

  39: /// <summary>

  40: /// 发送普通信息

  41: ///  <remark>abu 2008-03-11 </remark>

  42: /// </summary>

  43: /// <param name="receiver">The receiver.</param>

  44: /// <param name="message">The message.</param>

  45: /// <param name="totalFragments">The total fragments.总分块数</param>

  46: /// <param name="fragementSequence">The fragement sequence.当前当块序号</param>

  47: /// <param name="fontSytle">The font sytle.</param>

  48: public void SendIM(int receiver, byte[] message, int totalFragments,

  49:     int fragementSequence, FontStyle fontSytle)

  50: {

  51:     SendIMPacket packet = new SendIMPacket(QQUser);

  52:     packet.Receiver = receiver;

  53:     packet.Message = message;//Utils.Util.GetBytes(message);

  54:     packet.TotalFragments = totalFragments;

  55:     packet.FragmentSequence = fragementSequence;

  56:     packet.FontStyle = fontSytle;

  57:     QQClient.PacketManager.SendPacket(packet, QQPort.Main.Name);

  58: }