/// <summary>
/// 从数组的指定索引，读取一个块的说明书
/// </summary>
/// <param name="array"></param>
/// <param name="startIndex"></param>
/// <returns></returns>
public static BlockInformation ReadBlockInformation(this Byte[] array, int startIndex = 0)
{
int number = BitConverter.ToInt32(array, startIndex);
BlockInformation blockInformation = new BlockInformation();
blockInformation.blockKind = (BlockKind)(number % 10);
if (blockInformation.blockKind == BlockKind.Start)
{
blockInformation.LengthOfValue = 0;
blockInformation.functionKind = (FunctionKind)(number / 10);
}
else
{
blockInformation.LengthOfValue = number / 10;
}
return(blockInformation);
}
/// <summary>
/// 发送一个信息请求，一次性返回服务器回复内容
/// 内容均为UTF-8编码
/// </summary>
/// <param name="sender"></param>
/// <param name="functionKind">请求种类</param>
/// <param name="addition1">字符串1，不需要写入空串</param>
/// <param name="addition2">字符串2，不需要写入空串</param>
/// <param name="bitmap"></param>
/// <returns>服务器返回的结果</returns>
public static FunctionWords SendNewsAndReceiveAnswer(this object sender, FunctionKind functionKind = FunctionKind.none, string addition1 = "", string addition2 = "", Bitmap bitmap = null)
{
//连接服务器
IPAddress iPAddress = IPAddress.Parse(serverIp);
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
clientSocket.Connect(new IPEndPoint(iPAddress, serverPort));//连接服务器
}
catch (Exception ex)
{
MessageBox.Show("临时请求发送失败,异常信息:\n" + ex.Message);
clientSocket.Close();
return(null);
}
//确认发送消息内容
byte[] requestMessage = null;
switch (functionKind)
{
case FunctionKind.SeekForImage: //开始+账号+结尾
if (!addition1.EndsWith(".com"))
{
Console.WriteLine("发送信息格式错误:1");
clientSocket.Close();
return(null);
}
requestMessage = MessageProtocol.AddBytes(MessageProtocol.GetStartBytes(functionKind), MessageProtocol.GetTxtBytes(addition1), MessageProtocol.GetEndBytes());
break;
case FunctionKind.VerifyAccount: //开始+账户+密码+结尾
if (!addition1.EndsWith(".com") || addition2 == "")
{
Console.WriteLine("发送信息格式错误:2");
clientSocket.Close();
return(null);
}
requestMessage = MessageProtocol.AddBytes(MessageProtocol.GetStartBytes(functionKind), MessageProtocol.GetTxtBytes(addition1), MessageProtocol.GetTxtBytes(addition2), MessageProtocol.GetEndBytes());
break;
case FunctionKind.SeekForUserName: //开始+账号+结尾
requestMessage = MessageProtocol.AddBytes(MessageProtocol.GetStartBytes(functionKind), MessageProtocol.GetTxtBytes(addition1), MessageProtocol.GetEndBytes());
break;
case FunctionKind.SeekForNewGroupAccount: //开始+结尾
requestMessage = MessageProtocol.AddBytes(MessageProtocol.GetStartBytes(functionKind), MessageProtocol.GetEndBytes());
break;
case FunctionKind.QueryMemberOfGroup: //开始+群号+结尾
if (addition1.EndsWith(".com"))
{
Console.WriteLine("发送信息格式错误:4");
clientSocket.Close();
return(null);
}
requestMessage = MessageProtocol.AddBytes(MessageProtocol.GetStartBytes(functionKind), MessageProtocol.GetTxtBytes(addition1), MessageProtocol.GetEndBytes());
break;
default:
Console.WriteLine("发送信息格式错误:5");
clientSocket.Close();
return(null);
}
//确定发送消息不为空
if (requestMessage == null)
{
Console.WriteLine("发送信息格式错误:6");
clientSocket.Close();
return(null);
}
//发送请求
clientSocket.Send(requestMessage, requestMessage.Length, SocketFlags.None);
//开始接收返回值
Byte[] realDataReceived = new Byte[0];
FunctionWords functionWords = new FunctionWords();
try
{
//开始读取，遇到结束标识跳出
while (true)
{
//确保头部四字节数据完整
while (realDataReceived.Length < 4)
{
Byte[] RecvArray = new Byte[bufferSize]; //用于存放接收信息
int dataLengthInFact = clientSocket.Receive(RecvArray); //接收信息
if (dataLengthInFact <= 0) //服务器主动断开连接
{
errorTimes++;
if (errorTimes > 3)
{
MessageBox.Show("远程服务器主动退出,立即中断操作。错误:7");
return(null);
}
}
else
{
errorTimes = 0;
}
realDataReceived = MessageProtocol.AddBytes(realDataReceived, RecvArray.Take(dataLengthInFact).ToArray());
}
BlockInformation blockInformation = realDataReceived.ReadBlockInformation(0);
//确保尾部数据完整
while (realDataReceived.Length < blockInformation.lengthOfAll)
{
Byte[] RecvArray = new Byte[bufferSize]; //用于存放接收信息
int dataLengthInFact = clientSocket.Receive(RecvArray); //接收信息
realDataReceived = MessageProtocol.AddBytes(realDataReceived, RecvArray.Take(dataLengthInFact).ToArray());
}
switch (blockInformation.blockKind)
{
case BlockKind.Start:
functionWords.functionKind = blockInformation.functionKind;
break;
case BlockKind.Txt: //读取字符串
functionWords.stringList.Add(realDataReceived.ToTxt(4, blockInformation.LengthOfValue));
break;
case BlockKind.Image:
functionWords.bitmapList.Add(realDataReceived.ToBitmap(4, blockInformation.LengthOfValue));
break;
case BlockKind.File: //预留接口
Console.WriteLine("功能尚未开放，错误:7");
clientSocket.Close();
return(null);
case BlockKind.End: //读取到块结尾，说明一个功能语句读取完毕
goto EndBlock;
}
realDataReceived = realDataReceived.Skip(blockInformation.lengthOfAll).ToArray(); //去除字节数组中已经读过的部分
}
EndBlock :;
}
catch (Exception ex)
{
Console.WriteLine("连接错误，异常信息:8" + ex.Message);
return(null);
}
if (functionKind != functionWords.functionKind)
{
Console.WriteLine("服务器返回了错误的答复:9");
clientSocket.Close();
return(null);
}
return(functionWords);
}