它引發索引並且計數必須引用緩衝區中的位置。當超過3個客戶端連接到服務器時,參數名稱字節異常&字節數據被聲明爲全局變量。索引和計數必須引用緩衝區內的位置。參數名稱字節
private void OnReceive(IAsyncResult ar)
{
try
{
clientSocket.EndReceive(ar);
Data msgReceived = new Data(byteData);
//Accordingly process the message received
switch (msgReceived.cmdCommand)
{
case Command.Login:
//lstChatters.Items.Add(msgReceived.strName);
break;
case Command.Logout:
lstChatters.Items.Remove(msgReceived.strName);
break;
case Command.Message:
break;
case Command.List:
lstChatters.Items.AddRange(msgReceived.strMessage.Split('*'));
lstChatters.Items.RemoveAt(lstChatters.Items.Count - 1);
txtChatBox.Text += "<<<" + strName + " has joined the room>>>\r\n";
break;
}
if (msgReceived.strMessage != null && msgReceived.cmdCommand != Command.List)
txtChatBox.Text += msgReceived.strMessage + "\r\n";
byteData = new byte[1024];
clientSocket.BeginReceive(byteData,
0,
byteData.Length,
SocketFlags.None,
new AsyncCallback(OnReceive),
null);
}
catch (ObjectDisposedException)
{ }
catch (Exception ex)
{
MessageBox.Show(ex.Message, "ClientTCP: " + strName, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
這是用於管理服務器和客戶端之間的數據通信類數據:
class Data
{
//Default constructor
public Data()
{
this.cmdCommand = Command.Null;
this.strMessage = null;
this.strName = null;
}
//Converts the bytes into an object of type Data
public Data(byte[] data)
{
//The first four bytes are for the Command
this.cmdCommand = (Command)BitConverter.ToInt32(data, 0);
//The next four store the length of the name
int nameLen = BitConverter.ToInt32(data, 4);
//The next four store the length of the message
int msgLen = BitConverter.ToInt32(data, 8);
//This check makes sure that strName has been passed in the array of bytes
if (nameLen > 0)
this.strName = Encoding.UTF8.GetString(data, 12, nameLen);
else
this.strName = null;
//This checks for a null message field
if (msgLen > 0)
this.strMessage = Encoding.UTF8.GetString(data, 12 + nameLen, msgLen);
else
this.strMessage = null;
}
//Converts the Data structure into an array of bytes
public byte[] ToByte()
{
List<byte> result = new List<byte>();
//First four are for the Command
result.AddRange(BitConverter.GetBytes((int)cmdCommand));
//Add the length of the name
if (strName != null)
result.AddRange(BitConverter.GetBytes(strName.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Length of the message
if (strMessage != null)
result.AddRange(BitConverter.GetBytes(strMessage.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Add the name
if (strName != null)
result.AddRange(Encoding.UTF8.GetBytes(strName));
//And, lastly we add the message text to our array of bytes
if (strMessage != null)
result.AddRange(Encoding.UTF8.GetBytes(strMessage));
return result.ToArray();
}
public string strName; //Name by which the client logs into the room
public string strMessage; //Message text
public Command cmdCommand; //Command type (login, logout, send message, etcetera)
}
使用堆棧跟蹤更好地發佈確切的異常。而且,這個byteData看起來不是全局的。 –
您可能發送的消息大於'byteData'(1024)的大小嗎? –
你正在做的一個糟糕的假設是,你調用BeginReceive(byteData,0,byteData.Length ...)將會用' byteData.Length'字節數據。請注意您的代碼當前忽略的['EndReceive'](http://msdn.microsoft.com/en-us/library/w7wtt64b)的返回值。 –