//ar是IAsyncResult类型的接口，表示异步操作的状态
//是由lister.beginaccepttcpclient(callback,listner)传递过来的
private void AcceptTcpClientCallback(IAsyncResult ar)
{
if (isExit == false)
{
try
{
//将事件状态设为终止状态，允许一个或多个等待链接线程继续
allDone.Set();
TcpListener myListener = (TcpListener)ar.AsyncState;
//异步接收传入的连接，并创建新的TCPclient对象处理远程主机通信
TcpClient client = myListener.EndAcceptTcpClient(ar);
listBox_Status.Invoke(setListBoxCallback, "已接受客户连接：" + client.Client.RemoteEndPoint);
comboBox1.Invoke(setComboBoxCallback, client.Client.RemoteEndPoint.ToString());
ReadWriteObject readWriteObject = new ReadWriteObject(client);
clientList.Add(readWriteObject);
SendString(readWriteObject, "服务器已经接收连接，请通话！");
readWriteObject.netStream.BeginRead(readWriteObject.readByte, 0, readWriteObject.readByte.Length, ReadCallback, readWriteObject);
}
catch (System.Exception ex)
{
listBox_Status.Invoke(setListBoxCallback, ex.Message);
return;
}
}
}
private void SendCallback(IAsyncResult ar)
{
ReadWriteObject readWriteObject = (ReadWriteObject)ar.AsyncState;
try
{
readWriteObject.netStream.EndWrite(ar);
}
catch (Exception err)
{
listBoxStatus.Invoke(setListBoxCallback, err.Message);
comboBox1.Invoke(removeComboBoxItemsCallback, readWriteObject);
}
}
private void SendString(ReadWriteObject readWriteObject, string str)
{
try
{
readWriteObject.writeBytes = Encoding.UTF8.GetBytes(str + "\r\n");
readWriteObject.netStream.BeginWrite(readWriteObject.writeBytes, 0, readWriteObject.writeBytes.Length, new AsyncCallback(SendCallback), readWriteObject);
readWriteObject.netStream.Flush();
listBoxStatus.Invoke(setListBoxCallback, string.Format("向{0}发送：{1}", readWriteObject.client.Client.RemoteEndPoint, str));
}
catch (Exception err)
{
listBoxStatus.Invoke(setListBoxCallback, err.Message);
}
}
private void SendCallback(IAsyncResult ar)
{
ReadWriteObject readWriteObject = (ReadWriteObject)ar.AsyncState;
try
{
readWriteObject.netStream.EndWrite(ar);
}
catch (System.Exception ex)
{
listBox_Status.Invoke(setListBoxCallback, ex.Message);
comboBox1.Invoke(removeComboBoxItemsCallback, readWriteObject);//如果发送出现异常，就把ComboBox中指定的项删掉
}
}
//【发送】按钮Click事件
private void buttonSend_Click(object sender, EventArgs e)
{
int index = comboBox1.SelectedIndex;
if (index == -1)
{
MessageBox.Show("请先选择接受方，然后再点击[发送]");
}
else
{
ReadWriteObject obj = (ReadWriteObject)clientList[index];
SendString(obj, richTextBoxSend.Text);
richTextBoxSend.Clear();
}
}
private void SendString(ReadWriteObject readWriteObject, string str)
{
try
{
readWriteObject.writeByte = System.Text.Encoding.Unicode.GetBytes(str + "\r\n");
readWriteObject.netStream.BeginWrite(readWriteObject.writeByte, 0, readWriteObject.writeByte.Length, new AsyncCallback(SendCallback), readWriteObject);//这里的callback委托为什么要新建一个对象呢？而不直接使用SENDCALLback？
readWriteObject.netStream.Flush();
listBox_Status.Invoke(setListBoxCallback, string.Format("向{0}发送：{1}", readWriteObject.client.Client.RemoteEndPoint, str));
}
catch (System.Exception ex)
{
listBox_Status.Invoke(setListBoxCallback, ex.Message);
}
}
private void ReadCallback(IAsyncResult ar)
{
try
{
ReadWriteObject readWriteObject = (ReadWriteObject)ar.AsyncState;
int count = readWriteObject.netStream.EndRead(ar);
richTextBoxReceive.Invoke(setRichTextBoxCallback, string.Format("[来自{0}]{1}", readWriteObject.client.Client.RemoteEndPoint, System.Text.Encoding.UTF8.GetString(readWriteObject.readBytes, 0, count)));
if (isExit == false)
{
readWriteObject.InitReadArray();
readWriteObject.netStream.BeginRead(readWriteObject.readBytes, 0, readWriteObject.readBytes.Length, ReadCallback, readWriteObject);
}
}
catch (Exception err)
{
listBoxStatus.Invoke(setListBoxCallback, err.Message);
}
}
private void RemoveComboBoxItems(ReadWriteObject readWriteObject)
{
int index = clientList.IndexOf(readWriteObject);
comboBox1.Items.RemoveAt(index);
}