我已經搜索了一天中最好的部分,試圖弄清楚這一點,我確定我錯過了某個簡單的解決方案。異步客戶端與表單交互
我正在使用異步套接字客戶端連接來監視來自TCP連接的傳入數據。我已經按照msdn示例的建議實施了ManualResetEvent和Callback方法,但Callback方法無法調用用於將接收到的數據輸出到Windows窗體的方法。如何從套接字接收數據並將其發送到表單中的文本框?
我確定有一個簡單的伎倆,我錯過了某個地方。示例代碼是爲控制檯應用程序編寫的。我如何使表單對來自Socket的傳入數據做出反應?
更新:
我覺得你讓我走上正軌。我試着使用代碼來使用代碼,但我顯然不太瞭解代表的工作方式,因爲它一直拋出以下錯誤:
非靜態字段,方法或屬性' APRS_SMS_Gateway.MainForm.SockOutputDelegate'
你能讓我靠近嗎?這是ConnectCallBack處理程序,我現在正在嘗試工作,但我想使用所有CallBack中的同一個方法(SockOutput)。
public partial class MainForm : Form
{
private AutoResetEvent receiveNow;
public delegate void SockOutputDelegatetype(string text); // Define delegate type
public SockOutputDelegatetype SockOutputDelegate;
// The port number for the remote device.
private const int port = 14580;
// ManualResetEvent instances signal completion.
private static ManualResetEvent connectDone =
new ManualResetEvent(false);
private static ManualResetEvent sendDone =
new ManualResetEvent(false);
private static ManualResetEvent receiveDone =
new ManualResetEvent(false);
// The response from the remote device.
private static String response = String.Empty;
public MainForm()
{
InitializeComponent();
SockOutputDelegate = new SockOutputDelegatetype(SockOutput);
}
private void Form1_Load(object sender, EventArgs e)
{
CommSetting.APRSServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//StartClient();
}
private void StartClient()
{
try
{
IPHostEntry ipHostInfo = Dns.GetHostEntry("rotate.aprs.net");
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
//Socket APRSServer = new Socket(AddressFamily.InterNetwork,
// SocketType.Stream, ProtocolType.Tcp);
// Connect to the remote endpoint.
CommSetting.APRSServer.BeginConnect(remoteEP,
new AsyncCallback(ConnectCallback), CommSetting.APRSServer);
connectDone.WaitOne();
//Show the connect string from the host
Receive(CommSetting.APRSServer);
//receiveDone.WaitOne();
//Show the connection response
//SockOutput(response);
}
catch (Exception e)
{
SockOutput(e.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket APRSServer = (Socket)ar.AsyncState;
// Complete the connection.
APRSServer.EndConnect(ar);
// Signal that the connection has been made.
connectDone.Set();
}
catch (Exception e)
{
MainForm.Invoke(MainForm.SockOutputDelegate, e.ToString());
}
}
private static void Receive(Socket client)
{
try
{
// Create the state object.
StateObject state = new StateObject();
state.workSocket = client;
// Begin receiving the data from the remote device.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
catch (Exception e)
{
//throw new ApplicationException(e.ToString());
response = e.ToString();
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
// Retrieve the state object and the client socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.workSocket;
// Read data from the remote device.
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// Get the rest of the data.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
else
{
// All the data has arrived; put it in response.
if (state.sb.Length > 1)
{
response = state.sb.ToString();
}
// Signal that all bytes have been received.
receiveDone.Set();
}
}
catch (Exception e)
{
response = e.ToString();
}
}
void SockOutput(string text)
{
txtSockLog.AppendText(text);
txtSockLog.AppendText("\r\n");
}
}
}
由於您的委託需要聲明爲靜態,即靜態void SockOutput(string text),您將得到異常。 – MarcF 2013-03-21 10:44:15
@ user2192887嘗試刪除'static'並嘗試。 – 2013-03-21 11:11:16
@MarcF我嘗試修改代碼來聲明委託爲靜態的,但這並沒有幫助。 – 2013-03-21 14:17:16