private void AsyncRecvMsg(IAsyncResult ar)
{
RecvMsgEventArgs args = (RecvMsgEventArgs)ar.AsyncState;
args.RecvBytes.Clear();
args.Message = "";
try {
if (_clientStream.CanRead)
{
// CanRead为false，说明m_clientStream流不可读，可能是m_clientStream流已关闭或发生错误，退出本次读取处理
// 为true，则说明m_clientStream流可读，可继续执行后续代码
int bytesRead = _clientStream.EndRead(ar);
// 读取缓冲区大小为256字节，用于OBD诊断命令已足够，无需使用NetworkStream.DataAvailable属性
// 来判断是否还有数据没有读取完，需要分段多次读取
for (int i = 0; i < bytesRead; i++)
{
args.RecvBytes.Add(_recvBuf[i]);
}
args.Message += Encoding.UTF8.GetString(_recvBuf, 0, bytesRead);
// 继续准备读取可能会传进来的数据
_clientStream.BeginRead(_recvBuf, 0, BUF_SIZE, AsyncRecvMsg, args);
}
} catch (Exception ex) {
_log.TraceError(ex.Message);
Close();
} finally {
RecvedMsg?.Invoke(this, args);
}
}
private void OnRecvedMsg(object sender, RecvMsgEventArgs e)
{
foreach (byte item in e.RecvBytes)
{
OnRxChar(item);
}
}
public void ConnectServer()
{
try {
_client = new TcpClient(_strHostName, _iPort);
_clientStream = _client.GetStream();
_recvBuf = new byte[BUF_SIZE];
RecvMsgEventArgs args = new RecvMsgEventArgs();
_clientStream.BeginRead(_recvBuf, 0, BUF_SIZE, AsyncRecvMsg, args);
} catch (Exception) {
Close();
throw;
}
}
