我有以下 .NET 代码。其中大部分是在我被聘用之前很久就写好的，而且没有一个最初的开发人员仍然为我们工作。
private void SendTCPMessage(string IpAddress, string Message)
{
...
//original code that fails because the Host entry produced
//has no elements in AddressList.
//IPHostEntry remoteMachineInfo = Dns.GetHostEntry(IpAddress);
//New code that fails when connecting
IPHostEntry remoteMachineInfo;
try
{
remoteMachineInfo = Dns.GetHostEntry(IpAddress);
if (remoteMachineInfo.AddressList.Length == 0)
remoteMachineInfo.AddressList =
new[]
{
new IPAddress(
//Parse the string into the byte array needed by the constructor;
//I double-checked that the correct address is produced
IpAddress.Split('.')
.Select(s => byte.Parse(s))
.ToArray())
};
}
catch (Exception)
{
//caught and displayed in a status textbox
throw new Exception(String.Format("Could not resolve or parse remote host {0} into valid IP address", IpAddress));
}
socketClient.Connect(remoteMachineInfo, 12345, ProtocolType.Tcp);
...
}
注意的SocketClient代码如下：
public void Connect(IPHostEntry serverHostEntry, int serverPort, ProtocolType socketProtocol)
{
//this line was causing the original error;
//now AddressList always has at least one element.
m_serverAddress = serverHostEntry.AddressList[0];
m_serverPort = serverPort;
m_socketProtocol = socketProtocol;
Connect();
}
...
public void Connect()
{
try
{
Disconnect();
SocketConnect();
}
catch (Exception exception) ...
}
...
private void SocketConnect()
{
try
{
if (SetupLocalSocket())
{
IPEndPoint serverEndpoint = new IPEndPoint(m_serverAddress, m_serverPort);
//This line is the new point of failure
socket.Connect(serverEndpoint);
...
}
else
{
throw new Exception("Could not connect!");
}
}
...
catch (SocketException se)
{
throw new Exception(se.Message);
}
...
}
...
private bool SetupLocalSocket()
{
bool return_value = false;
try
{
IPEndPoint myEndpoint = new IPEndPoint(m_localAddress, 0);
socket = new Socket(myEndpoint.Address.AddressFamily, SocketType.Stream, m_socketProtocol);
return_value = true;
}
catch (SocketException)
{
return_value = false;
}
catch (Exception)
{
return_value = false;
}
return return_value;
}
在 SocketConnect 中连接到端点时，我收到一个 SocketException 说明：
系统在尝试在调用中使用指针参数时检测到无效的指针地址。
网上的信息对如何解决这个问题有点轻描淡写。AFAICT，地址正在正确解析，并且一旦传入 SocketClient 类就会正确检索。老实说，我不知道这段代码是否有效；我从来没有亲眼见过它做它应该做的事情，使用这一切的功能是为了我们的一个客户的利益而创建的，而且在我被录用之前显然没有功能。
我需要知道要寻找什么来解决错误。如果有帮助，我尝试与之建立连接的远程计算机位于 VPN 隧道的远程端，并且我们确实通过我们使用的其他软件建立了连接。
帮助？