/// <summary>
/// 选择模式并创建数据连接
/// </summary>
/// <param name="dataSocket"></param>
/// <param name="dataHelper"></param>
private void InitDataConnection(out Socket dataSocket, out SocketHelper dataHelper)
{
string line;
int status;
// EPSV => 229;
_commandHelper.Writeln("EPSV");
line = System.Text.Encoding.UTF8.GetString(_commandHelper.Readln(out status));
if (status == 229)
{
string dataConnection = line;
// 创建数据连接
dataSocket = CommandHelper.AddressParserAndConnect(1, dataConnection, _serverIpe.Address);
dataHelper = new SocketHelper(dataSocket);
}
else if (status / 100 == 5) // 不支持 EPSV, 使用 PASV
{
// PASV => 227;
_commandHelper.Writeln("PASV");
line = System.Text.Encoding.UTF8.GetString(_commandHelper.Readln(out status));
if (status == 227)
{
string dataConnection = line;
// 创建数据连接
dataSocket = CommandHelper.AddressParserAndConnect(0, dataConnection);
dataHelper = new SocketHelper(dataSocket);
}
else
{
throw new FTPClientException(status, line);
}
}
else
{
throw new FTPClientException(status, line);
}
}