问题
I'm writing a program that uses an ftp server with credentials. I'm trying to retrieve the directory list from the server but when I get to the line:
string line = reader.ReadLine();
the string that I get contains only : "Can't open \"host:/lib1\"."
If I try to get another line, the next exception is thrown: The remote server returned an error: (550) File unavailable (e.g., file not found, no access).
I know for sure (using another ftp application) that 'lib1' directory exists on the ftp server and my credentials (username and password) are correct.
Here is my code:
public class FTPClient
{
public string UserName { get; set; }
public string Password { get; set; }
public string IpAddress { get; set; }
public int Port { get; set; }
public FTPClient(string _userName, string _password, string _address, int _port)
{
UserName = _userName;
Password = _password;
IpAddress = _address;
Port = _port;
}
public void GetDirectoriesList(string _path)
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" +
IpAddress + _path));
request.UseBinary = true;
request.Method = WebRequestMethods.Ftp.ListDirectory;
request.Credentials = new NetworkCredential(UserName, Password);
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
string line = reader.ReadLine();
while (line!=null)
{
... //do something with line
line = reader.ReadLine();
}
...
reader.Close();
response.Close();
}
And I use it as follows:
FTPClient ftpClient = new FTPClient("user1", "pass1", "192.168.2.110", 21);
string dirList = ftpClient.GetDirectoriesList("/lib1");
Can anyone spot the problem?
回答1:
My solution:
public string[] GetDirectory()
{
StringBuilder result = new StringBuilder();
FtpWebRequest requestDir = (FtpWebRequest)WebRequest.Create("ftp://urserverip/");
requestDir.Method = WebRequestMethods.Ftp.ListDirectory;
requestDir.Credentials = new NetworkCredential("username", "password");
FtpWebResponse responseDir = (FtpWebResponse)requestDir.GetResponse();
StreamReader readerDir = new StreamReader(responseDir.GetResponseStream());
string line = readerDir.ReadLine();
while (line != null)
{
result.Append(line);
result.Append("\n");
line = readerDir.ReadLine();
}
result.Remove(result.ToString().LastIndexOf('\n'), 1);
responseDir.Close();
return result.ToString().Split('\n');
}
回答2:
Some refinements to Abdul Waheed's answer:
- Added
using
blocks to clean up theFtpWebResponse
andStreamReader
objects; Reduced string manipulation:
private static string[] GetDirectoryListing() { FtpWebRequest directoryListRequest = (FtpWebRequest)WebRequest.Create("ftp://urserverip/"); directoryListRequest.Method = WebRequestMethods.Ftp.ListDirectory; directoryListRequest.Credentials = new NetworkCredential("username", "password"); using (FtpWebResponse directoryListResponse = (FtpWebResponse)directoryListRequest.GetResponse()) { using (StreamReader directoryListResponseReader = new StreamReader(directoryListResponse.GetResponseStream())) { string responseString = directoryListResponseReader.ReadToEnd(); string[] results = responseString.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.RemoveEmptyEntries); return results; } } }
来源:https://stackoverflow.com/questions/4584789/connecting-ftp-server-with-credentials