C#

FtpWebRequest ftp  = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + server + "/"));
ftp.Method = WebRequestMethods.Ftp.ListDirectory;
WebResponse response = ftp.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());

static bool IsText(byte[] data)
{
    // this lower limit should be at least 4
    // for anything shorter, the chance that it is
    // binary but looks like text is far too big
    if (data.Length < 16)
        throw new Exception("Data is too short to guess the encoding");

    byte asciitester = 0;
    for (int i = 0; i < data.Length; i++)
        asciitester |= data[i];

    if (asciitester < 0x80)
        return true; //pure ASCII so probably text

    if (IsValidUTF8(data))
        return true; // valid UTF-8 is probably text

    if (IsValidUTF16(data))
        return true; // valid UTF-16 is probably text

    // possibly insert test for UTF-32, but it is exceedingly rare

    return false;
}
static bool IsValidUTF16(byte[] data)
{
    if ((data.Length & 1) == 1)
        return false;   // odd length can not be UTF-16
    bool LittleEndian;
    ushort BOM = BitConverter.ToUInt16(data, 0);
    if (BOM == 0xFFFE)
        LittleEndian = false;
    else if (BOM == 0xFEFF)
        LittleEndian = true;
    else
        return false;   // BOM is required for UTF-16

    bool SecondOfSurrogatePair = false;

    for (int i = 2; i < data.Length; i+=2)
    {
        int code;
        if (LittleEndian)
            code = data[i] | (data[i + 1] << 8);
        else
            code = (data[i] << 8) | data[i + 1];

        if (SecondOfSurrogatePair)
        {
            if (code < 0xDC00 || code > 0xDFFF)
                return false;
            SecondOfSurrogatePair = false;
        }
        else
        {
            if (code >= 0xD800 && code <= 0xDBFF)
                SecondOfSurrogatePair = true;
        }
    }

    return SecondOfSurrogatePair; // data ended but a second half a surrogate pair is expected
}
static bool IsValidUTF8(byte[] data)
{
    int index = 0;
    if (data[0] == 0xEF)
    {
        if (data[1] != 0xBB ||
            data[2] != 0xBF)
            return false;
        index = 3;
    }
    int mode = 0; // number of bytes it needs to complete the current code
    for (int i = index; i < data.Length; i++)
    {
        switch (mode)
        {
            case 0: // first byte
                if (data[i] < 0x80)
                    break;
                else if (data[i] < 0xC0)
                    return false; // 80 - C0 can not be a first byte
                else if (data[i] < 0xE0)
                    mode = 1; // start of 2-byte sequence
                else if (data[i] < 0xF0)
                    mode = 2; // start of 3-byte sequence
                else if (data[i] < 0xF5)
                    mode = 3; // start of 4-byte sequence
                else
                    return false; // invalid or restricted codes
                break;

            case 1: // some bytes needed
            case 2:
            case 3:
                if (data[i] < 0x80 || data[i] >= 0xC0)
                    return false; // incomplete code
                mode--;
                break;
            default:
                return false; // something got messed up
        }
    }
    // it will get here if there are no more bytes,
    // so if it still needs some, it can't be valid
    return mode == 0;
}

harold aptroot wrote:

"if and only if it was originally written as a text file, it is a text file"

PIEBALDconsult wrote:

I still want to know why the original poster wants to do this.

private void frmNotifier_FormClosing(object sender, FormClosingEventArgs e)<br />
{<br />
m_bIsWatching = false;<br />
m_Watcher.EnableRaisingEvents = false;<br />
m_Watcher.Dispose();<br />
<br />
string date, time,date1,time1;<br />
<br />
date =DateTime.Now.ToString("ddMMyyyy");<br />
time = DateTime.Now.ToString("hhmm tt");<br />
<br />
if (Directory.Exists("c:\\FileChangeLog"))<br />
{<br />
<br />
<br />
<br />
}<br />
else {<br />
Directory.CreateDirectory("C:\\FileChangeLog");<br />
}<br />
<br />
<br />
StreamWriter sw = new StreamWriter(@"c:\FileChangeLog\" + date + "@" + time + "log.txt");<br />
<br />
date1 = DateTime.Now.ToString("dd/MM/yyyy");<br />
time1 = DateTime.Now.ToString("hh:mm:ss:tt");<br />
lstNotification.Items.Add("Program ended at: " + date1 + " , " + time1);<br />
<br />
foreach (string sItem in lstNotification.Items)<br />
{<br />
sw.WriteLine(sItem);<br />
}<br />
sw.Close();<br />
}

private void frmNotifier_FormClosing(object sender, FormClosingEventArgs e)
   {
   m_bIsWatching = false;
   m_Watcher.EnableRaisingEvents = false;
   m_Watcher.Dispose();

   string date, time,date1,time1;
   date = DateTime.Now.ToString("ddMMyyyy");
   time = DateTime.Now.ToString("hhmm tt");

   if (Directory.Exists("c:\\FileChangeLog"))
      {
      }
   else 
      {
      Directory.CreateDirectory("C:\\FileChangeLog");
      }
   StreamWriter sw = new StreamWriter(@"c:\FileChangeLog\" + date + "@" + time + "log.txt");

   date1 = DateTime.Now.ToString("dd/MM/yyyy");
   time1 = DateTime.Now.ToString("hh:mm:ss:tt");
   lstNotification.Items.Add("Program ended at: " + date1 + " , " + time1);

   foreach (string sItem in lstNotification.Items)
      {
      sw.WriteLine(sItem);
      }
   sw.Close();
   }