Ruby

Count Files in a Remote FTP Directory

Demonstrates the Chilkat Ftp2.GetDirCount method, which returns the number of files and directories in the current remote directory. It takes no arguments; the first call retrieves the listing, and the count reflects the case-insensitive ListPattern filter. A negative return indicates failure.

Background: GetDirCount is the entry point to Chilkat's index-based directory API: its first call fetches the listing for the current directory into a cache, and the returned count establishes the valid index range (0 through count - 1) for the accessor methods that read names, sizes, and attributes. The ListPattern property narrows the listing to matching names before counting, which is how you list, say, only *.html without filtering in your own code.

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require 'chilkat'

success = false

#  Demonstrates the Ftp2.GetDirCount method, which returns the number of files and directories in
#  the current remote directory's listing.  It takes no arguments.  The first call retrieves the
#  listing; the count reflects the case-insensitive ListPattern filter.

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.example.com")
ftp.put_Username("myFtpLogin")

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
ftp.put_Password("myPassword")

success = ftp.Connect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

success = ftp.ChangeRemoteDir("public_html")
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

#  Optionally filter the listing with a wildcard pattern.  "*" (the default) matches everything.
ftp.put_ListPattern("*.html")

n = ftp.GetDirCount()
if (n < 0)
    print ftp.lastErrorText() + "\n";
    exit
end

print "Matching entries: " + n.to_s() + "\n";

#  The count defines the valid index range 0 through n-1 for the indexed accessor methods.

for i in 0 .. n - 1
    name = ftp.getFilename(i)
    print name + "\n";
end

success = ftp.Disconnect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end