Java

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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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Ftp2;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.

        Ftp2 ftp = new Ftp2();

        ftp.setHostname("ftp.example.com");
        ftp.setUsername("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.setPassword("myPassword");

        try {
            ftp.connect();

            ftp.changeRemoteDir("public_html");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Optionally filter the listing with a wildcard pattern.  "*" (the default) matches everything.
        ftp.setListPattern("*.html");

        int n = ftp.getDirCount();
        if (n < 0) {
            System.out.println(ftp.getLastErrorText());
            return;
        }

        System.out.println("Matching entries: " + n);

        // The count defines the valid index range 0 through n-1 for the indexed accessor methods.
        for (int i = 0; i < n; i++) {
            String name = ftp.getFilename(i);
            System.out.println(name);
        }

        try {
            ftp.disconnect();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }
    }
}