Java

Get an FTP Listing Entry's Size (32-bit)

Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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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.GetSize method, which returns the size in bytes of a cached
        // directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

        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;
        }

        // GetDirCount retrieves the directory listing on the first call and returns the number of
        // entries.  A negative return indicates failure.
        int n = ftp.getDirCount();
        if (n < 0) {
            System.out.println(ftp.getLastErrorText());
            return;
        }

        for (int i = 0; i < n; i++) {
            String name = ftp.getFilename(i);

            // GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
            // directory).  Use GetSize64 for files that may exceed 2 GB.
            int fileSize = ftp.getSize(i);
            System.out.println(name + "  " + fileSize + " bytes");
        }

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