Java

Write Text at a String Offset in a Remote SFTP File

Demonstrates the Chilkat SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the charset, and the text.

Background: Some programming languages Chilkat targets lack a native 64-bit integer type, or make large integer literals awkward. Passing the offset as a decimal string sidesteps that entirely — the value is parsed by the library — while addressing the same large-file positions as the int64 form.

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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.SFtp;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the
        // byte offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string,
        // the 3rd is the charset, and the 4th is the text.

        SFtp sftp = new SFtp();

        // Connect, authenticate, and initialize the SFTP subsystem.
        int port = 22;
        try {
            sftp.connect("sftp.example.com", port);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // 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.
        String password = "mySshPassword";

        String handle;
        try {
            sftp.authenticatePw("mySshLogin", password);

            sftp.initializeSftp();

            handle = sftp.openFile("subdir/hugefile.dat", "readWrite", "openOrCreate");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Supplying the offset as a string is convenient in languages without a native 64-bit integer.
        String offset = "5000000000";
        try {
            sftp.writeFileText64s(handle, offset, "utf-8", "MARKER");

            sftp.closeHandle(handle);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Wrote at the string offset.");

        sftp.disconnect();
    }
}