(Node.js) FTP Download Binary File to a Stream

Demonstrates how to FTP download a binary file to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example assumes the Chilkat FTP2 API to have been previously unlocked.
    // See FTP2 Unlock Sample for sample code.

    var ftp = new chilkat.Ftp2();

    ftp.Hostname = "www.my-ftp-server.com";
    ftp.Username = "mFtpLogin";
    ftp.Password = "myFtpPassword";
    ftp.AuthTls = true;
    ftp.Passive = true;

    // Connect and login to the FTP server using TLS.
    var success = ftp.Connect();
    if (success !== true) {
        console.log(ftp.LastErrorText);
        return;
    }

    // We'll read the incoming data chunk-by-chunk and write to an output file.
    var fac = new chilkat.FileAccess();
    success = fac.OpenForWrite("qa_output/penguins2.jpg");
    if (success !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    var streamObj = new chilkat.Stream();

    // Create a task to do the FTP download.
    // t: Task
    var t = ftp.GetFileToStreamAsync("penguins2.jpg",streamObj);
    if (ftp.LastMethodSuccess !== true) {
        console.log(ftp.LastErrorText);
        return;
    }

    // Start the task in a background thread.
    t.Run();

    var bd = new chilkat.BinData();
    while (streamObj.EndOfStream !== true) {
        // Get the next chunk of JPG bytes.
        streamObj.ReadBd(bd);
        // Do something with it..
        // In this simple example, we'll just write to the file.
        fac.FileWriteBd(bd,0,0);
        // Clear for the next read.
        bd.Clear();
    }

    fac.FileClose();

    console.log("Success.");

}

chilkatExample();