(Node.js) Unzip Some Files by Iterating over Entries

Demonstrates how to unzip specific files by iterating over entries in a .zip.

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

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var zip = new chilkat.Zip();

    // Open a .zip containing:
    // 
    // a1.xml
    // b1.xml
    // c1.xml
    // dir1/a2.xml
    // dir1/c2.xml
    // dir2/dir3/c3.xml

    // We wish to unzip only a1.xml, b1.xml, and c1.xml
    var success = zip.OpenZip("qa_data/zips/xml_files.zip");
    if (success !== true) {
        console.log(zip.LastErrorText);
        return;
    }

    var sbFilename = new chilkat.StringBuilder();

    var numEntries = zip.NumEntries;
    var i = 0;
    while (i < numEntries) {
        // entry: ZipEntry
        var entry = zip.GetEntryByIndex(i);

        var entryFilePath = entry.FileName;
        console.log(entryFilePath);

        if (entry.IsDirectory == false) {
            sbFilename.SetString(entryFilePath);
            if (sbFilename.Contains("/",false) == false) {
                // Does not contain "/"
                // Unzip to the qa_output directory.
                success = entry.Extract("qa_output");
                if (success == false) {
                    console.log("Failed to unzip " + entryFilePath);
                }
                else {
                    console.log("Unzipped " + entryFilePath);
                }

            }

        }

        i = i+1;
    }


}

chilkatExample();