Node.js

Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

See more Zip Examples

This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // ------------------------------------------------------------
    // First create a sample ZIP archive containing a small text file.

    var zip = new chilkat.Zip();

    success = zip.NewZip("c:/temp/sampleText.zip");
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    // Add a small text file from memory.
    // The text is stored in the ZIP as "hello.txt".
    success = zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8");
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    // Write the ZIP archive to disk and close it.
    success = zip.WriteZipAndClose();
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    // ------------------------------------------------------------
    // Now open the ZIP archive we just created.

    var zip2 = new chilkat.Zip();

    success = zip2.OpenZip("c:/temp/sampleText.zip");
    if (success == false) {
        console.log(zip2.LastErrorText);
        return;
    }

    // Get the text file entry.
    var entry = new chilkat.ZipEntry();

    success = zip2.EntryOf("hello.txt",entry);

    if (success == false) {
        console.log("Entry not found.");
        return;
    }

    // Get the compressed ZIP entry data as Base64.
    // 
    // This is the compressed data stored inside the ZIP file,
    // not the uncompressed text "Hello from a ZIP entry!".
    var b64 = entry.CopyToBase64();

    console.log("Base64 compressed ZIP entry data:");
    console.log(b64);

    zip2.CloseZip();

    console.log("Done.");

}

chilkatExample();