(JavaScript) Replace/Update a FIle in a .zip

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten.

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

// First prepare a .zip and write it..
var zip = new CkZip();

zip.NewZip("qa_output/abc.zip");

// Add some files..
var charset = "utf-8";
zip.AddString("a.txt","aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",charset);
zip.AddString("b.txt","bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",charset);
zip.AddString("c.txt","cccccccccccccccccccccccccccccccccccc",charset);

// Write to qa_output/abc.zip
// This .zip contains three files: a.txt, b.txt, and c.txt
success = zip.WriteZipAndClose();

// -------------------------------------------------------------------
// Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
var zip2 = new CkZip();
zip2.OpenZip("qa_output/abc.zip");

var entry = new CkZipEntry();
if (zip2.EntryOf("b.txt",entry) == true) {
    entry.ReplaceString("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb","utf-8");
}

// Write the modified .zip back to "abc.zip"
success = zip2.WriteZipAndClose();

console.log("success.");