(JavaScript) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

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;

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

var zip = new CkZip();

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

// Add a small text file from memory.
success = zip.AddString("myApp/docs/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 CkZip();

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

// Find the entry by its stored ZIP path.
var entry = new CkZipEntry();

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

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

// Extract this single entry to the base directory:
// 
//     c:/temp/extracted
// 
// Because the entry's stored path is:
// 
//     myApp/docs/hello.txt
// 
// the file will be extracted to:
// 
//     qa_output/extracted/myApp/docs/hello.txt
// 
// The required subdirectories are created automatically.
success = entry.Extract("c:/temp/extracted");
if (success == false) {
    console.log(entry.LastErrorText);
    return;
}

zip2.CloseZip();

console.log("Entry extracted successfully.");