(Swift) Remove an Entry from an Existing ZIP Using DeleteEntry

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    var success: Bool = false

    success = false

    // ------------------------------------------------------------
    // First create a ZIP archive containing three text files.

    let zip = CkoZip()!

    success = zip.newZip("original.zip")
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    var charset: String? = "utf-8"

    success = zip.addString("a.txt", content: "Contents of file A", charset: charset)
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    success = zip.addString("b.txt", content: "Contents of file B", charset: charset)
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    success = zip.addString("c.txt", content: "Contents of file C", charset: charset)
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    // Write the ZIP archive to disk.
    // 
    // The ZIP now contains:
    // 
    //     a.txt
    //     b.txt
    //     c.txt
    // 
    success = zip.writeAndClose()
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    // ------------------------------------------------------------
    // Open the existing ZIP archive for modification.

    let zip2 = CkoZip()!

    success = zip2.open("original.zip")
    if success == false {
        print("\(zip2.lastErrorText!)")
        return
    }

    // Find the entry named "b.txt".
    let entry = CkoZipEntry()!

    success = zip2.entry(of: "b.txt", entry: entry)
    if success == false {
        print("\(zip2.lastErrorText!)")
        return
    }

    // Remove the entry from the in-memory ZIP object.
    // 
    // At this point, the original ZIP file on disk is unchanged.
    // The deletion takes effect only after WriteZip or
    // WriteZipAndClose is called.
    success = zip2.delete(entry)
    if success == false {
        print("\(zip2.lastErrorText!)")
        return
    }

    // Write the modified ZIP archive to a new file.
    zip2.fileName = "modified.zip"

    success = zip2.writeAndClose()
    if success == false {
        print("\(zip2.lastErrorText!)")
        return
    }

    // The modified ZIP now contains:
    // 
    //     a.txt
    //     c.txt
    // 

    print("ZIP archive updated successfully.")

}