(Swift) Find ZIP Entries Matching a Wildcard Pattern Using EntryMatching

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This example demonstrates how to use the EntryMatching method to find ZIP entries whose stored paths match a wildcard pattern.

The wildcard character * matches zero or more characters. The comparison is performed against the full stored path within the ZIP archive.

This method is useful for:

• Finding files having a particular extension
• Locating files within specific subdirectories
• Searching ZIP archives without manually iterating through every entry

Suppose the ZIP archive contains:

docs/
docs/readme.txt
docs/manual.pdf
images/logo.png
images/banner.jpg
data/config/settings.json

Notice that the ZIP archive contains an explicit directory entry named docs/. ZIP archives may optionally contain separate directory entries in addition to file entries.

When searching with the pattern docs/*, the first matching entry could therefore be the directory entry docs/ rather than a file contained within that directory.

The example searches for:

• The first .png file
• The first entry beneath the docs directory
• The first JSON file anywhere within the ZIP archive

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

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func chilkatTest() {
    var success: Bool = false

    success = false

    // Open an existing ZIP archive.
    let zip = CkoZip()!

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

    let entry = CkoZipEntry()!

    // ------------------------------------------------------------
    // Find the first .png file in the ZIP archive.

    success = zip.entry(matching: "*.png", entry: entry)

    if success == true {
        print("Found PNG file:")
        print("  \(entry.fileName!)")
        print("")
    }

    // ------------------------------------------------------------
    // Find the first entry beneath the docs directory.
    // 
    // Note: ZIP archives may optionally contain explicit directory
    // entries such as "docs/" in addition to file entries.
    // Therefore, the first matching entry could be the directory
    // itself rather than a file contained within the directory.

    success = zip.entry(matching: "docs/*", entry: entry)

    if success == true {
        print("First matching docs entry:")
        print("  \(entry.fileName!)")
        print("  IsDirectory = \(entry.isDirectory)")
        print("")
    }

    // ------------------------------------------------------------
    // Find the first JSON file anywhere in the ZIP archive.

    success = zip.entry(matching: "*.json", entry: entry)

    if success == true {
        print("Found JSON file:")
        print("  \(entry.fileName!)")
        print("")
    }

    // ------------------------------------------------------------
    // The matching is performed against the full stored ZIP path.
    // For example:
    // 
    //     docs/readme.txt
    //     images/logo.png
    //     data/config/settings.json
    // 
    // The wildcard '*' matches zero or more characters.

    zip.close()

    print("Done.")

}