(Swift 3,4,5...) Read/Write JSON with Binary Data such as JPEG Files

Demonstrates how binary files could be stored in JSON in base64 format. Creates JSON containing the contents of a JPG file, and then reads the JSON to extract the JPEG image.

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

func chilkatTest() {
    // First load a small JPG file..
    let bd = CkoBinData()!

    var success: Bool = bd.loadFile("qa_data/jpg/starfish20.jpg")
    // Assume success, but your code should check for success..

    // Create JSON containing the binary data in base64 format.
    let json1 = CkoJsonObject()!
    json1.updateBd("starfish", encoding: "base64", bd: bd)

    var jsonStr: String? = json1.emit()
    print("\(jsonStr!)")

    // Here's the output:
    // {"starfish":"/9j/4AAQSkZJRgA ... cN2iuLFsCEbDGxQkI6RO/n//2Q=="}

    // Let's create a new JSON object, load it with the above JSON, and extract the JPG image..
    let json2 = CkoJsonObject()!
    json2.load(jsonStr)

    // Get the binary bytes.
    let bd2 = CkoBinData()!
    json2.bytes(of: "starfish", encoding: "base64", bd: bd2)

    // Save to a file.
    success = bd2.writeFile("qa_output/starfish20.jpg")

    print("Success.")

}