(Swift 3,4,5...) Extract Embedded Files from PDF

Demonstrates how to get information about the embedded files (if any) contained within a PDF, and shows how to extract each file.

Note: This example requires Chilkat v9.5.0.95 or greater.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let pdf = CkoPdf()!

    var success: Bool = pdf.loadFile("qa_data/pdf/embedded_files/my_embedded_files_test.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    // Note: The embedded file functionality was added in Chilkat v9.5.0.95

    // How many embedded files exist within the opened PDF?
    var numFiles: Int = pdf.numEmbeddedFiles.intValue
    print("Number of embedded files: \(numFiles)")

    let json = CkoJsonObject()!
    json.emitCompact = false

    let bd = CkoBinData()!

    // Get information about each file, and extract each to the filesystem.
    var i: Int = 0
    while i < numFiles {

        success = pdf.getEmbeddedFileInfo(i, json: json)
        if success == false {
            print("\(pdf.lastErrorText!)")
            return
        }

        print("\(json.emit()!)")

        // Get the filename from the JSON.
        var filename: String? = "someFile.dat"

        // The filename SHOULD always be present..
        if json.hasMember("filename") == true {
            filename = json.string(of: "filename")
        }

        // Get the file data.
        success = pdf.getEmbeddedFileBd(i, bd: bd)
        if success == false {
            print("\(pdf.lastErrorText!)")
            return
        }

        // Save the contents of the bd to the filename (in the current working directory) in the filesystem.
        success = bd.writeFile(filename)
        if success == false {
            print("Failed to write output file.")
        }

        i = i + 1
    }

    // Sample output for the above code:

    // Number of embedded files: 3
    // {
    //   "filename": "employees.json",
    //   "desc": "JSON",
    //   "subType": "application/json",
    //   "size": 159,
    //   "creationDate": "D:20230715170506-05'00'",
    //   "modDate": "D:20160207153838-05'00'"
    // }
    // 
    // {
    //   "filename": "rsaPubKey.pem",
    //   "desc": "RSA Public Key PEM",
    //   "size": 451,
    //   "creationDate": "D:20230715170546-05'00'",
    //   "modDate": "D:20150724133153-05'00'"
    // }
    // 
    // {
    //   "filename": "starfish.jpg",
    //   "desc": "Starfish JPG",
    //   "subType": "image/jpeg",
    //   "size": 6229,
    //   "creationDate": "D:20230715170356-05'00'",
    //   "modDate": "D:20080529103055-05'00'"
    // }

}