(Swift 3,4,5...) OneDrive -- List Large Directory

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Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

Note: This example requires Chilkat v9.5.0.97 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.

    // This example uses the OAuth client credentials flow.
    // See How to Create an Azure App Registration for OAuth 2.0 Client Credentials

    // Use your client ID, client secret, and tenant ID in the following lines
    let json = CkoJsonObject()!
    json.update("client_id", value: "2871da2c-8176-4b7f-869b-2311aa82e743")
    json.update("client_secret", value: "2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH")
    json.update("scope", value: "https://graph.microsoft.com/.default")
    json.update("token_endpoint", value: "https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token")

    let http = CkoHttp()!
    http.authToken = json.emit()

    // This example will get the DriveItems in /lots-of-files, which has 450 children..
    http.setUrlVar("item_path", value: "/lots-of-files")
    http.setUrlVar("user_id", value: "4fe732c3-322e-4a6b-b729-2fd1eb5c6104")

    var resp: String?
    var i: Int
    var numItems: Int

    json.emitCompact = false

    // This loop will download DriveItems in sets of 25 until no more exist.
    var bGetMore: Bool = true
    // (Add the $top query parameter to define the page size, i.e. the max number of results to return).
    var nextLink: String? = "https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:{$item_path}:/children?$top=25"

    while (bGetMore == true) {

        // Get the next chunk of DriveItems
        resp = http.quickGetStr(nextLink)
        if http.lastMethodSuccess != true {
            print("\(http.lastErrorText!)")
            return
        }

        // The response should be JSON.
        json.load(resp)

        // A successful response should return a status code of 200.
        if http.lastStatus.intValue != 200 {
            print("\(json.emit()!)")
            print("Response status = \(http.lastStatus.intValue)")
            return
        }

        // Iterate over the DriveItems in the JSON response:
        i = 0
        numItems = json.size(ofArray: "value").intValue
        while i < numItems {
            json.i = i
            print("name: \(json.string(of: "value[i].name")!)")
            i = i + 1
        }

        // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
        // Otherwise, exit the loop.
        if json.hasMember("\"@odata.nextLink\"") == true {
            nextLink = json.string(of: "\"@odata.nextLink\"")
            print("nextLink: \(nextLink!)")
        }
        else {
            bGetMore = false
        }

    }


}