(Swift 2) Download Photo to a File

Assuming we have the ID of a Photo, this example demonstrates how to download the photo image data to a file.

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

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

    // This example assumes a previously obtained an access token
    let oauth2 = CkoOAuth2()
    oauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN"

    let rest = CkoRest()

    // Connect to Facebook...
    var success: Bool = rest.Connect("graph.facebook.com", port: 443, tls: true, autoReconnect: true)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    // Provide the authentication credentials (i.e. the access key)
    rest.SetAuthOAuth2(oauth2)

    // Assumes we've already obtained a Photo ID.
    var photoId: String? = "10210199026347451"

    let sbPath = CkoStringBuilder()
    sbPath.Append("/v2.7/")
    sbPath.Append(photoId)

    // First we're going to get the photo informaton so we can get the URL of the image file data.
    // Select the fields we want.
    // See https://developers.facebook.com/docs/graph-api/reference/photo/
    rest.AddQueryParam("fields", value: "id,album,images")

    var responseJson: String? = rest.FullRequestNoBody("GET", uriPath: sbPath.GetAsString())
    if rest.LastMethodSuccess != true {
        print("\(rest.LastErrorText)")
        return
    }

    let json = CkoJsonObject()
    json.EmitCompact = false
    json.Load(responseJson)

    // Show the JSON in human-readable format.
    print("\(json.Emit())")

    // Get the image URL.
    var imageUrl: String? = json.StringOf("images[0].source")
    print("Downloading from \(imageUrl!)")

    let sbImageUrl = CkoStringBuilder()
    sbImageUrl.Append(imageUrl)

    // Build the output local file path.
    let sbToPath = CkoStringBuilder()
    sbToPath.Append("qa_output/fb")
    sbToPath.Append(json.StringOf("id"))
    var bCaseSensitive: Bool = false
    if sbImageUrl.Contains(".jpg", caseSensitive: bCaseSensitive) == true {
        sbToPath.Append(".jpg")
    }
    else {
        sbToPath.Append(".png")
    }

    print("Downloading to \(sbToPath.GetAsString())")

    // Download using Chilkat HTTP.
    let http = CkoHttp()
    success = http.Download(imageUrl, saveToPath: sbToPath.GetAsString())
    if success != true {
        print("\(http.LastErrorText)")
    }
    else {
        print("Downloaded.")
    }


}