(Swift 3,4,5...) Facebook Upload Photo from Local File

Uploads a new photo with a caption from a local 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 assumes Chilkat HTTP to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!

    let req = CkoHttpRequest()!
    req.httpVerb = "POST"
    req.contentType = "multipart/form-data"
    req.path = "/v2.7/me/photos"

    // Use the previously obtained access token.
    // Note: The publish_actions scope is required to upload a photo.
    req.addHeader("Authorization", value: "Bearer FACEBOOK-ACCESS-TOKEN")

    // Send an "Expect: 100-continue" header in the request.
    // This causes the HTTP server to end a 100-continue response
    // immediately after receiving the HTTP header.  The client
    // (Chilkat) will receive this intermediate response, and if
    // it's not an error response, it knows that the HTTP server will
    // accept the data that is forthcoming.
    // The alternative is to get an error response after trying to upload
    // the entire contents of the files.
    req.addHeader("Expect", value: "100-continue")

    // Set a photo caption.
    req.addParam("caption", value: "Here are some penguins!")

    // Additional parameters can be added to the request by 
    // calling AddParam once per parameter.  
    // See https://developers.facebook.com/docs/graph-api/reference/user/photos
    // for more information about other optional parameters.

    // Indicate the local file to be uploaded.
    var success: Bool = req.addFile(forUpload: "source", path: "qa_data/jpg/penguins2.jpg")
    if success != true {
        print("\(req.lastErrorText!)")
        return
    }

    // Upload the image file..
    var resp: CkoHttpResponse? = http.synchronousRequest("graph.facebook.com", port: 443, ssl: true, req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    // Examine the response body:
    var responseJson: String? = resp!.bodyStr
    print("\(responseJson!)")

    // The response contains JSON, such as this:
    // {"id":"10210224963435862","post_id":"10224048320139890_10210224963435862"}

    resp = nil

}