Use AFNetworking to download a file from Django server - ios

Question

I am using AFNetworking to send a HTTP request to a Django server to download a file to iPhone. However, neither do the console print out "Success" or "Error". I also cannot find the file in the specific dir ".../database". For the server side, the log file is correct ([22/Jan/2015 16:45:49] "GET /main/receivefile/ HTTP/1.1" 200 16811) and I can see the request and there is no error. This is my client side code:
var parameters = ["username":"u987103"];
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let outPath = String(format: "%#/database/tmp.txt", documentsPath)
self.man = AFHTTPRequestOperationManager()
self.op = self.man.GET(url, parameters: parameters,
success: {(operation:AFHTTPRequestOperation!,responseObject:AnyObject!) in
println("Success")
}
, failure:{(operation:AFHTTPRequestOperation!,error:NSError!) in
println("Error: %#",error);
})
op.outputStream = NSOutputStream(toFileAtPath: outPath, append: false)
The code corresponding to the request URL in the Django server is:
def retrieve_file(request):
filename = os.path.basename(m_path)
path = os.path.join(settings.MEDIA_ROOT,m_path)
wrapper = FileWrapper(file(path))
response = HttpResponse(wrapper,content_type="text/plain")
response['Content-Disposition'] = 'attachment; filename="'+filename+'"'
return response
I have tested to download the file using Chrome and as soon as I enter the URL and hit "enter", the file is downloaded to my download folder. So could anyone tell me why it does not work for AFNetwokring?

Answer 1

Yes that is correct.
Take a look at the doc here - http://cocoadocs.org/docsets/AFNetworking/2.0.0/Classes/AFHTTPRequestOperationManager.html#//api/name/responseSerializer. You need to specify a response serializer for AFHttpRequestOperationManager.
It seems like you are downloading a plain text file, so you can use the default serializer. Add this call:
self.man.responseSerializer = AFHttpResponseSerializer()
before you call self.man.GET.
The https://github.com/AFNetworking/AFNetworking/wiki/AFNetworking-2.0-Migration-Guide has some details on how the response and request serializers work.

Answer 2

The code below is the correct way to do it for AFNetwokring 2.5.0
Reference: http://cocoadocs.org/docsets/AFNetworking/2.5.0/
var configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
var man = AFURLSessionManager(sessionConfiguration: configuration)
var URL = NSURL(string: "http://www.google.com/images/srpr/logo11w.png")
var request = NSURLRequest(URL:URL!)
var downloadTask = man.downloadTaskWithRequest(request, progress: nil,
destination:{(targetPath:NSURL!,response:NSURLResponse!) -> NSURL! in
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let outPath = String(format: "%#/download/", documentsPath)
var url:NSURL! = NSURL(fileURLWithPath: outPath)
return url.URLByAppendingPathComponent(response.suggestedFilename as String!)
},
completionHandler:{(response:NSURLResponse!,filePath:NSURL!,error:NSError!) in
println(response.suggestedFilename)
})
downloadTask.resume();