How to upload file to box from ios app? -

i got following box developers site.

curl https://upload.box.com/api/2.0/files/content \ -h "authorization: bearer access_token" \ -f filename=@file_name \ -f parent_id=parent_folder_id 

• f indicates ? how make request url ?

-f: emulate filled-in form in user has pressed submit button. causes curl post data using content-type multipart/form-data according rfc 2388 standard. -f accepts parameters -f "name=contents" contents read file, use <@filename> contents. when specifying file, can specify file content type appending ';type=' file name.

emulate fill-in form -f. let's fill in 3 fields in form. 1 field file name post, 1 field name , 1 field file description. want post file have written named "cooltext.txt".

curl example (sending couple fields , file):

    curl -f "file=@cooltext.txt" -f "yourname=daniel" \           -f "filedescription=cool text file cool text inside" \           http://www.post.com/postit.cgi 

objective-c example (sending 1 form value):

/*  * create mutable url request , method post content type form  */ nsmutableurlrequest *request = [nsmutableurlrequest requestwithurl:[nsurl urlwithstring:@"http://www.exmaple.com/post"]]; [request sethttpmethod:@"post"]; [request setvalue:@"application/x-www-form-urlencoded" forhttpheaderfield:@"content-type"];  /*  * build http body  */ nsdata *data = [@"firstname" datausingencoding:nsutf8stringencoding]; [request sethttpbody:data]; [request setvalue:[nsstring stringwithformat:@"%u", data.length] forhttpheaderfield:@"content-length"];  /*  * make request , return result  */ nserror *error; nshttpurlresponse *response; nsdata *result = [nsurlconnection sendsynchronousrequest:request returningresponse:&response error:&error];  if (error) {     nslog(@"request error: %@", error);      return; }  nsstring *formattedresult = [[nsstring alloc] initwithdata:result encoding:nsutf8stringencoding]; nslog(@"result: %@ http headers: %@", formattedresult, response.allheaderfields); 

references:
curl man pages
rfc 2388 standard