iOS-Upload image to OneDrive using REST API - ios

Question

I am trying to upload image from my app to onedrive using the REST api they provided.
But missing some formating for PST method, please help to work out.
I am doing as,
NSString *urlString = [NSString stringWithFormat:#"https://apis.live.net/v5.0/me/skydrive/files?access_token=%#",oneDriveAccessToken];
NSMutableURLRequest *request =[[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:#"POST"];
NSString *boundary = #"A300x";
NSString *contentType = [NSString stringWithFormat:#"multipart/form-data; boundary=%#",boundary];
[request addValue:contentType forHTTPHeaderField: #"Content-Type"];
//-- Append data into post url using following method
NSMutableData *body = [NSMutableData data];
//-- "image_name" is file name of the image (we can set custom name)
[body appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition:form-data; name=\"file\"; filename=\"%#\"\n",#"name.JPG"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[#"Content-Type: application/octet-stream\n\r\n\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:data]];
[body appendData:[[NSString stringWithFormat:#"--%#--",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
//-- Sending data into server through URL
[request setHTTPBody:body];
//-- Getting response form server
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
//-- JSON Parsing with response data
NSDictionary *result = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:nil];
NSLog(#"Result = %#",result);
I am getting response as:
Result = {
error = {
code = "request_body_invalid";
message = "The request entity body for multipart form-data POST isn't valid. The expected format is:
\n--[boundary]
\nContent-Disposition: form-data; name=\"file\"; filename=\"[FileName]\"
\nContent-Type: application/octet-stream
\n[CR][LF]
\n[file contents]
\n--[boundary]--[CR][LF]";
};
}
I am following this http://msdn.microsoft.com/en-us/library/hh826531.aspx#uploading_files
After suggestions of Jeffery, error message as,
Result = { error = { code = "request_body_invalid"; message = "The
request entity body has an incorrect value in the 'Content-Disposition'
header. The expected format for this value is 'Content-Disposition: form-
data; name=\"file\"; filename=\"[FileName]\"'."; }; }

Answer 1

As a guess, you are mangling the line endings. Sometimes you are using \n sometimes \r\n. You must always use \r\n. As a side note, you shouldn't need the initial \r\n on your first -appendData call. Finally, check your boundary string: they are usually longer to avoid the having those exact same bytes in the content.
NSString *boundary = #"A300x-make-it-longer-to-reduce-risk-12345";
…
[body appendData:[[NSString stringWithFormat:#"--%#\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:#"Content-Disposition:form-data; name=\"file\"; filename=\"%#\"\r\n", #"name.JPG"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[#"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:data]];
[body appendData:[[NSString stringWithFormat:#"--%#--", boundary] dataUsingEncoding:NSUTF8StringEncoding]];