Uploading Files from iPhone

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We recently completed an iPhone application that allows user to, among other things, perform voice-recording and upload the recorded file to a server. For uploading, it uses HTTP multipart POST against an Apache webserver. This type of arrangement is a very common way of sending a file to a webserver. I am certain that similar implementations can be found in several different programming languages. Here is my Objective C implementation…I tried to focus on brevity and encapsulation.


The code:


/**
 * Upload a file to a webserver thru http post.
 * uid is the http request id
 * requestData is list of key/value pairs to be sent along with the file
 * url is the destination url
 * filePath is absolute file path of the file to be uploaded
 */
- (void)postUpload:(NSString *)url
                  :(NSString *)uid
                  :(NSDictionary *)requestData
                  :(NSString *)filePath
{
  NSURL *theURL = [NSURL URLWithString:url];
  NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:theURL 
               cachePolicy:NSURLRequestReloadIgnoringCacheData 
           timeoutInterval:20.0f];
  [theRequest setHTTPMethod:@"POST"];
  [theRequest setValue:uid forHTTPHeaderField:@"uid"];
  
  // define post boundary...
  NSString *boundary = [[NSProcessInfo processInfo] globallyUniqueString];
  NSString *boundaryString = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
  [theRequest addValue:boundaryString forHTTPHeaderField:@"Content-Type"];
  
  // viagra 25mg define boundary separator...
  NSString *boundarySeparator = [NSString stringWithFormat:@"--%@\r\n", boundary];
  
  //adding the body...
  NSMutableData *postBody = [NSMutableData data];
  
  // adding params...
  for (id key in 
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requestData) { NSString *formDataName = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key]; NSString *formDataValue = [NSString stringWithFormat:@"%@\r\n", [requestData objectForKey:key]]; [postBody appendData:[boundarySeparator dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[formDataName dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[formDataValue dataUsingEncoding:NSUTF8StringEncoding]]; } // if file is defined, upload it... if (filePath) { NSArray *split = [filePath componentsSeparatedByString:@"/"]; NSString *fileName = (NSString*)[split lastObject]; NSData *fileContent = [NSData dataWithContentsOfFile:filePath options:0 error:nil]; [postBody appendData:[boundarySeparator dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"audioBody\"; filename=\"%@\"\r\n", fileName] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:fileContent]; } [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r \n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [theRequest setHTTPBody:postBody]; NSURLResponse *theResponse = NULL; NSError *theError
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= NULL; NSData *reqResults = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&theError]; if (!reqResults) { NSLog(@"Connection error for URL: %@", [url description]); UIAlertView *alert = [UIAlertView alloc]; [[alert initWithTitle:@"Error in connection" message:[theError localizedDescription] delegate:self cancelButtonTitle:nil otherButtonTitles:@"Quit", nil] autorelease]; [alert show]; } }
Here’s an example of how

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you can use this method:


NSArray *keys =[NSArrayarrayWithObjects:@"recipients", @"title", @"textBody", nil];
NSArray *objects = [NSArray arrayWithObjects:uids, inputSubject.text, inputMessage.text, nil];
NSDictionary* postData = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

// post now…
[[WebServicealloc] postUpload:URL_ENDPOINT_SEND_MESSAGE
                :appDelegate.uid
                :postData
                :[recorder recordFilePath]];
URL_ENDPOINT_SEND_MESSAGE is set to the URL that can receive a multipart POST. To test this out, I have quickly written the following PHP code.

<?php
  define(‘FILE_SAVE_DIRECTORY’,‘/folder/to/save/uploaded/files/’);
  error_log(“Requesting upload file….”);
  error_log(print_r($_SERVER, true));
  error_log(“\n\n”);
  error_log(print_r($_FILES, true));
  if ($_POST && isset($_FILES['file'])) {
    error_log(“  the file:….” . $_FILES['file']['name']);
    $file = $_FILES['file'];
    $dst = FILE_SAVE_DIRECTORY . basename($file['name']);
    if (move_uploaded_file($file['tmp_name'], $dst)){
      echo ‘Upload Successfully: ‘.$dst;
  
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} else { echo ‘Error uploading the file.’; } } ?>
Put this code in your php-enabled webserver. Then, set URL_ENDPOINT_SEND_MESSAGE to point to the script.
It’s that simple. Now you’re ready to use HTTP upload in your next iPhone project.

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