request to send from iphone data and files to server using http post

-(NSMutableURLRequest *)requestWithURL:(NSURL *)url withBody:(NSMutableDictionary *)body  withUrlAndAttachedFile:(NSString *)fileAndUrl withFileName:(NSString *)fileName withFileFormat:(NSString *)fileFormat

{
    NSMutableURLRequest *request;
    NSString *requestBody;
       
    request = [[NSMutableURLRequest alloc] initWithURL:url
                                           cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                       timeoutInterval:60];
   
    request= [[[NSMutableURLRequest alloc] init] autorelease];
    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
    NSMutableData *postbody = [NSMutableData data];
    [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file_0\"; filename=\"%@.%@\"\r\n", fileName, fileFormat] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    NSData *postData = [[NSData alloc] initWithContentsOfURL:[NSURL fileURLWithPath:fileAndUrl]];
    [postbody appendData:[NSData dataWithData:postData]];
    [postbody appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
   
   
    // iterate body dict
    NSEnumerator *enumerator = [body keyEnumerator];
    id key;
    // extra parens to suppress warning about using = instead of ==
    while((key = [enumerator nextObject])){
        //NSLog(@"key=%@ value=%@", key, [body objectForKey:key]);
        [postbody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
        [postbody appendData:[[body objectForKey:key] dataUsingEncoding:NSUTF8StringEncoding]];
        [postbody appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    }
   
   
    // close form
    [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:postbody];
   
   
    return request;
}
references:
http://stackoverflow.com/questions/4458112/mac-os-nsurlconnection-in-iteration