Calculating File size before download

Question

Ok ! Coming to the point directly. What I want to do is explained as follows.

• I have an url of MP3 file. ( for example Sound File )
• Now, When user starts application.

• Download should start & for that I have implemented following methods.

  -(void)viewDidLoad {
  [super viewDidLoad];
  NSURL *url=[NSURL URLWithString:@"http://xyz.pqr.com/abc.mp3"];
  NSURLRequest *req=[NSURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:120];
  
  
  NSURLConnection *con=[[NSURLConnection alloc] initWithRequest:req delegate:self startImmediately:YES];
  
  
  if(con){
      myWebData=[[NSMutableData data] retain];
      } else {
      //          [MainHandler performSelector:@selector(targetSelector:) withObject:nil];
    } 
   }
  

  -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

  NSLog(@"%@",@"connection established");
  [myWebData setLength: 0];
  

  }

  -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { NSLog(@"%@",@"connection receiving data"); [myWebData appendData:data]; }

  -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"%@",@"connection failed"); [connection release]; // [AlertViewHandler showAlertWithErrorMessage:@"Sorry, there is no network connection. Please check your network and try again."]; // [self parserDidEndDocument:nil]; }

  -(void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; }

• Now, Above methods work perfectly for downloading. But missing points are as follows.

  • I can not get the exact size which is going to be downloaded.

( means I want to know what is the size of file - which is going to be download )

Answer 1

Yep ! Almost done with ASIHTTP.

-(IBAction)btnTapped:(id)sender {
    NSURL *url = [NSURL URLWithString:@"http://sound20.mp3pk.com/indian/omkara/omkara1%28songs.pk%29.mp3"];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDownloadDestinationPath:[self pathForLogInCCID]];
    [myProgressIndicator setProgress:0];

    [request setDownloadProgressDelegate:myProgressIndicator];
    [request startSynchronous];
[myProgressIndicator doubleValue]);

    [request setDelegate:self];
    [request startAsynchronous];
}


- (void)requestFinished:(ASIHTTPRequest *)request
{
    // Use when fetching text data
//  NSString *responseString = [request responseString];

    // Use when fetching binary data
//  NSData *responseData = [request responseData];
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
//  NSError *error = [request error];
}

-(NSString*)pathForLogInCCID{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *DataPath = [documentsDirectory stringByAppendingPathComponent:@"mySong.png"];
    return DataPath;
}

Answer 2

Just use the expectedContentSize on the NSURLResponse object which is passed to the following delegate methods:

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

}
-(NSURLRequest *)connection:(NSURLConnection *)connection
        willSendRequest:(NSURLRequest *)request
       redirectResponse:(NSURLResponse *)response {
}

like this:

long long size = [response expectedContentLength];