NSOuputStream writing multiple times

Question

Hello,

I'm trying to use the NSStream objects to open and then write and read on a socket but i have a problem.

I don't know how to write on the socket, after i have opened it.

Here is how i have done

1) first openning the socket :

 NSURL *website = [NSURL URLWithString:urlStr]; 
        if (!website) { 
            NSLog(@"%@ is not a valid URL"); 
            return; 
        } 
        NSHost *host = [NSHost hostWithName:urlStr]; 
        // iStream and oStream are instance variables 
        [NSStream getStreamsToHost:host port:6667 inputStream:&iStream 
          outputStream:&oStream]; 
        [iStream retain]; 
        [oStream retain]; 
        [iStream setDelegate:self]; 
        [oStream setDelegate:self]; 
        [iStream scheduleInRunLoop:[NSRunLoop currentRunLoop] 
            forMode:NSDefaultRunLoopMode]; 
        [oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] 
            forMode:NSDefaultRunLoopMode]; 
        [iStream open]; 
        [oStream open];

2) Set the loop :

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
{
    NSString *io;

    if (theStream == iStream) io = @">>";
    else io = @"<<";
    NSLog(@"stream : %@",theStream);

    NSString *event;
    switch (streamEvent)
    {
     case NSStreamEventNone:
      event = @"NSStreamEventNone";
      break;
     case NSStreamEventOpenCompleted:
      event = @"NSStreamEventOpenCompleted";
      break;
     case NSStreamEventHasBytesAvailable:{
      event = @"NSStreamEventHasBytesAvailables";
      if (theStream == iStream)
      {
       if(!_data) { 
        _data = [[NSMutableData data] retain]; 
       } 
       uint8_t buf[1024]; 
       unsigned int len = 0; 
       len = [iStream read:buf maxLength:1024]; 
       NSLog(@"Lenght data read : %d", len);
       if(len) { 
        NSData * dataReceived= [[NSString stringWithFormat:@"%s\n", (char *)buf] dataUsingEncoding:NSUTF8StringEncoding];
        NSString *s = [[NSString alloc] initWithData:dataReceived encoding:NSUTF8StringEncoding];
        NSLog(@"Received _data: \"%@\"\n",s);



       } else { 
        NSLog(@"nothing to read!"); 
       } 
      }else {
       NSLog(@"Not the good stream");
      }

            break;
     }

     case NSStreamEventHasSpaceAvailable:{
      event = @"NSStreamEventHasSpaceAvailable";
      if (theStream == oStream )
      {
       if(isConnexionCommandSent == NO){
        [self sendCommand:@"My connection command"]; 
        isConnexionCommandSent = YES;
       }

      }

      break;
     }

     case NSStreamEventErrorOccurred:
      event = @"NSStreamEventErrorOccurred";
      NSError *theError = [theStream streamError]; 
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[theError localizedDescription]
                    delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
      [alert show];
      [alert release];
      break;
     case NSStreamEventEndEncountered:
      event = @"NSStreamEventEndEncountered";

      break;
     default:
      event = @"** Unknown";
    }

    NSLog(@"%@ : %@", io, event);
}

3) then i have a function that is called when I touch a button

- (IBAction)join:(id)sender{
    if([oStream hasSpaceAvailable]){
     NSLog(@"iStream Status : %d",[iStream streamStatus]);
     NSLog(@"oStream Status : %d",[oStream streamStatus]);
     [self sendCommand:@"join"];

    }else{
     NSLog(@"Error command can't be sent");  
    }
}

-(void) sendCommand:(NSString *) command{
    NSLog(@"space : %d",[oStream hasSpaceAvailable]);
    if ([oStream hasSpaceAvailable])
    {
     NSLog(@"Command writen : %s\n",[command cStringUsingEncoding:NSASCIIStringEncoding]);
     NSInteger i=[oStream write:(const uint8_t *)[command cStringUsingEncoding:NSASCIIStringEncoding] maxLength:(NSInteger)[command lengthOfBytesUsingEncoding:NSASCIIStringEncoding]];
     if (i<0)
     {
      NSLog(@"erreur lors de l'envoi, status:%i, erreur:%@", [oStream streamStatus], [oStream streamError]);
     }
     isReadyToSend = NO;
    }

    else
    {
     NSLog(@"impossible d'envoyer, status:%i, erreur:%@", [oStream streamStatus], [oStream streamError]);
    }
}

But the problem is that when the function join is called, everything goes fine, but the server receives nothing ...

On

NSInteger i=[oStream write:(const uint8_t *)[command cStringUsingEncoding:NSASCIIStringEncoding] maxLength:(NSInteger)[command lengthOfBytesUsingEncoding:NSASCIIStringEncoding]];

i is > 0, so i assume that the writing went well, but on the server nothing is received ... i don't know why ...

Can you help me?