NSOuputStream writing multiple times - objective-c

Question

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?

Answer 1

Hey #Ptitaw see this post. I believe there you might find your answer and an easier way to connect and get access automatically to all events (reading, writing, etc..)
Hope I could help :)

Answer 2

A Very very late answer, however, it might be helpful to someone having similar issue.
I think it may be due to data encoding mechanism. Your server might be using UTF-8 encoding and you are sending your data using NSASCIIStringEncoding. Try this:
NSInteger i=[oStream write:(const uint8_t *)[command cStringUsingEncoding:NSUTF8StringEncoding] maxLength:(NSInteger)[command lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];