iOS send data using socket connection - ios

Question

I have implemented socket connection in iOS.
What I want to do is to send string of data to the connected device...
(I am able to receive data when someone sends to my device)
I have tried this code but data is getting received on other device, when I close my app.
- (IBAction)connectToServer:(id)sender {
NSLog(#"Setting up connection to %# : %i", _ipAddressText.text, [_portText.text intValue]);
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, (__bridge CFStringRef) _ipAddressText.text, [_portText.text intValue], &readStream, &writeStream);
messages = [[NSMutableArray alloc] init];
[self open];
}
- (void)open {
NSLog(#"Opening streams.");
outputStream = (__bridge NSOutputStream *)writeStream;
inputStream = (__bridge NSInputStream *)readStream;
[outputStream setDelegate:self];
[inputStream setDelegate:self];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream open];
[inputStream open];
_connectedLabel.text = #"Connected";
}
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSLog(#"stream event %lu", streamEvent);
switch (streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(#"Stream opened");
_connectedLabel.text = #"Connected";
break;
case NSStreamEventHasBytesAvailable:
if (theStream == inputStream)
{
uint8_t buffer[1024];
NSInteger len;
while ([inputStream hasBytesAvailable])
{
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if (len > 0)
{
NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
if (nil != output)
{
NSLog(#"server said: %#", output);
[self messageReceived:output];
}
}
}
}
break;
case NSStreamEventHasSpaceAvailable:
NSLog(#"Stream has space available now");
break;
case NSStreamEventErrorOccurred:
NSLog(#"error: %#",[theStream streamError].localizedDescription);
break;
case NSStreamEventEndEncountered:
[theStream close];
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
_connectedLabel.text = #"Disconnected";
NSLog(#"close stream");
break;
default:
NSLog(#"Unknown event");
}
}
/* Sends data to other device */
- (IBAction) sendMessage {
NSLog(#"sendMessage");
NSString *response = [NSString stringWithFormat:#"msg:%#", _dataToSendText.text];
NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
NSLog(#"[data length] %lu",(unsigned long)[data length]);
[outputStream write:[data bytes] maxLength:[data length]];
}
Where I am making mistake?

Answer 1

After doing hard research i found adding \n at the end of string message indicates my buffer has received whole string.
now start sending a file, so it worked...
To send a String over Sockets, you must mark the end of the string. ie; Add a \n

Answer 2

To mark a string with start and end of string there are ASCII control characters to do so, the octets are \002 & \003 respectively. I would recommend using these control characters instead of just adding a line break, your text could have line breaks and that could create problems.