socket programming in objective c - iphone

Question

I have an app that uses socket
In my application , i am trying to establish socket connection and after connecting socket i need to send soap request to server.i'm having problem with soap request sending to server. i have attached the code. Please help me in this
BOOL status;
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
urlString = #"hoegamestg.hogaming.info";
// urlString = #"247liveagent.hointeractive.com";
if (![urlString isEqualToString:#""])
{
NSURL *website = [NSURL URLWithString:urlString];
if (!website)
{
NSLog(#"%# is not a valid URL", urlString);
status = NO;
}
else
{
NSLog(#"URL IS VALID%#",website );
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef) [website host], 5654, &readStream, &writeStream);
// CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef) urlString, 5654, &readStream, &writeStream);
//USE TOLL-FREE BRIDGING FOR CONVERTING CORE-FOUNDATION STREAMS TO NSSTREAMS.
self.inputStream = (__bridge_transfer NSInputStream *)readStream;
self.outputStream = (__bridge_transfer NSOutputStream *)writeStream;
//SET DELEGATES TO STREAMS.
[self.inputStream setDelegate:self];
[self.outputStream setDelegate:self];
//AVOID BLOCKING OPERATIONS BY SCHEDULING THEM ON TO RUN LOOPS.
[self.inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[self.outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
//FINALLY OPEN THE STREAMS.
[self.inputStream open];
[self.outputStream open];
}
}......
Delegate method and soap request
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode{
// Start Logging events.
// NSString *str = [NSString stringWithFormat:#"%d",eventCode];
// NSMutableString *subscribeTableString;
NSData *data;
NSString *soapMessage = [[NSString alloc]init];
switch (eventCode) {
case NSStreamEventNone:
NSLog(#"NSStreamEventNone");
break;
case NSStreamEventOpenCompleted:
NSLog(#"NSStreamEventOpenCompleted");
break;
case NSStreamEventHasBytesAvailable:
NSLog(#"NSStreamEventHasBytesAvailable");
[self readDataFromStream];
break;
case NSStreamEventHasSpaceAvailable:
NSLog(#"NSStreamEventHasSpaceAvailable");
soapMessage=[soapMessage stringByAppendingString:[NSString stringWithFormat:#"<subscribe channel=\"table-bc7ire5oi4uhetfd\" ><player id=\"%#\" />",socketValue ]];
// soapMessage=[soapMessage stringByAppendingString:[NSString stringWithFormat:#"<subscribe channel=\"table-bc7ire5oi4uhetfd\" ><player id= \"c2da1a80c52542dd\" />" ]];
soapMessage =[soapMessage stringByAppendingString:[NSString stringWithFormat:#"<sessionid id=\"%#\"",socketname]];
soapMessage =[soapMessage stringByAppendingString:[NSString stringWithFormat:#"></sessionid></subscribe>"]];
NSLog(#"THE STRING IS : %#", soapMessage);
data = [[NSData alloc] initWithData:[soapMessage dataUsingEncoding:NSASCIIStringEncoding]];
[self.outputStream write:[data bytes] maxLength:[data length]];
NSLog(#"THE STRING IS : %#", self.outputStream);
[self setMWriteData:[NSData dataWithBytes:(__bridge const void*)soapMessage length:
[soapMessage length]]];
[self writeDataToStream];
// <subscribe channel="table-l8i2hq4jo2hjj9ca"><player id="b82fe3c52020494b" /><sessionid id="246421321cc873d080b550bcc555de0e9d9d29d8cba6f243ec56d38c5785"></sessionid></subscribe>
break;
case NSStreamEventErrorOccurred:
NSLog(#"NSStreamEventErrorOccurred");
NSLog(#"THE ERROR IS : %#", [aStream streamError]);
break;
case NSStreamEventEndEncountered:
break;
default:
break;
}
}

Answer 1

If I'm not mistaken, SOAP is based on the HTTP protocol, so you cannot use raw sockets for that. You can refer to this question if you do need SOAP: how to send/recieve soap object with objective c for ipad
However, if you meant simply sending XML over raw sockets, then you'll need to tell the receiver when to stop reading.
HTTP's way of ending streams is adding \r\n\r\n to the end of the string, so you can use that.
Another way is sending a 4 byte header with the amount of bytes to be sent, so add this (untested):
int s = [data length];
NSData *size = [NSData dataWithBytes:&s length:4];
[self.outputStream write:[size bytes] maxLength:[size length]];
before this
[self.outputStream write:[data bytes] maxLength:[data length]];
The server needs to be aware of this and treat every first 4 bytes as the header, and then reading the amount of bytes mentioned in the header.
I think it would be easier to use HTTP's method with the server stopping its reading when it encounters \r\n\r\n