Getting negative value(-1) when Byte write over server through socket programming in MAC OSX
case NSStreamEventHasSpaceAvailable:

           - - - - -  - -
           - - -  - - -  -
          --- - -  - -  --

        NSInteger   bytesWritten;
        bytesWritten = [self.oStream write:[self.data5 bytes] maxLength:[self.data5 length]];
        if (bytesWritten <= 0) {

            NSLog(@"No Byte written");
        } else {
           NSLog(@" Byte written");
            [self.data5 replaceBytesInRange:NSMakeRange(0, bytesWritten) withBytes:NULL length:0];
            space = YES;
        }

case NSStreamEventHasBytesAvailable:

NSLog(@"Bytes available");


            NSInteger   bytesRead;
            NSUInteger  bufferLength;

            bufferLength = [ inputBuffer length];
            if (bufferLength == self.inputBufferCapacity) {
                NSLog(@"Error");
            } else {
                // Temporarily increase the size of the buffer up to its capacity
                // so as to give us a space to read data.

                [self.inputBuffer setLength:self.inputBufferCapacity];

                // Read the actual data and respond to the three types of return values.

                bytesRead = [iStream read:((uint8_t *) [self.inputBuffer mutableBytes]) + bufferLength maxLength:self.inputBufferCapacity - bufferLength];

NSError* anError = [iStream streamError];
NSLog(@"Error = %@", anError);