ios - NSOuputStream sends Old Value - Objective C -

i have created code used sockets send/receive value. did all. first time works well. face problem whenever send new value @ second time, old value passed. like, first time send 0 value socket, log file on socket side receive "0" in log file , received data sever, working well. when send value "2" socket, server socket receiving previous value "0" in log file. cant send new value.

my code

appdelegate.h

@property (strong) nsinputstream *inputstream; @property (strong) nsoutputstream *outputstream;  - (void) applicationddifinishlaunching....{ [self initnetworkcommunication:@"192.168.1.38"]; } 

appdelegate.m

- (void) initnetworkcommunication:(nsstring *) getip { nslog(@"getip = %@",getip); cfstringref acfstring = (__bridge cfstringref)getip;  cfreadstreamref readstream; cfwritestreamref writestream; cfstreamcreatepairwithsockettohost(null, acfstring, 1500, &readstream, &writestream); cfreadstreamsetproperty(readstream, kcfstreampropertyshouldclosenativesocket, kcfbooleantrue); cfwritestreamsetproperty(writestream, kcfstreampropertyshouldclosenativesocket, kcfbooleantrue);  nsinputstream *instream = (__bridge nsinputstream *) readstream; nsoutputstream *outstream = (__bridge nsoutputstream *) writestream;  [instream setdelegate:self]; [outstream setdelegate:self]; [instream scheduleinrunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode]; [outstream scheduleinrunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode]; [instream open]; [outstream open];  self.inputstream = instream; self.outputstream = outstream; [self performselectorinbackground:@selector(startdatatoserver:) withobject:@"0"]; }    - (void) startdatatoserver:(id) { nsstring *command = [nsstring stringwithformat:@"%@",get]; //nsdata *datafixed = [[command stringbyappendingstring:@"\r\n"] datausingencoding:nsutf8stringencoding]; nsmutabledata *data = (nsmutabledata *)[[command stringbyappendingstring:@"\r\n"] datausingencoding:nsutf8stringencoding]; unsigned long length = [data length];  uint8_t *readbytes = (uint8_t *) [data bytes]; uint8_t buffer[length]; (void)memcpy(buffer, readbytes, length); length = [outputstream write:(const uint8_t *)buffer maxlength:length]; if (-1 == length) {         nslog(@"error writing stream %@: %@", outputstream, [outputstream streamerror]); } else {         nslog(@"wrote %ld bytes stream %@.", (long)length, outputstream); } [self writelogfile:command typename:@"serverstart"]; }     - (void)stream:(nsstream *)thestream handleevent:(nsstreamevent)streamevent {  switch (streamevent) {     case nsstreameventopencompleted:     {         if ([thestream iskindofclass:[inputstream class]]) {             nslog(@"input stream opened");         } else {             nslog(@"output stream opened");         }         break;     }     case nsstreameventhasspaceavailable:         nslog(@"nsevethaspcape");         break;     case nsstreameventhasbytesavailable:         // listening server acknowledgement         nslog(@"nsstreameventhasbytesavailable");         if (thestream == inputstream) {         }         break;     case nsstreameventerroroccurred:          nslog(@"nsstreameventerroroccurred");         // when disconnect or error occured between socket & server         break;     case nsstreameventendencountered:         // occur when server closed         nslog(@"nsstreameventendencountered");         [thestream close];         [thestream removefromrunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode];         thestream = nil;         break;     default:         nslog(@"unknown event"); } } 

in windowcontroller.h

anobject = @"2";

-(void) loginconnectionprocess:(id)anobject {  appdelegate *appdelegate = (appdelegate *)[[nsapplication sharedapplication] delegate]; appdelegate.inputstream.delegate = self; appdelegate.outputstream.delegate = self;  nsstring *command = [nsstring stringwithformat:@"%@",anobject]; nsmutabledata *data = (nsmutabledata *)[[command stringbyappendingstring:@"\r\n"] datausingencoding:nsutf8stringencoding]; unsigned long length = [data length]; nslog(@"anojbe= %@",command); uint8_t *readbytes = (uint8_t *) [data bytes]; uint8_t buffer[length]; (void)memcpy(buffer, readbytes, length); length = [appdelegate.outputstream write:(const uint8_t *)buffer maxlength:length]; if (-1 == length) {     nslog(@"errors writing stream %@: %@", appdelegate.outputstream, [appdelegate.outputstream streamerror]); } else {     nslog(@"wrotes %ld bytes stream %@.", (long)length, appdelegate.outputstream); } }   - (void)stream:(nsstream *)thestream handleevent:(nsstreamevent)streamevent { switch (streamevent) {     case nsstreameventopencompleted:         nslog(@"connectionopened");         break;     case nsstreameventhasspaceavailable:         nslog(@"nsstreameventhasspaceavailable");         break;     case nsstreameventhasbytesavailable:     {         nslog(@"nsstreameventhasbytesavailable");         if (thestream == appdelegate.inputstream) {          }         break;     }     case nsstreameventerroroccurred:         break;     case nsstreameventendencountered:         [thestream close];         [thestream removefromrunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode];         thestream = nil;         break;     default:         nslog(@"unknown events"); } } 

and whenever called second time, stream "nsstreameventhasspaceavailable" function fired. "nsstreameventhasbytesavailable" function never called. missing/issue in here. waiting reply. help. in advance.

i called following code, flushed

nsstring *command = [nsstring stringwithformat:@"%@\r",username.stringvalue]; nsdata *data = [command datausingencoding:nsutf8stringencoding]; [outputstream write:[data bytes] maxlength:[data length]];