Weird socket/stream behaviour
Weird socket/stream behaviour
- Subject: Weird socket/stream behaviour
- From: Kenny Millar <email@hidden>
- Date: Thu, 5 Jan 2006 21:05:40 +0000
Hi again.
I have another issue with my new app that I hope someone can help me
with. (I'm new to cocoa so I'm pleased to have gotten even this far!)
The scene is this, I have a cocoa app which connects to a service
running on windows servers. (Windows Server 2003).
I have the service running on half a dozen or so servers. They are
all the same, on the same subnet, with the same software on them all.
My client (cocoa) app connects to just one server at a time.
The weird behaviour is that it can connect to about half of the
servers and communicate back/forth with them no trouble at all.
On the other half of the machines, I get a NSStreamEventErrorOccurred
in my stream handleEvent: method immediately that I attempt the
connection.
When I query the stream error using :-
NSError* er = [stream streamError];
NSLog(@"Stream Event Error x, %@",stream,[stream streamError]);
Produces :-
... NSError "Error NSUnknownErrorDomain 7"
Domain=NSUnknownErrorDomain Code=7
But, if I use 'telnet' from the same mac to one of the 'non working'
windows servers, then I can manually chat with the server with no
trouble at all. This suggests to me that the problem lies in my cocoa
connection code. It has to be my cocoa code since telnet works.
One final point, it's always the same machines that work and the same
ones that don't work. (But telnet works to/from all machines with no
problems.)
I've posted my 'connect to server' code below.
Thanks for any help...
-KennyM.
The connect code:-
- (IBAction)connectServer:(id)sender
{
int nPort=41000;
NSString *serverAddr = [serversComboBox stringValue];
// if no server, then nothing to do.
if ([serverAddr length] == 0)
{
[infoText setString:@"No server address supplied.\n"];
NSRunAlertPanel(@"Can't connect",@"No server address supplied.\nYou
need to supply the address of a SCOPE Server.",@"OK",nil,nil);
return;
}
if ([serverPort intValue] != 0)
nPort = [serverPort intValue];
// Do the user feedback
[connectSpinner startAnimation:self];
[disconBut setEnabled:TRUE];
[connectBut setEnabled:FALSE];
NSString *str = [NSString stringWithFormat:@"Connecting to: %@:%d
\n",serverAddr,nPort];
[infoText insertText:str];
// start the timeout timer
tickCounts=0;
timer = [[NSTimer scheduledTimerWithTimeInterval:1 target:self
selector:@selector(timerTick:)
userInfo:nil repeats:YES] retain];
// reset the boolean
bConnected = FALSE;
//attempt the connection
[NSStream getStreamsToHost:[NSHost hostWithName:serverAddr] port:
41000 inputStream:&iStream outputStream:&oStream];
if((!iStream) || (!oStream))
{
[self disconnectServer:nil];
[infoText insertText:@"Could not connect.\n"];
NSRunAlertPanel(@"Can't connect",@"Could not connect to the
server.",@"OK",nil,nil);
return;
}
[iStream retain];
[oStream retain];
NSLog(@"iStream:x, oStream:x\n",iStream,oStream);
[iStream setDelegate:self];
[oStream setDelegate:self];
[iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[oStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[iStream open];
[oStream open];
}
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