Hello. I have an application with different tabs. Tab Setting has a textfield where a TCP-IP address of the server can be inserted. It also has a switch turning on and off TCP-IP connection. The code is:
In the second ViewPanel, I have another switch that turns on a timer to call the sendMapMessageToServer every 5 seconds:
So, when I do it, I see the message "MAPPING SECOND MESSAGE SENT". So, the method is called, however for some reason, the message is not sent to the server. When I trigger sending the message from the same tab (class) it seems to work, so there should not be any problem with the server.
I am stuck.
Thank you!
Code:
- (IBAction)connectToNetwork:(UISwitch *)sender {
if(self.switchNetworkConnection.on) {
// Connection with the server
[self initNetworkCommunication];
appDelegate.isConnectionAvailableDelegate = YES;
}
else {
// Disconnect from server
[self closeNetworkCommunication];
appDelegate.isConnectionAvailableDelegate = NO;
}
}
// Initiate network communication.
- (void)initNetworkCommunication {
// IP Address and port
NSString *ipAddressString = appDelegate.ipAddressDelegate;
// Transfer NSString to CFStringRef
CFStringRef ipAddress = (__bridge CFStringRef)ipAddressString;
UInt32 ipPortInt = [appDelegate.ipPortDelegate intValue];
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)ipAddress, ipPortInt, &readStream, &writeStream);
inputStream = objc_unretainedObject(readStream);
outputStream = objc_unretainedObject(writeStream);
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
NSLog(@"ACARS communication initiated");
}
// Close network communication.
- (void)closeNetworkCommunication {
[inputStream close];
[outputStream close];
[inputStream removeFromRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[outputStream removeFromRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[inputStream setDelegate:nil];
[outputStream setDelegate:nil];
inputStream = nil;
outputStream = nil;
NSLog(@"ACARS communication closed");
}
// Stream
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSLog(@"stream event %i", streamEvent);
switch (streamEvent)
{
case NSStreamEventNone:
{
NSLog(@"NSStreamEventNone");
}
break;
case NSStreamEventOpenCompleted:
{
NSLog(@"NSStreamEventOpenCompleted");
}
break;
case NSStreamEventHasBytesAvailable:
{
NSLog(@"NSStreamEventHasBytesAvailable");
if (theStream == inputStream)
{
uint8_t buffer[1024];
int len;
while ([inputStream hasBytesAvailable])
{
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if (len > 0)
{
NSMutableString *output = [[NSMutableString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding];
// Implement a method that reads the message sent from the server
[self messageReceived:output];
}
}
}
appDelegate.isConnectionAvailableDelegate = YES;
}
break;
case NSStreamEventErrorOccurred:
{
NSLog(@"NSStreamEventErrorOccurred");
//Connection switch back to off
[self.switchNetworkConnection setOn:NO animated:YES];
// Disconnect from server
[self closeNetworkCommunication];
// Stop activity indicator
//[self.activityIndicator stopAnimating];
// Pop-up message that the address is not valid
UIAlertView* disconnectMsg;
disconnectMsg = [[UIAlertView alloc] initWithTitle:@"No Connection with Server"
message:@"No connection."
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil, nil];
[disconnectMsg show];
appDelegate.isConnectionAvailableDelegate = NO;
}
break;
case NSStreamEventEndEncountered:
{
NSLog(@"NSStreamEventEndEncountered");
[theStream close];
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
theStream = nil;
appDelegate.isConnectionAvailableDelegate = NO;
}
break;
default:
{
NSLog(@"Unknown event");
}
break;
}
}
// Messages that are received from the server.
- (void) messageReceived:(NSString *)message {
NSLog(@"MAP MESSAGE RECEIVED: %@",message);
}
// Messages that contain the code sent to the server. As a result the server will reply with data
- (void)sendMapMessageToServer {
NSString *response = [NSString stringWithFormat:@"MESSAGE_TO_SERVER:"];
NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
[outputStream write:[data bytes] maxLength:[data length]];
NSLog(@"MAPPING SECOND MESSAGE SENT");
}In the second ViewPanel, I have another switch that turns on a timer to call the sendMapMessageToServer every 5 seconds:
Code:
- (IBAction)connectToServer:(UISwitch *)sender {
if(self.switchConnection.on) {
// Setting timer at 5 sec by default
connectionTimer = [NSTimer scheduledTimerWithTimeInterval: 5.0
target: self
selector: @selector(loadDataToServer)
userInfo: nil
repeats: YES];
}
else {
// Stop timer
[connectionTimer invalidate];
connectionTimer = nil;
}
}
-(void) loadDataToServer {
NSLog(@"LOADINGDATATOTHEMAP");
self.settingVC = [[IGASettingsViewController alloc]init];
[self.settingVC sendMapMessageToServer];
}So, when I do it, I see the message "MAPPING SECOND MESSAGE SENT". So, the method is called, however for some reason, the message is not sent to the server. When I trigger sending the message from the same tab (class) it seems to work, so there should not be any problem with the server.
I am stuck.
Thank you!
