Named Pipes using mkfifo and Cocoa

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Named Pipes using mkfifo and Cocoa

I have a C++ application that uses named pipes by calling mkfifo and I would like to use them to connect to a Cocoa app. I have taken a look at NSPipe but there isn't an option to connect to a named pipe. Does anyone know how to connect NSPipes or something else I can tie into the NSNotificationCenter that can talk to named pipes?

Thank you for your time,

Tom

Mac Pro, Mac OS X (10.5.4)

Posted on Aug 21, 2008 6:32 PM

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Answer 1

tdesrochers Author

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Aug 22, 2008 2:21 PM in response to tdesrochers

-(void)SomeFunc
{
const char * path = "/tmp/tom21";
if(mkfifo(path, 0666) == -1 && errno !=EEXIST){
NSLog(@"Unable to open the named pipe %c", path);
}

NSFileHandle * filehandleForReading;
int fd = open(path, O_RDWR | O_NDELAY);
filehandleForReading = [[NSFileHandle alloc] initWithFileDescriptor:fd closeOnDealloc: YES];

NSNotificationCenter *nc;
nc = [NSNotificationCenter defaultCenter];
[nc removeObserver:self];
[nc addObserver:self
selector:@selector(dataReady:)
name:NSFileHandleReadCompletionNotification
object:filehandleForReading];
[filehandleForReading readInBackgroundAndNotify];
}

And then here is the func that gets called by the Notification server

- (void)dataReady:(NSNotification *)n
{
NSData *d;
d = [[n userInfo] valueForKey:NSFileHandleNotificationDataItem];

NSLog(@"dataReady:%d bytes", [d length]);

if ([d length]) {
[self appendData:d];
}

//Tell the fileHandler to asychronusly report back
[filehandleForReading readInBackgroundAndNotify];
}

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