waitForDataInBackgroundAndNotify
Asynchronously checks to see if data is available.
- (void)waitForDataInBackgroundAndNotify
Discussion
When the data becomes available, this method posts a
NSFileHandleDataAvailableNotification notification on the current thread.[NSFileHandle waitForDataInBackgroundAndNotify]
You must call this method from a thread that has an active run loop.
Example of [NSFileHandle waitForDataInBackgroundAndNotify]
/** * Fired whenever new data becomes available on STDERR * * @private */ -(void) errorData: (NSNotification *) notification { NSFileHandle *fileHandle = (NSFileHandle*) [notification object]; NSData *data = [fileHandle availableData]; if ([data length]) { // consume data // ... [fileHandle waitForDataInBackgroundAndNotify]; } else { // EOF was hit, remove observer [[NSNotificationCenter defaultCenter] removeObserver:self name:NSFileHandleDataAvailableNotification object:fileHandle]; } }
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-(void) outData: (NSNotification *) notification
{
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];
NSData *data = [fileHandle availableData];
if ([data length]) {
NSString *currentString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// do something
}
[fileHandle waitForDataInBackgroundAndNotify]; //Checks to see if data is available in a background thread.
}
-(void) errData: (NSNotification *) notification
{
NSLog(@"errData");
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];
[fileHandle waitForDataInBackgroundAndNotify];
}
