waitForDataInBackgroundAndNotifyForModes:
Asynchronously checks to see if data is available.
- (void)waitForDataInBackgroundAndNotifyForModes:(NSArray *)modes
Parameters
- modes
- The runloop modes in which the data available notification can be posted.
Discussion of [NSFileHandle waitForDataInBackgroundAndNotifyForModes]
When the data becomes available, this method posts a
NSFileHandleDataAvailableNotification notification on the current thread. This method differs from waitForDataInBackgroundAndNotify in that modes specifies the run-loop mode (or modes) in which NSFileHandleDataAvailableNotification can be posted. [NSFileHandle waitForDataInBackgroundAndNotifyForModes]
You must call this method from a thread that has an active run loop.
Example of [NSFileHandle waitForDataInBackgroundAndNotifyForModes]
-(void) errorData: (NSNotification *) notification
{
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];
NSData *data = [fileHandle availableData];
if ([data length]) {
// consume data
// ...
[fileHandle waitForDataInBackgroundAndNotifyForModes:[NSArray arrayWithObject:NSDefaultRunLoopMode]];
} else {
// EOF was hit, remove observer
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSFileHandleDataAvailableNotification object:fileHandle];
}
}
