NSFileHandle readToEndOfFileInBackgroundAndNotify example ios

readToEndOfFileInBackgroundAndNotify

Reads to the end of file from the file or communications channel in the background and posts a notification when finished.

- (void)readToEndOfFileInBackgroundAndNotify

Discussion

This method performs an asynchronous readToEndOfFile operation on a file or communications channel and posts anNSFileHandleReadToEndOfFileCompletionNotification. You must call this method from a thread that has an active run loop.[NSFileHandle readToEndOfFileInBackgroundAndNotify]

The notification includes a userInfo dictionary that contains the data read; access this object using the NSFileHandleNotificationDataItem key.[NSFileHandle readToEndOfFileInBackgroundAndNotify]

Any object interested in receiving this data asynchronously must add itself as an observer of NSFileHandleReadToEndOfFileCompletionNotification. In communication via stream-type sockets, the receiver is often the object returned in the userInfo dictionary of NSFileHandleConnectionAcceptedNotification.

Example of [NSFileHandle readToEndOfFileInBackgroundAndNotify]

- (void)awakeFromNib
{
    NSFileHandle *remoteConnection = [NSFileHandle
fileHandleForReadingAtPath:@"/Users/user/Desktop/file.plist"];

    [[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(readAllTheData:)
name:NSFileHandleReadToEndOfFileCompletionNotification
object:remoteConnection];
    [remoteConnection readToEndOfFileInBackgroundAndNotify];

}

- (void)readAllTheData:(NSNotification *)note {
    NSString *errors = nil;
    NSData *contentsOfDockFile = [note object];
    NSLog(@"%@", contentsOfDockFile);
    NSDictionary *testing = [NSPropertyListSerialization
propertyListFromData:contentsOfDockFile
mutabilityOption:NSPropertyListImmutable format:nil
errorDescription:&errors];
    NSLog(@"%@", testing);

    [[NSNotificationCenter defaultCenter] removeObserver:self
name:NSFileHandleReadToEndOfFileCompletionNotification object:[note
object]];

    [testing release];
}