nsinputstream

I need a Cocoa class that can read and write from a memory stream and that supports seeking. In C#, MemoryStream supports the method seek , and in Java, ByteArrayInputStream supports the methods mark , skip , and reset . In iOS development, what are the equivalent class and method? I need the above functionality for my project, and if it is by default not supported by the iOS frameworks, what would be the best way of going about implementing my own? E.g. write my own stream subclass inheriting from NSInputStream / NSOutputStream which will internally contain custom code? An arbitrary

Previously in iOS7 when we try to upload with stream request in background we get following exception Terminating app due to uncaught exception 'NSGenericException', reason: 'Upload tasks in background sessions must be from a file' But in iOS8 there is no exception when we try to upload with stream in background. Now my question is 1) Is backgourd upload with uploadTaskWithStreamedRequest: allowed in iOS8? 2) In iOS8 i am using background NSURLConfiguration with uploadTaskWithStreamedRequest . I am using -(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task needNewBodyStream:

I have the following code in Objective-C: - (double)readDouble { double value = 0.0; if ([self read:(uint8_t *)&value maxLength:8] != 8) { NSLog(@"***** Couldn't read double"); } return value; } It works. But I don't know how to convert it to Swift. Here is my code: public func readDouble() -> Double { var value : Double = 0.0 var num = self.read((uint8_t *)&value, maxLength:8) // got compiling error here! if num != 8 { } } The error message is: Cannot invoke '&' with an argument list of type '($T4, maxLength: IntegerLiteralConvertible)' Can anybody help? Thanks The testing data I'm using (1

I use an NSInputStream to read data from a file. It will crash if maxLength is greater than 49152. When it crashes -- sometimes, but not every time, it gives this message: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSConcreteData initWithBytes:length:copy:freeWhenDone:bytesAreVM:]: absurd length: 4294967295, maximum size: 2147483648 bytes' From my calculation, 524288 is still less than that maximum, and can fit in the return value. What did I miss? - (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode { switch (eventCode) { case

Update: When using NSXMLParser class method initWithContentsOfURL , rather than parsing as the XML feed is downloaded, it appears to try to load the entire XML file into memory, and only then initiate the parsing process. This is problematic if the XML feed is large (using an excessive amount of RAM, inherently inefficient because rather than parsing in parallel with the download, it only starts the parsing once the download is done, etc.). Has anyone discovered how to parse as the feed is being streamed to the device using NSXMLParser ? Yes, you can use LibXML2 (as discussed below), but it

(UPDATED) this is the problem in a nutshell: in iOS I want to read a large file, do some processing on it (in this particular case encode as Base64 string() and save to a temp file on the device. I set up an NSInputStream to read from a file, then in (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode I'm doing most of the work. For some reason, sometimes I can see the NSInputStream just stops working. I know because I have a line NSLog(@"stream %@ got event %x", stream, (unsigned)eventCode); in the beginning of (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent