I think I understand what you’re trying to do. You want to send a .txt file to the client without actually creating a file on disc. This is actually pretty basic, and extremely easy. All you have to do is set your MIME type in the header, however most browsers don’t download .txt files by … Read more
Python file objects provide iterators, which will read line by line. file.readlines() reads them all and returns a list – which means it needs to read everything into memory. The better approach (which should always be preferred over readlines()) is to just loop over the object itself, E.g: import zipfile with zipfile.ZipFile(…) as z: with … Read more
Given: Stream<String> stream = new Stream<String>.fromIterable([‘mene’, ‘mene’, ‘tekel’, ‘parsin’]); then: print(‘BEFORE’); stream.listen((s) { print(s); }); print(‘AFTER’); yields: BEFORE AFTER mene mene tekel parsin whereas: print(‘BEFORE’); await for(String s in stream) { print(s); } print(‘AFTER’); yields: BEFORE mene mene tekel parsin AFTER stream.listen() sets up code that will be put on the event queue when an … Read more
I had the same problem. The first thought was to implement a LazyString class, which acts like a string but only reading as much data from the stream as currently needed (I did this by reimplementing __getitem__ and __iter__ to fetch and buffer characters up to the highest position accessed…). This didn’t work out (I … Read more
It’s interesting that though the question might seem reasonable, it’s not that easy to figure out a practical reason why I would need to convert a StringIO into a BytesIO. Both are basically buffers and you usually need only one of them to make some additional manipulations either with the bytes or with the text. … Read more
WriteTo() is resetting the read position to zero before copying the data – CopyTo() on the other hand will copy whatever data remains after the current position in the stream. That means if you did not reset the position yourself, no data will be read at all. Most likely you just miss the following in … Read more
Not part of STL but well known library is boost. I would go the way of using boost::date. Here are some examples: http://www.boost.org/doc/libs/1_55_0/doc/html/date_time/date_time_io.html#date_time.io_tutorial. If you did not try out boost yet I encourage you to do so as it saves you from a lot of nasty issues, as it masks most OS dependent things like … Read more
Stream.Length only works on Stream implementations where seeking is available. You can usually check to see if Stream.CanSeek is true. Many streams, since they’re being streamed, are of a nature where it’s impossible to know the length in advance. If you must know the length, you may need to actually buffer the entire stream, loading … Read more
You can nest StreamBuilder if needed. Nothing prevents you from doing the following: StreamBuilder( stream: stream1, builder: (context, snapshot1) { return StreamBuilder( stream: stream2, builder: (context, snapshot2) { // do some stuff with both streams here }, ); }, ) Another solution if this makes sense for you is: Streams are designed to be mergeable/transformed. … Read more
Also if you’re using Java 7, you can use a try-with-resources statement: try(BufferedReader r = new BufferedReader(new InputStreamReader(address.openStream()))) { String inLine; while ((inLine = r.readLine()) != null) { System.out.println(inLine); } } catch(IOException readException) { readException.printStackTrace(); }