stream - w3toppers.com

Getting an array of bytes out of Windows::Storage::Streams::IBuffer

You can use IBufferByteAccess, through exotic COM casts: byte* GetPointerToPixelData(IBuffer^ buffer) { // Cast to Object^, then to its underlying IInspectable interface. Object^ obj = buffer; ComPtr<IInspectable> insp(reinterpret_cast<IInspectable*>(obj)); // Query the IBufferByteAccess interface. ComPtr<IBufferByteAccess> bufferByteAccess; ThrowIfFailed(insp.As(&bufferByteAccess)); // Retrieve the buffer data. byte* pixels = nullptr; ThrowIfFailed(bufferByteAccess->Buffer(&pixels)); return pixels; } Code sample copied from http://cm-bloggers.blogspot.fi/2012/09/accessing-image-pixel-data-in-ccx.html

Performance Difference Between C and C++ Style File IO

You’re using endl to print a newline. That is the problem here, as it does more than just printing a newline — endl also flushes the buffer which is an expensive operation (if you do that in each iteration). Use \n if you mean so: file << i << ‘\n’; And also, must compile your … Read more

What is copyWith and how can I use it in Flutter and what are it’s use cases?

Let’s say you have an object in which you want to change some properties. One way to do is by changing each property at a time like object.prop1 = x object.prop2 = y and so on. This will go cumbersome if you have more than few properties to change. Then copyWith method comes handy. This … Read more

Using ServletOutputStream to write very large files in a Java servlet without memory issues

The average decent servletcontainer itself flushes the stream by default every ~2KB. You should really not have the need to explicitly call flush() on the OutputStream of the HttpServletResponse at intervals when sequentially streaming data from the one and same source. In for example Tomcat (and Websphere!) this is configureable as bufferSize attribute of the … Read more

Process a continuous stream of JSON

This sort of thing is best done using WebSockets now, which according to CanIUse.Com is available in all major browsers except Opera Mini (see that link for more details about older or all browsers, and click the Resources tab to see even more links). As an overview, websockets are supported in IE 10+, Edge 12+, … Read more

When will an EOFException occur in JAVA’s streams

The key word is unexpected. If you use DataInputStream and read a 4 byte integer but there were only 3 bytes remaining in the stream you’ll get an EOFException. But if you call read() at the end of stream you’ll just get -1 back and no exception.

OpenCV cv::Mat to std::ifstream for base64 encoding

In order to be able to send an image via HTTP, you also need to encode its width, height and type. You need to serialize the Mat into a stream and encode that stream with libb64. On the other side you need to decode that stream and deserialize the image to retrieve it. I implemented … Read more

Firestore collection query as stream in flutter

How to stream mp3 using pure Java

As Mario says, JMF – Java Media Framework is a good starting point. What Mario does not say is that Sun killed MP3 support since 2.1.1b as detailed in the “My Lost Streaming MP3 Article” blog entry. So you need to add a plugin to support MP3: the JMF Formats list does mention MP3 (under … Read more

How can I split (copy) a Stream in .NET?

I have made a SplitStream available on github and NuGet. It goes like this. using (var inputSplitStream = new ReadableSplitStream(inputSourceStream)) using (var inputFileStream = inputSplitStream.GetForwardReadOnlyStream()) using (var outputFileStream = File.OpenWrite(“MyFileOnAnyFilestore.bin”)) using (var inputSha1Stream = inputSplitStream.GetForwardReadOnlyStream()) using (var outputSha1Stream = SHA1.Create()) { inputSplitStream.StartReadAhead(); Parallel.Invoke( () => { var bytes = outputSha1Stream.ComputeHash(inputSha1Stream); var checksumSha1 = string.Join(“”, bytes.Select(x … Read more