ByteArray | C++ byte array implementation | Base64 library

After posting here, I figured out how to fix it.

In the video_feed function, in the media_type parameter, it was just to put it in the same way as in the flask:

Check your database inspector to know if the table 'countries' really exist.

If not you need to recreate it in your Database Helper.

use eval to first convert the list items into bytearray object then call decode to convert bytearray object back to string.

If you aren't using clustered Vert.x, you can just send and receive ByteArray.

You may need to implement a no-op codec, though: https://alexey-soshin.medium.com/understanding-vert-x-event-bus-c31759757ce8

When a mutex is locked, all other calls to Mutex.Lock() will block until Mutex.Unlock() is called first.

So while your handler is running (and holding the mutex), all other requests will get blocked at the Lock() call.

Note: if your handler doesn't complete normally because you return early (using a return statement), or it panics, your mutex will remain locked, and hence all further requests will block.

A good practice is to use defer to unlock a mutex, right after it is locked:

There is a few things wrong with this code. If you would try and follow these steps (can be done in in onCreateView).

1. Init the recyclerview that is associated with this layout. RecyclerView recyclerView = findViewById(R.id.recycler_view);

2. Init the adapter that you would like to link with this recyclerview. adapter = new MyAwesomeAdapter(myAwesomeCountryList);

3. Add the adapter to the recyclerview. recyclerView.setAdapter(adapter);

4. Adding a layoutmanager to the recyclerview. recyclerView.setLayoutManager(layoutManager)

If you have done that, you are quite close (hopefully it solves it but there are more things we can not see, such as how you set up your associated layout).

in which real life scenarios should you convert in your code strings into bytes and why?

One example is using some compression algorithm which works on bytes rather than str. Take look at lzma built-in module examples, note that it does work with bytes rather than str. In case of a lot of text this allow more effiecient usage of available memory (i.e. saving same text in smaller space).

The callback function you are passing with .then(function (ArrayBuffer) { } will be executed asynchronously.

That means, your program will continue the flow and not wait for its execution and result. Because of that, you cannot use the result of this function as a condition to break from the loop. Program will flow to the next loop regardless of what happened inside that function.

In order to decide on breaking the loop or not based on the result of the function, you must block the program flow until the function is finished.

I suggest you to take a look at the await keyword and functionality. There are tons of tutorials over the web about it, like here or here.

I do not know the details of the functions you are calling, but it might look something like this:

You can't use serialPuts to send the null terminator. As with all similar functions, it will stop when the null terminator is encountered in the string. In this case I think your best option is to add a function that uses the ordinary write function that is used internally by WiringPi's own functions.

You could make a wrapper function to make it look similar to the other calls: