If I close a region, that has also a nested region - will it properly close the both or every region should be closed separately?
Every child of a region that is being closed will also be closed properly. So there's no need to do that separately.
See: https://github.com/marionettejs/backbone.marionette/blob/master/docs/marionette.layout.md#closing-a-layout
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What does $(selector)[0] mean in jQuery?
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I have a button called search, when I click it it will make an AJAX request and it will fetch me some data,
How can I write an event handler function that will run when AJAX is loaded completely? i.e For example once all the search result is displayed I need to do something in that handler function.
This is just accessing an array (or an object) by index (or key). Nothing specific to jQuery.
In your case, you get a list of DOM elements from your selector, so [0] gives you the first one.
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reactjs.net - are react-text tags required when rendered?
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Closed 5 years ago.
What is react-text ?
It does not exist in the code, but it appears in html after rendering
React tries to diff the minimal amount of dom it can and it needs to track the dom rendered for every child. For empty string childs it tracks it using these comment tag. So no, you cannot (and should not) remove these.
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https://facebook.github.io/react/blog/2016/04/07/react-v15.html#no-more-extra-ltspangts
We received some amazing contributions from the community in this release, and we would like to highlight this pull request by Michael Wiencek in particular. Thanks to Michael’s work, React 15 no longer emits extra nodes around the text, making the DOM output much cleaner. This was a longstanding annoyance for React users so it’s exciting to accept this as an outside contribution.
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These will not appear if you do not render anything e.g. null. But for a string like (a space), these will appear.
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I am looking for an example that present a proper way to pass data between tasks:
Lets say I have a display, keyboard and some sensors eg. internal ADCs.
I would like to show values from all sensors at some time on a display. After pressing a button, changing a view and presenting some text. After pressing another, going back to values.
I would use global variables, but it is described everywhere as a bad idea. On the other hand, if I used Queues (xQueueCreate, xQueueReceive, xQueueSend), I wouldnt have all data to display it and I believe that creating a copy after receiving them is just losing memory.
You already mentioned some of possible solutions, but saying that you're loosing memory because you copy data, it's always the case if you want to secure this data from i.e. writing from two different places, anyway just by using FreeRTOS you already decided to loose a lot of memory for i.e. context switching, task handling and all other resources that FreeRTOS uses. Possible solutions are:
Global variable - The reason's why it's a bad idea, is because
ideally you want to limit access to variable (scope). As well it's hard to
keep it safe, because during task switch other task could write to
the same variable, and possible corrupt your data. But if you
protect it right i.e. lock the variable using some kind of flag,
it's perfectly fine solution, and using i.e. sempahore or queue to notify display task that data is filled.
Queues - you could send from multiple tasks and as you said keeping in display task copy of variables, it's much safer option, and it doesn't have to be loosing memory, because you don't have to store it any other place, you could just read sensor, then put it in queue, and then when you received it in display task you change your previous value. So task which read's data from let's say ADC doesn't need to store it in between reads.
Queues - but a little bit different that you proposed, if you got direct flow in system let's say first you check keyboard, then sensor, then something else you could send queue with struct from TASK1 -> TASK2 -> TASK3 -> ... TASKX -> DISPLAY_TASK this way variable would have certain flow, and you would make sure that you always have all data in one place.
You could use the same paramater in all structs (pvParameters in taskCreation), so you would point to the same structure, in this case to protect data you could use mutex during write to variable (so you know only 1 task at a time got access to this variable). You could use mutex in global variable option as well.
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I've been searching online but all the top results on Google only lead me to Java. This is frustrating.
What I want to do is: make a program that listens to keyboard events, without being the active program. It has to work on at least windows 7, using C.
For example lets say I have myprogram.exe and other.exe. I want to be able to run both of them simultaneously, and have focus on other.exe, then press keys, and have myprogram.exe which runs on the side display which keys I pressed and log them.
If somebody has a link to a guide or information that explains what I should use to make this, that would be grand. If you can write up an explanation yourself that would be even better, but I don't mind going through documentations as long as they're relevant.
I've written games in C that listen to input from the active window, but I'm not sure how to poll events when the window isn't focused.
If you want to detect 'key press' events occurred in other processes, you should implement Global Hook. You can define a callback function for keyboard input events using SetWindowsHookEx().
Note that the callback function must be in a DLL in order to make it Global Hook.
So your myprogram.exe should link a dll implementing the hook. Then myprogram.exe would be able to detect any keyboard events on Windows.
Following is a good example with an explanation.
http://www.codeproject.com/Articles/1264/KeyBoard-Hooks
I'm developing a simple win32 application with two processes sharing memory through a file mapping. At a certain point in the second process, I want to check if the other process has already closed the handle associated to the file mapping.
Is there a Windows function to retrieve the number of handles associated to my shared memory???
Thanks in advance for any help...
There's nothing in the API to do that. If you want to know when the other process has finished its work, create a manual reset event with CreateEventEx, and have the other process set the event when its work is done. The first process can use one of the wait functions to query the status of the event.