I need to pass both a flash value and a session value into one view in Play Framework. Is this possible?
Both the session and the flash objects are accessible from the request. Simply pass request from a controller to a view. Usually it's done by an implicit parameter:
#()(implicit request: RequestHeader)
#request.session.get("yourSessionKey")
#request.flash.get("yourFlashKey")
#()(implicit flash : Flash, request: RequestHeader)
And then you can use it like this:
#if(request.session.get("example").toList(0) == example2){
<h5>example</h5>
}
Related
I'm trying to extend the native GamepadAPI to include custom controller code.
Using TypeScript, I implemented a simple function, to dispatch a "gamepadconnected" event.
// simulate gamepadconnected event
function dispatchGamepadConnectedEvent() {
let gamepad = Object.create(Gamepad.prototype);
console.log(gamepad);
let event = new GamepadEvent('gamepadconnected', {
gamepad: gamepad
})
window.dispatchEvent(event);
console.log('Gamepad connect event dispatched.');
}
However, when dispatching the event, I get an error:
Gamepad {}axes: (...)buttons: (...)connected: (...)id: (...)index: (...)mapping: (...)timestamp: (...)vibrationActuator: (...)__proto__: Gamepad
extension.ts:37 Uncaught TypeError: Failed to construct 'GamepadEvent': member gamepad is not of type Gamepad.
at dispatchGamepadConnectedEvent (extension.ts:37)
at extension.ts:48
Even though, the instantiated Gamepad object seems fine, the type of the Gamepad is not correct.
Why is this like that? How can I create a new, proper Gamepad object to fire the native event?
You cannot create a native Gamepad object.
Object.create(Gamepad.prototype) does not create a Gamepad. It creates an object and sets it prototype to Gamepad.prototype. While this trickery often works for application-level APIs, it won't fool native browser APIs.
Your choices are:
Pass null: {gamepad: null}
Pass an actual gamepad reference {gamepad: navigator.getGamepads()[0]}
Dispatch a CustomEvent, not a GamepadEvent.
Try something else entirely.
Not sure about the use case that's behind your question, but one alternative might be to use the WebHID API. I have recently used this API to create a Nintendo Joy-Con driver in JavaScript. If there happen to be reverse engineering efforts for your device in question (hint: check if there is a Linux driver), chances are that you can use this to talk to your device over WebHID.
I want to be able to encode video frames using Media Foundation IMFTransform for H264 Video Encoding. That's easily doable in Win32, where you can use MFTEnumEx to enumerate the transforms and find the H264 encoder.
However, on WinRT (Store Apps), I can't find a way to instantiate.
I've noticed there's a class CMSH264EncoderMFT, but there's no definition for the CLSID to use on CoCreateInstance.
With:
CoCreateInstance(CLSID_CMSH264EncoderMFT, nullptr, CLSCTX_INPROC_SERVER, __uuidof(IUnknown), (void **)&pUnknown);
CLSID_CMSH264EncoderMFT is undefined for WinRT apps.
And tried:
ComPtr<CMSH264EncoderMFT> encoder = Make<CMSH264EncoderMFT>();
It says the class CMSH264EncoderMFT is incomplete, and says "use of undefined type 'CMSH264EncoderMFT'". Don't even know if the syntax for Make is correct or appropriate...
Does anyone have a clue on how to do this for WinRT?
Use MFCreateSinkWriterFromURL to create a file writer first. Then, use MFCreateMediaType to create an IMFMediaType. Set up its properties, one of which will be the output format: use SetGUID method on the media type with MF_MT_SUBTYPE guid and specify MFVideoFormat_H264 as the argument. Finally, use AddStream method on the sink writer to set the media type to it.
There's an example here (you'll need to modify it a bit when it sets MF_MT_SUBTYPE).
you cannot instantiate object via CMSH264EncoderMFT because it DOES NOT have some interfaces which MUST have object in WinRT for example IInspectable - Provides functionality required for all Windows Runtime classes. CMSH264EncoderMFT IS NOT WinRT class. You can try resolve your task by function MFCreateSinkWriterFromMediaSink - this function takes an object with interface IMFMediaSink. It is possible write code for object with IMFMediaSink interface and receive samples from IMFTransform::ProcessOutput. I just point your attention - you cannot instantiate in WindowsStore code objects which IS NOT Windows Runtime classes.
Regards,
Evgeny Pereguda
I am writing an app that runs from the browser. However, some model functions are also called from the Yii2 console. Therefore, I am getting errors when trying to access variables that are set in the GUI.
Is it possible to tell which mode I am in? Is there some environment variable automatically set, or should I just set some session variable in the console app to indicate the state?
You can use
if (Yii::$app instanceof \yii\console\Application)
for console, and
if (Yii::$app instanceof \yii\web\Application)
for web.
Correct variant
Yii::$app->request->isConsoleRequest
There is a simpler way to figure this out without going through the Yii objects
if (php_sapi_name() == "cli") {
return;
}
...and it works for all PHP scripts
...and it is lighter
By default for console:
Yii::$app->id == 'basic-console'
And for web application:
Yii::$app->id == 'basic'
Yii::$app->id stores the id of the loaded configuration params. By default for console application it is 'basic-console' and for web application it is 'basic' (defined in configuration file)
Yii2 provides a number of different classes for application's console and for those of type web. In addition to this division of the mode of operation of the classes, there are also a set of rules governing the organization of the code of the application. The first, fundamental, it is the respect of giving the MVC Model object information, to view the management interface with the user and, finally, to the controller the role of coordination among them. In your case it seems to sense that a piece of code runs in console but referring to classes that provide a Web interface. Probably because in some Model classes were introduced with functions with HTML or other code that should not be there. If you need two separate applications should precisely separate applications that use a type controls
yii\console\Controller
and another that uses controller type web
yii\web\Controller.
Obviously Model classes will be common and, thanks to separate controller, be sure to invoke View appropriate to the type of user interface in use. I Hope this could be useful.
Works for nginx and apache:
function isConsole()
{
return 'cli' == php_sapi_name() || !array_key_exists('REQUEST_URI', $_SERVER);
}
Pure PHP:
global $argv;
if (empty($argv)) {
// Browser mode
}
else {
// Cli mode
}
I'm After several days learning angularJS through converting my standart JS app to a ng one.
I was wondering about this simple scenario:
I have a global function called fb_connect(),
it can be used from any page (or any controller if you like) to make a facebook-based login.
This function makes a simple http call and receives a JSON object contain data to move on (display a pop up, login, etc...)
I read that I can define a Factory or a Service for my app and use it in any controller, which works fine.
So, I created a fb_connect factory function.
The problem is that now, in every page (every controller), I have to define that fb_connect in the constructor of every controller - for example :
function welcome($scope,fb_connect){});
What is the proper way to do this kind of actions using Angular without having to define these functions each and every time in every controller?
Thanks
Setting up factories and services is all part of the dependency injection system of Angular. Using that system is great when you need to create things that depend on other injected things. It's a big tree of dependencies. It's also nice for creating singletons, such that everywhere in your code end up using the same instance of some object.
It sounds to me like neither of these benefits apply in your case. I'd suggest just not using Angular's DI for it. You have some function defined globally, just call it directly and skip the DI. There's nothing wrong with that.
Of course you say it makes an Ajax call, so doesn't depend on the Angular $http service?
Your two options are:
Declare the function on the $rootScope
Inject it as a service
My advice is to go with making it a service. The whole purpose of services is explained in the Angular.js docs, just like this quote:
Angular services are singletons that carry out specific tasks common to web apps... To use an Angular service, you identify it as a dependency for the dependent (a controller, or another service) that depends on the service.
As you mentioned in your question, you'd prefer to not define the service in every controller you wish to use it in. With $rootScope you'll be injecting that also in every controller. So really it's a question of which you prefer, although to answer your question, the proper way of using a factory or service is to inject it into the controller you wish to use it in.
You can always put it in the $rootScope
myApp.run(function($rootScope, fb_connect){
$rootScope.welcome = function(){
};
});
I am injecting HttpContextBase into a caching class. HttpContextBase is registered as PerWebRequest. I interact with the caching class on each web request and this works fine, but I also need to initialise the cache at application start.
I understand that PerWebRequest does not work in Application_Start though:
castle PerRequestLifestyle not recognize
What is the best way to resolve this in my situation?
Not use stuff that depends on per-web-request stuff outside of web request.
If you need to depend on a class you registered as PWR I'd suggest getting another component for that service with different lifestyle and using it in Application_Start and using IHandlerSelector to return PWR one when you're within a web request, and the other one otherwise
Try using an hybrid webrequest/transient lifestyle.
To warmup caches when the container starts I usually use the Startable Facility.
Here is an example on how to use it:
http://blog.bittercoder.com/PermaLink,guid,a621ddda-acb5-4afd-84ff-faafb96a2fa1.aspx