I am building an app for an LG Smart TV. I need to load json data from a USB drive when it's inserted into the smart TV.
I'm not sure how to do this, never worked on an app like this.
My question is how do I gain access to external storage and load json data into my app?
Using the SCAP API (v1.2+)
function readFile() {
var successCb = function (cbObject) {
var data_text = cbObject.data;
// do something with the json string
};
var failureCb = function (cbObject) {
var errorCode = cbObject.errorCode;
var errorText = cbObject.errorText;
// do something with the error
};
// Read the whole file from the beginning, as a text file.
var options = {
path: "file://usb:[INDEX]/[FILE_PATH]",
position: 0,
encoding: 'utf8'
};
var storage = new Storage();
storage.readFile(successCb, failureCb, options);
}
The filepath for a usb is file://usb:[INDEX]/[FILE_PATH] [INDEX] is the usb index (could have multiple USBs connected).
Additional help can be found here: http://webossignage.developer.lge.com/api/scap-api/scap16/storage/?wos_flag=readFile#readFile
You can use getStorageInfo() to check if your usb is available.
Related
I am attempting to get the basic tutorial for the AWS Chime SDK to work in our application and the meetingSession.audioVideo.listVideoInputDevices() always returns nothing/null.
I am running this on lastest chrome, my operating system is a windows 10 workspace instance. I have headphones plugged in; but that shouldn't make a difference.
My expected result is to return at least one device for the video. Here is the output from the Logger.
2020-08-26T15:29:19.127Z [INFO] MyLogger - attempting to trigger media device labels since they are hidden
chime-bundle.js:1 2020-08-26T15:29:19.133Z [INFO] MyLogger - unable to get media device labels
chime-bundle.js:1 2020-08-26T15:29:19.134Z [INFO] MyLogger - API/DefaultDeviceController/listVideoInputDevices null -> []
chime-bundle.js:1 Uncaught (in promise) TypeError: Cannot read property 'deviceId' of undefined
*Note. The video and audio elements are not hidden.
I have tried the code snippits from various demos. Which are all just a copy of AWS's walkthrough. So pretty much zero information. I have researched how the audio devices work in html5 and looking through the files provided in the sdk-js, I am even more confused. Can someone point me in the right direction?
Here is the basic code, you can get it, and a description from the link above.
var fetchResult = await window.fetch(
window.encodeURI("<our endpoint for backend (running c# instead of node)>",
{
method: 'POST'
}
);
let result = await fetchResult.json();
console.log("Result from Chime API:", result);
const logger = new ConsoleLogger('MyLogger', LogLevel.INFO);
const deviceController = new DefaultDeviceController(logger);
const meetingResponse = result.JoinInfo.Meeting;
const attendeeResponse = result.JoinInfo.Attendee;
const configuration = new MeetingSessionConfiguration(meetingResponse, attendeeResponse);
// In the usage examples below, you will use this meetingSession object.
const meetingSession = new DefaultMeetingSession(
configuration,
logger,
deviceController
);
console.log("MEETING SESSION", meetingSession);
//SETUP AUDIO
const audioElement = document.getElementById('notary-audio');
meetingSession.audioVideo.bindAudioElement(audioElement);
const videoElement = document.getElementById('notary-video');
// Make sure you have chosen your camera. In this use case, you will choose the first device.
const videoInputDevices = await meetingSession.audioVideo.listVideoInputDevices();
// The camera LED light will turn on indicating that it is now capturing.
// See the "Device" section for details.
await meetingSession.audioVideo.chooseVideoInputDevice(videoInputDevices[0].deviceId);
const observer = {
audioVideoDidStart: () => {
console.log('Started');
},
audioVideoDidStop: sessionStatus => {
// See the "Stopping a session" section for details.
console.log('Stopped with a session status code: ', sessionStatus.statusCode());
},
audioVideoDidStartConnecting: reconnecting => {
if (reconnecting) {
// e.g. the WiFi connection is dropped.
console.log('Attempting to reconnect');
}
},
// videoTileDidUpdate is called whenever a new tile is created or tileState changes.
videoTileDidUpdate: tileState => {
// Ignore a tile without attendee ID and other attendee's tile.
if (!tileState.boundAttendeeId || !tileState.localTile) {
return;
}
// videoTileDidUpdate is also invoked when you call startLocalVideoTile or tileState changes.
console.log(`If you called stopLocalVideoTile, ${tileState.active} is false.`);
meetingSession.audioVideo.bindVideoElement(tileState.tileId, videoElement);
localTileId = tileState.tileId;
},
videoTileWasRemoved: tileId => {
if (localTileId === tileId) {
console.log(`You called removeLocalVideoTile. videoElement can be bound to another tile.`);
localTileId = null;
}
}
};
meetingSession.audioVideo.addObserver(observer);
meetingSession.audioVideo.start();
I'm trying to save some files on my local File storage So, I'm doing Something like below
var folder_name = "abcde/" + viewModel.dir_path;
const documents = fileSystemModule.knownFolders.documents();
documents._path = android.os.Environment.getExternalStorageDirectory().getAbsolutePath();
const folder = documents.getFolder(folder_name);
var file = fileSystemModule.path.join(folder._path, this.pdf_url.split("/").pop());
var url = this.pdf_url;
httpModule.getFile(url, file).then(function(result) {
console.log(result);
Toast.makeText(`${result._name} is succesfully downloaded in ${folder_name}`).show();
}, function(e) {
console.log(e);
});
the only problem is the hardcoded value abcde/ I want it to be app name. whatever the app name is it should take that name.
I don't find any ways to read app name programatically. I need this to Android I'm not interested in IOS.
may be this is one could be the answer. but still this is not a proper way
const documents = fileSystemModule.knownFolders.currentApp();
console.log(documents); --> "/data/data/org.nativescript.app_name/files/app"
var str = documents;
var arr = str.split("/")[3];
console.log(arr.split(".")[2]); ---> app_name
In Android, you can set the app name for the application in strings.xml, for example:
<string name="app_name">"App_Name"</string>
Then whenever you want to reuse the app name, you can use the getString method with its name in the application.
I really love the DropZoneJS component and am currently wrapping it in an EmberJS component (you can see demo here). In any event, the wrapper works just fine but I wanted to listen in on one of Dropzone's events and introspect the file contents (not the meta info like size, lastModified, etc.). The file type I'm dealing with is an XML file and I'd like to look "into" it to validate before sending it.
How can one do that? I would have thought the contents would hang off of the file object that you can pick up on many of the events but unless I'm just missing something obvious, it isn't there. :(
This worked for me:
Dropzone.options.PDFDrop = {
maxFilesize: 10, // Mb
accept: function(file, done) {
var reader = new FileReader();
reader.addEventListener("loadend", function(event) { console.log(event.target.result);});
reader.readAsText(file);
}
};
could also use reader.reaAsBinaryString() if binary data!
Ok, I've answer my own question and since others appear interested I'll post my answer here. For a working demo of this you can find it here:
https://ui-dropzone.firebaseapp.com/demo-local-data
In the demo I've wrapped the Dropzone component in the EmberJS framework but if you look at the code you'll find it's just Javascript code, nothing much to be afraid of. :)
The things we'll do are:
Get the file before the network request
The key thing we need become familiar with is the HTML5 API. Good news is it is quite simple. Take a look at this code and maybe that's all you need:
/**
* Replaces the XHR's send operation so that the stream can be
* retrieved on the client side instead being sent to the server.
* The function name is a little confusing (other than it replaces the "send"
* from Dropzonejs) because really what it's doing is reading the file and
* NOT sending to the server.
*/
_sendIntercept(file, options={}) {
return new RSVP.Promise((resolve,reject) => {
if(!options.readType) {
const mime = file.type;
const textType = a(_textTypes).any(type => {
const re = new RegExp(type);
return re.test(mime);
});
options.readType = textType ? 'readAsText' : 'readAsDataURL';
}
let reader = new window.FileReader();
reader.onload = () => {
resolve(reader.result);
};
reader.onerror = () => {
reject(reader.result);
};
// run the reader
reader[options.readType](file);
});
},
https://github.com/lifegadget/ui-dropzone/blob/0.7.2/addon/mixins/xhr-intercept.js#L10-L38
The code above returns a Promise which resolves once the file that's been dropped into the browser has been "read" into Javascript. This should be very quick as it's all local (do be aware that if you're downloading really large files you might want to "chunk" it ... that's a more advanced topic).
Hook into Dropzone
Now we need to find somewhere to hook into in Dropzone to read the file contents and stop the network request that we no longer need. Since the HTML5 File API just needs a File object you'll notice that Dropzone provides all sorts of hooks for that.
I decided on the "accept" hook because it would give me the opportunity to download the file and validate all in one go (for me it's mainly about drag and dropping XML's and so the content of the file is a part of the validation process) and crucially it happens before the network request.
Now it's important you realise that we're "replacing" the accept function not listening to the event it fires. If we just listened we would still incur a network request. So to **overload* accept we do something like this:
this.accept = this.localAcceptHandler; // replace "accept" on Dropzone
This will only work if this is the Dropzone object. You can achieve that by:
including it in your init hook function
including it as part of your instantiation (e.g., new Dropzone({accept: {...})
Now we've referred to the "localAcceptHandler", let me introduce it to you:
localAcceptHandler(file, done) {
this._sendIntercept(file).then(result => {
file.contents = result;
if(typeOf(this.localSuccess) === 'function') {
this.localSuccess(file, done);
} else {
done(); // empty done signals success
}
}).catch(result => {
if(typeOf(this.localFailure) === 'function') {
file.contents = result;
this.localFailure(file, done);
} else {
done(`Failed to download file ${file.name}`);
console.warn(file);
}
});
}
https://github.com/lifegadget/ui-dropzone/blob/0.7.2/addon/mixins/xhr-intercept.js#L40-L64
In quick summary it does the following:
read the contents of the file (aka, _sendIntercept)
based on mime type read the file either via readAsText or readAsDataURL
save the file contents to the .contents property of the file
Stop the send
To intercept the sending of the request on the network but still maintain the rest of the workflow we will replace a function called submitRequest. In the Dropzone code this function is a one liner and what I did was replace it with my own one-liner:
this._finished(files,'locally resolved, refer to "contents" property');
https://github.com/lifegadget/ui-dropzone/blob/0.7.2/addon/mixins/xhr-intercept.js#L66-L70
Provide access to retrieved document
The last step is just to ensure that our localAcceptHandler is put in place of the accept routine that dropzone supplies:
https://github.com/lifegadget/ui-dropzone/blob/0.7.2/addon/components/drop-zone.js#L88-L95
using the FileReader() solution is working amazingly good for me:
Dropzone.autoDiscover = false;
var dz = new Dropzone("#demo-upload",{
autoProcessQueue:false,
url:'upload.php'
});
dz.on("drop",function drop(e) {
var files = [];
for (var i = 0; i < e.dataTransfer.files.length; i++) {
files[i] = e.dataTransfer.files[i];
}
var reader = new FileReader();
reader.onload = function(event) {
var line = event.target.result.split('\n');
for ( var i = 0; i < line.length; i++){
console.log(line);
}
};
reader.readAsText(files[files.length-1]);
I'm trying to create an interactive search engine (for finding event tickets) of which one of its features is a visual map that shows related venues using OpenLayers. I have a plethora of venues (3000+) in a kml file that I would like to selectively show a filtered subsection of. Below is the code I have but when I try to run it has a JavaScript error. Running firebug and chrome developer tools makes me think that it is not getting passed the parameters I give because it says that the variables are null. However, I cannot figure out why they are not getting passed. Any insight is greatly appreciated.
var map, drawControls, selectControl, selectedFeature, select;
$('#kml').load('venuesComplete.kml');
kml=$('#kml').html();
function showVenues(state, city, venue){
filterStrategy = new OpenLayers.Strategy.Filter({});
var kmllayer = new OpenLayers.Layer.Vector("KML", {
strategies: [filterStrategy,
new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "venuesComplete.kml",
format: new OpenLayers.Format.KML({
extractStyles: true,
extractAttributes: true
})
})
});
select = new OpenLayers.Control.SelectFeature(kmllayer);
kmllayer.events.on({
"featureselected": onFeatureSelect,
"featureunselected": onFeatureUnselect
});
map.addControl(select);
select.activate();
filter = new OpenLayers.Filter.Comparison({
type: OpenLayers.Filter.Comparison.LIKE,
property: "",
value: ""
});
function clearFilter(){
filterStrategy.setFilter(null);
}
function setFilter(property, value){
filter.value = value;
filter.property = property;
filterStrategy.setFilter(filter);
}
var vector_style = new OpenLayers.Style();
if(venue!=""){
setFilter('name', venue);
}else if(city!=""){
setFilter('description', city);
}else if(state!=""){
setFilter('description', state);
}
map.addLayer(kmllayer);
function onPopupClose(evt) {
select.unselectAll();
}
function onFeatureSelect(event) {
var feature = event.feature;
var selectedFeature = feature;
var popup = new OpenLayers.Popup.FramedCloud("chicken",
feature.geometry.getBounds().getCenterLonLat(),
new OpenLayers.Size(100,100),
"<h2>"+feature.attributes.name + "</h2>" + feature.attributes.description +'<br>'+feature.attributes,
null,
true,
onPopupClose
);
document.getElementById('venueName').value=feature.attributes.name;
document.getElementById("output").innerHTML=event.feature.id;
feature.popup = popup;
map.addPopup(popup);
}
function onFeatureUnselect(event) {
var feature = event.feature;
if(feature.popup) {
map.removePopup(feature.popup);
feature.popup.destroy();
delete feature.popup;
}
}
}
function init() {
map = new OpenLayers.Map('map');
var google_map_layer = new OpenLayers.Layer.Google(
'Google Map Layer',
{type: google.maps.MapTypeId.HYBRID}
);
map.addLayer(google_map_layer);
state="";
state+=document.getElementById('stateProvDesc').value;
city="";
city+=document.getElementById('cityZip').value;
venue="";
venue+=document.getElementById('venueName').value;
showVenues(state,city,'Michie Stadium');
map.addControl(new OpenLayers.Control.LayerSwitcher({}));
map.zoomToMaxExtent();
}
IF I UNDERSTAND CORRECTLY, your kml does not load properly. if this is not the case, please disconsider my answer.
it is very important to check if your kml layer was properly loaded. i have a map that loads multiple dynamic (from php) kml layers and it is not uncommon to have a large layer simply not load. when that happens, the operation is aborted, but, as far as openlayers is concerned, the layer was properly loaded.
so i do 2 things: i check if the amount of loaded data meets the expected number of features in my orginal php kml parser (i use a jquery or ajax call for that) and then, in case there is a discrepancy, i try reloading (since this is a loop, i limit it to 5 attempts, so as not to loop infinitely).
check out some of my code here
I am trying to implement the Google Feed API to access an ATOM feed from a server and then display the data on a mobile web app. I get the error "The port specified in the feed URL is not supported." Any thoughts or suggestions?
// Google Feed API
//Our callback function, for when a feed is loaded.
function feedLoaded(result) {
if (!result.error) {
console.log("no error in loading feed");
// Grab the container we will put the results into
var container = document.getElementById("page_contents");
container.innerHTML = '';
// Loop through the feeds, putting the titles onto the page.
// Check out the result object for a list of properties returned in each entry.
// http://code.google.com/apis/ajaxfeeds/documentation/reference.html#JSON
for (var i = 0; i < result.feed.entries.length; i++) {
var entry = result.feed.entries[i];
var div = document.createElement("div");
div.appendChild(document.createTextNode(entry.content));
container.appendChild(div);
}
console.log(result.feed.entries.length);
} else {
var container = document.getElementById("page_contents");
container.innerHTML = '';
var div = document.createElement("div");
div.appendChild(document.createTextNode(result.error.message));
container.appendChild(div);
alert(result.error.message);
}
}
function OnLoad() {
// Create a feed instance that will grab Digg's feed.
var feed = new google.feeds.Feed("http://localhost:8082/frevvo/web/tn/billy.com/api/apps");
//var feed = new google.feeds.Feed("http://www.digg.com/rss/index.xml");
if (!feed) {
alert("feed object not created");
}
console.log("loading feed");
// Calling load sends the request off. It requires a callback function.
feed.load(feedLoaded);
}
The only place where you appear to be setting a port is where you specify the URL http://localhost:8082/frevvo/web/tn/billy.com/api/apps.
Change that URL to an RSS feed somewhere that doesn't use a non-standard port like that and this error will almost certainly go away.
For testing, I'll often go to a news web site and grab their RSS feed URL, e.g., http://rss.cnn.com/rss/cnn_topstories.rss.