I'm making a simple helper class for accessing my barcode scanner. I can do it using SerialPort constructor like:
new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One);
But I want my class to autodetect propper port name, so I first find the DeviceInformation:
var all = await DeviceInformation.FindAllAsync();
var foundBarcode = all.First(device => device.Name.ToLower().Contains("barcode"));
Then I try to get It like this:
var serialDevice = await SerialDevice.FromIdAsync(foundBarcode.Id);
But when I do so I get 'System.IO.DirectoryNotFoundException' in System.Private.CoreLib.dll.
How can I fix it?
PS.
I have serial communication capability in my manifest.
I found a solution, appearently
DeviceInformation.FindAllAsync();
returns items with different ids than
string selector = SerialDevice.GetDeviceSelector();
var all = await DeviceInformation.FindAllAsync(selector);
Now it works, I guess when first approach adds some USB identificator for emulated COMs.
Related
I am trying to setup automation to sign into my school. they add a discussion that i have to click on and type "here", in the name of the discussion they call it:"Attendance Month/Date" so i used
let current_datetime = new Date();
let formatted_date = (current_datetime.getMonth() + 1) + "/" + current_datetime.getDate();
which outputs the date "10/26" which i am trying to use to search for it in the page. I then decided to use const attendance = await page.$x("//a[contains(., Formatted_date)]"); await attendance[0].click(); which i found from someones answer on here already. When i try to use it the console will give me (node:15236) UnhandledPromiseRejectionWarning: Error: Node is either not visible or not an HTMLElement but if i use const attendance = await page.$x("//a[contains(., '10/26')]"); await attendance[0].click(); it works fine, is there a way to fix/workaround it?
I figured it out i forgot to put +""+ around the variable
I am working on use of serial port access with chrome browser, using "navigator.serial".
My initial experiment is based on a prior posting to stackoverflow:
Is there an example site that uses navigator.serial?
I have duplicated the code example referenced above, and have made the required configuration change #enable-experimental-web-platform-features, again as described above.
I am doing this all on Ubuntu 18.04. There are two USB serial ports attached to the machine, and I have verified using gtkterm that I can send and receive data between the two ports.
From the example given (code duplicated below), I find that I can open the serial port and establish a "reader", and the step await reader.read() does wait until an incoming character appears on the serial port, but at this point the variabler/object "data" remains undefined.
Two questions/issues:
What am I doing wrong that leaves "data" undefined? I added an alert() dialog box that pops up once const {done, data} = await reader.read(); proceeds, however, the dialog box says that "data" is at that point undefined. Is data a promise that I am failing to wait to be fulfilled?
I have not been able to find a (hopefully self-contained) reference on the methods and members of the classes involved (i.e., reader.read() and reader.write() are methods available to my object "readeer"; where can I find a list of available methods, and the properties of these?
Here is a copy of the code (small web page) that was obtained from the year-ago posting above:
<html>
<script>
var port;
var buffy = new ArrayBuffer(1);
var writer;
buffy[0]=10;
const test = async function () {
const requestOptions = {
// Filter on devices with the Arduino USB vendor ID.
//filters: [{ vendorId: 0x2341 }],
};
// Request an Arduino from the user.
port = await navigator.serial.requestPort(requestOptions);
// Open and begin reading.
await port.open({ baudrate: 115200 });
//const reader = port.in.getReader();
const reader = port.readable.getReader();
writer = port.writable.getWriter();
//const writer = port.writable.getWriter();
//writer.write(buffy);
while (true) {
const {done, data} = await reader.read();
if (done) break;
console.log(data);
}
} // end of function
</script>
<button onclick="test()">Click It</button>
</html>
Thank you for any assistance!
I was having the exact same problem and managed to solve it.
Change
const {done, data} = await reader.read();
To
const {value, done} = await reader.read();
The example where you got this from (and a few others) were wrong, params around the wrong way.
Also, not too sure why but when I used
const {data, done} = await reader.read();
it did not work either, it did not like the var data.
Documentation on navigator.serial is not great. Here are some links to help
The API (note this is draft and does not exactly match the Chrome implementation)
https://wicg.github.io/serial/
port.readable.getReader() is a ReadableStream
https://streams.spec.whatwg.org/#readablestream
that uses ReadableStreamDefaultReader which is defined as
dictionary ReadableStreamDefaultReadResult {
any value;
boolean done;
};
https://streams.spec.whatwg.org/#readablestreamdefaultreader
An explainer
https://github.com/WICG/serial/blob/gh-pages/EXPLAINER.md
A tutorial
https://codelabs.developers.google.com/codelabs/web-serial
Chromium tracker
https://goo.gle/fugu-api-tracker
The Web Serial API work item
https://bugs.chromium.org/p/chromium/issues/detail?id=884928
This is what RSS looks like: https://reddit.0qz.fun/r/dankmemes/top.json
My script perfectly parses "title", "description" and other items tags from the RSS. But it doesn't parse "content:encoded".
I tried this:
item.getChild("content:encoded").getText();
And this:
item.getChild("encoded").getText();
And this (found on Stackoverflow):
item.getChild("http://purl.org/rss/1.0/modules/content/","encoded").getText();
But nothing works... Could you help me?
The namespace is important for the getChild and similar methods to parse the content successfully.
Your third example is close, but you have the parameter order backwards, and you need to use the XmlService.getNamespace method, not a raw string. (The signature is getChild(string, namespace), not getChild(string, string).)
This one is tricky as the namespace should be included for some of the elements, and not for others. I am not an XML expert, so I don't know if this is expected behavior or not. The minimal example script below does find and log the text of the <content:encoded> elements using getChild, but I was only able to figure out when to include or exclude the namespace through trial and error. (If anyone has further info on why this is, please let me know in the comments.)
function logContentEncoded() {
const result = UrlFetchApp.fetch("https://reddit.0qz.fun/r/dankmemes/top.json");
const document = XmlService.parse(result.getContentText());
const root = document.getRootElement();
const namespace = XmlService.getNamespace("http://purl.org/rss/1.0/modules/content/");
const channel = root.getChild("channel"); // fails if namespace is included
const item = channel.getChild("item"); // fails if namespace is included
const encoded = item.getChild("encoded", namespace); // fails if namespace is EXCLUDED
console.log(encoded.getText());
}
Adding this library to the project: 1Mc8BthYthXx6CoIz90-JiSzSafVnT6U3t0z_W3hLTAX5ek4w0G_EIrNw
You can scrape the page. With this code, i.e., You can get the first content of <content:encoded> tags.
function getDataFromJson() {
var url = "https://reddit.0qz.fun/r/dankmemes/top.json";
var fromText = '<content:encoded>';
var toText = '</content:encoded>';
var content = UrlFetchApp.fetch(url).getContentText();
var scraped = Parser
.data(content)
.from(fromText)
.to(toText)
.build();
Logger.log(scraped);
return scraped;
}
I am looking for a way to uniquely identify a user in WinRT and preferably in WP8 as well. In WP7 applications, I could get a hash of the Live ID to do this, but I am not sure of how to approach this in WinRT environment. One of the goals here is to identify the user in Windows 8 environment as a whole. Using LiveID in one form or another would be ok in this case. I found some sources but they also mentioned that this might require some Enterprise Security permissions (or such) that are not welcome in the Windows Marketplace.
Say I want to identify the user based on the live id, I want to do it automatically and across multiple devices (PC, Tablet, maybe WP8). What resources should I be looking for?
You can obtain ID of each live user if you are using Live SDK. Here's code for you.
private async Task<string> GetLiveUserId()
{
string ID = "";
var auth = new LiveAuthClient();
var loginResult = await auth.LoginAsync(new string[] { "wl.signin", "wl.basic" });
if (loginResult.Status == LiveConnectSessionStatus.Connected)
{
var liveClient = new LiveConnectClient(loginResult.Session);
var myData = await liveClient.GetAsync("me");
ID = myData.Result["id"].ToString();
}
return ID;
}
Why when I get MacAdress there is different Values when NetworkAdapter is Enabled and Disabled...? Please help, i need to take unique ID..
var networkInterface : Object = NetworkInfo.networkInfo.findInterfaces();
var networkInfo : Object = networkInterface[0];
var strNet : String = networkInfo.hardwareAddress.toString();
trace(strNet);
Maybe flash get mac address of default network interface from the OS. When you turn off one interface, OS get another as default. As mentioned by Apocalyptic0n3, using UID is a better way. And you can save UID in Flash Shared Object for next running...