I'm trying to connect to fiscal printer using serial port in xamarin.forms application.
I managed to make it work on android, but I have some troubles with UWP.
I am currently testing it on desktop if it matters.
await DeviceInformation.FindAllAsync() - this line never returns, no matter whether I call it with selector or not.
var sel = SerialDevice.GetDeviceSelector("COM7");
var coll = await DeviceInformation.FindAllAsync(sel);
It just hangs. Anybody knows how to use FindAllSync / has a similar problem? I've found some examples on the web, but they do not seem to work, the method always hangs for me.
I also tried to use a different approach and use devicewatcher, I was able to get the list of all devices and the bluetoothdevice object, however I couldn't create a serialport for it.
Related
I was struggling with this for a couple of days now and Google seem to have no information..
I'm trying to interface a DataLogic-QuickScan-QD2131 scanner using OPOS (under windows 10, RS-232 OPOS interface) with nodejs.
I understood that OPOS uses ActiveX controller to communicate, so i use the winax npm-package to create ActiveXObject reference, but I have no idea what is the "class string" i should provide to the constructor.
Here's my code:
require("winax");
const con = new ActiveXObject("OPOSService.OPOSScanner");
console.log(con);
this will fail with the following error:
Uncaught Error: CreateInstance: OPOSService.OPOSScanner Invalid class string
Thanks guys!
You probably should stop using OPOS from Node.js.
As I answered your other question, the current OPOS only supports 32bit.
If you still want to use it, find and specify the programmatic ID string for the scanner OCX in DataLogic's OPOS.
I don't have any information about what it looks like, so you can find it yourself or contact DataLogic.
As an alternative, obtain and install the Common CO from the following page and specify "OPOS.Scanner" as the programmatic ID.
MCS: OPOS Common Control Objects - Current Version
If you have a combination of Node.js and a barcode scanner in serial port mode, it would be better to send commands and receive barcode data directly from Node.js using the serial port instead of OPOS.
I have a small sample application to test speech recog. It works in some machines but not in other machines. In my dev environment where I first installed the necessary packages, it all worked 100% with no issues. But, my team mates are unable to get it working with the installation of our software that has this code in it. We have mixed environments where in some cases we are using Remote Desktop with the application running on the remote machine (so with the device integration via RDP). And also locally without RDP. It does not detect the mic in both cases. Windows detects the mic. The recorder app works and testing all works so we know the mic is being recognized by windows.
However, the speech SDK does not recognize it.
I have tried 2 ways. First ,with using the FromDefaultMicrophoneInput But with that not working, i changed it to FromMicrophoneInput instead and specifed the microphone ID.
Using NAudio to enumerate the microphones, the mic is detected and listed:
var enumerator = new MMDeviceEnumerator();
string specifiedMicID = string.Empty;
foreach (var endpoint in
enumerator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active))
{
if (endpoint.FriendlyName != this.MicName)
continue;
else
{
specifiedMicID = endpoint.ID;
break;
}
}
audioConfig = AudioConfig.FromMicrophoneInput(specifiedMicID);
But, when trying to instantiate the SpeechRecognizer with that audio config:
using (var recognizer = new SpeechRecognizer(config, audioConfig))
{
...
}
We get the SPXERR_MIC_NOT_FOUND. Even thought it is clearly there and working in all other cases in windows and with Naudio detecting it fine.
Any ideas what is going on here?
Thank youj.
Are you creating a UWP application? If so, you'll need to retrieve the audio device IDs differently:
var devices = await DeviceInformation.FindAllAsync(DeviceClass.AudioCapture);
foreach (var device in devices)
{
Console.WriteLine($"{device.Name}, {device.Id}\n");
}
Please refer to the documentation here for more information:
https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/how-to-select-audio-input-devices#audio-device-ids-on-uwp
If you're still having issues, we'd need to get the SDK logs to debug further. Instructions on how to turn on logging can be found here:
https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/how-to-use-logging
I'm trying to access the Bluetooth settings through my application using swift.how can access bluetooth setting?
Xcode version - 8.0
swift - 2.3
iOS - 10
func openBluetooth(){
let url = URL(string: "App-Prefs:root=Bluetooth") //for bluetooth setting
let app = UIApplication.shared
app.openURL(url!)
}
Swift 3.0: working up to iOS 10
Note: This URL is "private API". The app will be rejected by App Store reviewers if used.
You will not be able to use the solution by #Siddharth jain. The Problem: The app will be rejected by Apple with a warning that you should never use non-public APIs anymore. Otherwise, you could risk your developer program.
As far as I know, all you can do is open the iPhone settings in general (or get lead to your app settings if there are some. To do so you need the following code
guard let url = URL(string: UIApplication.openSettingsURLString) else {
// Handling errors that should not happen here
return
}
let app = UIApplication.shared
app.open(url)
By this, you will always get a URL you can use without any problems with apple review.
Until now you cannot access to bluetooth settings from your app from iOS 10.
you can see the following link to keep your mind at peace.
https://forums.developer.apple.com/message/146658#146658
Opening the Settings app from another app
Now that iOS 15 seemed to have broken auto-reconnect for known Bluetooth devices (other than audio gadgets), it's extremely annoying. If someone finds a solution, App Store-safe or not, I'm all ears.
We know an iOS app can connect to Wifi with CaptiveNetwork reference. As described in some related post: Connect WiFi Network via App.
Is there any similar library to help a Windows app to view exising wifi around and get connected?
Yes. There's the Windows.Devices.Wifi namespace. (Details here https://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.wifi.aspx?f=255&MSPPError=-2147217396 )
It offers Methods to list networks and a method called ConnectAsync() to connect. I once coded a sample here (it also covers other stuff): https://github.com/DanielMeixner/w10demoking/blob/master/Windows10DemoKing/wifi.xaml.cs
The magic lines of code are
using Windows.Devices.WiFi;
// create network adatper instance (see sample code in link above) ...
var nw = nwAdapter.NetworkReport.AvailableNetworks.Where(y => y.Ssid.ToLower() == "myssid").FirstOrDefault();
await nwAdapter.ConnectAsync(nw, WiFiReconnectionKind.Automatic);
I'm following this tutorial for finding locations on my j2me device. In the default codename1 mechanism, it tries to find it out through GPS. But my phone doesn't have it. So it opens the bluetooth connect screen. I'm using the following code.
com.codename1.location.LocationManager.getLocationManager().getCurrentLocationSync();
In the tutorial mentioned, we could change the retrieval mechanism to CELL-ID or Network, by doing the following.
//Specify the retrieval method to Online/Cell-ID
int[] methods = {(Location.MTA_ASSISTED | Location.MTE_CELLID | Location.MTE_SHORTRANGE | Location.MTY_NETWORKBASED)};
// Retrieve the location provider
provider = LocationUtil.getLocationProvider(methods, null);
Is there any way we could do a similar stuff in codename1 ??
We don't support other methods in J2ME devices at this point in time. You can use native interfaces to implement it.