I have Lumia 830 and i've tried to create flashlight app in UWP C#. my device Flashlight works great but i don't know why i can't create my own app turn on / off Torch of my phone.
I use Lamp class :
var lamp = await Lamp.GetDefaultAsync();
if (lamp == null)
{
ShowErrorMessage("No Lamp device found");
return;
}
lamp.IsEnabled = true;
when run this code on my phone "lamp" is null and it couldn't find my FlashLED. I've got this code from MSDN.Microsoft.com and thay said
If the returned object is null, the Lamp API is unsupported on the
device. Some devices may not support the Lamp API even if there is a
lamp physically present on the device.
This class doesn't work on my Lumia 830 i don't kno why? :(
also i use this code :
var mediaDev = new MediaCapture();
await mediaDev.InitializeAsync();
var videoDev = mediaDev.VideoDeviceController;
var tc = videoDev.TorchControl;
if (tc.Supported)
{
// But wait, for this to work with Blue camera drivers, we have to Start a recording session
// Create video encoding profile as MP4
var videoEncodingProperties = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Vga);
// Start Video Recording
var videoStorageFile = await KnownFolders.VideosLibrary.CreateFileAsync("tempVideo.mp4", CreationCollisionOption.GenerateUniqueName);
await mediaDev.StartRecordToStorageFileAsync(videoEncodingProperties, videoStorageFile);
// Turn on Torch
mediaDev.VideoDeviceController.TorchControl.Enabled = true;
}
this code works and my FlashLED turn on but it record video and it take's user SD Card memory.
please help me if you know there is best way to turn on/off Torch or FlashLED.
thanks in advance
Hussein Habibi Juybari
The Lamp API is designed for Windows 10 devices only and you can only use it on devices which support the API. Currently supported devices are 950/950XL, 650, and 550. Older devices will not be updated to support this API. You should fall back to the Windows 8.1 method of turning on flash when you detect that the lamp device is not available on older devices.
From: https://wpdev.uservoice.com/forums/110705/suggestions/15846967
Please test default sample named LampDevice (cf. https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/LampDevice). Do you have the same behavior ? I just tested on Lumia 930 it works fine. No Lumia 830 to test it.
Related
I've installed the Microsoft Teams(work or school / version 1.6.00.1381 ) app on Win 11.
I'd like to detect whether microphone within a call is muted or not.
I found this https://stackoverflow.com/questions/67569705/get-current-call-status-of-microsoft-teams ,
someone said : Currently there is no api to get the current microphone state within a call.
Now I have a workaround to know the microphone status on Teams by NAudio
step1: set mute/unmute
using var deviceEnumerator = new MMDeviceEnumerator();
var devices = deviceEnumerator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active);
_isMicMuted = !_isMicMuted;
foreach (var device in devices)
{
device.AudioEndpointVolume.Mute = _isMicMuted;
}
step2: get microphone status
devices.Any(x => x.AudioEndpointVolume.Mute);
This way will fail because when user manually press unmute/mute mic button,
it didn't change device.AudioEndpointVolume.Mute value.
enter image description here
is there any other way do this?
I am using Lecia Disto e7100i which basically measures distance and area using laser. This device has bluetooth and can be paired with windows.
I am trying to develop an wpf app that reads the mesaured data using c#
There is no sdk that comes along with the device.
I have tried to use 32feet.Net but since there is no proper documentation I don't know where to start.
Is there any way that I can do to solve my problem?
This is not a full response, instead its more of a guideline on how to resolve your issue:
Pair the device with your Computer
Run the included software that displays the data somehow
Use WireShark to analyze the traffic
see if it is a standard protocol type or something custom
understand the protocol and reimplement it using c# and BluetoothSockets
To get started, you can try:
var client = new BluetoothClient();
// Select the bluetooth device
var dlg = new SelectBluetoothDeviceDialog();
DialogResult result = dlg.ShowDialog(this);
if (result != DialogResult.OK)
{
return;
}
BluetoothDeviceInfo device = dlg.SelectedDevice;
BluetoothAddress addr = device.DeviceAddress;
Console.WriteLine(device.DeviceName);
BluetoothSecurity.PairRequest(addr, "PIN"); // set the pin here or take user input
device.SetServiceState(BluetoothService.HumanInterfaceDevice, true);
Thread.Sleep(100); // Precautionary
if (device.InstalledServices.Length == 0)
{
// handle appropriately
}
client.Connect(addr, BluetoothService.HumanInterfaceDevice);
Also make sure that
Device appears in "Bluetooth devices" in the "Control panel".
Device is HID or change code accordingly.
Hope it helps. Cheers!
Try this demo project, and the following articles after that one.
Try to follow this tutorial
Here you can see a direct answer by the mantainer of 32feet, with which you can get in touch
Check also this answer
Hello I displayed 1 webcam preview in UWP and that was a success.
But now I want to use 2 camera's preview on my program or be able to choose between the two cameras while connected 2 cameras on computer.
When I run 1 webcam preview, I referred to documentation on using MediaCapture and it was good.
But now I don't know how to display 2 camera previews or select a one between cameras.
Is it impossible?
Yes, it is possible :-) . The MediaCapture class takes the default camera when you call the InitializeAsync method without parameters, but there is another overload that allows you to specify the device ID.
The documentation shows how to discover video capture devices:
DeviceInformationCollection devices =
await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
Now you can initialize multiple MediaCapture instances like this:
foreach ( var device in devices )
{
var mediaInitSettings =
new MediaCaptureInitializationSettings { VideoDeviceId = device.Id };
MediaCapture mediaCapture = new MediaCapture();
mediaCapture.InitializeAsync(mediaInitSettings);
//do something with the media capture
}
Naturally, when you want to display multiple previews, you will need to have multiple CaptureElements, each set to the specific MediaCapture instance you want.
However this approach is quite simplified. To make sure the concurrent capture and preview is supported, you must first ensure to query only cameras that support device profile using MediaCapture.IsVideoProfileSupported method as shown in the documentation and then also check find a concurrency-enabled profile common for both cameras - MediaCapture.FindConcurrentProfiles, see docs. Only then you can safely create the two previews and know the app will not crash.
I'd like to play a soundfile from the speakers integrated in the laptop, even if an additional speaker is connected via the headphone jack (but it's not listed in the sound device list).
I've had a look at How can I make the computer beep in C#? and How to beep using PC speaker? and have understood that the beep driver was removed in windows 7.
However, I do not want to use this extremely simple integrated speaker controlled by the removed driver, but the normal one present in most modern laptops.
Unfortunately, when I connect my external speakers, they do not show up as an additional device. When I run this code (using NAudio), I always get just one result, and it's the same whether the external speakers are connected or not:
var enumerator = new MMDeviceEnumerator();
foreach (var endpoint in enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active))
{
Console.WriteLine(endpoint.FriendlyName);
}
Is it possible to play a sound on the normal laptop speaker, while an external speaker is connected?
Edit:
I don't think my question is a duplicate of Play a sound in a specific device with C#
I don't see an additional device when I connect my external speakers, so I guess my laptop doesn't have multiple sound cards (how can I verify?).
The solution from the other question (waveOut.DeviceNumber = deviceNumber;) doesn't work for me neither. When I choose deviceNumber = 0;, the sound comes from my external speaker if it's connected. If I set deviceNumber = 1; (while it's connected) I get a MmException
I see I'm a bit late for the party but i was working on something similar and got to this solution.
Hope it helps someone in the future :)
var enumerator = new MMDeviceEnumerator();
IWavePlayer waveOut = new WasapiOut();
foreach (var endpoint in enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active))
{
if (endpoint.FriendlyName == "Name of the device you want")
{
waveOut = new WasapiOut(
endpoint, AudioClientShareMode.Exclusive, false, 0);
AudioFileReader wave = new AudioFileReader("Audio Name");
waveOut.Init(wave);
waveOut.Play();
break;
}
}
Update: This may not be "Pairing". This may just need to have a service started and bound to a port. However, this code is not storing it either. I need the device to be stored even after the application is closed.
I am building a program specifically suited for Zebra RW 420's on a Windows Mobile 6 Handheld device. The application needs to allow a mobile device to pair with the printer on COM1. I believe I am very close to getting it, but I can't get the pair request to work.
I am able to communicate with the printer and even print by directly connecting and printing, but I can't get the mobile device to actually pair with it. I've tried a variation of pins to include null, "1", "0000", and "1234". No matter what, the method always returns false. Any suggestions or ideas why this might be failing? I can pair the device just find in the WM6 Bluetooth menu, but not in my application.
It might be important to note that the little light bulb icon on the printer comes on when the program says it is attempting to pair, but after about 5 to 10 seconds, it fails.
BluetoothSecurity.PairRequest(device, "1"))
Additional Information:
I've successfully paired with my Android phone using this code.
I then logged in and set a PIN on the Zebra printer. However, this code still fails to pair with the printer even when I know the pin is correct / set in the printer.
From https://km.zebra.com/kb/index?page=answeropen&type=open&searchid=1336682809706&answerid=16777216&iqaction=5&url=https%3A%2F%2Fkm.zebra.com%2Fkb%2Findex%3Fpage%3Dcontent%26id%3DSO8031%26actp%3Dsearch%26viewlocale%3Den_US&highlightinfo=6292341,26,43#
Zebra Bluetooth enabled mobile printers are 'slave' devices only. The printers will pair with any 'master' device that tries to make a valid connection. Since only a master device can initiate a connection, the printer does not store pairing data, that function is always done on the master device. The printer can only be connected to one master device at a time, but any number of master devices that have stored pairing information for the printer would be able to initiate a connection to the printer without having to rediscover it.
I'm guessing that this means the InTheHand.Net BluetoothSecurity.PairRequest might not work for this type of pairing?
In the Bluetooth section of the WM handheld, under the "Devices" tab, I can add the device. I need to essentially do that. I need to register the device in that list and then set it to use COM 1 in the "COM Ports" section. The application I am using doesn't actually print. It's sole purpose is to prepare the printer for other applications.
The quote from Zebra make it sounds as pairing is actually not required at all. Are you printing from your app? If so just connect to the SPP service and send the text.
BluetoothAddress addr = ...
Guid serviceClass;
serviceClass = BluetoothService.SerialPort;
var ep = new BluetoothEndPoint(addr, serviceClass);
var cli = new BluetoothClient();
cli.Connect(ep);
Stream peerStream = cli.GetStream();
peerStream.Write ...
(From General Bluetooth Data Connections)
The Zebra Mobile Printer needed to be properly configured before pairing with this method will work. Here is what I did:
First, I ran the following commands on the printer:
.
! U1 setvar "bluetooth.authentication" "setpin"
! U1 getvar "bluetooth.authentication"
! U1 getvar "bluetooth.enable"
! U1 getvar "bluetooth.discoverable"
! U1 setvar "bluetooth.bluetooth_pin" "0000"
! U1 getvar "bluetooth.bluetooth_pin"
Then, the application with this code ran successfully.
.
int pair_req = 0;
try
{
if (BluetoothSecurity.SetPin(device, "0000")) {
while (status == false && pair_req < 3)
{
++pair_req;
status_box.Text = status_box.Text + '\n' + "Attempt " + pair_req.ToString();
status_box.Update();
if (BluetoothSecurity.PairRequest(device, "0000"))
{
status = true;
client.Refresh();
status_box.Text = "Paired Successfully.";
status_box.Update();
Thread.Sleep(5000);
}
else
{
status = false;
}
}
}
}
catch (ArgumentNullException e)
{
status_box.Text = "Pair failed.";
status_box.Update();
Thread.Sleep(5000);
}
status_box.Update();
Thread.Sleep(400);