I am building a geofencing app on Windows Phone. The current version includes about 100 geofences, some of the overlap with others. I wrote a background task and set the trigger the entered state of a geofence. When I am out, testing my app, it occurs, that the background task does not react on geofences which overlap with others.
This is the code from the backround task:
public void Run(IBackgroundTaskInstance taskInstance)
{
var reports = GeofenceMonitor.Current.ReadReports();
var report = reports.FirstOrDefault(r => (r.Geofence.Id == "testID") && (r.NewState == GeofenceState.Entered));
if (report == null) return;
var toastXmlContent = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastText02);
var txtNodes = toastXmlContent.GetElementsByTagName("text");
txtNodes[0].AppendChild(toastXmlContent.CreateTextNode("Geofence entered!"));
txtNodes[1].AppendChild(toastXmlContent.CreateTextNode(report.Geofence.Id));
var toast = new ToastNotification(toastXmlContent);
var toastNotifier = ToastNotificationManager.CreateToastNotifier();
toastNotifier.Show(toast);
}
Does anybody know, how to handle overlapping geofences on Windows Phone?
Thank you
Related
I am using ZXing.Net.Mobile in my windows phone 8.1 app. It is using below reference:
ZXing.Net.Mobile.Core
zxing.portable
ZXingNetMobile
My Code :
var scanner = new MobileBarcodeScanner();
MobileBarcodeScanningOptions options = new MobileBarcodeScanningOptions();
options.TryHarder = true;
options.PossibleFormats.Add(ZXing.BarcodeFormat.CODE_128);
options.PossibleFormats.Add(ZXing.BarcodeFormat.CODE_39);
var result = await scanner.Scan(options);
if (result != null)
{
MessageDialog a = new MessageDialog(result.Text);
a.Content = result.Text;
a.ShowAsync();
}
Issue:
Am getting below issue whenever scan method executes.
Use the platform specific implementations instead at ZXing.Mobile.MobileBarcodeScanner.Scan(....
Is there any real time QR code scanner available for windows phone 8.1 ?
I created project based on:
https://github.com/Microsoft/real-time-filter-demo/tree/master/RealtimeFilterDemoWP
My question is how to enable flash light (torch) on WP8.1
Should I use MediaCapture() ?
var mediaDev = new MediaCapture();
await mediaDev.InitializeAsync();
var videoDev = mediaDev.VideoDeviceController;
var tc = videoDev.TorchControl;
if (tc.Supported)
{
if (tc.PowerSupported)
tc.PowerPercent = 100;
tc.Enabled = true;
}
when I used it it crash on
var videoDev = mediaDev.VideoDeviceController;
by unhandled exception
How to add flashlight to this sample project ?
You haven't initialized the MediaCaptureSettings, thus when you attempt to initialize the videoController the exception occurs. You need to initialize the settings, let MediaCapture know what device you'd like to use, and setup the VideoDeviceController. In addition, for Windows Phone 8.1 camera drivers, some require you to start the preview, or others require you to start video recording to turn on flash. This is due to the flash being tightly coupled with the camera device.
Here's some general code to give you the idea. *Disclaimer, this is untested. Best sure to call this in an async Task method so you can assure the awaited calls complete before you attempt to toggle the Torch Control property.
private async Task InitializeAndToggleTorch()
{
// Initialize Media Capture and Settings Objects, mediaCapture declared global outside this method
mediaCapture = new MediaCapture();
MediaCaptureInitializationSettings settings = new MediaCaptureInitializationSettings();
// Grab all available VideoCapture Devices and find rear device (usually has flash)
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
DeviceInformation device = devices.FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
// Set Video Device to device with flash obtained from DeviceInformation
settings.VideoDeviceId = device.Id;
settings.AudioDeviceId = "";
settings.PhotoCaptureSource = PhotoCaptureSource.VideoPreview;
settings.StreamingCaptureMode = StreamingCaptureMode.Video;
mediaCapture.VideoDeviceController.PrimaryUse = Windows.Media.Devices.CaptureUse.Video;
// Initialize mediacapture now that settings are configured
await mediaCapture.InitializeAsync(settings);
if (mediaCapture.VideoDeviceController.TorchControl.Supported)
{
// Get resolutions and set to lowest available for temporary video file.
var resolutions = mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoRecord).Select(x => x as VideoEncodingProperties);
var lowestResolution = resolutions.OrderBy(x => x.Height * x.Width).ThenBy(x => (x.FrameRate.Numerator / (double)x.FrameRate.Denominator)).FirstOrDefault();
await mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoRecord, lowestResolution);
// Get resolutions and set to lowest available for preview.
var previewResolutions = mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties (MediaStreamType.VideoPreview).Select(x => x as VideoEncodingProperties);
var lowestPreviewResolution = previewResolutions.OrderByDescending(x => x.Height * x.Width).ThenBy(x => (x.FrameRate.Numerator / (double)x.FrameRate.Denominator)).LastOrDefault();
await mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, lowestPreviewResolution);
// Best practice, you should handle Media Capture Error events
mediaCapture.Failed += MediaCapture_Failed;
mediaCapture.RecordLimitationExceeded += MediaCapture_RecordLimitationExceeded;
}
else
{
// Torch not supported, exit method
return;
}
// Start Preview
var captureElement = new CaptureElement();
captureElement.Source = mediaCapture;
await mediaCapture.StartPreviewAsync();
// Prep for video recording
// Get Application temporary folder to store temporary video file folder
StorageFolder tempFolder = ApplicationData.Current.TemporaryFolder;
// Create a temp Flash folder
var folder = await tempFolder.CreateFolderAsync("TempFlashlightFolder", CreationCollisionOption.OpenIfExists);
// Create video encoding profile as MP4
var videoEncodingProperties = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto);
// Create new unique file in the Flash folder and record video
var videoStorageFile = await folder.CreateFileAsync("TempFlashlightFile", CreationCollisionOption.GenerateUniqueName);
// Start recording
await mediaCapture.StartRecordToStorageFileAsync(videoEncodingProperties, videoStorageFile);
// Now Toggle TorchControl property
mediaCapture.VideoDeviceController.TorchControl.Enabled = true;
}
Phew! That's a lot of code just to toggle flash huh? Good news is this is fixed in Windows 10 with new Windows.Devices.Lights.Lamp API. You can do same work in just a few lines of code:
Windows 10 Sample for Windows.Devices.Lights.Lamp
For reference, check this thread:
MSDN using Win8.1 VideoDeviceController.TorchControl
I am trying to experiment with downloading files on a regular basis with background tasks for windows store applications, and am having trouble.
I followed the sample at https://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh977055.aspx, and even downloaded/ran it and everything worked perfectly (including being able to step into the timer background task).
So with that I created my own background task in a brand new Windows namespace
Win8BackgroundTest
{
public class TestBackgroundTask
{
public async void Run(IBackgroundTaskInstance taskInstance)
{
var deferral = taskInstance.GetDeferral();
var uri = new Uri("http://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_h264.mov");
var folder = ApplicationData.Current.LocalFolder;
var downloadFile = await folder.CreateFileAsync(uri.Segments.Last(), CreationCollisionOption.GenerateUniqueName);
var dataFile = await folder.CreateFileAsync("downloadData", CreationCollisionOption.GenerateUniqueName);
var downloader = new BackgroundDownloader();
var operation = downloader.CreateDownload(uri, downloadFile);
await FileIO.WriteTextAsync(dataFile, "Success at " + DateTime.Now);
deferral.Complete();
}
public static async void RegisterTask()
{
const string taskName = "TestBackgroundTask";
try
{
var status = await BackgroundExecutionManager.RequestAccessAsync();
if (status == BackgroundAccessStatus.Denied)
{
return;
}
}
catch
{
// already accepted
}
var tasks = BackgroundTaskRegistration.AllTasks
.Where(x => x.Value.Name == taskName)
.ToArray();
if (tasks.Any())
{
return;
}
var builder = new BackgroundTaskBuilder
{
Name = taskName,
TaskEntryPoint = "Win8BackgroundTest.TestBackgroundTask",
};
builder.SetTrigger(new TimeTrigger(60, false));
var registeredTask = builder.Register();
}
}
}
I set up the application's manifest with a Background Tasks declaration, checking the Timer properties checkbox, and set the EntryPoint to Win8BackgroundTest.TestBackgroundTask.
I then added the following at the end of my App.xaml.cs's OnLaunched() method:
TestBackgroundTask.RegisterTask();
Stepping through seems to have task registration work successfully with no exceptions. I then go back to visual studio, added a breakpoint to the first line in my task's Run() method, I then go to the debug locations toolbar, click the down arrow and select TestBackgroundTask. A few seconds later visual studio exits (as does my app).
Does anyone see what I am doing wrong that is causing background tasks to fail?
So after much frustration and a lot of trial and error the issue was a combination of both of the comments.
So first of all, it appears like you cannot have a background task in the same project as the rest of your windows store application. It must be in it's own windows runtime component project.
Finally, there are times where it just doesn't work and for whatever reason deleting the bin and obj folders fix it.
I have problem with initialization camera on Windows Universal Apps. This code works and never throw any exception, but i have wrapped it into dialog control. Problem is sometimes (1/10 dialog openings) i don't see preview from camera. Have you any idea how to fix that or at least check if preview is displayed?
private async Task InitCameraAsync()
{
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
var backCam = devices.FirstOrDefault(q => q.EnclosureLocation != null && q.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
var mediaCapture = new MediaCapture();
if (backCam != null)
{
await mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings()
{
VideoDeviceId = backCam.Id,
AudioDeviceId = String.Empty,
StreamingCaptureMode = StreamingCaptureMode.Video,
PhotoCaptureSource = PhotoCaptureSource.VideoPreview
});
}
else
{
await mediaCapture.InitializeAsync();
}
CameraControl.Source = mediaCapture;
SetImageEncodingProperties(); // get encoding properties to save images
await SetPreviewResolutionAsync();
await CameraControl.Source.StartPreviewAsync();
}
}
Are you sure that you are calling the function from the UI thread to access the camera for the API to run reliably?
https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.core.coredispatcher.runasync.aspx
Im beginner in Flex mobile application , my issue is the app restart then i used PersistenceManager to solve it, but when i take an image with camera i cannot hold the image if the app restart then how to hold all image captured when user click to save button i think it will be in the imagecaptured method but it doesn't work the app restarted and camera app is opened to take image method is
public function imagecaptured(event:MediaEvent):void
{
//submitButton.enabled = false;
antherImg.label = "please wait to detect your location";
imagepromise = event.data;
imgBorder.source = imagepromise.file.url;
//values to send
var imgURL:Object = imagepromise.file.url;
var imgName:Object = imagepromise.relativePath;
//save Persistence
var saveManager:PersistenceManager = new PersistenceManager();
saveManager.setProperty("url", imagepromise.file.url);
saveManager.setProperty("name", imagepromise.relativePath);
}
and when page creation (creationComplete)
public var loadManager:PersistenceManager = new PersistenceManager();
if(loadManager.load())
{
var savedData:Object = saveManager.getProperty("url");
var savedData:Object = saveManager.getProperty("name");
}
Please help , Thanks in advance