Hope to find some guidance on this one soon, I've added reference for Windows IoT UWT in my project but still getting the following error ?
An exception of type 'System.TypeLoadException' occurred in test_led_alljoyn.exe but was not handled in user code
Additional information: Could not find Windows Runtime type 'Windows.Devices.Gpio.GpioController'.
Has anyone come across this issue while compiling applications for Raspberry Pi on Windows IoT core, on it's own one of my sample push button app works fine. Here's my code
public IAsyncOperation<testlightbulbSwitchResult> SwitchAsync(AllJoynMessageInfo info, bool interfaceMemberOn)
{
return (Task.Run(() =>
{
SwitchLED(interfaceMemberOn);
return testlightbulbSwitchResult.CreateSuccessResult();
}).AsAsyncOperation());
}
private void SwitchLED (bool state)
{
_ledState = state;
if (Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Devices.Gpio.GpioController"))
{
this.tController = GpioController.GetDefault();
if (this.tController == null)
{
//GpioStatus.Text = "There is no GPIO controller on this device.";
//return;
this.tPin = this.tController.OpenPin(5);
this.tPin.Write(GpioPinValue.High);
this.tPin.SetDriveMode(GpioPinDriveMode.Output);
}
this.tPin.Write(_ledState ? GpioPinValue.Low : GpioPinValue.High);
}
}
Solved. I had to set build platform target compile with .net native tool chain.
Related
I have this app that I did as a practice where I use the path_provider and sqflite. The problem is that when I am on debug mode, in emulator or actual device, even without asking for permission the app works well. However, when I install the "release" version, I get an error on the list that I populate. My hunch is that it is because there is something wrong with accessing the database so I added asking permission, still not working on "release" version. Kindly help enlighten.
#override
void initState() {
requestWritePermission();
super.initState();
}
requestWritePermission() async {
PermissionStatus permissionStatus = await SimplePermissions.requestPermission(Permission.WriteExternalStorage);
if (permissionStatus == PermissionStatus.authorized) {
setState(() {
_allowWriteFile = true;
});
}
}
I'm trying to request a permission at runtime for my app. I use a service provider to talk between the portable class and Android.
I start by calling this code on button press in the PCL:
using (new Busy(this))
{
var locationHelper = scope.Resolve<ILocationHelper>();
locationHelper.GetLocation(this);
}
This calls my Android level service:
public class AndroidLocationHelper : ILocationHelper, ILocationListener
{
readonly string[] PermissionsLocation =
{
Manifest.Permission.AccessCoarseLocation
};
const int RequestLocationId = 0;
public void GetLocation(SearchViewModel viewModel)
{
try
{
const string permission = Manifest.Permission.AccessCoarseLocation;
if (((int)Build.VERSION.SdkInt < 23) || (CheckSelfPermission(permission) == Permission.Granted))
{
}
else
RequestPermissions(PermissionsLocation, RequestLocationId);
}
catch (Exception ex)
{
Debug.WriteLine("Error while getting Location service");
Debug.WriteLine(ex.Message);
Messaging.AlertUser("There was an error with determining your location");
}
}
However, I get two errors on CheckSelfPermission and RequestPermissions. These two methods are only available to activities. The code works fine in MainActivity; however, I want to ask for permissions when the user hits a button, not in OnCreate or OnResume, etc.
Thanks for any help.
In your Android project, You can use this and use the Dependency Service to call it in Xamarin.Forms PCL project later:
var thisActivity = Forms.Context as Activity;
ActivityCompat.RequestPermissions(thisActivity, new string[] {
Manifest.Permission.AccessFineLocation }, 1);
ActivityCompat.RequestPermissions(thisActivity,
new String[] { Manifest.Permission.AccessFineLocation },
1);
You can try with ContextCompat.CheckSelfPermission, passing the application context, like this:
ContextCompat.CheckSelfPermission(Android.App.Application.Context, permission)
Update
In case of ActivityCompat.RequestPermissions, which requires an activity reference, you can keep track of the current activity. There is a very handy lib for that, called "CurrentActivityPlugin". You can find at https://github.com/jamesmontemagno/CurrentActivityPlugin
Rafael came up with a solution but I found another option that is a lot less effort just using MessagingCenter. In the MainActivity's OnCreate add a receiver that runs all the location code, that way you have access to all of the activities methods (and there are a bunch of tutorials on doing location services in MainActivity). Then add the Send inside of your service (the class).
To expound Rafael Steil's answer, I tried the suggested CurrentActivityPlugin and it worked on me. In my case I am trying to execute a voice call which needs CALL_PHONE permission. Here is the code snippet in your case: I used the ContextCompat & ActivityCompat so that I don't need to check the VERSION.SdkInt
using Plugin.CurrentActivity;
public void GetLocation(SearchViewModel viewModel){
var context = CrossCurrentActivity.Current.AppContext;
var activity = CrossCurrentActivity.Current.Activity;
int YOUR_ASSIGNED_REQUEST_CODE = 9;
if (ContextCompat.CheckSelfPermission(context, Manifest.Permission.AccessCoarseLocation) == (int)Android.Content.PM.Permission.Granted)
{
//Permission is granted, execute stuff
}
else
{
ActivityCompat.RequestPermissions(activity, new string[] { Manifest.Permission.AccessCoarseLocation }, YOUR_ASSIGNED_REQUEST_CODE);
}
}
It's dead simple
public bool CheckPermission()
{
const string permission = Manifest.Permission.ReceiveSms;
return ContextCompat.CheckSelfPermission(Forms.Context, permission) == (int) Permission.Granted;
}
I am trying to implement a simple notifier that will broadcast a message when the network connectivity changes in an app.
The problem I am having is that although the class returns the correct connection status when my code asks for it, the .SetNotification method of my networkreachability object does not get fired when the connection status changes.
Here is my connection status checking code, if anyone could help highlight what I have done wrong it would be much appreciated, thank you.
public event EventHandler ReachabilityChanged;
public NetworkStatus Status ()
{
if(_defaultRouteReachability == null)
{
_defaultRouteReachability = new NetworkReachability(new IPAddress(0));
}
_defaultRouteReachability.SetNotification(OnChange);
_defaultRouteReachability.Schedule(CFRunLoop.Current, CFRunLoop.ModeDefault);
_defaultRouteReachability.TryGetFlags (out _flags);
return ParseFlags ();
}
NetworkStatus ParseFlags ()
{
if (_flags == 0)
return NetworkStatus.NotReachable;
if (_flags.HasFlag(NetworkReachabilityFlags.ConnectionRequired) ||
_flags.HasFlag(NetworkReachabilityFlags.InterventionRequired) ||
_flags.HasFlag(NetworkReachabilityFlags.ConnectionOnDemand))
{
return NetworkStatus.NotReachable;
}
if (_flags.HasFlag (NetworkReachabilityFlags.TransientConnection) ||
_flags.HasFlag (NetworkReachabilityFlags.IsWWAN))
{
return NetworkStatus.ReachableViaCarrierDataNetwork;
}
return NetworkStatus.ReachableViaWiFiNetwork;
}
void OnChange(NetworkReachabilityFlags flags)
{
var h = ReachabilityChanged;
if (h != null)
h(null, EventArgs.Empty);
}
I can't say what's wrong with your approach, but I've done that a few days ago, so here's my working example:
https://thomasbandt.com/how-to-check-network-reachability-with-xamarinios-on-ios-8
You should try using ready Connectivity Plugin available in xamarin, really handy to use.
It is a Simple cross platform plugin to check connection status of mobile device, gather connection type, bandwidths, and more.
I am using Titanium sdk's openCamera function to capture an image and storing it to sdcard.
function captureImage() {
var capturedImg;
Titanium.Media.showCamera({
success : function(event) {
/* Holds the captured image */
capturedImg = event.media;
/* Condition to check the selected media */
if (event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO) {
var window1 = Project.AddDocumentSaveView.init(capturedImg, docImgModel);
window1.oldWindow = win;
Project.UI.Common.CommonViews.addWindowToTabGroup(window1);
activityInd.hide();
}
},
cancel : function() {
},
error : function(error) {
/* called when there's an error */
var a = Titanium.UI.createAlertDialog({
titleid : Project.StringConstant.IMP_DOCS_CAMERA
});
if (error.code == Titanium.Media.NO_CAMERA) {
a.setMessage(Project.StringConstant.IMP_DOCS_ERROR_WITH_CAMERA);
} else {
a.setMessage(Project.StringConstant.UNEXPECTED_ERROR + error.message);
}
a.show();
}
});
}
It works fine in iphone and even samsung galaxy s2. But on one device, Motorola Milestone device, the application crashes when the picture is accepted after capturing.
Here is the log while the device was attached : Log for camera crash
I tried so many times but couldnt find the issue .I think its some memory issue but i am not sure.
Could someone look into it and help me find what the issue is.
Any help/suggestions will be appreciated.
Thanks
everything in this block should be done after the camera is close
if (event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO) {
}
the camera is memory intensive and you are opening new windows and doing a bunch of other stuff... not good.
This is an aging issue on Titanium (TIMOB-12848
On some devices the native camera app (Titanium calls it using an Intent) cause Android to destroy our app.
When it tries to restart it, there's no recovering of the previous state so the intent callback is not called.
I've found a simple workaround to minimize this issue but doesn't resolve it. It just "mask" it somehow.
The workaround is discussed in the previous link and the full example code is here
i want to use ILspy debug a dll,as pic:
but it only can show two process:
but in vs2010,i can attach more process:
how to show w3wp.exe in ILspy? who can help me?
Running ILSpy as an administrator solved this problem for me.
From the ILSpy source code (ICSharpCode.ILSpy.Debugger.UI.AttachToProcessWindow):
Process currentProcess = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcesses()) {
try {
if (process.HasExited) continue;
// Prevent attaching to our own process.
if (currentProcess.Id != process.Id) {
bool managed = false;
try {
var modules = process.Modules.Cast<ProcessModule>().Where(
m => m.ModuleName.StartsWith("mscor", StringComparison.OrdinalIgnoreCase));
managed = modules.Count() > 0;
} catch { }
if (managed) {
list.Add(new RunningProcess {
ProcessId = process.Id,
ProcessName = Path.GetFileName(process.MainModule.FileName),
FileName = process.MainModule.FileName,
WindowTitle = process.MainWindowTitle,
Managed = "Managed",
Process = process
});
}
}
} catch (Win32Exception) {
// Do nothing.
}
}
Seems relatively straight forward...
It is preview software, so perhaps there is a flaw in this algorithm for determining if a process uses managed code.
You might be able to move pass this issue just by downloading the source code and changing
bool managed = false;
to
bool managed = true;
and recompiling.
I don't have the full version of IIS7 installed so I can't attempt to recreate your issue, but I doubt I would have the same problem anyways because my visual studio development server shows up fine in ILSpy while yours does not. Perhaps there is something different about your environment that messes with the above algorithm.
32-bit vs 64-bit might also play some role