Develop Reference

Wp 8.1 app crashing when its not connected to debugger

Application works when its connected to PC and run with debugger. The problem starts when I disconnect phone from PC, run app from phone and try to open gallery and set image to image control. I tried to write error in a file on try/catch but catch is never called, like there is no error on app executing.
This is code where i select img:
private async void galleryBtn_Click(object sender, RoutedEventArgs e)
{
try
{
FileOpenPicker filePicker = new FileOpenPicker();
filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
filePicker.ViewMode = PickerViewMode.Thumbnail;
// Filter to include a sample subset of file types
filePicker.FileTypeFilter.Clear();
filePicker.FileTypeFilter.Add(".bmp");
filePicker.FileTypeFilter.Add(".png");
filePicker.FileTypeFilter.Add(".jpeg");
filePicker.FileTypeFilter.Add(".jpg");
filePicker.PickSingleFileAndContinue();
view.Activated += viewActivated;
}
catch (Exception err)
{
string error = err.StackTrace.ToString();
await saveStringToLocalFile("test11", error);
}
}
And than it goes to :
private async void viewActivated(CoreApplicationView sender, IActivatedEventArgs args1)
{
try
{
FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs;
if (args != null)
{
if (args.Files.Count == 0) return;
view.Activated -= viewActivated;
StorageFile storageFile = args.Files[0];
var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
await bitmapImage.SetSourceAsync(stream);
var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
var obj = App.Current as App;
obj.ImageToEdit = bitmapImage;
obj.fileTransfer = storageFile;
checkTorch = -1;
await newCapture.StopPreviewAsync();
Frame.Navigate(typeof(EditImage));
}
}
catch (Exception err) {
string error = err.StackTrace.ToString();
await saveStringToLocalFile("test11", error);
}
}
When img is selected i open screen for image editing and run this
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
try
{
var obj = App.Current as App;
slika = obj.ImageToEdit;
original = obj.ImageToEdit;
ImagePreview.Source = slika;
RotateTransform myRotateTransform = new RotateTransform();
myRotateTransform.Angle = 0;
ImagePreview.RenderTransform = myRotateTransform;
var localSettings = ApplicationData.Current.LocalSettings;
}
catch (Exception err)
{
string error = err.StackTrace.ToString();
await saveStringToLocalFile("test11", error);
}
}
That is all, any advice is appreciated;

Problem was with my MediaCapture. First use mediaCapture.stopPreviewAsync(); to stop preview and than you must release the mediaCapture.
Before you call fileOpener use this code:
newCapture.Dispose();

In order to catch unhandled exceptions you can use a global exception catcher,
in App.xaml.cs file define:
public App()
{
this.InitializeComponent();
this.Suspending += this.OnSuspending;
this.UnhandledException += UnhandledExceptionHandler;
}
private void UnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs e)
{
log.Critical(e.Exception);
}
It's important to understand that not all exceptions can be caught using try\catch such as Corrupt State Exceptions:
https://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035
In this case you can debug the issue by viewing the .dmp file generated by your application found in: {Phone}\Documents\Debug

How to share a post multiple times in windows phone 8 application

I'm developing wp 8 application.
In my application I have Facebook share option.Every thing works correctly.
but problem is first time only post on wall option work . if i again click post on wall button post not working. it show me error In alert Box
Error Occurred :The Remote Server returned an error: NotFound
If i delete the already posted msg in fb wall.
Then I click again the post on wall it's work.
If msg is posted in wall then the code return above error msg in alert.
My Code For post on wall Button
private void BtnPostOnWall_Click(object sender, RoutedEventArgs e)
{
FacebookClient.Instance.PostMessageOnWall(TextToPost, new UploadStringCompletedEventHandler(PostMessageOnWallCompleted));
}
void PostMessageOnWallCompleted(object sender, UploadStringCompletedEventArgs e)
{
if (e.Cancelled)
return;
if (e.Error != null)
{
MessageBox.Show("Error Occurred: " + e.Error.Message);
return;
}
System.Diagnostics.Debug.WriteLine(e.Result);
string result = e.Result;
byte[] data = Encoding.UTF8.GetBytes(result);
MemoryStream memStream = new MemoryStream(data);
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(ResponseData));
ResponseData responseData = (ResponseData)serializer.ReadObject(memStream);
if (responseData.id != null && !responseData.id.Equals(""))
{
// Shared successfully
MessageBox.Show("Message Posted!");
}
else if (responseData.error != null && responseData.error.code == 190)
{
if (responseData.error.error_subcode == 463)
{
// need to get new token
FacebookClient.Instance.ExchangeAccessToken(new UploadStringCompletedEventHandler(ExchangeAccessTokenCompleted));
}
else
{
// need to clear the Access Token
FacebookClient.Instance.AccessToken = "";
SetLoggedInState(false);
}
}
else
{
// Error
}
}
How to resolve this error...

How delete file in localstorage on winrt?

i try whithout success to delete a file in my local storage. Exactly, i took a photo and i want to delete it later with a button for exemple. But when i click on the button, the app bugs and i have : "access denied".
I sude a simple Delet.Async() after i get the file in a StorageFile.
private async void delete_click(object sender, RoutedEventArgs e)
{
StorageFile filed = await ApplicationData.Current.LocalFolder.GetFileAsync("myImg.jpg");
if (filed != null)
{
await filed.DeleteAsync();
}
}

Try the code below to see if it works for you.
private async void takephoto_click(object sender, RoutedEventArgs e)
{
var ui = new CameraCaptureUI();
ui.PhotoSettings.CroppedAspectRatio = new Size(4, 3);
var file = await ui.CaptureFileAsync(CameraCaptureUIMode.Photo);
if (file != null)
{
// store the file
var myFile = await ApplicationData.Current.LocalFolder.CreateFileAsync("myImg.jpg");
await file.MoveAndReplaceAsync(myFile);
// display the file
var bitmap = new BitmapImage();
bitmap.SetSource(await file.OpenAsync(FileAccessMode.Read));
Photo.Source = bitmap;
}
}
private async void delete_click(object sender, RoutedEventArgs e)
{
StorageFile filed = await ApplicationData.Current.LocalFolder.GetFileAsync("myImg.jpg");
if (filed != null)
{
await filed.DeleteAsync();
}
StorageFile filefound = await ApplicationData.Current.LocalFolder.GetFileAsync("myImg.jpg");
if (filefound != null)
{
// do something here
}
}

i am having same problem in deleting file from local storage. there are many files stored in the local storage with different names so how to delete other files. in the above case you have hard coded the file name to delete.
StorageFile filefound = await ApplicationData.Current.LocalFolder.GetFileAsync("myImg.jpg");
instead of myImg.jpg user want to delte other file then how user will delete

/// <summary>
/// Delete the indicated application file
/// </summary>
/// <param name="strFilePathName">The file path name to delete</param>
/// <returns>True, if successful; else false</returns>
public async static Task<bool> DeleteAppFile(string strFilePathName)
{
try
{
StorageFile fDelete = null;
if (!strFilePathName.Equals(""))
{
fDelete = await ApplicationData.Current.LocalFolder.GetFileAsync(strFilePathName);
if (fDelete != null)
{
try
{
await fDelete.DeleteAsync();
}
catch (Exception ex)
{
AFFECTS.App.ShowMessage(true, "Error", "DeleteAppFile {" + strFilePathName + "}", ex.Message);
return false;
}
return true;
}
}
else
AFFECTS.App.ShowMessage(true, "Error", "DeleteAppFile", "File path name is empty.");
}
catch (Exception ex)
{
AFFECTS.App.ShowMessage(true, "Error", "DeleteAppFile {" + strFilePathName + "}", ex.Message);
}
return false;
}

Download and launch default app in windows phone 8 in C#

I am using Live api to download SkyDrive files.
My code has a download click event which triggers the OnDownloadedCompleted function.
OnDownloadedCompleted function copies the file to "filename".
and calls the DefaultLaunch(), which takes in the "filename" and tries to launch it by the default program in windows phone 8.
When i execute this code (The file downloaded is a OneNote file) OneNote opens and says that the file can't be open.
Can anyone please help me validate this code?
Thanks a lot!
private void btnDownload_Click(object sender, RoutedEventArgs e)
{
if (App.Current.LiveSession == null)
{
infoTextBlock.Text = "You must sign in first.";
}
else
{
LiveConnectClient client = new LiveConnectClient(App.Current.LiveSession);
client.DownloadCompleted += new EventHandler<LiveDownloadCompletedEventArgs>(OnDownloadCompleted);
client.DownloadAsync("file_id");
}
}
The code for OnDownloadCompleted is
void OnDownloadCompleted(object sender, LiveDownloadCompletedEventArgs e)
{
if (e.Result != null)
{
var filestream = File.Create(#"filename");
e.Result.Seek(0, SeekOrigin.Begin);
e.Result.CopyTo(filestream);
filestream.Close();
DefaultLaunch();
e.Result.Close();
}
else
{
infoTextBlock.Text = "Error downloading image: " + e.Error.ToString();
}
}
The code for Default launch function is
async void DefaultLaunch()
{
try
{
string imageFile = #"File.one";
var file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(imageFile);
var success = await Windows.System.Launcher.LaunchFileAsync(file);
if (success)
{}
else
{}
}
catch (Exception e)
{
Console.WriteLine(e.StackTrace);
Console.WriteLine(e.ToString());
}
}

try this tutorial.. http://msdn.microsoft.com/en-us/live/ff519582.aspx.. it is given there how to use live sdk in windows 8 platform

NAudio.MmException

I'm experimenting on how to play mp3 using Naudio. My simple app has one windows form and one button to play/pause the music. The app however has two major problem:
While it was intended that if the music is playing and the play button is pressed, the app should stop playing. Instead when the button is re-pressed, the app restart the music and then (sometime) throw an exception
If the button is pressed two or three times (and without any delay) ,the app throw a NAudio.MmException (Message=InvalidParameter calling acmStreamClose)
Can someone tell me what's wrong with my code? Below is my code:
using System;
using System.Windows.Forms;
namespace NaudioTesting
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private NAudio.Wave.BlockAlignReductionStream stream = null;
private NAudio.Wave.DirectSoundOut output = null;
public void LoadFile(string filePath)
{
DisposeWave();
if (filePath.EndsWith(".mp3"))
{
NAudio.Wave.WaveStream pcm =
NAudio.Wave.WaveFormatConversionStream.CreatePcmStream(new NAudio.Wave.Mp3FileReader(filePath));
stream = new NAudio.Wave.BlockAlignReductionStream(pcm);
}
else if (filePath.EndsWith(".wav"))
{
NAudio.Wave.WaveStream pcm = new NAudio.Wave.WaveChannel32(new NAudio.Wave.WaveFileReader(filePath));
stream = new NAudio.Wave.BlockAlignReductionStream(pcm);
}
else throw new InvalidOperationException("Not a correct audio file type.");
output = new NAudio.Wave.DirectSoundOut();
output.Init(stream);
output.Play();
}
private void playPauseButton_Click(object sender, EventArgs e)
{
string filePath = "GetLoud.mp3";
LoadFile(filePath);
if (output != null)
{
if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Pause();
else if (output.PlaybackState == NAudio.Wave.PlaybackState.Paused) output.Play();
}
}
private void DisposeWave()
{
try
{
if (output != null)
{
if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Stop();
output.Dispose();
output = null;
}
if (stream != null)
{
stream.Dispose();
stream = null;
}
}
catch (NAudio.MmException)
{
throw;
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DisposeWave();
}
}
}

Looking at the DirectSoundOut source, the implementation for Play and Pause doesn't support resuming. Namely, what happens to you is exactly what it should. Calling play will always start from begining of the stream.
You should use WaveOut instead. It supports resuming by calling Play again, just like what you have in your code.
output = new NAudio.Wave.WaveOut();