Hi,
I have a page of main screen(consist of video playing and image changing after video is finish so-called advertisement page). Currently my application facing hang or freeze if the main screen is left idle and loop more than 10 times.
And while freeze, if public touch again the screen, it will become semi-transparent white with windows dialog of application is not responding. At the dialog, there is error stated "AppHangB1" when expand the details.
My current code for this is at page loaded, it will play video first. After mediaended, image ads will display and dispatchertimer will start. When dispatchertimer_tick, it will change to next image. After image show to the end, it will play back the media and keep repeat the same process. I'm noticed that while the application is left idle, the video and image changing quite look slow, and when touch, it will appear dialog like above paragraphs.
I have search for AppHangB1 problem, it said about running UI Thread. I don't know the details since I'm not open yet to UI Thread deeply. Below are my code currently.
Private Sub my_media_MediaFailed(ByVal sender As Object, ByVal e As System.Windows.ExceptionRoutedEventArgs) Handles my_media.MediaFailed
Try
App.LogEvents("[" & strlogpage & "] Media failed to play.", EventLogEntryType.Information)
Catch ex As Exception
App.LogEvents("[" & strlogpage & "] Error occurred in my_media_MediaFailed: " & ex.Message, EventLogEntryType.Error)
End Try
End Sub
Private Sub my_media_MediaOpened(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles my_media.MediaOpened
Try
App.LogEvents("[" & strlogpage & "] Media opened", EventLogEntryType.Information)
If Not (IsNothing(my_media)) Then
my_media.Play()
Else
MakeInstanceAgain()
End If
Catch ex As Exception
App.LogEvents("[" & strlogpage & "] Error occurred in my_media_MediaOpened: " & ex.Message, EventLogEntryType.Error)
End Try
End Sub
Private Sub my_media_MediaEnded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles my_media.MediaEnded
Dim imageContent As Byte()
Try
Me.Focus()
If arr_ads.Count = 0 Then
If Not (IsNothing(my_media)) Then
If my_media.Position <> TimeSpan.Zero Then
my_media.Stop()
End If
my_media.Source = Nothing
my_media.Source = New Uri(load_vids, UriKind.RelativeOrAbsolute)
my_media.Position = TimeSpan.Zero
Else
MakeInstanceAgain()
End If
Else
If Not (IsNothing(my_media)) Then
my_media.Stop()
my_media.Source = Nothing
Else
MakeInstanceAgain()
End If
ImagePointer = 0
myimages.Visibility = Windows.Visibility.Visible
myvideo.Visibility = Windows.Visibility.Hidden
imageContent = Nothing
imageContent = arr_ads.Item(ImagePointer)
Dim photo As New BitmapImage()
Dim mstream As System.IO.MemoryStream
If Not (IsNothing(imageContent)) Then
mstream = New System.IO.MemoryStream(imageContent)
photo.BeginInit()
photo.StreamSource = mstream
photo.CacheOption = BitmapCacheOption.OnLoad
photo.EndInit()
img1.Source = photo
img1.Stretch = Stretch.Fill
mstream = Nothing
End If
img2.Source = Nothing
ScreenTimer.Start()
End If
Catch ex As Exception
App.LogEvents("[" & strlogpage & "] Error occurred In MediaAdvert_MediaEnded: " & ex.ToString, EventLogEntryType.Error)
End Try
End Sub
Private Sub ScreenTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ScreenTimer.Tick
Dim s As Storyboard
Dim imageContent As Byte()
Try
Me.IsEnabled = False
ScreenTimer.Stop()
If Not (IsNothing(arr_ads)) Then
If arr_ads.Count > 0 Then
If ImagePointer = arr_ads.Count - 1 Then
ImagePointer = 0
If load_vids = String.Empty Then
imageContent = Nothing
imageContent = arr_ads.Item(ImagePointer - 1)
Dim photo As New BitmapImage()
Dim mstream As System.IO.MemoryStream
If Not (IsNothing(imageContent)) Then
mstream = New System.IO.MemoryStream(imageContent)
photo.BeginInit()
photo.StreamSource = mstream
photo.CacheOption = BitmapCacheOption.OnLoad
photo.EndInit()
img1.Source = photo
img1.Stretch = Stretch.Fill
mstream = Nothing
End If
imageContent = Nothing
imageContent = arr_ads.Item(ImagePointer)
Dim photo2 As New BitmapImage()
Dim mstream2 As System.IO.MemoryStream
If Not (IsNothing(imageContent)) Then
mstream2 = New System.IO.MemoryStream(imageContent)
photo2.BeginInit()
photo2.StreamSource = mstream2
photo2.CacheOption = BitmapCacheOption.OnLoad
photo2.EndInit()
img2.Source = photo2
img2.Stretch = Stretch.Fill
mstream = Nothing
End If
Me.IsEnabled = True
ScreenTimer.Start()
Else
ScreenTimer.Stop()
MediaPointer = 0
myvideo.Visibility = Windows.Visibility.Visible
myimages.Visibility = Windows.Visibility.Hidden
If Not (IsNothing(my_media)) Then
my_media.Source = Nothing
my_media.Source = New Uri(load_vids, UriKind.RelativeOrAbsolute)
my_media.Position = TimeSpan.Zero
Else
MakeInstanceAgain()
End If
Me.IsEnabled = True
End If
Else
imageContent = Nothing
imageContent = arr_ads.Item(ImagePointer)
Dim photo As New BitmapImage()
Dim mstream As System.IO.MemoryStream
If Not (IsNothing(imageContent)) Then
mstream = New System.IO.MemoryStream(imageContent)
photo.BeginInit()
photo.StreamSource = mstream
photo.CacheOption = BitmapCacheOption.OnLoad
photo.EndInit()
img1.Source = photo
img1.Stretch = Stretch.Fill
mstream = Nothing
End If
ImagePointer = ImagePointer + 1
imageContent = Nothing
imageContent = arr_ads.Item(ImagePointer)
Dim photo2 As New BitmapImage()
Dim mstream2 As System.IO.MemoryStream
If Not (IsNothing(imageContent)) Then
mstream2 = New System.IO.MemoryStream(imageContent)
photo2.BeginInit()
photo2.StreamSource = mstream2
photo2.CacheOption = BitmapCacheOption.OnLoad
photo2.EndInit()
img2.Source = photo2
img2.Stretch = Stretch.Fill
mstream = Nothing
End If
Me.IsEnabled = True
ScreenTimer.Start()
End If
Else
ScreenTimer.Stop()
End If
End If
Catch ex As Exception
App.LogEvents("[" & strlogpage & "] Error occurred at screen timer tick: " & ex.ToString, EventLogEntryType.Error)
ScreenTimer.Start()
End Try
End Sub
Private Sub btn_touch_Click(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles btn_touch.Click
Try
Me.IsEnabled = False
ScreenTimer.Stop()
If Not (IsNothing(my_media)) Then
my_media.Stop()
my_media.Position = TimeSpan.Zero
my_media.Close()
my_media.Source = Nothing
End If
App.LogEvents("[" & strlogpage & "] Touch detected. Navigating to welcome page.", EventLogEntryType.Information)
Dim pagename As New PageWelcome
NavigationService.Navigate(pagename)
Catch ex As Exception
strMsg = "[" & strlogpage & "] Error at touchdown navigate. Ex:" & ex.Message
App.LogEvents(strMsg, EventLogEntryType.Error)
End Try
End Sub
QUESTION:-
Can I run a backgroundworker/dispatcher/any thread which inside it, it will start a timer/dispatchertimer and keep repeating it inside thread so UI is open to have any response such as touch so when public is touching the screen, I just send the CancelAsync. Any idea?
What I have tried:
Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, New Action(Function() Me.progressBar.Value = 50)) get from discussion and forum as sample but hang there because I don't know how to proceed.
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