System.NullReferenceException pour affichage caméra

Bonjour,

Je dois afficher l'image d'une cam via une appli wpf. J'ai trouvé sur http://easywebcam.codeplex.com/ un exemple qui le fait et affiche très bien.

Quand je veux l'adapter à mon code celà ne fonctionne pas et lorsque je clique sur bouton start ou stop, cela m'engendre une erreur "System.NullReferenceException" Et je ne vois pas d'où cela peut venir. Je vois joins le code correspondant.
partie xaml :

Code:

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Background="#FF404040" BorderThickness="1" Padding="0" Width="42.333" HorizontalAlignment="Left" Margin="513.667,162,0,359"> <WrapPanel Margin="2,19.5,-1,7" > <Image Width="30" Height="30" Source="Resources\appbar.lightbulb.hue.on.png" Stretch="Fill" Margin="5,3"/> <Slider Width="31" Height="167" Orientation="Vertical" Margin="5,3"/> <Image Width="30" Height="30" Source="Resources\appbar.lightbulb.hue.png" Stretch="Fill" Margin="5,3" RenderTransformOrigin="0.667,8.35"/>   </WrapPanel> </Border> <Border CornerRadius="10" BorderBrush="Gray" Background="#FF404040" BorderThickness="1" Padding="0" Height="34" Width="226" HorizontalAlignment="Left" Margin="-315,0,0,352" VerticalAlignment="Bottom"> <WrapPanel Margin="2,0,7,-11" Height="43" >   <Image Width="30" Height="30" Source="Resources\appbar.lightbulb.hue.png" Stretch="Fill" Margin="0,0,3,0"/> <Slider Width="136" Height="23"/> <Image Width="30" Height="30" Source="Resources\appbar.lightbulb.hue.on.png" Stretch="Fill" Margin="5,0,0,0"/>   </WrapPanel> </Border> <Border CornerRadius="10" BorderBrush="Gray" Background="#FF404040" BorderThickness="1" Padding="0" Width="42.333" HorizontalAlignment="Left" Margin="513.667,86,0,0" VerticalAlignment="Top" Height="46.333"> <WrapPanel Margin="0,-1,7,7" HorizontalAlignment="Right" > <visualizationToolkit:Title Content="SAT" Canvas.Left="120" FontStyle="Italic" FontWeight="Bold"/>     <Image Source="C:\Users\Anthony kamax\Downloads\Icones\boule-rouge-icone-7914-32.png" Height="24" Width="24" /> </WrapPanel> </Border> <Border CornerRadius="10" BorderBrush="Gray" Background="#FF404040" BorderThickness="1" Padding="0" Width="42" HorizontalAlignment="Left" Margin="-84,0,0,352" VerticalAlignment="Bottom" Height="46"> <WrapPanel Margin="0,-1,7,7" HorizontalAlignment="Right" > <visualizationToolkit:Title Content="SAT" Canvas.Left="120" FontStyle="Italic" FontWeight="Bold"/>     <Image Source="boule-rouge-icone-7914-32.png" Height="24" Width="24" /> </WrapPanel> </Border>   </Grid>   </Grid> </Window>

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et le code vb.net :

Code:

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Imports System Imports System.IO Imports System.Linq Imports System.Collections.Generic Imports System.Collections.ObjectModel Imports System.Text   Imports System.Windows.Threading Imports System.Windows.Media.Animation Imports System.Threading Imports System.Windows.Resources Imports System.Reflection Imports WebCam_Capture     Imports System.Windows Imports System.Windows.Controls           Class Window1   Private webcam As WebCam Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) webcam = New WebCam() webcam.InitializeWebCam(imgVideo) End Sub   Private Sub bntStart_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) webcam.Start() End Sub   Private Sub bntStop_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) webcam.Stop() End Sub   Private Sub bntContinue_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) webcam.Continue() End Sub End Class

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Merci d'avance pour votre aide

La méthode Window_Loaded n'est pas associée à l'évènement Loaded de la fenêtre, donc elle n'est jamais appelée, et donc la variable webcam n'est jamais initialisée, ce qui cause l'exception quand tu essaies d'appeler une méthode dessus.

Il manque ça dans ton XAML sur l'élément Window :

Code:

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Loaded="Window_Loaded"

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Citation:

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Envoyé par SkaknYoshi

je ne vois pas d'où cela peut venir

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Voilà un mini cours de débogage pour que tu ne sois pas bloqué la prochaine fois ;)

Cette exception (NullReferenceException) a toujours la même cause : tu as essayé d'accéder à un membre (méthode, propriété, champ ou évènement) d'une variable qui vaut Nothing (généralement parce que tu as oublié de l'initialiser)

Normalement, le débogueur suspend l'exécution et place le curseur sur la ligne qui pose problème, tu peux donc regarder la valeur des variables pour voir celle qui pose problème. Si tu penses avoir initialisé cette variable, mets un point d'arrêt à l'endroit où tu l'initialises, et relance l'exécution. Si le débogueur ne s'arrête pas sur le point d'arrêt, c'est que ce code n'a pas été exécuté... Reste juste à trouver pourquoi ;)

Ok merci bien,

J'ai eu peur, ça fonctionnait pas lors de mes premières tentatives, j'ai relancé projet et cela fonctionne désormais.

Le débogueur m'emmenait directement sur webcam.start et j'avais bien vu que dans webcam il y avait nothing, mais j'ai pas pensé à vérifier le lancement de Window_Loaded

Il y a un petit moment que je n'avais pas fait de dév et je n'ai pas toujours les "réflexes"

En tout cas encore merci