System.NullReferenceException pour affichage caméra

**SkaknYoshi** · 28/01/2014, 16h23

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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                <Button x:Name="bntStart" Content="Start" Click="bntStart_Click" />
                <Button x:Name="bntStop" Content="Stop" Margin="10,0,0,0" Click="bntStop_Click" />
                <Button x:Name="bntContinue" Content="Continue" Margin="10,0,0,0" Click="bntContinue_Click" />
            </StackPanel>
            <Border CornerRadius="10"
				BorderBrush="Gray"
				Background="#FF404040"
				BorderThickness="1"
				Padding="0" Height="216.8" Width="294.5" Canvas.Left="8" Canvas.Top="537">
 
                <Canvas Margin="0,0,0,-46">
                    <visualizationToolkit:Title Content="Sample parameters" Canvas.Left="64" FontStyle="Italic" FontWeight="Bold"/>
                    <TextBlock Width="160" Height="20.04" Canvas.Top="31.96" TextWrapping="Wrap"><Run Text="T"/><Run Text="hick of histological section"/><Run Text=" :"/></TextBlock>
                    <TextBlock Width="93" Height="20.04" Canvas.Top="54.96" TextWrapping="Wrap"><Run Text="Sample Number"/><Run Text=" :"/></TextBlock>
                    <TextBlock Width="83" Height="20.04" Canvas.Top="82.96" TextWrapping="Wrap"><Run Text="Observations "/><Run Text=":"/></TextBlock>
                    <TextBox Width="125.5" Height="22" Canvas.Left="159" Canvas.Top="25.96" Text="TextBox" TextWrapping="Wrap"/>
                    <TextBox Width="171.5" Height="23.04" Canvas.Left="113" Canvas.Top="51.96" Text="TextBox" TextWrapping="Wrap"/>
                    <TextBox Width="191.5" Height="119.04" Canvas.Left="93" Canvas.Top="82.96" Text="TextBox" TextWrapping="Wrap"/>
                </Canvas>
            </Border>
 
            <Image Source="C:\Users\Anthony kamax\Downloads\Icones\Logo KAMAX.gif" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Bottom" Canvas.Left="8" Canvas.Top="772.8" Width="91" Height="31"/>
            <ProgressBar Width="182" Height="13" Canvas.Left="113.76" Canvas.Top="782"/>
 
 
 
        </Canvas>
 
        <Grid Margin="315,35,0,36" Background="#FF404040">
            <Image Width="480" Height="640" Source="Resources/Capture02b.jpg" Stretch="Fill" Margin="568,86,0,94"/>
            <Image Width="480" Height="640" Source="Resources/Capture02NB.jpg" Stretch="Fill" Margin="19,86,0,94" OpacityMask="Black" HorizontalAlignment="Left" d:LayoutOverrides="Width"/>
 
 
 
 
 
 
            <ToolBar  Background="#FF404040" Margin="19,31,0,0" RenderTransformOrigin="0.5,0.5" Style="{DynamicResource ToolBarStyle1}" VerticalAlignment="Top" Height="42" HorizontalAlignment="Left" Width="242">
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
                    <Image Width="30" Height="30" Source="Resources/appbar.folder.open.png" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="C:\Users\Anthony kamax\Downloads\Icones\agt-imprimer-icone-9151-32.png" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="Resources/appbar.save.png" Height="30" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="Resources/appbar.page.copy.png" Height="30"  />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
                    <Image Source="Resources/appbar.magnify.add.png" Height="30"  />
 
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="Resources/appbar.magnify.minus.png" Height="30"  />
                </Button>
            </ToolBar>
            <ToolBar  Background="#FF626262" Margin="412,0,0,201.5" RenderTransformOrigin="0.5,0.5" Style="{DynamicResource ToolBarStyle1}" VerticalAlignment="Bottom" Height="42" HorizontalAlignment="Left" Width="247">
                <ToolBar.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform Angle="90"/>
                        <TranslateTransform/>
                    </TransformGroup>
                </ToolBar.RenderTransform>
 
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch" Margin="0,5.5,0,1.5">
 
                    <Image Source="Resources/appbar.ruler.png" Height="30" />
                </Button>
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch" Margin="0,3.5">
 
                    <Image Source="dessiner-modifier-crayon-ecrivez-icone-5630-32.png" />
                </Button>
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch">
 
                    <Image Source="Eraser_Icon_256.png"  />
                </Button>
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch">
 
                    <Image Source="Resources/appbar.base.select.png" Height="28" />
                </Button>
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch">
 
                    <Image Source="couleurs-roue-icone-9716-32.png" />
                </Button>
                <Button Height="30" HorizontalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" VerticalAlignment="Stretch">
                    <Button.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform />
                            <SkewTransform />
                            <RotateTransform Angle="-90" />
                            <TranslateTransform />
                        </TransformGroup>
                    </Button.RenderTransform>
                    <Image Source="rect5605.png" />
                </Button>
            </ToolBar>
            <ToolBar  Background="#FF626262" Margin="606,31,249,0" RenderTransformOrigin="0.5,0.5" Style="{DynamicResource ToolBarStyle1}" VerticalAlignment="Top" Height="42">
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
                    <Image Width="30" Height="30" Source="Resources\appbar.folder.open.png" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="agt-imprimer-icone-9151-321.png" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="Resources\appbar.save.png" Height="30" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="Resources\appbar.page.copy.png" Height="30"  />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="loupe-zoom-arriere-icone-9037-322.png" />
                </Button>
                <Button HorizontalAlignment="Stretch" VerticalAlignment="Stretch" RenderTransformOrigin="0.5,0.5" Height="30" Margin="0,3.5" >
 
                    <Image Source="loupe-zoom-avant-icone-8627-322.png" />
                </Button>
            </ToolBar>
            <Border CornerRadius="10"
					BorderBrush="Gray"
					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>

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

Merci d'avance pour votre aide

**tomlev** · 28/01/2014, 18h27

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 XAML :

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Loaded="Window_Loaded"

**tomlev** · 28/01/2014, 18h32

Envoyé par SkaknYoshi

je ne vois pas d'où cela peut venir

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

**SkaknYoshi** · 29/01/2014, 09h28

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

System.NullReferenceException pour affichage caméra

Windows Presentation Foundation

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