winforms qr code reader

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} //a broadcast style notification to all connected clients about a //specific client's connection/disconnection activity [DataContract] public class ConnectionDisconnectionNotification { [DataMember] public string Participant { get; set; } [DataMember] public bool Connect { get; set; } } //a notification from a client to the server that it has ended a chat [DataContract] public class ChatEndNotification { [DataMember] public string From { get; set; } [DataMember] public string To { get; set; } } //a chat message [DataContract] public class TextMessage { [DataMember] public string From { get; set; } [DataMember] public string To { get; set; } [DataMember] public string Body { get; set; } } You use DataContractJsonSerializer to serialize and deserialize the message types shown in Listing 7-21 For more details about JSON serialization and DataContractJsonSerializer, refer to Recipe 7-3.

Because you have to deserialize from a byte[] to a CLR type on receiving a message, you face the challenge of not knowing the actual type information to pass on to DataContractJsonSerializer To resolve this problem, you introduce a wrapper type named MessageWrapper, as shown in Listing 7-19, with a Body property of type object that contains the instance of the specific message you want to send All messages are wrapped in this type before they are serialized to be sent out through the socket The KnownTypeAttributes applied to MessageWrapper ensures that the serializer uses the correct CLR type for the contained message while serializing the MessageWrapper instance to JSON, even though the Body property is of type object It also allows you to specify typeof(MessageWrapper) as the parameter to the DataContractJsonSerializer instance for deserialization, ensuring that the correct type is used to deserialize the contained message.

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You define two static methods, DeserializeMessage() and SerializeMessage(), on the MessageWrapper type that encapsulates this logic Before you move into the sockets code, let s quickly look at the XAML UI Listing 7-22 lists the XAML for MainPage..

It is easy to retrieve any component within another ID space by invoking the getFellow(spaceOwnerID, componentID) method, which is much the same as getting a file in a file folder. Listing 4-7 provides an example illustrating this idea. The window component is a typical space owner. In this example, there must be at least two ID spaces, since there are two window components in this page. Both of these ID spaces include a label component, and you could have the same identifier labelD for each of these two label components (since they are in different ID spaces). As a result, the problem of identifier conflict is resolved by using ID spaces to divide a ZUML page into a number of zones, like folders. A hierarchical relationship does exist between space owners. A space owner could be a fellow component of another ID space when a space owner is embedded within another ID space. In this example, the "winC" component is a fellow component of "winA" since it is embedded within the ID space of the winA component. Therefore, if you want to retrieve a component within the ID space of "winC" , for example, labelD , you should invoke the getFellow() method in the following format:

Listing 7-22. XAML for the chat client page in MainPage.xaml <UserControl x:Class="Recipe7_5.ChatClient.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="308" Height="550" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"> <UserControl.Resources> <ControlTemplate x:Key="ctTalkButton" TargetType="Button"> <Grid> <Image Source="SpeechMicHS.png"/> </Grid> </ControlTemplate> <DataTemplate x:Key="dtConversation"> <Grid Width="Auto" Height="Auto"> <Grid.RowDefinitions> <RowDefinition Height="0.191*"/> <RowDefinition Height="0.809*"/> </Grid.RowDefinitions> <TextBlock Text="{Binding From}" TextWrapping="Wrap" HorizontalAlignment="Left" VerticalAlignment="Top" Foreground="#FF1C2E7C"/> <TextBlock Text="{Binding Body}" TextWrapping="Wrap" HorizontalAlignment="Stretch" VerticalAlignment="Top" d:LayoutOverrides="VerticalAlignment" Grid.Row="1" Margin="8,8,8,8" FontSize="12" FontFamily="Georgia" FontWeight="Normal"/> </Grid> </DataTemplate> <ControlTemplate x:Key="ct_lbxConversationItem" TargetType="ListBoxItem"> <Grid Background="{TemplateBinding Background}"> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions>

<ContentPresenter HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="Stretch" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" TextAlignment="{TemplateBinding TextAlignment}" TextDecorations="{TemplateBinding TextDecorations}" TextWrapping="Wrap"/> </Grid> </ControlTemplate> <Style x:Key="style_lbxitemConversation" TargetType="ListBoxItem"> <Setter Property="IsEnabled" Value="true"/> <Setter Property="Foreground" Value="#FF000000"/> <Setter Property="HorizontalContentAlignment" Value="Left"/> <Setter Property="VerticalContentAlignment" Value="Top"/> <Setter Property="Cursor" Value="Arrow"/> <Setter Property="TextAlignment" Value="Left"/> <Setter Property="TextWrapping" Value="Wrap"/> <Setter Property="FontSize" Value="12"/> <Setter Property="Background" Value="White"/> <Setter Property="Padding" Value="2,0,0,0"/> <Setter Property="Template" Value="{StaticResource ct_lbxConversationItem}"/> </Style> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <Border Padding="4,4,4,4" BorderBrush="Black" Background="LightBlue" BorderThickness="4" Grid.RowSpan="3"/> <Grid Visibility="Visible" x:Name="viewLogin" Width="300" Height="550"> <Grid.RowDefinitions> <RowDefinition Height="0.364*"/> <RowDefinition Height="0.086*"/> <RowDefinition Height="0.1*"/> <RowDefinition Height="0.1*"/> <RowDefinition Height="0.35*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions>

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