WindowsRuntimeStreamExtensions.AsOutputStream(Stream) Méthode
Important
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Important
Cette API n’est pas conforme CLS.
Convertit un flux managé dans .NET pour les applications du Windows Store en un flux de sortie Windows Runtime.
public:
[System::Runtime::CompilerServices::Extension]
static Windows::Storage::Streams::IOutputStream ^ AsOutputStream(System::IO::Stream ^ stream);
[System.CLSCompliant(false)]
public static Windows.Storage.Streams.IOutputStream AsOutputStream (this System.IO.Stream stream);
[<System.CLSCompliant(false)>]
static member AsOutputStream : System.IO.Stream -> Windows.Storage.Streams.IOutputStream
<Extension()>
Public Function AsOutputStream (stream As Stream) As IOutputStream
- stream
- Stream
Flux à convertir.
Objet IOutputStream Windows Runtime qui représente le flux converti.
- Attributs
stream
a la valeur null
.
Le flux ne prend pas en charge la lecture.
L’exemple suivant montre comment utiliser les AsInputStream méthodes et AsOutputStream
> pour convertir un flux managé vers et à partir d’un flux dans le Windows Runtime.
using System;
using System.IO;
using System.Text;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
namespace ExampleApplication
{
public sealed partial class BlankPage : Page
{
System.Text.UnicodeEncoding ue;
byte[] bytesToWrite;
byte[] bytesToAdd;
int totalBytes;
public BlankPage()
{
this.InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
ue = new System.Text.UnicodeEncoding();
bytesToWrite = ue.GetBytes("example text to write to memory stream");
bytesToAdd = ue.GetBytes("text added through datawriter");
totalBytes = bytesToWrite.Length + bytesToAdd.Length;
}
private async void CreateButton_Click(object sender, RoutedEventArgs e)
{
byte[] bytesRead = new byte[totalBytes];
using (MemoryStream memStream = new MemoryStream(totalBytes))
{
await memStream.WriteAsync(bytesToWrite, 0, bytesToWrite.Length);
DataWriter writer = new DataWriter(memStream.AsOutputStream());
writer.WriteBytes(bytesToAdd);
await writer.StoreAsync();
memStream.Seek(0, SeekOrigin.Begin);
DataReader reader = new DataReader(memStream.AsInputStream());
await reader.LoadAsync((uint)totalBytes);
reader.ReadBytes(bytesRead);
Results.Text = ue.GetString(bytesRead, 0, bytesRead.Length);
}
}
}
}
Imports Windows.Storage.Streams
Public NotInheritable Class BlankPage
Inherits Page
Dim ue As System.Text.UnicodeEncoding
Dim bytesToWrite() As Byte
Dim bytesToAdd() As Byte
Dim totalBytes As Integer
Protected Overrides Sub OnNavigatedTo(e As Navigation.NavigationEventArgs)
ue = New System.Text.UnicodeEncoding()
bytesToWrite = ue.GetBytes("example text to write to memory stream")
bytesToAdd = ue.GetBytes("text added through datawriter")
totalBytes = bytesToWrite.Length + bytesToAdd.Length
End Sub
Private Async Sub CreateButton_Click(sender As Object, e As RoutedEventArgs)
Dim bytesRead(totalBytes - 1) As Byte
Using memStream As MemoryStream = New MemoryStream(totalBytes)
Await memStream.WriteAsync(bytesToWrite, 0, bytesToWrite.Length)
Dim writer As DataWriter = New DataWriter(memStream.AsOutputStream())
writer.WriteBytes(bytesToAdd)
Await writer.StoreAsync()
memStream.Seek(0, SeekOrigin.Begin)
Dim reader As DataReader = New DataReader(memStream.AsInputStream())
Await reader.LoadAsync(CType(totalBytes, UInteger))
reader.ReadBytes(bytesRead)
Results.Text = ue.GetString(bytesRead, 0, bytesRead.Length)
End Using
End Sub
End Class
Voici le code XAML associé à l’exemple précédent.
<Page
x:Class="ExampleApplication.BlankPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:ExampleApplication"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<StackPanel Background="{StaticResource ApplicationPageBackgroundBrush}" VerticalAlignment="Center" HorizontalAlignment="Center">
<Button Name="CreateButton" Content="Write and read with stream" Click="CreateButton_Click"></Button>
<TextBlock Name="Results"></TextBlock>
</StackPanel>
</Page>
Notes
En Visual Basic et C#, vous pouvez appeler cette méthode en tant que méthode instance sur n’importe quel objet de type Stream. Lorsque vous utilisez la syntaxe des méthodes d'instance pour appeler cette méthode, omettez le premier paramètre. Pour plus d’informations, consultez Méthodes d’extension (Visual Basic) ou Méthodes d’extension (Guide de programmation C#).
Produit | Versions |
---|---|
UWP | 10.0 |
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