WebView.CapturePreviewToStreamAsync(IRandomAccessStream) Method

Reference

Definition

Namespace:: Windows.UI.Xaml.Controls

Important

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Creates an image of the current WebView contents and writes it to the specified stream.

public:
 virtual IAsyncAction ^ CapturePreviewToStreamAsync(IRandomAccessStream ^ stream) = CapturePreviewToStreamAsync;

/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncAction CapturePreviewToStreamAsync(IRandomAccessStream const& stream);

[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncAction CapturePreviewToStreamAsync(IRandomAccessStream stream);

function capturePreviewToStreamAsync(stream)

Public Function CapturePreviewToStreamAsync (stream As IRandomAccessStream) As IAsyncAction

Parameters

stream: IRandomAccessStream

The stream to write the image to.

Returns

IAsyncAction

An asynchronous action to await the capture operation.

Attributes: RemoteAsyncAttribute

Examples

This example shows how to use this method to create a thumbnail image of the current content. For the complete example, see the WebView control sample.

private async void bookmarkBtn_Click(object sender, RoutedEventArgs e)
{
    InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream();
    await webView8.CapturePreviewToStreamAsync(ms);

    // Create a small thumbnail.
    int longlength = 180, width = 0, height = 0;
    double srcwidth = webView8.ActualWidth, srcheight = webView8.ActualHeight;
    double factor = srcwidth / srcheight;
    if (factor < 1)
    {
        height = longlength;
        width = (int)(longlength * factor);
    }
    else
    {
        width = longlength;
        height = (int)(longlength / factor);
    }
    BitmapSource small = await resize(width, height, ms);

    BookmarkItem item = new BookmarkItem();
    item.Title = webView8.DocumentTitle;
    item.PageUrl = webView8.Source;
    item.Preview = small;

    bookmarks.Add(item);
}

Applies to