在 WebView2 應用程式中使用本機內容

• CoreWebView2.Navigate 方法

• CoreWebView2.Navigate 方法

• ICoreWebView2：：Navigate 方法

webView.CoreWebView2.Navigate(
          "file:///C:/Users/username/Documents/GitHub/Demos/demo-to-do/index.html");

webView.CoreWebView2.Navigate(
          "file:///C:/Users/username/Documents/GitHub/Demos/demo-to-do/index.html");

webView->Navigate(
         L"file:///C:/Users/username/Documents/GitHub/Demos/demo-to-do/index.html");

• CoreWebView2.NavigateToString 方法

• CoreWebView2.NavigateToString 方法

• ICoreWebView2：：NavigateToString 方法

// Define htmlString with the string representation of HTML as above.
webView.CoreWebView2.NavigateToString(htmlString);

// Define htmlString with the string representation of HTML as above.
webView.CoreWebView2.NavigateToString(htmlString);

// Define htmlString with the string representation of HTML as above.
webView->NavigateToString(htmlString);

• CoreWebView2.SetVirtualHostNameToFolderMapping 方法
• CoreWebView2.ClearVirtualHostNameToFolderMapping 方法
• CoreWebView2HostResourceAccessKind 列舉

• CoreWebView2.SetVirtualHostNameToFolderMapping 方法
• CoreWebView2.ClearVirtualHostNameToFolderMapping 方法
• CoreWebView2HostResourceAccessKind 列舉

• ICoreWebView2_3：：SetVirtualHostNameToFolderMapping 方法
• ICoreWebView2_3：：ClearVirtualHostNameToFolderMapping 方法
• COREWEBVIEW2_HOST_RESOURCE_ACCESS_KIND enum

webView.CoreWebView2.SetVirtualHostNameToFolderMapping("demo",
         "C:\Github\Demos\demo-to-do", CoreWebView2HostResourceAccessKind.DenyCors);
webView.CoreWebView2.Navigate("https://demo/index.html");

Windows.Storage.StorageFolder storageFolder =
                              Windows.Storage.ApplicationData.Current.LocalFolder;
Windows.Storage.StorageFolder demo = await storageFolder.GetFolderAsync("Demo");
webView.CoreWebView2.SetVirtualHostNameToFolderMapping("demo", demo.Path,
                                     CoreWebView2HostResourceAccessKind.DenyCors);
webView.CoreWebView2.Navigate("https://demo/index.html");

webView->SetVirtualHostNameToFolderMapping(L"demo", L"C:\\Github\\Demos\\demo-to-do",
                                  COREWEBVIEW2_HOST_RESOURCE_ACCESS_KIND_DENY_CORS);
webView->Navigate(L"https://demo/index.html");

• CoreWebView2.NavigateWithWebResourceRequest 方法
• CoreWebView2.WebResourceRequested 事件
• CoreWebView2WebResourceRequestedEventArgs.Response 屬性

• CoreWebView2.NavigateWithWebResourceRequest 方法
• CoreWebView2.WebResourceRequested 事件
• CoreWebView2WebResourceRequestedEventArgs.Response 屬性

• ICoreWebView2_2：：NavigateWithWebResourceRequest 方法
• ICoreWebView2：：WebResourceRequested 事件 (新增、 移除)
• ICoreWebView2WebResourceRequestedEventArgs：：get_Response

// Reading of response content stream happens asynchronously, and WebView2 does not
// directly dispose the stream once it read.  Therefore, use the following stream
// class, which properly disposes when WebView2 has read all data.  For details, see
// [CoreWebView2 does not close stream content](https://github.com/MicrosoftEdge/WebView2Feedback/issues/2513).
class ManagedStream : Stream {
    public ManagedStream(Stream s)
    {
        s_ = s;
    }

    public override bool CanRead => s_.CanRead;

    public override bool CanSeek => s_.CanSeek;

    public override bool CanWrite => s_.CanWrite;

    public override long Length => s_.Length;

    public override long Position { get => s_.Position; set => s_.Position = value; }

    public override void Flush()
    {
        throw new NotImplementedException();
    }

    public override long Seek(long offset, SeekOrigin origin)
    {
        return s_.Seek(offset, origin);
    }

    public override void SetLength(long value)
    {
        throw new NotImplementedException();
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
        int read = 0;
        try
        {
            read = s_.Read(buffer, offset, count);
            if (read == 0)
            {
                s_.Dispose();
            }
        }
        catch
        {
            s_.Dispose();
            throw;
        }
        return read;
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        throw new NotImplementedException();
    }

   private Stream s_;
}
webView.CoreWebView2.AddWebResourceRequestedFilter("https://demo/*",
                                                CoreWebView2WebResourceContext.All);
webView.CoreWebView2.WebResourceRequested += delegate (object sender,
                                     CoreWebView2WebResourceRequestedEventArgs args)
{
    string assetsFilePath = "C:\\Demo\\" +
                            args.Request.Uri.Substring("https://demo/*".Length - 1);
    try
    {
        FileStream fs = File.OpenRead(assetsFilePath);
        ManagedStream ms = new ManagedStream(fs);
        string headers = "";
        if (assetsFilePath.EndsWith(".html"))
        {
            headers = "Content-Type: text/html";
        }
        else if (assetsFilePath.EndsWith(".jpg"))
        {
            headers = "Content-Type: image/jpeg";
        } else if (assetsFilePath.EndsWith(".png"))
        {
            headers = "Content-Type: image/png";
        }
        else if (assetsFilePath.EndsWith(".css"))
        {
            headers = "Content-Type: text/css";
        }
        else if (assetsFilePath.EndsWith(".js"))
        {
            headers = "Content-Type: application/javascript";
        }

        args.Response = webView.CoreWebView2.Environment.CreateWebResourceResponse(
                                                            ms, 200, "OK", headers);
    }
    catch (Exception)
    {
        args.Response = webView.CoreWebView2.Environment.CreateWebResourceResponse(
                                                        null, 404, "Not found", "");
    }
};

class ManagedStream : IRandomAccessStream
{
    public ManagedStream(IRandomAccessStream s)
    {
        s_ = s;
    }

    public override bool CanRead => s_.CanRead;

    public override bool CanSeek => s_.CanSeek;

    public override bool CanWrite => s_.CanWrite;

    ulong IRandomAccessStream.Position =>
                                 { get => s_.Position; set => s_.Position = value; }

    public ulong Size => s_.Size;

    public IInputStream GetInputStreamAt(ulong position)
    {
        throw new NotImplementedException();
    }

    public IOutputStream GetOutputStreamAt(ulong position)
    {
        throw new NotImplementedException();
    }

    public void Seek(ulong position)
    {
        return s_.Seek(position);
    }

    public IRandomAccessStream CloneStream()
    {
        throw new NotImplementedException();
    }

    public IAsyncOperationWithProgress<IBuffer, uint> ReadAsync(IBuffer buffer,
                                             uint count, InputStreamOptions options)
    {
        IAsyncOperationWithProgress<IBuffer, uint> result;
        try
        {
            result = s_.ReadAsync(buffer, count, options);
            // Once read is complete if no data was read, dispose the underlying
            // stream.
            result.Completed += new AsyncOperationWithProgressCompletedHandler<IBuffer, uint>(
                     delegate (IAsyncOperationWithProgress<IBuffer, uint> asyncInfo,
                               AsyncStatus asyncStatus)
            {
                if (asyncInfo.GetResults().Length == 0)
                {
                    s_.Dispose();
                }
            });
        }
        catch
        {
            s_.Dispose();
            throw;
        }
        return result;
    }

    public IAsyncOperationWithProgress<uint, uint> WriteAsync(IBuffer buffer)
    {
        throw new NotImplementedException();
    }

    public IAsyncOperation<bool> FlushAsync()
    {
        throw new NotImplementedException();
    }

    public void Dispose()
    {
        throw new NotImplementedException();
    }

    private IRandomAccessStream s_;
}

WebView2.CoreWebView2.AddWebResourceRequestedFilter("https://demo/*",
                                                CoreWebView2WebResourceContext.All);
WebView2.CoreWebView2.WebResourceRequested += async delegate (CoreWebView2 sender,
                                     CoreWebView2WebResourceRequestedEventArgs args)
{
    string filename = args.Request.Uri.Substring("https://demo/*".Length - 1);
    try
    {
        Windows.Storage.StorageFolder storageFolder =
                                Windows.Storage.ApplicationData.Current.LocalFolder;
        Windows.Storage.StorageFolder demo = await storageFolder.GetFolderAsync("Demo");
        Windows.Storage.StorageFile asset = await demo.GetFileAsync(filename);
       
        ManagedStream ms = new ManagedStream(await asset.OpenReadAsync());
        string headers = "";
        if (filename.EndsWith(".html"))
        {
            headers = "Content-Type: text/html";
        }
        else if (filename.EndsWith(".jpg"))
        {
            headers = "Content-Type: image/jpeg";
        }
        else if (filename.EndsWith(".png"))
        {
            headers = "Content-Type: image/png";
        }
        else if (filename.EndsWith(".css"))
        {
            headers = "Content-Type: text/css";
        }
        else if (filename.EndsWith(".js"))
        {
            headers = "Content-Type: application/javascript";
        }

        args.Response = WebView2.CoreWebView2.Environment.CreateWebResourceResponse(ms,
                                                                200, "OK", headers);
    }
    catch (Exception)
    {
        args.Response = WebView2.CoreWebView2.Environment.CreateWebResourceResponse(null,
                                                              404, "Not found", "");
    }
};

CHECK_FAILURE(m_webView->AddWebResourceRequestedFilter(
                L"https://demo/*", COREWEBVIEW2_WEB_RESOURCE_CONTEXT_ALL));
CHECK_FAILURE(m_webView->add_WebResourceRequested(
               Callback<ICoreWebView2WebResourceRequestedEventHandler>(
                    this, &AppWindow::WebResourceRequestedEventHandler)
                    .Get(),
                &m_webResourceRequestedToken));

HRESULT AppWindow::WebResourceRequestedEventHandler(
    ICoreWebView2* webview, ICoreWebView2WebResourceRequestedEventArgs* args)
{
    wil::com_ptr<ICoreWebView2WebResourceRequest> request;
    wil::com_ptr<ICoreWebView2WebResourceResponse> response;
    wil::com_ptr<IStream> stream;
   
    CHECK_FAILURE(args->get_Request(&request));
    wil::unique_cotaskmem_string uri;
    CHECK_FAILURE(request->get_Uri(&uri));
    std::wstring assetsFilePath = L"C:\\Demo";
    assetsFilePath += (uri.get() + ARRAYSIZE(L"https://demo"));
    SHCreateStreamOnFileEx(
        assetsFilePath.c_str(), STGM_READ, FILE_ATTRIBUTE_NORMAL, FALSE,
        nullptr, &stream);
    if (stream)
    {
        std::wstring headers;
        if (assetsFilePath.substr(assetsFilePath.find_last_of(L".") + 1) ==
            L"html")
        {
            headers = L"Content-Type: text/html";
        }
        else if (
            assetsFilePath.substr(assetsFilePath.find_last_of(L".") + 1) ==
            L"jpg")
        {
            headers = L"Content-Type: image/jpeg";
        }
        else if (
            assetsFilePath.substr(assetsFilePath.find_last_of(L".") + 1) ==
            L"png")
        {
            headers = L"Content-Type: image/png";
        }
        else if (
            assetsFilePath.substr(assetsFilePath.find_last_of(L".") + 1) ==
            L"css")
        {
            headers = L"Content-Type: text/css";
        }
        else if (
            assetsFilePath.substr(assetsFilePath.find_last_of(L".") + 1) ==
            L"js")
        {
            headers = L"Content-Type: application/javascript";
        }

        CHECK_FAILURE(
            webViewEnvironment->CreateWebResourceResponse(
                stream.get(), 200, L"OK", headers.c_str(), &response));
        CHECK_FAILURE(args->put_Response(response.get()));
    }
    else
    {
        CHECK_FAILURE(
            webViewEnvironment->CreateWebResourceResponse(
                nullptr, 404, L"Not Found", L"", &response));
        CHECK_FAILURE(args->put_Response(response.get()));
    }
}