interface ICoreWebView2_15

Article
10/21/2024

interface ICoreWebView2_15
  : public ICoreWebView2_14

This interface is an extension of ICoreWebView2_14 that supports status Favicons.

Summary

Members	Descriptions
add_FaviconChanged	Add an event handler for the `FaviconChanged` event.
get_FaviconUri	Get the current Uri of the favicon as a string.
GetFavicon	Async function for getting the actual image data of the favicon.
remove_FaviconChanged	Remove the event handler for `FaviconChanged` event.

Applies to

Product	Introduced
WebView2 Win32	1.0.1293.44
WebView2 Win32 Prerelease	1.0.1305

Members

add_FaviconChanged

Add an event handler for the FaviconChanged event.

public HRESULT add_FaviconChanged(ICoreWebView2FaviconChangedEventHandler * eventHandler, EventRegistrationToken * token)

The FaviconChanged event is raised when the favicon had a different URL then the previous URL. The FaviconChanged event will be raised for first navigating to a new document, whether or not a document declares a Favicon in HTML if the favicon is different from the previous fav icon. The event will be raised again if a favicon is declared in its HTML or has script to set its favicon. The favicon information can then be retrieved with GetFavicon and FaviconUri.

get_FaviconUri

Get the current Uri of the favicon as a string.

public HRESULT get_FaviconUri(LPWSTR * value)

If the value is null, then the return value is E_POINTER, otherwise it is S_OK. If a page has no favicon then the value is an empty string.

GetFavicon

Async function for getting the actual image data of the favicon.

public HRESULT GetFavicon(COREWEBVIEW2_FAVICON_IMAGE_FORMAT format, ICoreWebView2GetFaviconCompletedHandler * completedHandler)

The image is copied to the imageStream object in ICoreWebView2GetFaviconCompletedHandler. If there is no image then no data would be copied into the imageStream. The format is the file format to return the image stream. completedHandler is executed at the end of the operation.

    // Register a handler for the FaviconUriChanged event.
    // This will provided the current favicon of the page, as well
    // as any changes that occur during the page lifetime
    if (m_webView2_15)
    {
        Gdiplus::GdiplusStartupInput gdiplusStartupInput;

        // Initialize GDI+.
        Gdiplus::GdiplusStartup(&gdiplusToken_, &gdiplusStartupInput, NULL);
        CHECK_FAILURE(m_webView2_15->add_FaviconChanged(
            Callback<ICoreWebView2FaviconChangedEventHandler>(
                [this](ICoreWebView2* sender, IUnknown* args) -> HRESULT
                {
                    if (m_faviconChanged)
                    {
                        wil::unique_cotaskmem_string url;
                        Microsoft::WRL::ComPtr<ICoreWebView2_15> webview2;
                        CHECK_FAILURE(sender->QueryInterface(IID_PPV_ARGS(&webview2)));

                        CHECK_FAILURE(webview2->get_FaviconUri(&url));
                        std::wstring strUrl(url.get());

                        webview2->GetFavicon(
                            COREWEBVIEW2_FAVICON_IMAGE_FORMAT_PNG,
                            Callback<ICoreWebView2GetFaviconCompletedHandler>(
                                [this,
                                 strUrl](HRESULT errorCode, IStream* iconStream) -> HRESULT
                                {
                                    CHECK_FAILURE(errorCode);
                                    Gdiplus::Bitmap iconBitmap(iconStream);
                                    wil::unique_hicon icon;
                                    if (iconBitmap.GetHICON(&icon) == Gdiplus::Status::Ok)
                                    {
                                        m_favicon = std::move(icon);
                                        SendMessage(
                                            m_appWindow->GetMainWindow(), WM_SETICON,
                                            ICON_SMALL, (LPARAM)m_favicon.get());
                                        m_statusBar.Show(strUrl);
                                    }
                                    else
                                    {
                                        SendMessage(
                                            m_appWindow->GetMainWindow(), WM_SETICON,
                                            ICON_SMALL, (LPARAM)IDC_NO);
                                        m_statusBar.Show(L"No Icon");
                                    }

                                    return S_OK;
                                })
                                .Get());
                    }
                    return S_OK;
                })
                .Get(),
            &m_faviconChangedToken));
    }

remove_FaviconChanged

Remove the event handler for FaviconChanged event.

public HRESULT remove_FaviconChanged(EventRegistrationToken token)

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