Method CloseWebView

SampleApps/WebView2APISample/AppWindow.cpp:2610–2720

[Close] Close the WebView and deinitialize related state. This doesn't close the app window.

//! [Close]
// Close the WebView and deinitialize related state. This doesn't close the app window.
bool AppWindow::CloseWebView(bool cleanupUserDataFolder)
{
    if (auto file = GetComponent<FileComponent>())
    {
        if (file->IsPrintToPdfInProgress())
        {
            int selection = MessageBox(
                m_mainWindow, L"Print to PDF is in progress. Continue closing?",
                L"Print to PDF", MB_YESNO);
            if (selection == IDNO)
            {
                return false;
            }
        }
    }
    // 1. Delete components.
    DeleteAllComponents();

    // 2. If cleanup needed and BrowserProcessExited event interface available,
    // register to cleanup upon browser exit.
    wil::com_ptr<ICoreWebView2Environment5> environment5;
    if (m_webViewEnvironment)
    {
        environment5 = m_webViewEnvironment.try_query<ICoreWebView2Environment5>();
    }
    if (cleanupUserDataFolder && environment5)
    {
        // Before closing the WebView, register a handler with code to run once the
        // browser process and associated processes are terminated.
        CHECK_FAILURE(environment5->add_BrowserProcessExited(
            Callback<ICoreWebView2BrowserProcessExitedEventHandler>(
                [environment5, this](
                    ICoreWebView2Environment* sender,
                    ICoreWebView2BrowserProcessExitedEventArgs* args)
                {
                    COREWEBVIEW2_BROWSER_PROCESS_EXIT_KIND kind;
                    UINT32 pid;
                    CHECK_FAILURE(args->get_BrowserProcessExitKind(&kind));
                    CHECK_FAILURE(args->get_BrowserProcessId(&pid));

                    // If a new WebView is created from this CoreWebView2Environment after
                    // the browser has exited but before our handler gets to run, a new
                    // browser process will be created and lock the user data folder
                    // again. Do not attempt to cleanup the user data folder in these
                    // cases. We check the PID of the exited browser process against the
                    // PID of the browser process to which our last CoreWebView2 attached.
                    if (pid == m_newestBrowserPid)
                    {
                        // Watch for graceful browser process exit. Let ProcessFailed event
                        // handler take care of failed browser process termination.
                        if (kind == COREWEBVIEW2_BROWSER_PROCESS_EXIT_KIND_NORMAL)
                        {
                            CHECK_FAILURE(environment5->remove_BrowserProcessExited(
                                m_browserExitedEventToken));
                            // Release the environment only after the handler is invoked.
                            // Otherwise, there will be no environment to raise the event when
                            // the collection of WebView2 Runtime processes exit.
                            m_webViewEnvironment = nullptr;