Get IHTMLDocument and OleObject

[Lion85]

Hello everyone,
is there by any chance a method to get from the browser IHTMLDocument and OleObject?

[salvadordf]

Hi,

IHTMLDocument is only available in TWebBrowser when it's configured to use Internet Explorer.

WebView2 doesn't have IHTMLDocument and you can only access the DOM using JavaScript at this moment.

[Lion85]

Thank you for your reply!
In my old browser I had a code like this:

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IDispatch* pHtmlDoc = m_browser.get_Document();

CComPtr<IHTMLDocument2> pHtmlDocument2;
pHtmlDoc->QueryInterface(IID_IHTMLDocument2, (void**)&pHtmlDocument2));

CComPtr<IViewObject2> pViewObject;
pHtmlDocument2->QueryInterface(IID_IViewObject2, (void **)&pViewObject));

I can't find an alternative ...

[salvadordf]

Chromium based browsers have a much different API than Internet Explorer.

Read this for more details :
https://learn.microsoft.com/en-us/microsoft-edge/webview2/
https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/?view=webview2-1.0.1518.46

What do you want to do with pViewObject, pHtmlDocument2 and pHtmlDoc ?

[Lion85]

I need to draw content above the browser window

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OleDraw(pViewObject.m_Obj, DVASPECT_CONTENT, DC, &cr);

DC is HDC and cr is RECT.

[salvadordf]

The WebView2 API doesn't expose any interface to draw over the browser but you can try a browser in "Windowless mode" and create a "Visual" over the browser.

The Windowless mode uses the DirectComposition API :
https://docs.microsoft.com/en-us/windows/win32/directcomp/directcomposition-portal

Check the WindowlessBrowser demo to see it working. I still have to fix some scaling issues in that demo when it runs in high DPI monitors.

[Lion85]

I am still struggling with this problem.
I have tried this code. But I still can't solve it.. Would you have any advice?

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     "ICoreWebView2 * aWebView" //TO SHOW WHAT TYPE IT IS 
      IUnknown* oleObject = NULL;
      hr = aWebView->QueryInterface(IID_PPV_ARGS(&oleObject));
      if (SUCCEEDED(hr)) {
        RECT clientRect = { 0 };
        ::GetClientRect(HWND, &clientRect);
        HDC hdc = ::GetDC(HWND);
        OleDraw(oleObject, DVASPECT_CONTENT, hdc, &clientRect);
        ::ReleaseDC(HWND, hdc);

I've tried looking at 'WindowlessBrowser' but that's not what I'm looking for....

[salvadordf]

WebView2 doesn't support a pure "off-screen rendering mode" like CEF.
As far as I know, the only way to draw over a WebView2 browser is using the "Windowless mode".

[Lion85]

Perfect thank you very much