interface ICoreWebView2Frame

Article
10/21/2024

interface ICoreWebView2Frame
  : public IUnknown

ICoreWebView2Frame provides direct access to the iframes information.

Summary

Members	Descriptions
add_Destroyed	The Destroyed event is raised when the iframe corresponding to this CoreWebView2Frame object is removed or the document containing that iframe is destroyed.
add_NameChanged	Raised when the iframe changes its window.name property.
AddHostObjectToScriptWithOrigins	Add the provided host object to script running in the iframe with the specified name for the list of the specified origins.
get_Name	The value of iframe's window.name property.
IsDestroyed	Check whether a frame is destroyed.
remove_Destroyed	Remove an event handler previously added with add_Destroyed.
remove_NameChanged	Remove an event handler previously added with add_NameChanged.
RemoveHostObjectFromScript	Remove the host object specified by the name so that it is no longer accessible from JavaScript code in the iframe.

You can get an ICoreWebView2Frame by handling the ICoreWebView2_4::add_FrameCreated event.

Applies to

Product	Introduced
WebView2 Win32	1.0.902.49
WebView2 Win32 Prerelease	1.0.902

Members

add_Destroyed

The Destroyed event is raised when the iframe corresponding to this CoreWebView2Frame object is removed or the document containing that iframe is destroyed.

public HRESULT add_Destroyed(ICoreWebView2FrameDestroyedEventHandler * eventHandler, EventRegistrationToken * token)

add_NameChanged

Raised when the iframe changes its window.name property.

public HRESULT add_NameChanged(ICoreWebView2FrameNameChangedEventHandler * eventHandler, EventRegistrationToken * token)

AddHostObjectToScriptWithOrigins

Add the provided host object to script running in the iframe with the specified name for the list of the specified origins.

public HRESULT AddHostObjectToScriptWithOrigins(LPCWSTR name, VARIANT * object, UINT32 originsCount, LPCWSTR * origins)

The host object will be accessible for this iframe only if the iframe's origin during access matches one of the origins which are passed. The provided origins will be normalized before comparing to the origin of the document. So the scheme name is made lower case, the host will be punycode decoded as appropriate, default port values will be removed, and so on. This means the origin's host may be punycode encoded or not and will match regardless. If list contains malformed origin the call will fail. The method can be called multiple times in a row without calling RemoveHostObjectFromScript for the same object name. It will replace the previous object with the new object and new list of origins. List of origins will be treated as following:

empty list - call will succeed and object will be added for the iframe but it will not be exposed to any origin;
list with origins - during access to host object from iframe the origin will be checked that it belongs to this list;
list with "*" element - host object will be available for iframe for all origins. We suggest not to use this feature without understanding security implications of giving access to host object from from iframes with unknown origins.
list with "file://" element - host object will be available for iframes loaded via file protocol. Calling this method fails if it is called after the iframe is destroyed.

                wil::unique_variant remoteObjectAsVariant;
                // It will throw if m_hostObject fails the QI, but because it is our object
                // it should always succeed.
                m_hostObject.query_to<IDispatch>(&remoteObjectAsVariant.pdispVal);
                remoteObjectAsVariant.vt = VT_DISPATCH;

                // Create list of origins which will be checked.
                // iframe will have access to host object only if its origin belongs
                // to this list.
                LPCWSTR origin = L"https://appassets.example/";

                CHECK_FAILURE(webviewFrame->AddHostObjectToScriptWithOrigins(
                    L"sample", &remoteObjectAsVariant, 1, &origin));

For more information about host objects navigate to ICoreWebView2::AddHostObjectToScript.

get_Name

The value of iframe's window.name property.

public HRESULT get_Name(LPWSTR * name)

The default value equals to iframe html tag declaring it. You can access this property even if the iframe is destroyed.

The caller must free the returned string with CoTaskMemFree. See API Conventions.

IsDestroyed

Check whether a frame is destroyed.

public HRESULT IsDestroyed(BOOL * destroyed)

Returns true during the Destroyed event.

remove_Destroyed

Remove an event handler previously added with add_Destroyed.

public HRESULT remove_Destroyed(EventRegistrationToken token)

remove_NameChanged

Remove an event handler previously added with add_NameChanged.

public HRESULT remove_NameChanged(EventRegistrationToken token)

RemoveHostObjectFromScript

Remove the host object specified by the name so that it is no longer accessible from JavaScript code in the iframe.

public HRESULT RemoveHostObjectFromScript(LPCWSTR name)

While new access attempts are denied, if the object is already obtained by JavaScript code in the iframe, the JavaScript code continues to have access to that object. Calling this method for a name that is already removed or was never added fails. If the iframe is destroyed this method will return fail also.

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