Chromium Embedded Framework Forum

by **abizeau** » Thu Mar 08, 2018 2:53 pm

Hello,

I have an issue with OnContextReleased from CefRenderProcessHandler. I would like to call this method every time I close the browser.

Based on what I read around the forum: http://magpcss.org/ceforum/viewtopic.php?f=6&t=14687. The OnContextReleased is only called on thing like "reload". So I tried it, close the windows with "X" or any other, its never calling the OnContextReleased, but when I force the refresh (eg: from the debbuger), the OnContextReleased is called and the browser continue to run afterward with a new context (I supposed at least).

Is there a way to ensure the OnContextReleased to be called every time the UI is about to close ? Its because my Renderer process implement some CefV8Accessor and I would like to save all V8 values on disk. I already read all values from the disk during the V8 Accessor construtor, this works perfectly, but the "saving" part is never called when I need it.

Thanks,
Alex

by **magreenblatt** » Thu Mar 08, 2018 2:58 pm

You should trigger saving from the JS onunload event instead.

by **abizeau** » Thu Mar 08, 2018 3:07 pm

How to ?

I already have the saving coded in my C++. and C++ V8 Accessor code is not accessible with an "execute" from the CefV8Handler.

I dont understand how I could tell to C++ to save on disk the information when JS unload.

by **magreenblatt** » Thu Mar 08, 2018 3:11 pm

I'm not sure what you mean by "C++ V8 Accessor code is not accessible with an "execute" from the CefV8Handler." See https://bitbucket.org/chromiumembedded/ ... gration.md

by **abizeau** » Thu Mar 08, 2018 3:22 pm

You should trigger saving from the JS onunload event instead.

As far as I understand, the "onbeforeunload" is called from CefLifeSpanHandler, so this is inside the browser process.

If I want to call my function SaveOnDisk in my

Code: Select all: class KEY36V8Accessor : public CefV8Accessor { private: void LoadFromDisk(); void SaveOnDisk(); std::string m_param1; int m_param2; public: KEY36V8Accessor(); virtual bool Get(const CefString& name, const CefRefPtr<CefV8Value> object, CefRefPtr<CefV8Value>& retval, CefString& exception) OVERRIDE; virtual bool Set(const CefString& name, const CefRefPtr<CefV8Value> object, const CefRefPtr<CefV8Value> value, CefString& exception) OVERRIDE; ... };

I need to use an IPC to the renderer ? There is no easier way to do this ?

by **abizeau** » Thu Mar 08, 2018 3:37 pm

I did the following :

Inside the AppHandler.cpp

Code: Select all: bool AppHandler::DoClose(CefRefPtr<CefBrowser> browser) { CEF_REQUIRE_UI_THREAD(); // Closing the main window requires special handling. See the DoClose() // documentation in the CEF header for a detailed destription of this // process. if ( browser_list_.size() == 1 ) { // Set a flag to indicate that the window close should be allowed. is_closing_ = true; // Create the message object. CefRefPtr<CefProcessMessage> msg = CefProcessMessage::Create("SavePreferencesOnDisk"); // Send the process message to the render process. browser->SendProcessMessage(PID_RENDERER, msg); } // Allow the close. For windowed browsers this will result in the OS close // event being sent. return false; }

And in MyApp.cpp

Code: Select all: bool MyApp::OnProcessMessageReceived(CefRefPtr<CefBrowser> browser, CefProcessId source_process, CefRefPtr<CefProcessMessage> message) { CEF_REQUIRE_RENDERER_THREAD(); // Check the message name. const std::string& message_name = message->GetName(); if ( message_name == "SavePreferencesOnDisk" ) { m_V8Accessor->SavePreferences(); return true; } return false; }

Its working for now. But is there a risk to the browser to "terminate" (from the OnBeforeClose) the renderer process before the SavePreferences is finished to execute ?

by **magreenblatt** » Thu Mar 08, 2018 4:24 pm

I mean this:

Code: Select all: <body onunload="window.myBoundFunc();">

And then implement window.myBoundFunc using V8 bindings.

by **abizeau** » Thu Mar 08, 2018 6:00 pm

Its not working. I reach the Execute() function from the CefV8Handler. But nothing is executed in it.

I reach a breakpoints and everything seems to die too fast before reaching the end of the execute.

But if I call the function with a button (without "X"), its working fine.

Chromium Embedded Framework Forum

How to force OnContextReleased everytime ?

How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

Re: How to force OnContextReleased everytime ?

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