How does CefBrowser known its renderer process created?

[Czarek]

Just make sure that you call CefV8Context::IsValid before doing any operations. Do not keep any references to context after OnContextReleased is called.

[Streamlet]

Just make sure that you call CefV8Context::IsValid before doing any operations. Do not keep any references to context after OnContextReleased is called.

OK, I see.
Well, let's come back to the orginal question.

You can use CefRenderProcessHandler::OnBrowserCreated and send IPC message to the Browser precess. In CefClient::OnProcessMessageReceived there is CefBrowser parameter.

Excuese me please,

in OnBrowserCreated, browser->GetMainFrame() returns nullptr，so I cannot do browser->GetMainFrame()->SendProcessMessage

My purpose is send infomation about JS injection to render process before its OnContextCreated, and in OnContextCreated I will put JS variables into context.

Curently my walkaround is, send IPC message when OnRenderViewReady, the IPC message usually arrived before OnContextCreated.
But when a browser navigates to a new URL and triggers creation of new site instance, the IPC message arrived after OnContextCreated.

So I need to judge if IPC message have arrived in OnContextCreated.
If it does, then I can set JS env to context;
if not, I do this inside OnProcessMessageReceived, so I need to save context in OnContextCreated and use it in OnProcessMessageReceived, calling context->GetTaskRunner()->PostTask, context->Enter(), do with context, context->Exit()

The solution looks too complex...

Is there a simple way to send message to render process before OnContextCreated?

Could you give me some suggestion?

[magreenblatt]

You can pass extra_info parameters to CreateBrowser which are then delivered to CefRenderProcessHandler::OnBrowserCreated. That call should occur before OnContextCreated.

[Streamlet]

You can pass extra_info parameters to CreateBrowser which are then delivered to CefRenderProcessHandler::OnBrowserCreated. That call should occur before OnContextCreated.

there is no CefBrowser param through this way...

[magreenblatt]

You can pass extra_info parameters to CreateBrowser which are then delivered to CefRenderProcessHandler::OnBrowserCreated. That call should occur before OnContextCreated.

there is no CefBrowser param through this way...

Sorry, I don't understand what you mean.

[Streamlet]

Oh, I'm sorry. There is a browser param, but browser->GetMainFrame() returns nullptr.
so I cannot do browser->GetMainFrame()->SendProcessMessage()

[magreenblatt]

Oh, I'm sorry. There is a browser param, but browser->GetMainFrame() returns nullptr.
so I cannot do browser->GetMainFrame()->SendProcessMessage()

And why do you want to do that? OnBrowserCreated is already in the renderer process. You said previously:

My purpose is send infomation about JS injection to render process before its OnContextCreated, and in OnContextCreated I will put JS variables into context.

[Streamlet]

And why do you want to do that? OnBrowserCreated is already in the renderer process. You said previously:

Oh, I understand now. Tnank you, I will try it.
(I'm sorry that I thought your solution is similar with what Czarek said in the 2'nd posts and misunderstood you.)

[Streamlet]

When a renderer process is created for a DevTools, the extra_info doesn't contains any data?
will DevTools create a new CefBrowser object?

[magreenblatt]

When a renderer process is created for a DevTools, the extra_info doesn't contains any data?
will DevTools create a new CefBrowser object?

This was recently changed to pass the DevTools browser the same extra_info as the parent browser. Commit: https://bitbucket.org/chromiumembedded/ ... a1f6be6319