how to pass argument to child process when creating browser

[Marcin]

as follow up of the thread :
viewtopic.php?f=6&t=12570
which I consider closed I got another question.

As I need to differentiate processes packed in one executable as required by CEF3, I need to pass a parameter to the child process. I successfully did it using OnBeforeSubProcessLaunch and AppendSwitch and I test is using HasSwitch in the child process.

So far, so good.

The problem I am facing is, that I want to "differentiate" (i.e pass some extra data) child processes when calling CefBrowserHost::CreateBrowser however OnBeforeSubProcessLaunch of my CefApp has only commad_line parameter, so I do not know, what is the CefClient I created for CefBrowserHost::CreateBrowser so I do not know whether I should append or not my switch to the command line.

any advice ?

[magreenblatt]

See here for your options.

[Marcin]

Yep, I know the options, however the problem is I need to be notified before the OnContextCreated is called as I want to do JavaScript binding.

so I though passing switch in command_line would be the best, but I do not know how to link it to the CefClient ...

[magreenblatt]

What are you trying to customize in OnContextCreated? What size/type of data do you need to pass from the browser process?

[Marcin]

I need just one integer value to have different implementations of CefApp, i.e. different JS binding, so just wanto somhow to pass the value once I call CreateBrowser ...

In one implementaion of Browser I have different native JavaScript objects and in another one different JavaScript objects. To my understanding, OnContextCreated is the place to do it, though all the browsers "looks" the same for me ...

[magreenblatt]

I need just one integer value to have different implementations of CefApp, i.e. different JS binding, so just wanto somhow to pass the value once I call CreateBrowser ...

The difficulty with using command-line arguments is that multiple browsers may be hosted in the same renderer process if they share the same origin, and so you wouldn't get a different command-line value for those other browsers that share the same process. Also, when the origin changes for an existing browser a new renderer process may be created.

A few possibilities:
1. Load a different URL in each browser as a means of differentiating them. For example, add a query parameter that specifies your integer value.
2. Include the integer value in your HTML/JS code and pass it to a JS function that initializes the API. For example, var api = window.getMyApi(integer).

[Marcin]

ok, thx I'll work out some workaround ...

[mkoubaa]

How about writing it to a file in %TEMP% right before calling 'createbrowser', and read it and add it to the CefApp object which you pass into CefExecuteProcess.

It should work as long as the time between one createbrowser and the next is longer than the time it takes for your application to reach 'CefExecuteProcess'.