pythonpython-multithreadingcefpython

How to call MessageLoopWork in cefpython?

I made a simple offscreen renderer with cefpython.

I used cefpython.MessageLoop() but I would like to execute a javascript function with browser.GetFocusedFrame().ExecuteFunctionwhich must be called from main UI thread.

Is there a way to set a callback on cefpython's message loop?

Alternatively I could use MessageLoopWork, but I don't know how. I tried to call it in a separate thread but it does not work:

import threading

def main_loop():
    cefpython.MessageLoopWork()
    threading.Timer(0.01, main_loop).start()

threading.Timer(0.01, main_loop).start()

I get the following error:

[0324/174806:ERROR_REPORT:context.cc(146)] Check failed: false. called on invalid thread
Solution

  • Use the cefpython.PostTask() function to post tasks on various CEF threads. See: https://code.google.com/p/cefpython/wiki/cefpython#PostTask_(int_threadId,_object_func_[,args..])_(void) and Issue 61. It's available since version 31.0.

    The wxpython.py example shows how to use both timer with MessageLoopWork() and MessageLoop().