Sample cefpython

test.py

# Hello world example. Doesn't depend on any third party GUI framework.
# Tested with CEF Python v55.3+.

from cefpython3 import cefpython as cef
import numpy as np
import cv2
import platform
import sys

VIEWPORT_SIZE = (359, 640)
PRELOAD = """
(function () {
  document.body.style.overflow = "hidden";
})();
"""


class BrowserHandler(object):
    def OnLoadingStateChange(self, browser, is_loading, **_):
        """Called when the loading state has changed."""
        if not is_loading:
            browser.ExecuteJavascript(PRELOAD)

    def OnPaint(self, browser, element_type, paint_buffer, **_):
        if element_type == cef.PET_VIEW:
            buffer = paint_buffer.GetString(mode="bgra", origin="top-left")
            bytes = np.fromstring(buffer, np.uint8).reshape((640, 359, 4))
            bytes = cv2.cvtColor(bytes, cv2.COLOR_BGRA2BGR)
            cv2.imshow('image', bytes)

    def GetViewRect(self, rect_out, **_):
        # rect_out --> [x, y, width, height]
        rect_out.extend([0, 0, VIEWPORT_SIZE[0], VIEWPORT_SIZE[1]])
        return True


def main():
    check_versions()
    sys.excepthook = cef.ExceptHook  # To shutdown all CEF processes on error
    cef.Initialize(settings={"windowless_rendering_enabled": True})

    parent_window_handle = 0
    window_info = cef.WindowInfo()
    window_info.SetAsOffscreen(parent_window_handle)

    browser = cef.CreateBrowserSync(window_info=window_info, url="https://apps.facebook.com/611307059053310")
    browser.SetClientHandler(BrowserHandler())
    browser.SendFocusEvent(True)
    browser.WasResized()

    cef.MessageLoop()
    cef.Shutdown()

def check_versions():
    print("[hello_world.py] CEF Python {ver}".format(ver=cef.__version__))
    print("[hello_world.py] Python {ver} {arch}".format(
          ver=platform.python_version(), arch=platform.architecture()[0]))
    assert cef.__version__ >= "55.3", "CEF Python v55.3+ required to run this"

if __name__ == '__main__':
    main()