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# An example of embedding CEF browser in a PyQt4 application.

# Tested with PyQt 4.10.3 (Qt 4.8.5).

import os, sys

libcef_dll = os.path.join(os.path.dirname(os.path.abspath(__file__)),

'libcef.dll')

if os.path.exists(libcef_dll):

# Import a local module

if (2,7) <= sys.version_info < (2,8):

import cefpython_py27 as cefpython

elif (3,4) <= sys.version_info < (3,4):

import cefpython_py34 as cefpython

else:

raise Exception("Unsupported python version: %s" % sys.version)

else:

# Import an installed package

from cefpython3 import cefpython

from PyQt4 import QtGui

from PyQt4 import QtCore

def GetApplicationPath(file=None):

import re, os, platform

# On Windows after downloading file and calling Browser.GoForward(),

# current working directory is set to %UserProfile%.

# Calling os.path.dirname(os.path.realpath(__file__))

# returns for eg. "C:\Users\user\Downloads". A solution

# is to cache path on first call.

if not hasattr(GetApplicationPath, "dir"):

if hasattr(sys, "frozen"):

dir = os.path.dirname(sys.executable)

elif "__file__" in globals():

dir = os.path.dirname(os.path.realpath(__file__))

else:

dir = os.getcwd()

GetApplicationPath.dir = dir

# If file is None return current directory without trailing slash.

if file is None:

file = ""

# Only when relative path.

if not file.startswith("/") and not file.startswith("\\") and (

not re.search(r"^[\w-]+:", file)):

path = GetApplicationPath.dir + os.sep + file

if platform.system() == "Windows":

path = re.sub(r"[/\\]+", re.escape(os.sep), path)

path = re.sub(r"[/\\]+$", "", path)

return path

return str(file)

def ExceptHook(excType, excValue, traceObject):

import traceback, os, time, codecs

# This hook does the following: in case of exception write it to

# the "error.log" file, display it to the console, shutdown CEF

# and exit application immediately by ignoring "finally" (os._exit()).

errorMsg = "\n".join(traceback.format_exception(excType, excValue,

traceObject))

errorFile = GetApplicationPath("error.log")

try:

appEncoding = cefpython.g_applicationSettings["string_encoding"]

except:

appEncoding = "utf-8"

if type(errorMsg) == bytes:

errorMsg = errorMsg.decode(encoding=appEncoding, errors="replace")

try:

with codecs.open(errorFile, mode="a", encoding=appEncoding) as fp:

fp.write("\n[%s] %s\n" % (

time.strftime("%Y-%m-%d %H:%M:%S"), errorMsg))

except:

print("[pyqt.py] WARNING: failed writing to error file: %s" % (

errorFile))

# Convert error message to ascii before printing, otherwise

# you may get error like this:

# | UnicodeEncodeError: 'charmap' codec can't encode characters

errorMsg = errorMsg.encode("ascii", errors="replace")

errorMsg = errorMsg.decode("ascii", errors="replace")

print("\n"+errorMsg+"\n")

cefpython.QuitMessageLoop()

cefpython.Shutdown()

os._exit(1)

class MainWindow(QtGui.QMainWindow):

mainFrame = None

def __init__(self):

super(MainWindow, self).__init__(None)

self.createMenu()

self.mainFrame = MainFrame(self)

self.setCentralWidget(self.mainFrame)

self.resize(1024, 768)

self.setWindowTitle('PyQT CEF 3 example')

self.setFocusPolicy(QtCore.Qt.StrongFocus)

def createMenu(self):

menubar = self.menuBar()

filemenu = menubar.addMenu("&File")

filemenu.addAction(QtGui.QAction("Open", self))

filemenu.addAction(QtGui.QAction("Exit", self))

aboutmenu = menubar.addMenu("&About")

def focusInEvent(self, event):

cefpython.WindowUtils.OnSetFocus(int(self.centralWidget().winId()), 0, 0, 0)

def closeEvent(self, event):

self.mainFrame.browser.CloseBrowser()

class MainFrame(QtGui.QWidget):

browser = None

def __init__(self, parent=None):

super(MainFrame, self).__init__(parent)

windowInfo = cefpython.WindowInfo()

windowInfo.SetAsChild(int(self.winId()))

self.browser = cefpython.CreateBrowserSync(windowInfo,

browserSettings={},

navigateUrl=GetApplicationPath("example.html"))

self.show()

def moveEvent(self, event):

cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)

def resizeEvent(self, event):

cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)

class CefApplication(QtGui.QApplication):

timer = None

def __init__(self, args):

super(CefApplication, self).__init__(args)

self.createTimer()

def createTimer(self):

self.timer = QtCore.QTimer()

self.timer.timeout.connect(self.onTimer)

self.timer.start(10)

def onTimer(self):

# The proper way of doing message loop should be:

# 1. In createTimer() call self.timer.start(0)

# 2. In onTimer() call MessageLoopWork() only when

# QtGui.QApplication.instance()->hasPendingEvents() returns False.

# But... there is a bug in Qt, hasPendingEvents() returns always true.

cefpython.MessageLoopWork()

def stopTimer(self):

# Stop the timer after Qt message loop ended, calls to MessageLoopWork()

# should not happen anymore.

self.timer.stop()

if __name__ == '__main__':

print("[pyqt.py] PyQt version: %s" % QtCore.PYQT_VERSION_STR)

print("[pyqt.py] QtCore version: %s" % QtCore.qVersion())

# Intercept python exceptions. Exit app immediately when exception

# happens on any of the threads.

sys.excepthook = ExceptHook

# Application settings

settings = {

# "cache_path": "webcache/", # Disk cache

"debug": True, # cefpython debug messages in console and in log_file

"log_severity": cefpython.LOGSEVERITY_INFO, # LOGSEVERITY_VERBOSE

"log_file": GetApplicationPath("debug.log"), # Set to "" to disable.

# This directories must be set on Linux

"locales_dir_path": cefpython.GetModuleDirectory()+"/locales",

"resources_dir_path": cefpython.GetModuleDirectory(),

"browser_subprocess_path": "%s/%s" % (

cefpython.GetModuleDirectory(), "subprocess")

}

# Command line switches set programmatically

switches = {

# "proxy-server": "socks5://127.0.0.1:8888",

# "enable-media-stream": "",

# "--invalid-switch": "" -> Invalid switch name

}

cefpython.Initialize(settings, switches)

app = CefApplication(sys.argv)

mainWindow = MainWindow()

mainWindow.show()

app.exec_()

app.stopTimer()

# Need to destroy QApplication(), otherwise Shutdown() fails.

# Unset main window also just to be safe.

del mainWindow

del app

cefpython.Shutdown()

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