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# An example of embedding the CEF browser in a PyQt4 application.
# Tested with PyQt "4.9.1".
# Command for installing PyQt4: "sudo apt-get install python-qt4".
# The official CEF Python binaries come with tcmalloc hook
# disabled. But if you've built custom binaries and kept tcmalloc
# hook enabled, then be aware that in such case it is required
# for the cefpython module to be the very first import in
# python scripts. See Issue 73 in the CEF Python Issue Tracker
# for more details.
import ctypes, os, sys
libcef_so = os.path.join(os.path.dirname(os.path.abspath(__file__)),\
'libcef.so')
if os.path.exists(libcef_so):
# Import local module
ctypes.CDLL(libcef_so, ctypes.RTLD_GLOBAL)
if 0x02070000 <= sys.hexversion < 0x03000000:
import cefpython_py27 as cefpython
else:
raise Exception("Unsupported python version: %s" % sys.version)
else:
# Import from 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)
pass
def closeEvent(self, event):
self.mainFrame.browser.CloseBrowser()
class MainFrame(QtGui.QX11EmbedContainer):
browser = None
plug = None
def __init__(self, parent=None):
super(MainFrame, self).__init__(parent)
# QX11EmbedContainer provides an X11 window. The CEF
# browser can be embedded only by providing a GtkWidget
# pointer. So we're embedding a GtkPlug inside the X11
# window. In latest CEF trunk it is possible to embed
# the CEF browser by providing X11 window id. So it will
# be possible to remove the GTK dependency from CEF
# Python in the future.
gtkPlugPtr = cefpython.WindowUtils.gtk_plug_new(\
int(self.winId()))
print("[pyqt.py] MainFrame: GDK Native Window id: "+str(self.winId()))
print("[pyqt.py] MainFrame: GTK Plug ptr: "+str(gtkPlugPtr))
"""
Embedding GtkPlug is also possible with the pygtk module.
---------------------------------------------------------
self.plug = gtk.Plug(self.winId())
import re
m = re.search("GtkPlug at 0x(\w+)", str(self.plug))
hexId = m.group(1)
gtkPlugPtr = int(hexId, 16)
...
plug.show()
self.show()
---------------------------------------------------------
"""
windowInfo = cefpython.WindowInfo()
# Need to pass to CEF the GtkWidget* pointer
windowInfo.SetAsChild(gtkPlugPtr)
# Linux requires adding "file://" for local files,
# otherwise /home/some will be replaced as http://home/some
self.browser = cefpython.CreateBrowserSync(windowInfo,
browserSettings={},
navigateUrl="file://"+GetApplicationPath("example.html"))
cefpython.WindowUtils.gtk_widget_show(gtkPlugPtr)
self.show()
def moveEvent(self, event):
# cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)
pass
def resizeEvent(self, event):
# cefpython.WindowUtils.OnSize(int(self.winId()), 0, 0, 0)
pass
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.
# (The behavior described above was tested on Windows
# with pyqt 4.8, maybe this is not true anymore,
# test it TODO)
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 = {
"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.
"release_dcheck_enabled": True, # Enable only when debugging.
# 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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