cefpython/examples/pywin32.py at refs/heads/cefpython147 · linesight/cefpython · GitHub

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# Example of embedding CEF browser using PyWin32 library.

# Tested with pywin32 version 221 and CEF Python v57.0+.

# Usage:

# python pywin32.py

# python pywin32.py --multi-threaded

# By passing --multi-threaded arg CEF will run using multi threaded

# message loop which has best performance on Windows. However there

# is one issue with it on exit, see "Known issues" below. See also

# docs/Tutorial.md and the "Message loop" section.

# Known issues:

# - Crash on exit with multi threaded message loop (Issue #380)

from cefpython3 import cefpython as cef

import distutils.sysconfig

import math

import os

import platform

import sys

import win32api

import win32con

import win32gui

# Globals

WindowUtils = cef.WindowUtils()

g_multi_threaded = False

def main():

command_line_args()

check_versions()

sys.excepthook = cef.ExceptHook # To shutdown all CEF processes on error

settings = {

"multi_threaded_message_loop": g_multi_threaded,

}

cef.Initialize(settings=settings)

window_proc = {

win32con.WM_CLOSE: close_window,

win32con.WM_DESTROY: exit_app,

win32con.WM_SIZE: WindowUtils.OnSize,

win32con.WM_SETFOCUS: WindowUtils.OnSetFocus,

win32con.WM_ERASEBKGND: WindowUtils.OnEraseBackground

}

window_handle = create_window(title="PyWin32 example",

class_name="pywin32.example",

width=800,

height=600,

window_proc=window_proc,

icon="resources/chromium.ico")

window_info = cef.WindowInfo()

window_info.SetAsChild(window_handle)

if g_multi_threaded:

# When using multi-threaded message loop, CEF's UI thread

# is no more application's main thread. In such case browser

# must be created using cef.PostTask function and CEF message

# loop must not be run explicitilly.

cef.PostTask(cef.TID_UI,

create_browser,

window_info,

{},

"https://www.google.com/")

win32gui.PumpMessages()

else:

create_browser(window_info=window_info,

settings={},

url="https://www.google.com/")

cef.MessageLoop()

cef.Shutdown()

def command_line_args():

global g_multi_threaded

if "--multi-threaded" in sys.argv:

sys.argv.remove("--multi-threaded")

print("[pywin32.py] Message loop mode: CEF multi-threaded"

" (best performance)")

g_multi_threaded = True

else:

print("[pywin32.py] Message loop mode: CEF single-threaded")

if len(sys.argv) > 1:

print("ERROR: Invalid args passed."

" For usage see top comments in pywin32.py.")

sys.exit(1)

def check_versions():

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

print("ERROR: This example is for Windows platform only")

sys.exit(1)

print("[pywin32.py] CEF Python {ver}".format(ver=cef.__version__))

print("[pywin32.py] Python {ver} {arch}".format(

ver=platform.python_version(), arch=platform.architecture()[0]))

# PyWin32 version

python_lib = distutils.sysconfig.get_python_lib(plat_specific=1)

with open(os.path.join(python_lib, "pywin32.version.txt")) as fp:

pywin32_version = fp.read().strip()

print("[pywin32.py] pywin32 {ver}".format(ver=pywin32_version))

assert tuple(int(x) for x in cef.__version__.split(".")) >= (57, 0), "CEF Python v57.0+ required to run this"

def create_browser(window_info, settings, url):

assert(cef.IsThread(cef.TID_UI))

cef.CreateBrowserSync(window_info=window_info,

settings=settings,

url=url)

def create_window(title, class_name, width, height, window_proc, icon):

# Register window class

wndclass = win32gui.WNDCLASS()

wndclass.hInstance = win32api.GetModuleHandle(None)

wndclass.lpszClassName = class_name

wndclass.style = win32con.CS_VREDRAW | win32con.CS_HREDRAW

wndclass.hbrBackground = win32con.COLOR_WINDOW

wndclass.hCursor = win32gui.LoadCursor(0, win32con.IDC_ARROW)

wndclass.lpfnWndProc = window_proc

atom_class = win32gui.RegisterClass(wndclass)

assert(atom_class != 0)

# Center window on screen.

screenx = win32api.GetSystemMetrics(win32con.SM_CXSCREEN)

screeny = win32api.GetSystemMetrics(win32con.SM_CYSCREEN)

xpos = int(math.floor((screenx - width) / 2))

ypos = int(math.floor((screeny - height) / 2))

if xpos < 0:

xpos = 0

if ypos < 0:

ypos = 0

# Create window

window_style = (win32con.WS_OVERLAPPEDWINDOW | win32con.WS_CLIPCHILDREN

| win32con.WS_VISIBLE)

window_handle = win32gui.CreateWindow(class_name, title, window_style,

xpos, ypos, width, height,

0, 0, wndclass.hInstance, None)

assert(window_handle != 0)

# Window icon

icon = os.path.abspath(icon)

if not os.path.isfile(icon):

icon = None

if icon:

# Load small and big icon.

# WNDCLASSEX (along with hIconSm) is not supported by pywin32,

# we need to use WM_SETICON message after window creation.

# Ref:

# 1. http://stackoverflow.com/questions/2234988

# 2. http://blog.barthe.ph/2009/07/17/wmseticon/

bigx = win32api.GetSystemMetrics(win32con.SM_CXICON)

bigy = win32api.GetSystemMetrics(win32con.SM_CYICON)

big_icon = win32gui.LoadImage(0, icon, win32con.IMAGE_ICON,

bigx, bigy,

win32con.LR_LOADFROMFILE)

smallx = win32api.GetSystemMetrics(win32con.SM_CXSMICON)

smally = win32api.GetSystemMetrics(win32con.SM_CYSMICON)

small_icon = win32gui.LoadImage(0, icon, win32con.IMAGE_ICON,

smallx, smally,

win32con.LR_LOADFROMFILE)

win32api.SendMessage(window_handle, win32con.WM_SETICON,

win32con.ICON_BIG, big_icon)

win32api.SendMessage(window_handle, win32con.WM_SETICON,

win32con.ICON_SMALL, small_icon)

return window_handle

def close_window(window_handle, message, wparam, lparam):

browser = cef.GetBrowserByWindowHandle(window_handle)

browser.CloseBrowser(True)

# OFF: win32gui.DestroyWindow(window_handle)

return win32gui.DefWindowProc(window_handle, message, wparam, lparam)

def exit_app(*_):

win32gui.PostQuitMessage(0)

return 0

if __name__ == '__main__':

main()

cefpython/examples/pywin32.py at refs/heads/cefpython147 · linesight/cefpython · GitHub

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