#!/usr/bin/env python
# -*- coding: UTF-8 -*
import time

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.common.exceptions import NoSuchElementException, TimeoutException
from selenium.webdriver.common.action_chains import ActionChains

def scroll_page(url, browser=‘chrome‘):
    if browser==‘chrome‘:
        driver = webdriver.Chrome()
    else:
        driver = webdriver.Firefox() #右键异常 ActionChains(driver).context_click(e).perform()
    # driver = webdriver.PhantomJS()  #可截长图！可是加载长网页时间超长？
    driver.set_window_size(1200, 900)
    driver.get(url) # Load page
    start = time.time()
    
    print driver.title    
    driver.execute_script("""
        (function () {
            var y = 0;
            var step = 1000;  //100
            window.scroll(0, 0);

            function f() {
                if (y < document.body.scrollHeight) {
                    y += step;
                    window.scroll(0, y);
                    setTimeout(f, 100); //100  递归循环调用
                } 
                else {
                    if(document.title.indexOf("scroll-done") < 0){  //-1 找不到,还没执行下文的driver.execute_script
                    y -= step;
                    window.scroll(0, y);
                    setTimeout(f, 100); //100                    
                    //window.scroll(0, 0);
                    //document.title += "scroll-done";
                    }
                    //else{
                    //window.scroll(0, 0);
                    //}
                }
            }

            setTimeout(f, 1000);  //1000
        })();
    """)
    #拉到最后 出现元素“没有更多了”
    WebDriverWait(driver, 500).until(lambda x: x.find_element_by_xpath(‘//div[@style="text-align:center"]/em‘))  #或者引发 TimeoutException
    
    #停止上面的js到终点再上拉 循环
    driver.execute_script("""
        (function () {

            function f() {
                document.title += " scroll-done";
            }

            setTimeout(f, 1000);
        })();
    """)
    # <div class="js-infinite-layout">
        # <div class="js-infinite-item">
            # Jetbrains公司正式发布Pycharm 5
    rst =  driver.find_element_by_xpath(‘//div[@class="js-infinite-item"][last()]//div[@class="header"]‘).text #不能在path内部写入 text()
    print rst
    if rst != u‘Jetbrains公司正式发布Pycharm 5‘:
        raise RuntimeError(‘wrong!!!‘)
    print time.time()-start
    print driver.title
    # time.sleep(3)  #执行js也需要时间
    WebDriverWait(driver, 10).until(lambda x: x.title == u‘编程派 | Coding Python scroll-done‘)  #或者引发 TimeoutException
    print driver.title  
    return driver

import win32con
import win32gui
import win32process
import psutil

def get_hwnds_for_pid (pid):
    def callback (hwnd, hwnds):
        if win32gui.IsWindowVisible(hwnd) and win32gui.IsWindowEnabled(hwnd):
            _, found_pid = win32process.GetWindowThreadProcessId(hwnd)
            if found_pid == pid:
                hwnds.append(hwnd)
            return True
    hwnds = []
    win32gui.EnumWindows(callback, hwnds)
    return hwnds


def set_process_foreground(pid_part_name, pid_window_text):
    pids_target = []
    for pid in psutil.pids():
        p = psutil.Process(pid)
        if pid_part_name in p.name().lower(): #‘chrome.exe‘  ‘EXCEL.EXE‘
            pids_target.append(pid)
            
    for pid in pids_target:
        for hwnd in get_hwnds_for_pid(pid):
            # 92292 chrome.exe 137328 编程派 | Coding Python - Google Chrome
            # EXCEL.EXE 857830 Microsoft Excel - Book1.xlsx
            # 90644 firefox.exe 595556 编程派 | Coding Python scroll-done - Mozilla Firefox
            
            if pid_window_text.encode(‘gbk‘) in win32gui.GetWindowText(hwnd):  
                print pid, psutil.Process(pid).name(), hwnd, win32gui.GetWindowText(hwnd)
                win32gui.SetForegroundWindow(hwnd)
                return
    raise RuntimeError(‘process not found‘)

from autopy import key, mouse
def save_result(driver): 
    time_for_filename = time.strftime(‘%H%M%S‘)
    with open(‘%s.html‘%time_for_filename,‘wb‘) as f:
        f.write(driver.page_source.encode(‘utf-8‘))
        
    # e =  driver.find_element_by_xpath(‘//img[@src="/static/images/logo.png"]‘)
    # ActionChains(driver).context_click(e).perform()  
    # time.sleep(1.5)
    # esc 退出右键菜单
    # key.tap(key.K_ESCAPE)
    # driver.set_window_position(0,0)
    # window_position = driver.get_window_position() #  {u‘x‘: 10, u‘y‘: 10}
    # mouse.move(int(window_position[‘x‘]+150), int(window_position[‘y‘]+150)) 
    #右键再左键 避免错误点开链接
    # mouse.click(mouse.RIGHT_BUTTON)     
    # mouse.click(mouse.LEFT_BUTTON)
    
    # 关键是浏览器位于foreground
    set_process_foreground(driver.name,driver.title)
    key.tap(‘s‘, key.MOD_CONTROL)
    time.sleep(1.5)    
    key.type_string(time_for_filename)
    time.sleep(0.5)      
    key.tap(key.K_RETURN)   
    
    driver.save_screenshot(‘%s.png‘%time_for_filename)
    # driver.close()

if __name__ == "__main__":
    browser = ‘chrome‘
    # browser = ‘firefox‘
    url = "http://codingpy.com"
    driver = scroll_page(url,browser)
    save_result(driver)
    print ‘All DONE‘