首先本文要实现的是打开指定网页，右击保存为指定名.txt，网页保存类型为txt，后续再读取txt处理。
好下面准备工具：
1.spyxx（安装有VS的同学可以直接在vs安装目录下找到：\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\spyxx.exe）
查看spyxx窗口，找到另存为对话框窗口句柄。可知道每个以下子窗口句柄怎么通过win32api找到：
2.确保已安装：selenium， win32gui, win32api, win32con（可通过相应pip安装）
3.下载geckodriver.exe （https://github.com/mozilla/geckodriver/releases/）下载完成后拷贝至Mozilla Firefox安装目录（C:\Program Files\Mozilla Firefox），确保Mozilla Firefox安装目录在环境变量PATH中。
4. 代码：
from selenium import webdriver
import win32gui, win32api, win32con
def save_url(driver, URL_BASE , saved_file_name):
driver.get(URL_BASE)
win32api.keybd_event(VK_CODE['ctrl'], 0, 0)
win32api.keybd_event(VK_CODE['s'], 0, 0)
win32api.keybd_event(VK_CODE['ctrl'], 0, win32con.KEYEVENTF_KEYUP,0)
win32api.keybd_event(VK_CODE['s'], 0, win32con.KEYEVENTF_KEYUP,0)
time.sleep(0.5)
hld=win32gui.FindWindow("#32770", u"另存为")
win32gui.SetForegroundWindow(hld)
#left, top, right, bottom = win32gui.GetWindowRect(hld)
#hwndChildList = []
#win32gui.EnumChildWindows(hld, lambda hwnd, param: param.append(hwnd), hwndChildList)
#show_windows(hwndChildList)
#获取文件名输入框
a1 = win32gui.FindWindowEx(hld,None,'DUIViewWndClassName',None)
a2 = win32gui.FindWindowEx(a1,None,"DirectUIHWND",None)
a3 = win32gui.FindWindowEx(a2,None,"FloatNotifySink",None)
a4 = win32gui.FindWindowEx(a3,None,"ComboBox",None)
hwnd_filename = win32gui.FindWindowEx(a4,None,"Edit",None)
a31 = win32gui.FindWindowEx(a2,a3,"FloatNotifySink",None)
a32 = win32gui.FindWindowEx(a2,a31,"FloatNotifySink",None)
a5 = win32gui.FindWindowEx(a32,None,"ComboBox",None)
time.sleep(0.5)
#输入保存文件名
win32gui.SendMessage(hwnd_filename, win32con.WM_SETFOCUS,0,0)
win32gui.SendMessage(hwnd_filename, win32con.WM_SETTEXT, None, saved_file_name)
#修改保存类型
win32api.SendMessage(a5, win32con.CB_SHOWDROPDOWN , 1,0)
win32api.SendMessage(a5, win32con.CB_SETCURSEL , 2,0) #选择第二个下拉单
win32gui.SendMessage(a5, win32con.WM_SETFOCUS,0,0)
win32gui.SendMessage(a5, win32con.WM_LBUTTONDOWN, 0, 0)
win32gui.SendMessage(a5, win32con.WM_LBUTTONUP, 0, 0)
#win32gui.SendMessage(a5, win32con.WM_KEYDOWN, win32con.VK_RETURN, 0)
#win32gui.SendMessage(a5, win32con.WM_KEYUP, win32con.VK_RETURN, 0)
#win32gui.SendMessage(a5, win32con.CBN_SELCHANGE)
#win32gui.SendMessage(a5, win32con.CBN_SELENDOK)
win32gui.PostMessage(hwnd_filename, win32con.WM_KEYDOWN, win32con.VK_RETURN, 0)
win32gui.PostMessage(hwnd_filename, win32con.WM_KEYUP, win32con.VK_RETURN, 0)
time.sleep(0.5)
#点击保存
hwnd_save = win32gui.FindWindowEx(hld,None,"Button",None)
win32gui.PostMessage(hwnd_save, win32con.WM_LBUTTONDOWN, win32con.MK_LBUTTON, 0)
win32gui.PostMessage(hwnd_save, win32con.WM_LBUTTONUP, win32con.MK_LBUTTON, 0)
#driver.quit()
下面就可以开始了：
driver = webdriver.Firefox()
save_url(driver, URL_BASE, saved_file_name)