python设置windows桌面壁纸的实现代码

# -*- coding: utf-8 -*-

from __future__ import unicode_literals
import image
import datetime
import win32gui,win32con,win32api
import re
from httpwrapper import sendrequest

storefolder = "c:\\dayimage"

def setwallpaperfrombmp(imagepath):
    k = win32api.regopenkeyex(win32con.hkey_current_user,"control panel\\desktop",0,win32con.key_set_value)
    win32api.regsetvalueex(k, "wallpaperstyle", 0, win32con.reg_sz, "2") #2拉伸适应桌面,0桌面居中
    win32api.regsetvalueex(k, "tilewallpaper", 0, win32con.reg_sz, "0")
    win32gui.systemparametersinfo(win32con.spi_setdeskwallpaper,imagepath, 1+2)

def setwallpaper(imagepath):
    """
    given a path to an image, convert it to bmp and set it as wallpaper
    """
    bmpimage = image.open(imagepath)
    newpath = storefolder + '\\mywallpaper.bmp'
    bmpimage.save(newpath, "bmp")
    setwallpaperfrombmp(newpath)

def getpicture():
    url = "http://photography.nationalgeographic.com/photography/photo-of-the-day/"
    h = sendrequest(url)
    if h.getsource():
        r = re.findall('<div class="download_link"><a href="(.*?)">download',h.getsource())
        if r:
            return sendrequest(r[0]).getsource()
        else:
            print "解析图片地址出错，请检查正则表达式是否正确"
            return none

def setwallpaperoftoday():
    img = getpicture()
    if img:
        path = storefolder + "\\%s.jpg" % datetime.date.today()
        f = open(path,"wb")
        f.write(img)
        f.close()
        setwallpaper(path)

setwallpaperoftoday()
print 'wallpaper set ok!'

其中的httpwrapper是我写的一个http访问的封装：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#-------------------------------------------------------------------------------
# name: 对http访问的封装
#
# author: qianlifeng
#
# created: 10-02-2012
#-------------------------------------------------------------------------------

import base64
import urllib
import urllib2
import time
import re
import sys

class sendrequest:
  """
  网页请求增强类
  sendrequest('http://xxx.com',data=dict, type='post', auth='base',user='xxx', password='xxx')
  """
  def __init__(self, url, data=none, method='get', auth=none, user=none, password=none, cookie = none, **header):
    """
    url: 请求的url，不能为空
    date: 需要post的内容，必须是字典
    method: get 或者 post，默认为get
    auth: 'base' 或者 'cookie'
    user: 用于base认证的用户名
    password: 用于base认证的密码
    cookie: 请求附带的cookie，一般用于登录后的认证
    其他头信息:
    e.g. referer='www.sina.com.cn'
    """

    self.url = url
    self.data = data
    self.method = method
    self.auth = auth
    self.user = user
    self.password = password
    self.cookie = cookie

    if 'referer' in header:
        self.referer = header[referer]
    else:
        self.referer = none

    if 'user-agent' in header:
        self.user_agent = header[user-agent]
    else:
## self.user_agent = 'mozilla/5.0 (windows nt 5.1; rv:8.0) gecko/20100101 firefox/8.0'
        self.user_agent = 'mozilla/5.0 (iphone; u; cpu iphone os 3_0 like mac os x; en-us) applewebkit/528.18 (khtml, like gecko) version/4.0 mobile/7a341 safari/528.16'

    self.__setuprequest()
    self.__sendrequest()

  def __setuprequest(self):

    if self.url is none or self.url == '':
        raise 'url 不能为空!'

    #访问方式设置
    if self.method.lower() == 'post':
        self.req = urllib2.request(self.url, urllib.urlencode(self.data))

    elif self.method.lower() == 'get':
        if self.data == none:
            self.req = urllib2.request(self.url)
        else:
            self.req = urllib2.request(self.url + '?' + urllib.urlencode(self.data))

    #设置认证信息
    if self.auth == 'base':
        if self.user == none or self.password == none:
            raise 'the user or password was not given!'
        else:
            auth_info = base64.encodestring(self.user + ':' + self.password).replace('\n','')
            auth_info = 'basic ' + auth_info
            self.req.add_header("authorization", auth_info)

    elif self.auth == 'cookie':
        if self.cookie == none:
            raise 'the cookie was not given!'
        else:
            self.req.add_header("cookie", self.cookie)

    if self.referer:
        self.req.add_header('referer', self.referer)
    if self.user_agent:
        self.req.add_header('user-agent', self.user_agent)

  def __sendrequest(self):

    try:
      self.res = urllib2.urlopen(self.req)
      self.source = self.res.read()
      self.code = self.res.getcode()
      self.head_dict = self.res.info().dict
      self.res.close()
    except:
      print "error: httpwrapper=>_sendrequest ", sys.exc_info()[1]

  def getresponsecode(self):
    """
    得到服务器返回的状态码(200表示成功,404网页不存在)
    """
    return self.code

  def getsource(self):
    """
    得到网页源代码，需要解码后在使用
    """
    if "source" in dir(self):
        return self.source
    return u''

  def getheaderinfo(self):
    """
    u'得到响应头信息'
    """
    return self.head_dict

  def getcookie(self):
    """
    得到服务器返回的cookie，一般用于登录后续操作
    """
    if 'set-cookie' in self.head_dict:
      return self.head_dict['set-cookie']
    else:
      return none

  def getcontenttype(self):
    """
    得到返回类型
    """
    if 'content-type' in self.head_dict:
      return self.head_dict['content-type']
    else:
      return none

  def getcharset(self):
    """
    尝试得到网页的编码
    如果得不到返回none
    """
    contenttype = self.getcontenttype()
    if contenttype is not none:
        index = contenttype.find("charset")
        if index > 0:
           return contenttype[index+8:]
    return none

  def getexpirestime(self):
    """
    得到网页过期时间
    """
    if 'expires' in self.head_dict:
      return self.head_dict['expires']
    else:
      return none

  def getservername(self):
    """
    得到服务器名字
    """
    if 'server' in self.head_dict:
      return self.head_dict['server']
    else:
      return none

__all__ = [sendrequest,]

if __name__ == '__main__':
    b = sendrequest("http://www.baidu.com")
    print b.getsource()