Script to download desktop background pictures from URL

import os

ps_content=r'''

# script parameters, feel free to change it 

$downloadFolder = "C:\Users\john\Desktop\picture"

$searchFor = "red rose"

$nrOfImages = 20

​

# create a WebClient instance that will handle Network communications 

$webClient = New-Object System.Net.WebClient

​

# load System.Web so we can use HttpUtility

Add-Type -AssemblyName System.Web

​

# URL encode our search query

$searchQuery = [System.Web.HttpUtility]::UrlEncode($searchFor)

​

$url = "http://www.bing.com/images/search?q=$searchQuery&first=0&count=$nrOfImages&qft=+filterui%3alicense-L2_L3_L4"

​

# get the HTML from resulting search response

$webpage = $webclient.DownloadString($url)

​

# use a 'fancy' regular expression to finds Urls terminating with '.jpg' or '.png'

$regex = "[(http(s)?):\/\/(www\.)?a-z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-z0-9@:%_\+.~#?&//=]*)((.jpg(\/)?)|(.png(\/)?)){1}(?!([\w\/]+))"

​

$listImgUrls = $webpage | Select-String -pattern $regex -Allmatches | ForEach-Object {$_.Matches} | Select-Object $_.Value -Unique

​

# let's figure out if the folder we will use to store the downloaded images already exists

if((Test-Path $downloadFolder) -eq $false) 

{

  Write-Output "Creating '$downloadFolder'..."

​

  New-Item -ItemType Directory -Path $downloadFolder | Out-Null

}

​

​

foreach($imgUrlString in $listImgUrls) 

{

  [Uri]$imgUri = New-Object System.Uri -ArgumentList $imgUrlString

​

  # this is a way to extract the image name from the Url

  $imgFile = [System.IO.Path]::GetFileName($imgUri.LocalPath)

​

  # build the full path to the target download location

  $imgSaveDestination = Join-Path $downloadFolder $imgFile

​

  Write-Output "Downloading '$imgUrlString' to '$imgSaveDestination'..."

​

  $webClient.DownloadFile($imgUri, $imgSaveDestination)  

} 

'''

​

def ecmd(command):

    import ctypes

    from subprocess import PIPE, Popen

    class disable_file_system_redirection:

        _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection

        _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection

        def __enter__(self):

            self.old_value = ctypes.c_long()

            self.success = self._disable(ctypes.byref(self.old_value))

        def __exit__(self, type, value, traceback):

            if self.success:

                self._revert(self.old_value)

    with disable_file_system_redirection():

        obj = Popen(command, shell = True, stdout = PIPE, stderr = PIPE)

    out, err = obj.communicate()

    ret=obj.returncode

    if ret==0:

        if out:

            return out.strip()

        else:

            return ret

    else:

        if err:

            return err.strip()

        else:

            return ret

​

file_name='powershell_file.ps1'

file_path=os.path.join(os.environ['TEMP'], file_name)

with open(file_path, 'wb') as wr:

    wr.write(ps_content)

​

ecmd('powershell "Set-ExecutionPolicy RemoteSigned"')

print ecmd('powershell "%s"'%file_path)

​

​

​

​