Capture screenshot by sending PrtSc key using PowerShell and grab it through HTTP with a Python CGI receiver

PrtSc_Screenshotter.ps1

# dependency
Add-Type -AssemblyName System.Windows.Forms

# send PrtSc key (= capture the screen to the clipboard)
[Windows.Forms.Sendkeys]::SendWait("{PrtSc}")

# save the image as PNG in memory
$png = New-Object System.IO.MemoryStream
[Windows.Forms.Clipboard]::GetImage().Save($png, [System.Drawing.Imaging.ImageFormat]::Png)

# clean up the clipboard
[Windows.Forms.Clipboard]::Clear()

# send the screenshot to the receiver in HTTP POST body
Invoke-WebRequest -Uri "http://192.168.56.1:8000/htbin/upload?test.png" -Method POST -Body $png.ToArray()

receiver.py

#!/usr/bin/env python3
#
# super simple CGI file receiver
#
# save this as htbin/upload, and run `python -m http.server --cgi`
#

import sys, os

# write raw POST body to the file specified by the query string
open(os.path.basename(os.environ.get('QUERY_STRING', 'screenshot.png')), 'wb').write(sys.stdin.buffer.read(int(os.environ.get('CONTENT_LENGTH', '0'))))

# minimal output to make Invoke-WebRequest happy
sys.stdout.write("\r\n")