scrapy.py

from struct import *
from ctypes import *
from win32con import *
from win32clipboard import *
from win32api import *
from ctypes import create_string_buffer as bytes

gdip = windll.gdiplus
kernel32 = windll.kernel32 
jpegFmtGuid = pack("IHHBBBBBBBB", 0xb96b3cae, 0x0728, 0x11d3, 0x9d,
                   0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e) 
token = c_uint32()

assert 0 == (
	gdip.GdiplusStartup(
		pointer(token), bytes(pack("I", 1), 32), bytes(32)))

try:
    pbmp = c_void_p()
    keybd_event(VK_SNAPSHOT, 0, 0, 0)
    keybd_event(VK_SNAPSHOT, 0, KEYEVENTF_KEYUP, 0)

    try:
        OpenClipboard()
        data = GetClipboardData(CF_DIB)
    finally:
        CloseClipboard()

    header, bmpdata = bytes(data[:52]), bytes(data[52:])

    assert 0 == (
		gdip.GdipCreateBitmapFromGdiDib(
			header, bmpdata, pointer(pbmp)))

    count, size = c_uint32(), c_uint32()
    gdip.GdipGetImageEncodersSize(pointer(count), pointer(size))
    encoders = bytes(size.value)
    gdip.GdipGetImageEncoders(count, size, encoders)
    i = encoders.raw.find(jpegFmtGuid)
    jpegEncoderClsid = encoders[i-16:i]

    assert 0 == (
		gdip.GdipSaveImageToFile(
			pbmp, c_wchar_p("c:/temp/screenshot.jpg"), 
			jpegEncoderClsid, 0))

finally:
    kernel32.LocalFree(pbmp)
    gdip.GdiplusShutdown(token)