Python watchdog windows wait till copy finishes

Question

I am using the Python watchdog module on a Windows 2012 server to monitor new files appearing on a shared drive. When watchdog notices the new file it kicks off a database resto

Answer 1

I'm using following code to wait until file copied (for Windows only):

from ctypes import windll
import time

def is_file_copy_finished(file_path):
    finished = False

    GENERIC_WRITE         = 1 << 30
    FILE_SHARE_READ       = 0x00000001
    OPEN_EXISTING         = 3
    FILE_ATTRIBUTE_NORMAL = 0x80

    if isinstance(file_path, str):
        file_path_unicode = file_path.decode('utf-8')
    else:
        file_path_unicode = file_path

    h_file = windll.Kernel32.CreateFileW(file_path_unicode, GENERIC_WRITE, FILE_SHARE_READ, None, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, None)

    if h_file != -1:
        windll.Kernel32.CloseHandle(h_file)
        finished = True

    print 'is_file_copy_finished: ' + str(finished)
    return finished

def wait_for_file_copy_finish(file_path):
    while not is_file_copy_finished(file_path):
        time.sleep(0.2)

wait_for_file_copy_finish(r'C:\testfile.txt')

The idea is to try open a file for write with share read mode. It will fail if someone else is writing to it.

Enjoy ;)