NeeViewClient.py

# py -3.14 -m pip install psutil pywin32
# pyw -3.14 NeeViewClient.py path_to_neeview_exe path_to_image_file (...)

import sys, json, subprocess, psutil
import win32pipe, win32file, pywintypes
import ctypes
from ctypes import windll

def find_process_by_name(process_name):
  for proc in psutil.process_iter(['pid', 'name', 'exe']):
    if proc.info['name'] == process_name:
      return proc.info
  return None

Win32 = windll.user32
EnumWindowsProc = ctypes.WINFUNCTYPE(ctypes.c_int, ctypes.POINTER(ctypes.c_int), ctypes.POINTER(ctypes.c_int))

def activate_window_by_pid(pid):
  def activate_window(hwnd):
    target_pid = ctypes.c_ulong()
    Win32.GetWindowThreadProcessId(hwnd, ctypes.byref(target_pid))
    if pid == target_pid.value:
      if Win32.IsIconic(hwnd):
        Win32.ShowWindow(hwnd, 9) # SW_RESTORE == 9
      Win32.SetForegroundWindow(hwnd)
      Win32.BringWindowToTop(hwnd)
      return True
    else:
      return False
  def each_window(hwnd, _):
    if activate_window(hwnd):
      return 0
    return 1
  proc = EnumWindowsProc(each_window)
  Win32.EnumWindows(proc, 0)

def launch_neeview(neeview_exe, files):
    argv = [neeview_exe]
    argv.extend(files)
    process = subprocess.Popen(argv, creationflags= subprocess.DETACHED_PROCESS)
    # process = subprocess.Popen(argv, creationflags= subprocess.DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP)

def main():
  if len(sys.argv)<=2:
    return
  neeview_exe = sys.argv[1]
  files = sys.argv[2:]
  found_process = find_process_by_name("NeeView.exe")
  if found_process is None:
    launch_neeview(neeview_exe, files)
    return
  pid = found_process['pid']
  try:
    pipeName = f"\\\\.\\pipe\\NeeView.p{pid}"
    handle = win32file.CreateFile(pipeName, win32file.GENERIC_WRITE, 0, None, win32file.OPEN_EXISTING, 0, None)
    if handle == win32file.INVALID_HANDLE_VALUE:
      launch_neeview(neeview_exe, files)
      return

    filesjson = json.dumps(files)
    message = f'{{"Id":"LoadAs","Args":{filesjson}}}'
    win32file.WriteFile(handle, message.encode('utf-8'))
    win32file.CloseHandle(handle)

    activate_window_by_pid(pid)
  except pywintypes.error as e:
    Win32.MessageBoxW(None, f'Error: {e}', 'NeeViewClient.py', 0x00000030) # MB_ICONWARNING == 0x00000030L

if __name__ == '__main__':
  main()