import ctypes
from ctypes import wintypes

rstrtmgr = ctypes.windll.rstrtmgr

class RM_UNIQUE_PROCESS(ctypes.Structure):
    _fields_ = [("dwProcessId", wintypes.DWORD),
                ("ProcessStartTime", wintypes.FILETIME)]

class RM_PROCESS_INFO(ctypes.Structure):
    _fields_ = [("Process", RM_UNIQUE_PROCESS),
                ("strAppName", ctypes.c_wchar * 255),
                ("strServiceShortName", ctypes.c_wchar * 63),
                ("ApplicationType", ctypes.c_int),
                ("AppStatus", ctypes.c_uint),
                ("TSSessionId", wintypes.DWORD),
                ("bRestartable", wintypes.BOOL)]

RmStartSession = rstrtmgr.RmStartSession
RmStartSession.argtypes = [ctypes.POINTER(ctypes.c_uint32), ctypes.c_uint32, ctypes.c_wchar_p]
RmStartSession.restype = ctypes.c_uint32

RmRegisterResources = rstrtmgr.RmRegisterResources
RmRegisterResources.argtypes = [ctypes.c_uint32, ctypes.c_uint32, ctypes.c_wchar_p,
                                ctypes.c_uint32, ctypes.POINTER(ctypes.c_void_p),
                                ctypes.c_uint32, ctypes.c_wchar_p]
RmRegisterResources.restype = ctypes.c_uint32

RmGetList = rstrtmgr.RmGetList
RmGetList.argtypes = [ctypes.c_uint32, ctypes.POINTER(ctypes.c_uint32), ctypes.POINTER(ctypes.c_uint32),
                      ctypes.POINTER(RM_PROCESS_INFO), ctypes.POINTER(ctypes.c_uint32)]
RmGetList.restype = ctypes.c_uint32

RmEndSession = rstrtmgr.RmEndSession
RmEndSession.argtypes = [ctypes.c_uint32]
RmEndSession.restype = ctypes.c_uint32

session = ctypes.c_uint32(0)
desc = ctypes.create_unicode_buffer("diag")
rc = RmStartSession(ctypes.byref(session), 0, desc)
if rc != 0:
    print("RmStartSession failed", rc)
    raise SystemExit

path = ctypes.create_unicode_buffer(r"C:\ub-build\userbase\classes\application.yml")
rc = RmRegisterResources(session, 1, path, 0, None, 0, None)
print("RmRegisterResources rc=", rc)

nNeeded = ctypes.c_uint32(0)
nActual = ctypes.c_uint32(0)
reason = ctypes.c_uint32(0)
rc = RmGetList(session, ctypes.byref(nNeeded), ctypes.byref(nActual), None, ctypes.byref(reason))
print("first RmGetList rc=", rc, "needed=", nNeeded.value)
if nNeeded.value > 0:
    arr = (RM_PROCESS_INFO * nNeeded.value)()
    nActual = ctypes.c_uint32(nNeeded.value)
    rc = RmGetList(session, ctypes.byref(nNeeded), ctypes.byref(nActual), arr, ctypes.byref(reason))
    print("second RmGetList rc=", rc, "actual=", nActual.value)
    for i in range(nActual.value):
        p = arr[i]
        print("HOLDER PID=", p.Process.dwProcessId, "app=", p.strAppName)
else:
    print("NO PROCESS HOLDER (likely ACL/permission, not a lock)")
RmEndSession(session)