def serialReadEvent(self):
#get that character we set up
n = win32file.GetOverlappedResult(self._serial.hComPort,
self._overlappedRead, 0)
if n:
first = str(self.read_buf[:n])
#now we should get everything that is already in the buffer
flags, comstat = win32file.ClearCommError(self._serial.hComPort)
if comstat.cbInQue:
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, buf = win32file.ReadFile(
self._serial.hComPort,
win32file.AllocateReadBuffer(comstat.cbInQue),
self._overlappedRead)
n = win32file.GetOverlappedResult(self._serial.hComPort,
self._overlappedRead, 1)
#handle all the received data:
self.protocol.dataReceived(first + str(buf[:n]))
else:
#handle all the received data:
self.protocol.dataReceived(first)
#set up next one
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, self.read_buf = win32file.ReadFile(self._serial.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
def test_connect_without_payload(self):
giveup_event = win32event.CreateEvent(None, 0, 0, None)
t = threading.Thread(target=self.connect_thread_runner,
args=(False, giveup_event))
t.start()
time.sleep(0.1)
s2 = socket.socket()
ol = pywintypes.OVERLAPPED()
s2.bind(('0.0.0.0', 0)) # connectex requires the socket be bound beforehand
try:
win32file.ConnectEx(s2, self.addr, ol)
except win32file.error as exc:
win32event.SetEvent(giveup_event)
if exc.winerror == 10022: # WSAEINVAL
raise TestSkipped("ConnectEx is not available on this platform")
raise # some error error we don't expect.
win32file.GetOverlappedResult(s2.fileno(), ol, 1)
ol = pywintypes.OVERLAPPED()
buff = win32file.AllocateReadBuffer(1024)
win32file.WSARecv(s2, buff, ol, 0)
length = win32file.GetOverlappedResult(s2.fileno(), ol, 1)
self.response = buff[:length]
self.assertEqual(self.response, str2bytes('some expected response'))
t.join(5)
self.failIf(t.isAlive(), "worker thread didn't terminate")
def readuntil(self, char):
"read bytes from serial port until char is hit"
if not self.hComPort: raise portNotOpenError
print thetime(), "readuntil entered"
overlapped = win32file.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 1, 0, None)
dcb = win32file.GetCommState(self.hComPort)
oldevt = dcb.EvtChar
dcb.EvtChar = char
rc = win32file.SetCommState(self.hComPort, dcb)
print thetime(), "setcommstate returned", rc
oldmask = win32file.GetCommMask(self.hComPort)
rc = win32file.SetCommMask(self.hComPort, win32file.EV_RXFLAG)
print thetime(), "setcommmask returned", rc
rc, mask = win32file.WaitCommEvent(self.hComPort, overlapped)
print thetime(), "waitcommevent returned", rc, mask
rc = win32event.WaitForSingleObject(overlapped.hEvent, 10000)
print thetime(), "waitforsingleobject returned", rc
n = win32file.GetOverlappedResult(self.hComPort, overlapped, 0)
print thetime(), "getoverlappedresult returned", n
win32file.SetCommMask(self.hComPort, oldmask)
flags, comstat = win32file.ClearCommError(self.hComPort)
print thetime(), "clearcommerror", flags, comstat.cbInQue
rc, buf = win32file.ReadFile(
self.hComPort, win32file.AllocateReadBuffer(comstat.cbInQue),
overlapped)
print thetime(), "readfile retrurned", rc
n = win32file.GetOverlappedResult(self.hComPort, overlapped, 1)
print thetime(), "getoverlappedresult returned", n
read = str(buf[:n])
return read
def run(self):
continueloop = True
n = 1
waitingOnRead = False
buf = win32file.AllocateReadBuffer(n)
while continueloop:
if self.EVENT.isSet():
win32event.SetEvent(self.stopevent)
if not waitingOnRead:
win32event.ResetEvent(self.serial._overlappedRead.hEvent)
hr, _ = win32file.ReadFile(self.serial.hComPort, buf, self.serial._overlappedRead)
if hr == 997: waitingOnRead = True
elif hr == 0: pass
else: raise
rc = win32event.MsgWaitForMultipleObjects((self.serial._overlappedRead.hEvent, self.stopevent),
0, 1000, win32event.QS_ALLINPUT)
if rc == win32event.WAIT_OBJECT_0:
n = win32file.GetOverlappedResult(self.serial.hComPort, self.serial._overlappedRead, 1)
if n and not self.EVENT.isSet(): self.plugin.Decode(ord(buf[0]))
waitingOnRead = False
elif rc == win32event.WAIT_OBJECT_0+1: continueloop = False
elif rc == win32event.WAIT_TIMEOUT: pass
else: pass
self.serial.close()
def data(self):
ur"""Wait until the IO has completed and return the data from the read. This
is expected to be called after is_complete is true.
"""
n_bytes = win32file.GetOverlappedResult(self.handle, self.overlapped,
True)
return str(self.buffer)[:n_bytes]
def _watcherThreadOverlapped(self, dn, dh, changes):
flags = win32con.FILE_NOTIFY_CHANGE_FILE_NAME
buf = win32file.AllocateReadBuffer(8192)
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
while 1:
win32file.ReadDirectoryChangesW(
dh,
buf,
False, #sub-tree
flags,
overlapped)
# Wait for our event, or for 5 seconds.
rc = win32event.WaitForSingleObject(overlapped.hEvent, 5000)
if rc == win32event.WAIT_OBJECT_0:
# got some data! Must use GetOverlappedResult to find out
# how much is valid! 0 generally means the handle has
# been closed. Blocking is OK here, as the event has
# already been set.
nbytes = win32file.GetOverlappedResult(dh, overlapped, True)
if nbytes:
bits = win32file.FILE_NOTIFY_INFORMATION(buf, nbytes)
changes.extend(bits)
else:
# This is "normal" exit - our 'tearDown' closes the
# handle.
# print "looks like dir handle was closed!"
return
else:
print("ERROR: Watcher thread timed-out!")
return # kill the thread!
def receivebyte(self, RDtimeout=0):
"""read num bytes from serial port"""
if not self.hComPort: raise portNotOpenError
timeouts = (win32con.MAXDWORD, win32con.MAXDWORD, int(RDtimeout * 100),
0, 0) # timeouts in 100 ms units...
win32file.SetCommTimeouts(self.hComPort, timeouts)
win32event.ResetEvent(self._overlappedRead.hEvent)
flags, comstat = win32file.ClearCommError(self.hComPort)
n = comstat.cbInQue
if n > 0: # there is data in buffer
rc, buf = win32file.ReadFile(self.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
win32event.WaitForSingleObject(self._overlappedRead.hEvent,
win32event.INFINITE)
read = buf[0]
else:
rc, buf = win32file.ReadFile(self.hComPort,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
n = win32file.GetOverlappedResult(self.hComPort,
self._overlappedRead, 1)
if n > 0:
read = buf[0]
else:
read = -1
return read
def testTransactNamedPipeAsync(self):
event = threading.Event()
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
self.startPipeServer(event, 0.5)
open_mode = win32con.GENERIC_READ | win32con.GENERIC_WRITE
hpipe = win32file.CreateFile(
self.pipename,
open_mode,
0, # no sharing
None, # default security
win32con.OPEN_EXISTING,
win32con.FILE_FLAG_OVERLAPPED,
None,
)
# set to message mode.
win32pipe.SetNamedPipeHandleState(
hpipe, win32pipe.PIPE_READMODE_MESSAGE, None, None
)
buffer = win32file.AllocateReadBuffer(1024)
hr, got = win32pipe.TransactNamedPipe(
hpipe, str2bytes("foo\0bar"), buffer, overlapped
)
self.assertEqual(hr, winerror.ERROR_IO_PENDING)
nbytes = win32file.GetOverlappedResult(hpipe, overlapped, True)
got = buffer[:nbytes]
self.assertEqual(got, str2bytes("bar\0foo"))
event.wait(5)
self.assertTrue(event.isSet(), "Pipe server thread didn't terminate")
def Write(self, data, timeout):
if self.handle:
try:
self.lockObject.acquire()
if eg.debugLevel:
print("writing " + str(len(data)) + " bytes to " +
self.getName())
if not self._overlappedWrite:
self._overlappedWrite = win32file.OVERLAPPED()
err, n = win32file.WriteFile(self.handle, data,
self._overlappedWrite)
if err: #will be ERROR_IO_PENDING:
# Wait for the write to complete.
n = win32file.GetOverlappedResult(self.handle,
self._overlappedWrite, 1)
if n != len(data):
raise Exception("could not write full data")
elif n != len(data):
raise Exception("could not write full data")
if timeout: #waits for response from device
win32event.ResetEvent(self._overlappedRead.hEvent)
res = win32event.WaitForSingleObject(
self._overlappedRead.hEvent, timeout)
if res == win32event.WAIT_TIMEOUT:
raise Exception(
"no response from device within timeout")
finally:
self.lockObject.release()
else:
raise Exception("invalid handle")
def acceptWorker(self, port, running_event, stopped_event):
listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listener.bind(('', port))
listener.listen(200)
# create accept socket
accepter = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# An overlapped
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
# accept the connection.
# We used to allow strings etc to be passed here, and they would be
# modified! Obviously this is evil :)
buffer = " " * 1024 # EVIL - SHOULD NOT BE ALLOWED.
self.assertRaises(TypeError, win32file.AcceptEx, listener, accepter,
buffer, overlapped)
# This is the correct way to allocate the buffer...
buffer = win32file.AllocateReadBuffer(1024)
rc = win32file.AcceptEx(listener, accepter, buffer, overlapped)
self.failUnlessEqual(rc, winerror.ERROR_IO_PENDING)
# Set the event to say we are all ready
running_event.set()
# and wait for the connection.
rc = win32event.WaitForSingleObject(overlapped.hEvent, 2000)
if rc == win32event.WAIT_TIMEOUT:
self.fail("timed out waiting for a connection")
nbytes = win32file.GetOverlappedResult(listener.fileno(), overlapped,
False)
#fam, loc, rem = win32file.GetAcceptExSockaddrs(accepter, buffer)
accepter.send(buffer[:nbytes])
# NOT set in a finally - this means *successfully* stopped!
stopped_event.set()
def read(self, size=1):
"""Read size bytes from the serial port. If a timeout is set it may
return less characters as requested. With no timeout it will block
until the requested number of bytes is read."""
if not self.hComPort: raise portNotOpenError
if size > 0:
win32event.ResetEvent(self._overlappedRead.hEvent)
flags, comstat = win32file.ClearCommError(self.hComPort)
if self.timeout == 0:
n = min(comstat.cbInQue, size)
if n > 0:
rc, buf = win32file.ReadFile(
self.hComPort, win32file.AllocateReadBuffer(n),
self._overlappedRead)
win32event.WaitForSingleObject(self._overlappedRead.hEvent,
win32event.INFINITE)
read = str(buf)
else:
read = ''
else:
rc, buf = win32file.ReadFile(
self.hComPort, win32file.AllocateReadBuffer(size),
self._overlappedRead)
n = win32file.GetOverlappedResult(self.hComPort,
self._overlappedRead, 1)
read = str(buf[:n])
else:
read = ''
return read
def _loop_asynchronous(self, callback):
buf = win32file.AllocateReadBuffer(8192)
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
while not self._stopped:
win32file.ReadDirectoryChangesW(self._hdir, buf, self._recurse,
self._filter, overlapped)
##
## This will block until notification OR timeout.
##
rc = win32event.WaitForSingleObject(overlapped.hEvent,
self._timeout)
if rc == win32event.WAIT_OBJECT_0:
## got event: determine data length ..
n = win32file.GetOverlappedResult(self._hdir, overlapped, True)
if n:
## retrieve data
results = win32file.FILE_NOTIFY_INFORMATION(buf, n)
r = [(DirWatcher._ACTIONS.get(x[0], "UNKNOWN"), x[1])
for x in results]
if len(r) > 0:
callback(r)
else:
# directory handled was closed
self._stopped = True
else:
## timeout
pass
def write(self, s):
try:
win32file.WriteFile(self._hfile, s, self._write_ovrlpd)
return win32file.GetOverlappedResult(self._hfile,
self._write_ovrlpd, True)
except:
return 0
def testAcceptEx(self):
port = 4680
running = threading.Event()
stopped = threading.Event()
t = threading.Thread(target=self.acceptWorker,
args=(port, running, stopped))
t.start()
running.wait(2)
if not running.isSet():
self.fail("AcceptEx Worker thread failed to start")
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('127.0.0.1', port))
win32file.WSASend(s, str2bytes("hello"), None)
overlapped = pywintypes.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
# Like above - WSARecv used to allow strings as the receive buffer!!
buffer = " " * 10
self.assertRaises(TypeError, win32file.WSARecv, s, buffer, overlapped)
# This one should work :)
buffer = win32file.AllocateReadBuffer(10)
win32file.WSARecv(s, buffer, overlapped)
nbytes = win32file.GetOverlappedResult(s.fileno(), overlapped, True)
got = buffer[:nbytes]
self.failUnlessEqual(got, str2bytes("hello"))
# thread should have stopped
stopped.wait(2)
if not stopped.isSet():
self.fail("AcceptEx Worker thread failed to successfully stop")
def read(self, size=1):
"read num bytes from serial port"
if not self.hComPort: raise portNotOpenError
read = ''
if size > 0:
overlapped = win32file.OVERLAPPED()
overlapped.hEvent = win32event.CreateEvent(None, 1, 0, None)
if self.timeout == 0:
flags, comstat = win32file.ClearCommError(self.hComPort)
n = min(comstat.cbInQue, size)
if n > 0:
rc, buf = win32file.ReadFile(
self.hComPort, win32file.AllocateReadBuffer(n),
overlapped)
win32event.WaitForSingleObject(overlapped.hEvent,
win32event.INFINITE)
read = str(buf)
else:
flags, comstat = win32file.ClearCommError(self.hComPort)
rc, buf = win32file.ReadFile(
self.hComPort, win32file.AllocateReadBuffer(size),
overlapped)
n = win32file.GetOverlappedResult(self.hComPort, overlapped, 1)
read = str(buf[:n])
return read
def _read_watch(self, watch):
if win32event.WaitForSingleObject(watch.event, 0) \
== win32event.WAIT_TIMEOUT:
nbytes = 0
else:
nbytes = win32file.GetOverlappedResult(watch.handle,
watch.overlapped, False)
return win32file.FILE_NOTIFY_INFORMATION(watch.buffer, nbytes)
def read(self, timeout=0, buf_sz=0):
if self.transport == Pipe.Transport.ASYNCHRONOUS:
if timeout is None:
evTimeout = 50 # 50ms is the default value per MSDN docs.
elif int(timeout) == 0:
evTimeout = 50 # 50ms is the default value per MSDN docs.
else:
evTimeout = int(timeout)
stream = self._getOverlappedStruct()
if buf_sz <= 0:
buf_sz = 2048
ov_buf = w32f.AllocateReadBuffer(buf_sz)
pipe_data = ''
while True:
try:
pipe_status, pipe_buffer = w32f.ReadFile(
self.__hPipe, ov_buf, stream
)
except WinT.error, e:
if e.args[0] == werr.ERROR_BROKEN_PIPE:
return 1, stream.Offset, pipe_data
else:
raise
if pipe_status == 0 or \
pipe_status == werr.ERROR_IO_PENDING:
#TODO: Return stream and then prompt user to fetch data.
if pipe_status == werr.ERROR_IO_PENDING:
self.__waitForEvent(stream, evTimeout)
try:
read_bytes = w32f.GetOverlappedResult(
self.__hPipe, stream, False
)
except WinT.error, e:
if e.args[0] == werr.ERROR_MORE_DATA:
ov_buf = self.__expandBufferPipe(buf_sz)
stream.Offset += len(pipe_buffer)
pipe_data += pipe_buffer
continue
elif e.args[0] == werr.ERROR_BROKEN_PIPE:
return 1, stream.Offset, pipe_data
else:
raise
elif pipe_status == werr.ERROR_MORE_DATA:
ov_buf = self.__expandBufferPipe(buf_sz)
stream.Offset += len(pipe_buffer)
pipe_data += pipe_buffer
continue
else:
raise PipeError(
'Pipe encountered a fatal error!',
'error_code',
w32api.GetLastError()
)
stream.Offset += read_bytes
pipe_data += pipe_buffer[:read_bytes]
if read_bytes < len(pipe_buffer):
return 0, stream.Offset, pipe_data
def read(self):
if win32event.WaitForSingleObject(self.event, 0) \
== win32event.WAIT_TIMEOUT:
result = []
else:
nbytes = win32file.GetOverlappedResult(self.handle,
self.overlapped, False)
result = win32file.FILE_NOTIFY_INFORMATION(self.buffer, nbytes)
self._start()
return result
def pipeRead(self):
"""
Read some data
"""
n = win32file.GetOverlappedResult(self._handle, self._olapped_io, 0)
data = self._read_buffer[:n]
self.dataReceived(data)
win32event.ResetEvent(self._olapped_io.hEvent)
win32file.ReadFile(self._handle, self._read_buffer, self._olapped_io)
def write(self, s):
try:
win32file.WriteFile(self._hfile, s, self._write_ovrlpd)
return win32file.GetOverlappedResult(self._hfile,
self._write_ovrlpd, True)
except:
logging.debug("Exception writing to VirtIO", exc_info=True)
# We do sleep here to avoid constant writes to spike the CPU
time.sleep(1)
return 0
def read(self, n):
(nr, buf) = (0, ())
try:
(hr, buf) = win32file.ReadFile(self._hfile,
win32file.AllocateReadBuffer(n),
self._read_ovrlpd)
nr = win32file.GetOverlappedResult(self._hfile, self._read_ovrlpd,
True)
except:
pass
return buf[:nr]
def read(self, n):
(nr, buf) = (0, ())
try:
(hr, buf) = win32file.ReadFile(self._hfile,
win32file.AllocateReadBuffer(n),
self._read_ovrlpd)
nr = win32file.GetOverlappedResult(self._hfile, self._read_ovrlpd,
True)
except:
logging.debug("Exception on reading from VirtIO", exc_info=True)
# We do sleep here to avoid constant reads spike the CPU
time.sleep(1)
return buf[:nr]
def write(self, data):
self.write_lock.acquire()
writelen = 0
try:
win32event.ResetEvent(self.write_overlapped.hEvent)
err, writelen = win32file.WriteFile(self.handle, data,
self.write_overlapped)
if err == 997:
writelen = win32file.GetOverlappedResult(
self.handle, self.write_overlapped, True)
finally:
self.write_lock.release()
return writelen
def run(self):
hDir = win32file.CreateFileW(
self._watch_path,
FILE_LIST_DIRECTORY,
win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE,
None,
win32con.OPEN_EXISTING,
win32con.FILE_FLAG_BACKUP_SEMANTICS |
win32con.FILE_FLAG_OVERLAPPED,
None
)
while self._windows_sucks_flag:
buf = win32file.AllocateReadBuffer(1024)
win32file.ReadDirectoryChangesW(
hDir,
buf,
True,
win32con.FILE_NOTIFY_CHANGE_FILE_NAME |
win32con.FILE_NOTIFY_CHANGE_DIR_NAME |
win32con.FILE_NOTIFY_CHANGE_SIZE |
win32con.FILE_NOTIFY_CHANGE_LAST_WRITE,
self._overlapped
)
result_stack = {}
rc = win32event.WaitForMultipleObjects((self._wait_stop,
self._overlapped.hEvent),
0, win32event.INFINITE)
if rc == win32event.WAIT_OBJECT_0:
# Stop event
break
data = win32file.GetOverlappedResult(hDir, self._overlapped, True)
# lets read the data and store it in the results
results = win32file.FILE_NOTIFY_INFORMATION(buf, data)
for action, afile in results:
if action in ACTIONS:
full_filename = os.path.join(self._watch_path, afile)
result_stack.setdefault(full_filename,
[]).append(ACTIONS.get(action))
keys = list(result_stack.keys())
while len(keys):
key = keys.pop(0)
event = result_stack.pop(key)
if (ADDED in event) and (DELETED in event):
event = [e for e in event if e not in (ADDED, DELETED)]
noticed = []
for each_event in event:
if each_event not in noticed:
self._callback(each_event, full_filename)
noticed.append(each_event)
def write(self, s):
"""Output the given string over the serial port."""
if not self.hComPort: raise portNotOpenError
if s:
#~ win32event.ResetEvent(self._overlappedWrite.hEvent)
err, n = win32file.WriteFile(self.hComPort, s,
self._overlappedWrite)
if err: #will be ERROR_IO_PENDING:
# Wait for the write to complete.
#~ win32event.WaitForSingleObject(self._overlappedWrite.hEvent, win32event.INFINITE)
n = win32file.GetOverlappedResult(self.hComPort,
self._overlappedWrite, 1)
if n != len(s):
raise writeTimeoutError
def test_connect_with_payload(self):
giveup_event = win32event.CreateEvent(None, 0, 0, None)
t = threading.Thread(target=self.connect_thread_runner,
args=(True, giveup_event))
t.start()
time.sleep(0.1)
s2 = socket.socket()
ol = pywintypes.OVERLAPPED()
s2.bind(("0.0.0.0",
0)) # connectex requires the socket be bound beforehand
try:
win32file.ConnectEx(s2, self.addr, ol,
str2bytes("some expected request"))
except win32file.error as exc:
win32event.SetEvent(giveup_event)
if exc.winerror == 10022: # WSAEINVAL
raise TestSkipped(
"ConnectEx is not available on this platform")
raise # some error error we don't expect.
# We occasionally see ERROR_CONNECTION_REFUSED in automation
try:
win32file.GetOverlappedResult(s2.fileno(), ol, 1)
except win32file.error as exc:
win32event.SetEvent(giveup_event)
if exc.winerror == winerror.ERROR_CONNECTION_REFUSED:
raise TestSkipped(
"Assuming ERROR_CONNECTION_REFUSED is transient")
raise
ol = pywintypes.OVERLAPPED()
buff = win32file.AllocateReadBuffer(1024)
win32file.WSARecv(s2, buff, ol, 0)
length = win32file.GetOverlappedResult(s2.fileno(), ol, 1)
self.response = buff[:length]
self.assertEqual(self.response, str2bytes("some expected response"))
self.assertEqual(self.request, str2bytes("some expected request"))
t.join(5)
self.failIf(t.is_alive(), "worker thread didn't terminate")
def write(self, data):
"""Output the given string over the serial port."""
if not self.hComPort: raise portNotOpenError
if not isinstance(data, str):
raise TypeError('expected str, got %s' % type(data))
#print repr(s),
if data:
#~ win32event.ResetEvent(self._overlappedWrite.hEvent)
err, n = win32file.WriteFile(self.hComPort, data, self._overlappedWrite)
if err: #will be ERROR_IO_PENDING:
# Wait for the write to complete.
#~ win32event.WaitForSingleObject(self._overlappedWrite.hEvent, win32event.INFINITE)
n = win32file.GetOverlappedResult(self.hComPort, self._overlappedWrite, 1)
if n != len(data):
raise writeTimeoutError
def mRead(self, iLen):
oOl = pywintypes.OVERLAPPED()
oOl.hEvent = win32event.CreateEvent(None, 1, 0, None)
if not oOl.hEvent:
print('Could not create overlapped handle')
raise CommException
iEr, sData = win32file.ReadFile(self._oFd, iLen, oOl)
if iEr == winerror.ERROR_IO_PENDING:
try:
iNumRd = win32file.GetOverlappedResult(self._oFd, oOl, 1)
except win32api.error:
print('...wait error')
raise CommException
oOl.hEvent.Close()
return sData
def read(self):
self.read_lock.acquire()
result = None
try:
win32event.ResetEvent(self.read_overlapped.hEvent)
err, data = win32file.ReadFile(self.handle, self.buffer,
self.read_overlapped)
if err == 997: #ERROR_IO_PENDING
n = win32file.GetOverlappedResult(self.handle,
self.read_overlapped, True)
result = bytes(data[:n])
else:
result = bytes(data)
finally:
self.read_lock.release()
return result
def mWrite(self, sData):
oOl = pywintypes.OVERLAPPED()
oOl.hEvent = win32event.CreateEvent(None, 1, 0, None)
if not oOl.hEvent:
print('could not create overlapped handle')
return 0
iEr, iNumWr = win32file.WriteFile(self._oFd, sData, oOl)
if iNumWr == 0:
if iEr == winerror.ERROR_IO_PENDING:
try:
iNumWr = win32file.GetOverlappedResult(
self._oFd, oOl, 1)
except win32api.error:
raise CommException
oOl.hEvent.Close()
return iNumWr
