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120 lines
4.5 KiB
120 lines
4.5 KiB
6 years ago
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"""Testing pasing object between multiple COM threads
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Uses standard COM marshalling to pass objects between threads. Even
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though Python generally seems to work when you just pass COM objects
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between threads, it shouldnt.
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This shows the "correct" way to do it.
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It shows that although we create new threads to use the Python.Interpreter,
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COM marshalls back all calls to that object to the main Python thread,
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which must be running a message loop (as this sample does).
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When this test is run in "free threaded" mode (at this stage, you must
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manually mark the COM objects as "ThreadingModel=Free", or run from a
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service which has marked itself as free-threaded), then no marshalling
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is done, and the Python.Interpreter object start doing the "expected" thing
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- ie, it reports being on the same thread as its caller!
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Python.exe needs a good way to mark itself as FreeThreaded - at the moment
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this is a pain in the but!
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"""
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import _thread, traceback
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import win32com.client
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import win32event, win32api
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import pythoncom
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def TestInterp(interp):
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if interp.Eval("1+1") != 2:
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raise ValueError("The interpreter returned the wrong result.")
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try:
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interp.Eval(1+1)
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raise ValueError("The interpreter did not raise an exception")
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except pythoncom.com_error as details:
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import winerror
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if details[0]!=winerror.DISP_E_TYPEMISMATCH:
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raise ValueError("The interpreter exception was not winerror.DISP_E_TYPEMISMATCH.")
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def TestInterpInThread(stopEvent, cookie):
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try:
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DoTestInterpInThread(cookie)
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finally:
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win32event.SetEvent(stopEvent)
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def CreateGIT():
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return pythoncom.CoCreateInstance(pythoncom.CLSID_StdGlobalInterfaceTable,
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None,
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pythoncom.CLSCTX_INPROC,
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pythoncom.IID_IGlobalInterfaceTable)
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def DoTestInterpInThread(cookie):
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try:
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pythoncom.CoInitialize()
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myThread = win32api.GetCurrentThreadId()
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GIT = CreateGIT()
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interp = GIT.GetInterfaceFromGlobal(cookie, pythoncom.IID_IDispatch)
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interp = win32com.client.Dispatch(interp)
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TestInterp(interp)
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interp.Exec("import win32api")
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print("The test thread id is %d, Python.Interpreter's thread ID is %d" % (myThread, interp.Eval("win32api.GetCurrentThreadId()")))
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interp = None
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pythoncom.CoUninitialize()
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except:
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traceback.print_exc()
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def BeginThreadsSimpleMarshal(numThreads, cookie):
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"""Creates multiple threads using simple (but slower) marshalling.
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Single interpreter object, but a new stream is created per thread.
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Returns the handles the threads will set when complete.
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"""
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ret = []
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for i in range(numThreads):
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hEvent = win32event.CreateEvent(None, 0, 0, None)
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_thread.start_new(TestInterpInThread, (hEvent, cookie))
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ret.append(hEvent)
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return ret
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def test(fn):
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print("The main thread is %d" % (win32api.GetCurrentThreadId()))
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GIT = CreateGIT()
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interp = win32com.client.Dispatch("Python.Interpreter")
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cookie = GIT.RegisterInterfaceInGlobal(interp._oleobj_, pythoncom.IID_IDispatch)
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events = fn(4, cookie)
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numFinished = 0
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while 1:
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try:
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rc = win32event.MsgWaitForMultipleObjects(events, 0, 2000, win32event.QS_ALLINPUT)
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if rc >= win32event.WAIT_OBJECT_0 and rc < win32event.WAIT_OBJECT_0+len(events):
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numFinished = numFinished + 1
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if numFinished >= len(events):
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break
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elif rc==win32event.WAIT_OBJECT_0 + len(events): # a message
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# This is critical - whole apartment model demo will hang.
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pythoncom.PumpWaitingMessages()
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else: # Timeout
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print("Waiting for thread to stop with interfaces=%d, gateways=%d" % (pythoncom._GetInterfaceCount(), pythoncom._GetGatewayCount()))
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except KeyboardInterrupt:
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break
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GIT.RevokeInterfaceFromGlobal(cookie)
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del interp
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del GIT
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if __name__=='__main__':
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test(BeginThreadsSimpleMarshal)
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win32api.Sleep(500)
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# Doing CoUninit here stop Pythoncom.dll hanging when DLLMain shuts-down the process
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pythoncom.CoUninitialize()
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if pythoncom._GetInterfaceCount()!=0 or pythoncom._GetGatewayCount()!=0:
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print("Done with interfaces=%d, gateways=%d" % (pythoncom._GetInterfaceCount(), pythoncom._GetGatewayCount()))
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else:
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print("Done.")
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