Cannot load on 64bit Windows XP due to "missing procedure"

[patricktokeeffe]

I use WinPython and with the latest 64bit release, 2.7.6.4 (python 2.7.6 amd64), an unhandled WindowsError prevents applications like Spyder and IPython QtConsole from loading. The previous major version winpython-64bit-2.7.5.3 (python 2.7.5 amd64) does not have this issue.

I had originally filed this with IPython because it occurs during the IPython load sequence. More specifically, though, it occurs when IPython tries to import zmq. I do see that ctypes is entered prior to the error occuring so I don't expect this to be solved solely within zmq.

A screenshot of the QtConsole error is attached. The following console output was obtained by adding "pause" to the end of /scripts/spyder.bat and /scripts/spyder_light.bat:

Traceback (most recent call last):
  File "spyder", line 3, in <module>
    start_app.main()
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\spyderlib\start_app.py", line 72, in main
    from spyderlib import spyder
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\spyderlib\spyder.py", line 118, in <module>
    from spyderlib.plugins.ipythonconsole import IPythonConsole
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\spyderlib\plugins\ipythonconsole.py", line 31, in <module>
    from IPython.lib.kernel import find_connection_file, get_connection_info
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\IPython\lib\kernel.py", line 11, in <module>
    from IPython.kernel.connect import *
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\IPython\kernel\__init__.py", line 4, in <module>
    from . import zmq
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\IPython\kernel\zmq\__init__.py", line 14, in <module>
    check_for_zmq('2.1.11', 'IPython.kernel.zmq')
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\IPython\utils\zmqrelated.py", line 35, in check_for_zmq
    import zmq
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\zmq\__init__.py", line 33, in <module>
    _libzmq = ctypes.cdll.LoadLibrary(bundled[0])
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
WindowsError: [Error 127] The specified procedure could not be found

[minrk]

Hi again, thanks for moving :)

How did you install pyzmq, and what version of pyzmq do you have? Do you get the same error with python -c 'import zmq'?

[patricktokeeffe]

Hi @minrk, I encountered this as part of a package: WinPython. It's one of those no-install distros which bundles Python with a bunch of goodies.

I'll have to check back on Monday regarding both questions (don't have a 64bit at home).

[patricktokeeffe]

OK, the WinPython Control Panel (one of the bundled apps) indicates I have pyzmq 14.0.1 and here is what the x64 machine says about python -c "import zmq":

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\zmq\__init__.py", line 33, in <module>
    _libzmq = ctypes.cdll.LoadLibrary(bundled[0])
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
WindowsError: [Error 127] The specified procedure could not be found

I see there is 14.3.1 out so I grabbed pyzmq‑14.3.1.win‑amd64‑py2.7.exe from Christoph Gohlke and installed it using the WinPython Control Panel. No real change in response to python -c "import zmq":

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\zmq\__init__.py", line 30, in <module>
    _libzmq = ctypes.cdll.LoadLibrary(bundled[0])
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\ctypes\__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
WindowsError: [Error 127] The specified procedure could not be found

For whatever reason, ctypes can't load libzmq.pyd. I thought about upgrading ctypes but (and this is odd) the included version is ahead of the "current release":

C:\WinPython-64bit-2.7.6.4\python-2.7.6.amd64>python -c "import ctypes; print ctypes.__version__"
1.1.0

Per the ctypes home page:

Recent releases can be downloaded in the sourceforge files section. The current version is 1.0.1.

[Kentzo]

We use pyzmq 14.3.0 installed via pip wheel on windows 7 and 8 (both x32 and x64) in pyqt app without any problems.

[patricktokeeffe]

Then it's probably safe to say this is isolated to WinXP x64. No surprise since x64 XP is the neglected bastard child of the windows family.

EDIT: Issue title edited to reflect this.

[cgohlke]

See #521 (comment)

[minrk]

@cgohlke thanks