Forums Technical Discussion Trying to use command line but getting a .dll error.

Trying to use command line but getting a .dll error.

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hou_person
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Joined: Aug. 2017
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I'm trying to access the hou module for command line (windows) Regular Python Shell (python 2.7) The sideFX doc [www.sidefx.com] But when I append my env variable ('C:\Program Files\Side Effects Software\Houdini 16.0.671\houdini\python2.7libs') and append it also to my sys path in the python shell I get a:

File "C:\Program Files\Side Effects Software\Houdini 16.0.671\houdini\python2.7libs\hou.py", line 19, in <module>
    import _hou
ImportError: DLL load failed: The specified module could not be found.

In my libs folder I don't have a ‘_hou.py’ I only have ‘_hou.pyd’

After trying to figure it out myself I am unable to get this working, anyone have a suggestion for me?
Edited by hou_person - Aug. 17, 2017 20:25:12
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hou_person
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15 posts
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Hey guys, hate to be that guy but only 30 people viewed it, and I am still lost.
One bump for good luck.
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NFX
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183 posts
Joined: Dec. 2011
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Having this issue with H16 on windows. Tried using the dlopen_flags from the documentation and still no luck. Anyone figure this out?
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George Rolfe
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Joined: March 2016
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I'm trying to do this as well in Houdini 17.5/Windows 10 and i'm getting the same error.

Here's a workaround which will find hython and re-run the script there:
import os, sys

def _locate_houdini():    
    import os
    from _winreg import ConnectRegistry, OpenKey, CloseKey, EnumKey, EnumValue, QueryValue, HKEY_LOCAL_MACHINE

    install_path = None
    abort = False
    while install_path is None and not abort:
        try:
            registry = ConnectRegistry(None, HKEY_LOCAL_MACHINE)
            key_path = 'SOFTWARE\\Side Effects Software\\'
            key = OpenKey(registry, key_path)
            i = 0
            while install_path is None:
                sub_key = EnumKey(key, i)
                i += 1
                if sub_key == 'Houdini' or sub_key == 'Houdini Engine':
                    sub_key = OpenKey(key, sub_key)
                    install_path = EnumValue(sub_key, 0)[1]
                    if not os.path.exists(install_path):
                        install_path = None
                    CloseKey(sub_key)
            CloseKey(key)
        except:
            pass

    return install_path

def _locate_hython():
    houdini_path = _locate_houdini()
    hython_path = houdini_path + 'bin\\hython2.7.exe'
    assert os.path.exists(hython_path), 'hython not found!'
    return hython_path

def _bootstrap(argv):
    import subprocess
    hython_path = _locate_hython()
    subprocess.call([hython_path, __file__] + argv)

# We're running in hython
def execute(argv):
    import hou
    print 'hello in hython'
    print argv

def main(argv):
    try:
        import hou
        execute(argv)
    except:
        _bootstrap(argv)

if __name__ == '__main__':
    main(sys.argv[1:])
Edited by George Rolfe - March 26, 2019 01:59:28
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dpotuznik
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Joined: April 2019
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George Rolfe
import os, sys

def _locate_houdini():
import os
from _winreg import ConnectRegistry, OpenKey, CloseKey, EnumKey, EnumValue, QueryValue, HKEY_LOCAL_MACHINE

install_path = None
abort = False
while install_path is None and not abort:
try:
registry = ConnectRegistry(None, HKEY_LOCAL_MACHINE)
key_path = 'SOFTWARE\\Side Effects Software\\'
key = OpenKey(registry, key_path)
i = 0
while install_path is None:
sub_key = EnumKey(key, i)
i += 1
if sub_key == 'Houdini' or sub_key == 'Houdini Engine':
sub_key = OpenKey(key, sub_key)
install_path = EnumValue(sub_key, 0)
if not os.path.exists(install_path):
install_path = None
CloseKey(sub_key)
CloseKey(key)
except:
pass

return install_path

def _locate_hython():
houdini_path = _locate_houdini()
hython_path = houdini_path + 'bin\\hython2.7.exe'
assert os.path.exists(hython_path), 'hython not found!'
return hython_path

def _bootstrap(argv):
import subprocess
hython_path = _locate_hython()
subprocess.call( + argv)

# We're running in hython
def execute(argv):
import hou
print 'hello in hython'
print argv

def main(argv):
try:
import hou
execute(argv)
except:
_bootstrap(argv)

if __name__ == '__main__':
main(sys.argv)

Thank you for that
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