On Wed, 19 Mar 2008, Bill Janssen wrote:
It's not sys.path (that's where PYTHONPATH ends up), it's the env's PATH or,
more precisely, the process's executable search path that needs to be
updated. I don't know of a linker way to do this on Windows. Once the
process has started, my understanding is that it's too late already.
Right. On Windows, though, this works:
I haven't tried this but it seems to be missing stuff on the Path.
I see you're adding %javahome%/bin/client to Path but what about
%javahome%/bin ? It contains some other needed library. Maybe jvm.dll knows
how to find the rest ? Maybe there is no 'rest' to find ?
If I were to include this into JCC, I'd probably rewrite it in C++ so as to
not depend on the optional winreg module and add a simple call to this in
__init__.py instead. Also, this trick has to be made optional to not be in
the way of more exotic setups such as people with multiple installs of
various JREs, etc, etc...
I guess, I should rewrite this to attempt loading jvm.dll and only play the
Path trick if that call fails. Ok, food for thought :)
Andi..
Index: jcc/jcc/__init__.py
===================================================================
--- jcc/jcc/__init__.py (revision 405)
+++ jcc/jcc/__init__.py (working copy)
@@ -22,8 +22,24 @@
# jcc package
+import sys
+if sys.platform == 'win32':
+
+ # figure out where the jvm.dll is, and make sure that location is on PATH
+ import _winreg as wreg
+ registry = wreg.ConnectRegistry(None, wreg.HKEY_LOCAL_MACHINE)
+ key = wreg.OpenKey(registry, r"SOFTWARE\JavaSoft\Java Runtime Environment")
+ v, t = wreg.QueryValueEx(key, "CurrentVersion")
+ key = wreg.OpenKey(registry, r"SOFTWARE\JavaSoft\Java Runtime
Environment\%s" % v)
+ javahome, t = wreg.QueryValueEx(key, "JavaHome")
+ registry.Close()
+ # if we have a javahome, make sure it's on the PATH
+ if javahome:
+ import os
+ location = os.path.join(javahome, "bin", "client")
+ os.environ['Path'] = ';'.join(os.environ['Path'].split(';') +
[location,])
+
if __name__ == '__main__':
- import sys
from jcc import cpp
cpp.jcc(sys.argv)
else:
The downside is that you have to add this kind of little startup blit
to each JCC-wrapped module. So, this either needs to be turned into
a JCC utility function which gets called once per Python instantiation,
or generated by the wrapper generation process for each module.
Bill
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