[linux-minidisc] PythonNetMD and MacOS X

[Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi,

today I received an email from a user who had trouble using the NetMD
Python scripts on MacOS X. He received the following error message:

$ ./upload.py
Traceback (most recent call last):
  File "./upload.py", line 3, in <module>
    import usb1
  File "/Users/henningautzen/linux-minidisc/netmd/usb1.py", line 2, in
  <module>
    import libusb1
  File "/Users/henningautzen/linux-minidisc/netmd/libusb1.py", line
  54, in <module>
    libusb = cdll.LoadLibrary('libusb-1.0.so.0')
  File
  "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/ctypes/__init__.py",
  line 423, in LoadLibrary
    return self._dlltype(name)
  File
  "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/ctypes/__init__.py",
  line 345, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(libusb-1.0.so.0, 6): image not found
$

The problem is obvious, the script cannot find the shared libusb
library even though it has been installed. The library is located in a
different location when installed with Macports, namely:

/opt/local/lib/libusb-1.0.dylib

I created a temporary patch for the user to fix his problem (patch
attached). We need, however, a proper patch to fix that.


Adrian

--- libusb1.py	2010-02-11 23:12:27.000000000 +0100
+++ libusb1.py.new	2010-02-16 00:19:11.000000000 +0100
@@ -51,7 +51,7 @@
                 ('tv_usec', c_long)]
 timeval_p = POINTER(timeval)
 
-libusb = cdll.LoadLibrary('libusb-1.0.so.0')
+libusb = cdll.LoadLibrary('/opt/local/lib/libusb-1.0.dylib')
 
 # libusb.h
 def bswap16(x):