After using win32com for years, I stumbled across comtypes earlier
tonight. My tests indicate that comtypes is significantly faster than
win32com for reading/writing large arrays of data between Python and
the COM object. So far, all of the methods on the COM object work
nicely with comtypes except for one called WriteTagV. The signature
of this method is:
long WriteTagV(LPCTSTR Name, long nOS, Variant &buffer);
When I attempt to execute the following code:
from comtypes import client
from numpy import array
interface = client.CreateObject('RPco.X')
data = array([1, 2, 3, 4, 5], dtype='f4')
interface.WriteTagV('data', 0, data)
I get the following error:
TypeError: Cannot put array([ 1., 2., 3., 4., 5.], dtype=float32) in VARIANT
Traceback is below my signature.
However, when I try the following
from array import array
data = array('d', [1, 2, 3, 4, 5])
interface.WriteTagV('data', 0, data)
It works just fine!
Is there something I need to do to get this working with Numpy ndarray
objects? This method worked just fine with win32com and Numpy arrays.
Thanks!
Brad
Full traceback for the Numpy array case:
c:\experiments\programs\python_lib\tdt\<ipython console> in <module>()
C:\Python26\lib\site-packages\comtypes\__init__.pyc in func(obj, *args, **kw)
515 else:
516 def func(obj, *args, **kw):
--> 517 return self.Invoke(obj, memid, _invkind=1, *args, **kw)
# DISPATCH_METHOD
518 return func
519
C:\Python26\lib\site-packages\comtypes\automation.pyc in Invoke(self, dispid, *a
rgs, **kw)
699
700 for i, a in enumerate(args[::-1]):
--> 701 array[i].value = a
702
703 dp = DISPPARAMS()
C:\Python26\lib\site-packages\comtypes\automation.pyc in _set_value(self, value)
298 self._.VT_R4 = value
299 else:
--> 300 raise TypeError("Cannot put %r in VARIANT" % value)
301 # buffer -> SAFEARRAY of VT_UI1 ?
302
------------------------------------------------------------------------------
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