python comtypes如何将numpy float32（singe-precision float）作为标量传递？

Question

According to comtypes documentation is is possible to pass numpy arrays to comtypes objects, but how to I pass scalar values, eg numpy.float32(1.0) ?

https://pythonhosted.org/comtypes/#numpy-interop

I get following error:

---------------------------------------------------------------------------
ArgumentError                             Traceback (most recent call last)
<ipython-input-67-9e7e5859c6a5> in <module>()
----> 1 com_obj.Update("string_name",np.float32(6.6e-6))
ArgumentError: argument 2: <type 'exceptions.TypeError'>: Cannot put 6.5999998e-06 in VARIANT

Answer 1

Passing ctypes.c_float rather than np.float32 will work. eg com_obj.Update("string_name", ctypes.c_float(6.6e-6)) .