pass float array(list) parameter to C

[zaley]

On Mar 17, 10:59 pm, marek.ro... at wp.pl wrote:
> You can also do it with ctypes only; too bad it's not really well
> documented. c_float is a type of a floating point number and it has *
> operator defined, so that c_float*4 is a type of a 4-element array of
> those numbers. So if you want to construct an array of floats from a
> list of floats, you can do it like this:
>
> from ctypes import c_float
>
> x = [1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9]
> float_array_type = c_float*len(x)
> float_array = float_array_type(*x)
> print float_array

Is there has any difference between the following arrays ？

Buf0=(c_float* 9)(57,57,57,57,57,5,5,5,5)
Buf0=array('f', [57,57,57,57,57,5,5,5,5])

function called like this in python:
ret= SetAnalog(9,Buf0)

function prototype in C  like this
int SetAnalog(UINT uChannel,float* pBuf)
{
  .......
}