[SciPy-User] [SciPy-user] numpy and C

Charles R Harris charlesr.harris@gmail....
Tue Jun 8 22:28:43 CDT 2010

On Thu, Jun 3, 2010 at 7:36 AM, tinauser <tinauser@libero.it> wrote:

> Hallo,
> I'm pretty new with both Python and C
> I have a C application that run a python script.The python script then uses
> some
> C functions written in the code that embedd the script itself.
> I want to pass array from the C code (where an API is giving pointer to
> data
> I
> want to plot in Python) and Python (a GUI).
> What I've done so far  is to allocate before calling the Pyhon script a
> PyArray
> with PyArray_SimpleNew. Since the data are unsigned char, the command is:
> my_second_array = (PyArrayObject *)PyArray_SimpleNew(2,dim,NPY_UBYTE);
> When I call the Python script,I sent my_second_array.On a timer,
> my_second_array
> is used as a parameter for a C written function: the idea is to assign the
> pointer of a frame to my_second_array.data.
> PyArrayObject *Pymatout_img=NULL;
> PyArg_ParseTuple(args, "O", &Pymatout_img);//Pymatout_img is the matrix
> that
> was
> created in C during the initialization with PyArray_SimpleNew
> Pymatout_img->data= cam_frame->data;
> The problem is that the compiler (I'm using visual C 2008) says that cannot
> convert *char to *unsigned char...
> Can someone explains me what i'm doing wrong?
Can you show the code that is causing the problem? There should be a line
number somewhere.

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