Hamish wrote:
> > The argument must be a pointer, try
> >
> > G_is_null_value(byref(in_rast[col]), data_type)
> >
> > or
> > in_val = in_rast[col]
> > G_is_null_value(byref(in_val), data_type)
>
> no joy, both those come back with:
>
> if not G_is_null_value(byref(in_rast[col]), data_type):
> TypeError: byref() argument must be a ctypes instance, not 'int'
import grass.lib.raster as rast
...
in_val = rast.CELL(in_rast[col])
G_is_null_value(byref(in_val), data_type)
ctypes automatically converts the result of an array acces to a Python
type, while byref() requires a ctypes type. And pointer arithmetic
still isn't implemented (i.e. there's no simple way to get a pointer
to any element of an array other than the first).
--
Glynn Clements <gl...@gclements.plus.com>
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