Thank you Sean.
What I want to do is to compile C/C++ code into "_my_c_module.pyd" and then to
be called by Python. The Python code passes an argument to C/C++.
I did previously by passing a file name (str) or a numpy array as argument to
C/C++, and it is all good.
This time I want to pass a gdal dataset as an argument:
in Python:
from osgeo import gdal
import _my_c_module
ds=gdal.Open('my_filename")
result = _my_c_module.function1(ds)
is this possible? If yes, how?
Shawn
________________________________
From: Sean Gillies [[email protected]]
Sent: November-27-17 11:09 AM
To: Shawn Gong
Cc: [email protected]
Subject: Re: [gdal-dev] pass gdal dataset as an argument from Python to C
Shawn,
PyObject and GDALDatasetH are incompatible types and you can't pass the former
to a function that expects the latter. I'm surprised your program can compile
with these incompatible types.
Do you mean for your module to extend GDAL's Python bindings? If you look
inside the C code of GDAL's Python bindings you may be able to see how to get
the GDALDatasetH associated with a Python dataset object.
Hope this helps,
On Thu, Nov 23, 2017 at 1:25 PM, Shawn Gong
<[email protected]<mailto:[email protected]>> wrote:
Hi list,
Has anyone done this before?
I try to pass a gdal dataset as an argument from Python to C.
in my C code, I have
PyObject* py_my_func(PyObject *self, PyObject *args)
{
PyObject *poDataset;
if(!PyArg_ParseTuple(args, "Odd", &poDataset, &a1, &a2))
{
return NULL;
}
my_func(poDataset, a1, a2);
}
void my_func(GDALDatasetH hDataset, double a1, double a2)
{
}
Python crashed and hDataset was NULL
Is it possible to do or I did something wrong?
BTW, I have passed either a filename or a gdal array as an argument from Python
to C, with success.
Thanks,
Shawn
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