How to use Swig typemap for a pointer to struct

Asked Feb 22 '14 at 20:57

Active Feb 22 '14 at 20:57

Viewed 473 times

I have a C function:

int isInPolygon(Point testPoint, Point* polygon, int n);

and the point is a simple struct:

typedef struct  {
int x;
int y;} Point;

Also Polygon is a list of Points.I defined a typemap in interface for Point:

%typemap(in) (Point testPoint){
if (!PyTuple_Check($input)) {
    PyErr_SetString(PyExc_ValueError, "Expecting a point in a tupple!");
    return NULL;
}}

How can I do that for Polygon?

asked Feb 22 '14 at 20:57

Farshid Ashouri

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Iterate over the list and, for each object, ensure it is a point. How do you expect to be done otherwise? – michaelmeyer Feb 22 '14 at 21:23
I found it's usefull to use `%array_class(Point, Polygon);`, but I got a segmentation fault. – Farshid Ashouri Feb 22 '14 at 21:52
Just for a reference, [Here](https://github.com/ourway/point_in_polygon/blob/master/PointInPolygon.c#L79) is the function i want to use in python. – Farshid Ashouri Feb 22 '14 at 21:58
@doukremt: Thats my problem. How can I `1.`Iterate | `2.`insure and finally, how can i get rid of that `int n` in the source C function? – Farshid Ashouri Feb 22 '14 at 22:01
Check the C API. And prepare yourself to write a lot of boilerplate. – michaelmeyer Feb 22 '14 at 22:42

How to use Swig typemap for a pointer to struct

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