On lundi 27 novembre 2017 11:46:50 CET Sean Gillies wrote:
> I believe it's possible, yes, but it will be challenging. I'm not aware of
> anybody else doing this.
>
> In
> https://github.com/OSGeo/gdal/blob/trunk/gdal/swig/python/extensions/gdal_wr
> ap.cpp you can see examples of C++ functions that access the GDAL objects
> referenced by Python objects. This isn't a stable public API by any means,
> and therefore I hesitate to recommend it. Maybe Even would be able to
> comment more on how much support there is for the SWIG-generated C++ Python
> classes.
>
Yes should be doable by "importing" some SWIG_ methods from gdal_wrap.cpp. This
might be
fragile in case the SWIG_ wrapping structures evolve.
Interesting bits:
SWIGINTERN PyObject *_wrap_Dataset_RasterXSize_get(PyObject
*SWIGUNUSEDPARM(self), PyObject *args) {
PyObject *resultobj = 0; int bLocalUseExceptionsCode = bUseExceptions;
GDALDatasetShadow *arg1 = (GDALDatasetShadow *) 0 ;
void *argp1 = 0 ;
int res1 = 0 ;
PyObject * obj0 = 0 ;
int result;
if (!PyArg_ParseTuple(args,(char *)"O:Dataset_RasterXSize_get",&obj0))
SWIG_fail;
res1 = SWIG_ConvertPtr(obj0, &argp1,SWIGTYPE_p_GDALDatasetShadow, 0 | 0 );
if (!SWIG_IsOK(res1)) {
SWIG_exception_fail(SWIG_ArgError(res1), "in method '"
"Dataset_RasterXSize_get" "', argument " "1"" of type '" "GDALDatasetShadow
*""'");
}
arg1 = reinterpret_cast< GDALDatasetShadow * >(argp1);
....
}
(GDALDatasetShadow* is an alias of GDALDataset*)
static PyMethodDef SwigMethods[] = {
{ (char *)"Dataset_RasterXSize_get", _wrap_Dataset_RasterXSize_get,
METH_VARARGS, (char *)"Dataset_RasterXSize_get(Dataset self) -> int"},
}
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