v->getsamples = my_getsamples;
v->close = my_close;
v->getimage = my_getimage;
v->getsamples = my_getsamples;
v->setparameter = my_setparameter;
v->getsamples = my_getsamples;
v->close = my_close;
v->getimage = my_getimage;
v->getsamples = my_getsamples;
v->setparameter = my_setparameter;