void cvInitTreeNodeIterator(CvTreeNodeIterator* tree_iterator, void* first, int max_level) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvInitTreeNodeIterator_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvInitTreeNodeIterator, tree_iterator, first, max_level);
}
