"ProElemtreeElementAdd" does not work!

Hi,

here is an example to create a Datum plane:

void createADatumPane(ProMdl mdl, ProFeature * csys, int c_sys_pane_type, wchar_t * panename, ProFeature * feat) {
 ProElement pro_e_feature_tree, pro_e_feature_type, elem_const_type, elem_offset, pro_e_std_feature_name, elem_consts, elem_offset_ref;
 ProErrorlist errs;
 ProError tkerr;
 ProValueData value_data;
 ProValue value;
 ProFeatureCreateOptions opts[1];
 ProName wide_string = L"";
 ProModelitem p_mdl_itm;
 ProSelection sel;

 ProElementAlloc(PRO_E_FEATURE_TREE, &pro_e_feature_tree);

 ProElementAlloc(PRO_E_FEATURE_TYPE, &pro_e_feature_type);
 value_data.type = PRO_VALUE_TYPE_INT;
 value_data.v.i = PRO_FEAT_DATUM; 
 ProValueAlloc(&value);
 ProValueDataSet ( value, &value_data );
 ProElementValueSet ( pro_e_feature_type, value );
 ProElemtreeElementAdd ( pro_e_feature_tree, NULL, pro_e_feature_type );
 
 if (panename != NULL) {
  wcscpy_s(wide_string, PRO_NAME_SIZE, panename);
  ProElementAlloc(PRO_E_STD_FEATURE_NAME, &pro_e_std_feature_name);
  value_data.type = PRO_VALUE_TYPE_WSTRING;
  value_data.v.w = wide_string;
  ProValueAlloc(&value);
  ProValueDataSet(value, &value_data);
  ProElementValueSet(pro_e_std_feature_name, value);
  ProElemtreeElementAdd(pro_e_feature_tree, NULL, pro_e_std_feature_name);
 }
 ProElementAlloc (PRO_E_DTMPLN_CONSTRAINTS, &elem_consts);
 ProElemtreeElementAdd (pro_e_feature_tree, NULL, elem_consts);
 
 ProElementAlloc (PRO_E_DTMPLN_CONSTRAINT, &elem_offset);
 ProElemtreeElementAdd (elem_consts, NULL, elem_offset);

 ProElementAlloc(PRO_E_DTMPLN_CONSTR_TYPE, &elem_const_type);
 value_data.type = PRO_VALUE_TYPE_INT;
 value_data.v.i = c_sys_pane_type;
 ProValueAlloc(&value);
 ProValueDataSet(value, &value_data);
 ProElementValueSet(elem_const_type, value);
 ProElemtreeElementAdd(elem_offset, NULL, elem_const_type);

 if (csys != NULL) {
  ProSelection selection;
  ProReference ref;
  ProElementAlloc(PRO_E_DTMPLN_CONSTR_REF, &elem_offset_ref);
  if (ProSelectionAlloc(NULL, csys, &selection) != PRO_TK_NO_ERROR) writeRunnerLog(L"m2", 2);;
  if (ProSelectionToReference(selection, &ref) != PRO_TK_NO_ERROR) writeRunnerLog(L"m3", 2);;
  if (ProElementReferenceSet(elem_offset_ref, ref) != PRO_TK_NO_ERROR) writeRunnerLog(L"m4", 2);;
  ProElemtreeElementAdd(elem_offset, NULL, elem_offset_ref);
 }

 opts[0] = PRO_FEAT_CR_DEFINE_MISS_ELEMS;
 ProMdlToModelitem(mdl, &p_mdl_itm);
 ProSelectionAlloc(NULL, &p_mdl_itm, &sel);
 tkerr = ProFeatureCreate(sel, pro_e_feature_tree, opts, 1, feat, &errs);
 if (tkerr != PRO_TK_NO_ERROR) {
  writeRunnerLog(L"Can't create the datum pane.", 2);
 } else {
  setCost(1);
 }
 ProSelectionFree(&sel);
 ProElementFree(&pro_e_feature_tree);
}

Not much documentation, but I think you'll get out the needed code block to create elements out of these example.

Br,

Eike