【讨论】二次开发，网格划分时，获得的节点总数为何时0？

xskun

请二次开发高手帮我看看这个函数，为什么分网不成？
  
static void do_ugopen_api(void)  
{  
  char cue[] = "Select Objects";  
  char title[] = "User Title";  
  int response, count, i;  
  tag_t *object_id;  
  char buffer[200];  
  
  UF_SF_AMM_mesh_parameters_t mesh_params; /* <I> Mesh-parameters of 2d mesh*/  
  char *element_type="Tri3";        /*<I> element type. Has to be one of  
                    //   the following fouruad8, Quad4, Tri6, Tri3 */  
  int num_objects=1; /*<I> number of objects to mesh */  
// tag_t *object_id;     /*<I> Tag of the object to be meshed 前面已经定义了。 */  
  tag_t mesh_tag;           /*<O> */  
  int number_of_nodes;  
   
    if((UF_CALL(UF_UI_select_with_class_dialog(cue, title, UF_UI_SEL_SCOPE_WORK_PART,  
          NULL, NULL, &response, &count, &object_id))) == 0)  
    { UF_CALL(UF_UI_open_listing_window());  
    sprintf(buffer,"object count = %d\n",count);  
        UF_CALL(UF_UI_write_listing_window(buffer));  
         if (response == UF_UI_OK && count > 0)  
         {  
             for (i=0; i<count; i++)  
             {  
         sprintf(buffer,"object tag = %d\n", object_id);  
         UF_CALL(UF_UI_write_listing_window(buffer));  
                 UF_DISP_set_highlight(object_id, 0);  
             }  
  
            // UF_free(object_id);  
         }  
    }  
  mesh_params.mesh_dimension=UF_SF_DIMENSION_2D;  
  mesh_params.midnode_needed=0;  
  mesh_params.overall_elem_size=4;  
  mesh_params.quad_splitting=0;  
  UF_CALL(UF_SF_create_2d_ansys_mesh(&mesh_params,element_type,count,object_id,&mesh_tag));  
  UF_free(object_id);  
  UF_CALL(UF_SF_count_nodes(mesh_tag,&number_of_nodes));  
  sprintf(buffer,"number of nodes is : = %d\n", number_of_nodes);  
  UF_CALL(UF_UI_write_listing_window(buffer));  
}  
  
编译、链接和运行都可以，启动ug18后，先打开一个sheet零件件，进入modeling，然后调用该程序生成的mesh_ansys_2d.dll,选择该sheet进行网格划分，最后出错，而且节点数为0。这是为什么？请大侠指点！多谢！  
  
附件可以直接运行，