UG/Open中怎么生成二维工程图？

ENTE003

贴上代码

1.         tag_t        Link_drawing_tag;
   
2.         char*        Link_drawing_name = "_model1";        //图纸标签
   
3.         UF_DRAW_info_t        drawing_info;        //图纸信息
   
4.         UF_DRAW_metric_size_e        drawsize;
   
5.         drawsize = UF_DRAW_A0;        //图纸大小
   
6.         UF_DRAW_size_union_u        drawunion;
   
7.         drawunion.metric_size_code = drawsize;
   
8.         drawing_info.size_state = UF_DRAW_METRIC_SIZE;
   
9.         drawing_info.size = drawunion;
   
10.         drawing_info.drawing_scale = 1;        //设置比例
    
11.         drawing_info.units = 1;        //设置单位
    
12.         drawing_info.projection_angle = UF_DRAW_FIRST_ANGLE_PROJECTION;
    
13.         UF_CALL(UF_DRAW_create_drawing(Link_drawing_name, &drawing_info, &Link_drawing_tag));
    
14.         UF_CALL(UF_DRAW_ask_drawing_info(Link_drawing_tag, &drawing_info));
    
15.         UF_CALL(UF_DRAW_open_drawing(Link_drawing_tag));
    
16. 
    
17. 
    
18.         double        reference_point[2] = { 70.0,160.0 };
    
19.         tag_t        drawing_tag = NULL_TAG;
    
20.         tag_t        part_tag = NULL_TAG;
    
21.         tag_t        view_tag = NULL_TAG;
    
22.         tag_t        draw_view_tag = NULL_TAG;
    
23.         char        *view_name = " BOTTOM";
    
24.         UF_DRAW_view_info_t        view_info;
    
25.         view_info.view_scale = UF_DRAW_ACTIVE_VIEW;
    
26.         view_info.anchor_point = NULL_TAG;
    
27.         view_info.view_scale = 1.0;
    
28.         view_info.use_ref_pt = FALSE;
    
29.         view_info.inherit_boundary = FALSE;
    
30.         view_info.transfer_annotation = TRUE;
    
31.         UF_DRAW_view_prfs_t        view_display_parms;
    
32.         part_tag = UF_PART_ask_display_part();        //通过查询函数，得到当前打开模型的标识
    
33.         UF_DRAW_ask_current_drawing(&drawing_tag);        //查询当前图纸的标识
    
34.         UF_CALL(UF_OBJ_cycle_by_name(view_name, &view_tag));
    
35.         UF_CALL(UF_DRAW_import_view(drawing_tag, view_tag, reference_point, &view_info, &draw_view_tag));
    
36.         //创建俯视图函数
    
37.         UF_CALL(UF_DRAW_set_view_display(drawing_tag, &view_display_parms));
    
38.         //设置视图的显示
    
39.         UF_DRAW_update_one_view(drawing_tag, draw_view_tag);
    
40.         //更新视图的显示函数

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运行报错

1. +++ Input tag is null.
   
2. UF_DRAW_import_view(drawing_tag, view_tag, reference_point, &view_info, &draw_view_tag);
   
3. *** ERROR code 1405026 at line 120 in NX10_Open_Wizard2.cpp:
   
4. +++ Input tag is not a view.
   
5. UF_DRAW_set_view_display(drawing_tag, &view_display_parms);
   

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请求帮助啊