获取部件中所有的表达式，并对表达式进行更改，更新模型

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获取部件中所有的表达式，并对表达式进行更改，更新模型
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结果：

; V! T5 |  x& ]7 n* ^Before change the value :
p0=20
, P8 q5 W. `% O$ E$ yp1=h
w=100
; [' }1 t2 K9 I6 m/ \h=20
' Y0 R4 x4 }2 s5 C& a9 Il=200
! h7 J$ g" W+ w& m  UStart to change the expressions :
p0=20
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- v3 [) m. E7 r# Q$ B0 O( @w=100
0 b$ D$ ?( d) Z& w9 bh=20
l=200

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1. <p>
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2. static void do_UGopen_api(void)
   
3. {
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4. // create block 1
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5. double coner[3] = {0,0,0};
   
6. char *edges[3] = {"l=100","w=100","h=20"};
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7. tag_t blk_tag;
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8. UF_MODL_create_block1(UF_NULLSIGN,coner,edges,&blk_tag);
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9. // create a hole
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10. double dir[3] = {0,0,1};
    
11. double coner1[3] = {50,50,0};
    
12. tag_t cyl_tag;
    
13. UF_MODL_create_cyl1(UF_NEGATIVE,coner1,"h","20",dir,&cyl_tag);</p><p> // get the expressions
    
14. tag_t part=UF_PART_ask_display_part();
    
15. int number_of_exps = 0;
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16. tag_t *exps;
    
17. char *str;
    
18. char expStr[133];
    
19. UF_UI_open_listing_window();
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20. UF_MODL_ask_exps_of_part(part,&number_of_exps,&exps);
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21. UF_UI_write_listing_window("Before change the value : \n");
    
22. for(int i = 0 ; i < number_of_exps;i++)
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23. {
    
24.       
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25.    UF_MODL_ask_exp_tag_string(exps[i],&str);
    
26.    UF_UI_write_listing_window(str);
    
27.    UF_UI_write_listing_window("\n");
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28.    UF_free(str);
    
29. }
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30. 
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31. UF_free(exps);
    
32. //Start to change the expressions
    
33. UF_UI_write_listing_window("Start to change the expressions : \n");
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34. char *exp_str = "l = 200";
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35. UF_MODL_edit_exp(exp_str);
    
36. UF_MODL_update();
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37. exp_str = "\0";
    
38. //get the new exps
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39. UF_MODL_ask_exps_of_part(part,&number_of_exps,&exps);
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40. for(int i = 0 ; i < number_of_exps;i++)
    
41. {
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42.    UF_MODL_ask_exp_tag_string(exps[i],&str);
    
43.    UF_UI_write_listing_window(str);
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44.    UF_UI_write_listing_window("\n");
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45.    UF_free(str);
    
46. }
    
47. UF_free(exps);
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48. }</p><p> </p>

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