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：

2 W1 J0 i* C9 F& r' d8 K. o; gBefore change the value :
p0=20
8 ~8 M: U9 G* X4 up1=h
w=100
1 E7 I2 U, c4 ]h=20
+ C* Q" P! e8 w! S/ ~% Rl=200
- O: R" B1 ~" t6 P& L: XStart to change the expressions :
' }2 H9 o( {+ X& t& D: m, Np0=20
p1=h
w=100
2 @6 Y( h* V$ \6 _" g' j5 hh=20
l=200
& x  `8 k, O& b8 ^9 j' q6 B
+ Z2 T" T* {' s2 o2 ~
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1. <p>
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2. static void do_UGopen_api(void)
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3. {
   
4. // create block 1
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5. double coner[3] = {0,0,0};
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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);
   
9. // create a hole
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10. double dir[3] = {0,0,1};
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11. double coner1[3] = {50,50,0};
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12. tag_t cyl_tag;
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13. UF_MODL_create_cyl1(UF_NEGATIVE,coner1,"h","20",dir,&cyl_tag);</p><p> // get the expressions
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14. tag_t part=UF_PART_ask_display_part();
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15. int number_of_exps = 0;
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16. tag_t *exps;
    
17. char *str;
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18. char expStr[133];
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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");
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22. for(int i = 0 ; i < number_of_exps;i++)
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23. {
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24.       
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25.    UF_MODL_ask_exp_tag_string(exps[i],&str);
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26.    UF_UI_write_listing_window(str);
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27.    UF_UI_write_listing_window("\n");
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28.    UF_free(str);
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29. }
    
30. 
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31. UF_free(exps);
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32. //Start to change the expressions
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33. UF_UI_write_listing_window("Start to change the expressions : \n");
    
34. char *exp_str = "l = 200";
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35. UF_MODL_edit_exp(exp_str);
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36. UF_MODL_update();
    
37. exp_str = "\0";
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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. {
    
42.    UF_MODL_ask_exp_tag_string(exps[i],&str);
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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);
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46. }
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47. UF_free(exps);
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48. }</p><p> </p>

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