[求助]用鼠标选择对象的问题

sencewm

依然是菜鸟求助
3 j- I# j7 A. T我用UIStyler建立了一个按钮，那如何实现：点击该按钮后可以用鼠标选择一曲线，然后获得它的中点，我的程序如下，但是似乎总是死循环。
int GP_action_0_act_cb ( int dialog_id,
  b6 M5 ?& B( J             void * client_data,
1 c6 _% r+ W/ S, T& n5 e             UF_STYLER_item_value_type_p_t callback_data)
7 ~6 j- o, ^2 w4 @. S  t2 Z{
     /* Make sure User Function is available. */  
     if ( UF_initialize() != 0)
( }/ E# ]7 N# U( E          return ( UF_UI_CB_CONTINUE_DIALOG );
6 D- F1 K% `, h, a# A
) h- e, E  x# ]. _0 H! f" l* s     /* ---- Enter your callback code here ----- */
char message[133];
message[0]='\0';
strcpy(message, "请选择一条曲线");
5 {2 e& L* J9 ?5 M# rUF_UI_selection_options_t opts;
+ j) A4 C4 ^* v* i1 X% c4 t! ~4 P0 x9 ?UF_UI_mask_t mask;
  R  ]& e# c+ ^0 U9 Kint response;
5 U6 m& \! r$ R: Btag_t object, view;
6 j) Y) O. Z, C% |# i/ z6 J$ ldouble cursor[3];
int unhighlight=0;
1 V3 Z3 r1 n" |& [1 T
2 I3 G% F1 ~( `- O# K3 F( A  j' l

' B8 r) ^$ I* t6 g1 uUF_initialize();
opts.other_options=0;
opts.reserved=NULL;
! l: b% X0 {! Fopts.num_mask_triples=1;
( D. `: d6 C# c0 x# n3 Zopts.mask_triples=&mask;

opts.mask_triples->object_type=UF_spline_type;
opts.mask_triples->object_subtype=0;
opts.mask_triples->solid_type=0;

opts.scope=UF_UI_SEL_SCOPE_ANY_IN_ASSEMBLY;
double port[3];


5 _! Y5 v! f( P( p* g2 Udo{int irc=UF_UI_select_single(message, &opts, &response, &object, cursor, &view);}

: S1 R7 ^( ?& i7 j& ywhile (!(response==UF_UI_OBJECT_SELECTED));
if (response!=UF_UI_OBJECT_SELECTED)
{
( l9 ]6 g6 y4 ]+ q6 P% guc1601("No Curve Selected",1);
UF_terminate ();
: j. r' n3 G* ^3 F2 I1 ]+ T! {return (UF_UI_CB_CONTINUE_DIALOG);
}       
  

* B6 _* f4 l0 R3 ]int ret=UF_MODL_ask_curve_props(object,0.5,port,NULL,NULL,NULL,NULL,NULL);
  char message2[133];
2 h! ]: T) Y$ L: r  message2[0]='\0';
3 R# [2 l0 t, y0 {4 v# ]  D/ N% z  sprintf (message2, "曲线中点坐标为：%f,%f,%f",port[0],port[1],port[2]);
  uc1601(message2,1);

: e. ~7 f2 _2 x; u
# Z: R; k3 a( I3 L! ?
UF_terminate ();
* }" t# a, J# B7 m& xreturn (UF_UI_CB_CONTINUE_DIALOG);
   }