[求助]用鼠标选择对象的问题

sencewm

依然是菜鸟求助
- A" o6 Z" F4 K0 ~. x: k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。
9 ]- B% Z8 ~0 r" @9 u* Qint GP_action_0_act_cb ( int dialog_id,
5 Q) l4 m$ ]8 T2 p& {9 U4 a             void * client_data,
             UF_STYLER_item_value_type_p_t callback_data)
7 v- ~& |8 W# y. n" ]5 d, x{
) r9 R1 a4 q/ q9 v7 T3 a: _     /* Make sure User Function is available. */  
     if ( UF_initialize() != 0)
! Z) W& R/ |8 B  x' r4 c          return ( UF_UI_CB_CONTINUE_DIALOG );

     /* ---- Enter your callback code here ----- */
char message[133];
message[0]='\0';
* E. c1 w; b9 G9 v! Gstrcpy(message, "请选择一条曲线");
UF_UI_selection_options_t opts;
3 z  Y3 p) |3 ~8 k8 [% h! t* P8 iUF_UI_mask_t mask;
int response;
/ A: Z4 t! p2 h0 Etag_t object, view;
; J# g) |+ t1 fdouble cursor[3];
int unhighlight=0;
+ ]8 Z+ E. Q- M2 v9 X" C

' |$ }2 h/ f9 L0 I% o5 D3 G
UF_initialize();
opts.other_options=0;
5 A1 q6 g5 F4 M( Q* s/ sopts.reserved=NULL;
opts.num_mask_triples=1;
opts.mask_triples=&mask;
% p' Z1 ?1 @3 m
opts.mask_triples->object_type=UF_spline_type;
opts.mask_triples->object_subtype=0;
3 I" _1 X& a% w! K3 Q8 t9 |3 hopts.mask_triples->solid_type=0;
  g: g. ?% r4 z' _
opts.scope=UF_UI_SEL_SCOPE_ANY_IN_ASSEMBLY;
7 A% v/ ], A6 C7 N6 p1 b$ [9 p$ edouble port[3];
7 S" h4 l1 K5 r$ p/ O

" R, r2 {  `( L, N5 N5 ?. j& Bdo{int irc=UF_UI_select_single(message, &opts, &response, &object, cursor, &view);}

: p; B% i1 g2 O2 D" V- Twhile (!(response==UF_UI_OBJECT_SELECTED));
if (response!=UF_UI_OBJECT_SELECTED)
, t+ p0 `, \$ Q: {5 y{
uc1601("No Curve Selected",1);
) x' T9 P7 Q6 yUF_terminate ();
return (UF_UI_CB_CONTINUE_DIALOG);
$ W' y. b; {, B, J( S}       
  

7 `, T* j1 b; W4 Pint ret=UF_MODL_ask_curve_props(object,0.5,port,NULL,NULL,NULL,NULL,NULL);
  char message2[133];
5 f! o3 [7 x/ |# p$ w. Z" ?  v  message2[0]='\0';
+ z( j" [3 }2 S" i) @  sprintf (message2, "曲线中点坐标为：%f,%f,%f",port[0],port[1],port[2]);
$ W, F, o7 r8 X+ C) L! D6 y6 O+ a  uc1601(message2,1);
0 F) r1 I" X: ~) U( p+ a
) i' B1 v8 \! Q' @) e$ D9 s
6 C5 U" D$ [# o; Q1 X$ {  G
UF_terminate ();
' u1 g7 w/ w, ^5 I$ _4 S; c2 D' i- t0 dreturn (UF_UI_CB_CONTINUE_DIALOG);
   }