使用 UF_MODL_ask_extrusion问题

pppflak

我用以下代码去得到一个拉伸特征的信息.但是执行之后却什么都得不到.运行错误代码为"UNKNOWN FEATURE TYPE".请问我程序哪里出错了啊??我做测试的模型是一个在ug手动拉伸的正方形.希望各位高手指点啊....
7 f6 k5 a" q6 B$ ctag_t part1;
int type=UF_feature_type;
- G' D- G. ^& i) Otag_t feature=NULL_TAG;
int a;
char * feature_type;
char msg[100];
+ i6 W% r) G9 D- Pint * n_o;
tag_t * objects;
8 x- x$ I: Y) z0 ]UF_MODL_SWEEP_TRIM_object_p_t trim_ptr;
8 j: |8 _) |! c2 l. C! p$ qchar * taper_angle;
6 i- |8 r% _# M) R/ ?6 ]/ Zchar *limits[2];
3 B8 G  U) z9 }7 q5 ]  o6 y+ Vchar *offsets[2];
double region_point[3],direction[3];
* y- k1 U4 B, ]5 Alogical * region_specified;
logical * solid_creation;
# F* ?3 J/ b- h- Y/ R$ Fpart1=UF_PART_ask_nth_part(0);
  E. T! Y; @1 z) tUF_OBJ_cycle_objs_in_part(part1,type,&feature);
. n; p; {+ f: ^9 G$ Sfor (i=0;feature!=NULL;i++)
{
3 P1 l* q7 H, _* ~) ?    UF_OBJ_cycle_objs_in_part(part1,type,&feature);
/ t% G4 n/ S) h    UF_MODL_ask_feat_type(feature,&feature_type);
   if(strcmp(feature_type,"EXTRUDE")==0)
5 X: E, F. p7 x# c* J   {
    a=UF_MODL_ask_extrusion(feature,n_o,&objects,&trim_ptr,&taper_angle,limits,offsets,region_point,region_specified, solid_creation,direction );
/ K8 p9 o% p8 Z# _4 q( D0 L    UF_get_fail_message(a,msg);
    uc1601(msg,1);
: z$ ?5 E0 w+ T: N+ I   }
/ `. Z! N/ @& o( j) z/ B; J# `4 E. J}