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函数说明：
创建一个线程功能。指定要在创建参数螺纹参数结构。对于内螺纹，论证“internal_thread”应在参数设置为“TRUE”这是指向线程参数结构UF_MODL_symb_thread_data_s。

函数参数：
第1个参数为输入：
parameters代表参数变量，UF_MODL_symb_thread_data_p_t 为输入参数类型，指向线程参数结构UF_MODL symb_thread_data_s

第2个参数为输出：
thread_obj_id代表参数变量，tag_t * 为输出参数类型，线程对象标识符

UF_MODL_create_symb_thread函数实例代码演示：
这个例子创建符号thread.part。该代码创建一个块用象征性的线程。
[quote]
#include <stdio.h>
#include <math.h>
#include <uf.h>
#include <uf_modl.h>
#include <uf_part.h>
#define UF_CALL(X) (report( __FILE__, __LINE__, #X, (X)))
static int report( char *file, int line, char *call, int irc)
{
if (irc)
{
char messg[133];
printf("%s, line %d: %s\n", file, line, call);
(UF_get_fail_message(irc, messg)) ?
printf(" returned a %d\n", irc) :
printf(" returned error %d: %s\n", irc, messg);
}
return(irc);
}
static void do_ugopen_api(void)
{
tag_t part_tag;
tag_t blk_id, feature_eid, boss_id;
tag_t face, s_face, c_face;
char *part_name = "symbolic_thread";
char *edge_len[3];
double point[3], dir[3], box[6], radius, rad;
int i, num, type, sen;
uf_list_p_t list;
UF_MODL_symb_thread_data_t thread;
UF_CALL(UF_PART_new(part_name,ENGLISH,&part_tag));
/*
Create block(10x10x10) at (0,0,0)
*/
edge_len[0] = "10.0";
edge_len[1] = "10.0";
edge_len[2] = "10.0";
point[0] = 0.0, point[1] = 0.0, point[2] = 0.0;

UF_CALL(UF_MODL_create_block1(UF_NULLSIGN,point,edge_len,&blk_id));
/*
Get faces of the block
*/
UF_CALL(UF_MODL_ask_feat_faces(blk_id,&list));
UF_CALL(UF_MODL_ask_list_count(list,&num));
/*
Get face data
*/
for (i=0; i<num; i++)
{
UF_CALL(UF_MODL_ask_list_item(list,i,&face));
UF_CALL(UF_MODL_ask_face_data(face,&type,point,
dir,box,&radius,&rad,&sen));
if (fabs(dir[2]-1.0)< 10e-7)
{
point[0] = box[0] + 2.0;
point[1] = box[1] + 2.0;
UF_CALL(UF_MODL_create_boss(point,dir, "0.85","0.6","0.0",face,&boss_id));
break;
}
}
UF_MODL_delete_list(&list);
/*
Get boss feature faces
*/
UF_MODL_ask_feat_faces(boss_id,&list);
UF_MODL_ask_list_count(list,&num);
for (i=0;i<num;i++)
{
UF_CALL(UF_MODL_ask_list_item(list,i,&face));

UF_CALL(UF_MODL_ask_face_data(face,&type,point,dir,box,
&radius,&rad,&sen));
if (type == 22) /* Planar face */
s_face = face;
if (type == 16) /* Cylindrical face */
c_face = face;
}
UF_MODL_delete_list(&list);
/*
Create symbolic thread
*/
thread.cyl_face = c_face;
thread.start_face = s_face;
thread.axis_direction[0]=0;
thread.axis_direction[1]=0;
thread.axis_direction[2]=-1;
thread.include_instances = UF_MODL_INCL_INSTANCES;
thread.rotation=UF_MODL_RIGHT_HAND;
thread.length_flag=UF_MODL_FIXED_LENGTH;
thread.tapered = UF_MODL_NON_TAPERED;
thread.num_starts = 1;
thread.length="1.0";
thread.form = "Unified";
thread.method = "CUT";
thread.callout = "1-8_UNC";
thread.major_dia = "1.0";
thread.minor_dia = "0.8512";
thread.tapped_dia = "0.8985";
thread.pitch = "0.125";
thread.angle = "60";
UF_CALL(UF_MODL_create_symb_thread(&thread, &feature_eid));
/*
Retrieve data
*/
if(!UF_CALL(UF_MODL_ask_symb_thread_parms(feature_eid, &thread)))
{
/*
Print data
*/
printf("Cylindrical face tag = %d\n", thread.cyl_face);
printf("Start face tag = %d\n", thread.start_face);
printf("Thread axis direction = (%f,%f,%f)\n",
thread.axis_direction[0],thread.axis_direction[1],
thread.axis_direction[2]);
printf("Number of starts = %d\n", thread.num_starts);
if (thread.include_instances == UF_MODL_INCL_INSTANCES)
printf("Include instances = Yes\n");
else
printf("Include instances = No\n");
if (thread.rotation == UF_MODL_RIGHT_HAND)
printf("Rotation = Right_hand\n");
else
printf("Rotation = Left_hand\n");
if (thread.length_flag == UF_MODL_FIXED_LENGTH)
printf("Thread length flag = Fixed length\n");
else
printf("Thread length flag = Full thread\n");
if (thread.tapered == UF_MODL_TAPERED)
printf("Thread tapered = Yes\n");
else
printf("Thread tapered = No\n");
printf("Length expression %s\n", thread.length);
printf("Form = %s\n", thread.form);
printf("Callout = %s\n", thread.callout);
printf("Method = %s\n", thread.method);
printf("Major diameter expression %s\n", thread.major_dia);
printf("Minor diameter expression %s\n", thread.minor_dia);
printf("Tapped diameter expression %s\n", thread.tapped_dia);
printf("Pitch expression %s\n", thread.pitch);
printf("Angle expression %s\n", thread.angle);
}
UF_free(thread.length);
UF_free(thread.form);
UF_free(thread.method);
UF_free(thread.callout);
UF_free(thread.major_dia);
UF_free(thread.minor_dia);
UF_free(thread.tapped_dia);
UF_free(thread.pitch);
UF_free(thread.angle);
}
/*ARGSUSED*/
void ufusr(char *param, int *retcode, int param_len)
{
if (!UF_CALL(UF_initialize()))
{
do_ugopen_api();
UF_CALL(UF_terminate());
}
}
int ufusr_ask_unload(void)
{
return (UF_UNLOAD_IMMEDIATELY);
}

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