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函数说明：
内部开放的API入口点。您可以使用ufusr作为主要功能为切入点所有内部开放API 程式。所述ufusr功能也可用于用户退出。对于C语言编写的程序内部，第三个参数必须是传递到“ufusr”功能。这第三个变量是的长度字符数组参数。

函数参数：
第1个参数为输入：
输入char * 字符类型的参数，参数的变量格式为param，如果此功能从手稿调用，这个参数将包含所选的菜单按钮的名称。否则，这种说法是不使用的。

第2个参数为输出：
输出int * 整数型的参数，参数的变量格式为retcod，返回代码。未使用内部开放的API。

第3个参数为输入：
输入int 整数型的参数，参数的变量格式为param_len，'参数'参数长度。 NX处理此输入你。

ufusr函数实例代码演示：
这是内部用户功能编写了一个C程序示例。其原意是一个小的，预先编写好的程序，以便用户可以测试其系统内部UFUN以确保它的工作原理。参数参数输入，但未使用retcod返回代码输出'参数'参数输入的长度param_len
[quote]
#include <stdio.h>
#include <uf_defs.h>
#include <uf.h>
#include <uf_ui.h>
#include <uf_cfi.h>
#include <uf_curve.h>
#include <uf_obj.h>
#include <uf_part.h>
#include <uf_assem.h>
#include <uf_cfi.h>

static void report_error( int error_code, char *msg_text, char *part_name );

#define WAIT 1
#define PART 2

extern void ufusr( char *param, int *retcod, int param_len )
{
static char title[] = "CHOOSE OPTION";
static char menu[6][37+1] = { "POINT",
"LINE",
"ARC",
"DELETE LAST ENTITY",
"CHANGE ARC MODE",
"EXIT PROGRAM" };

static char mdmenu[2][37+1] = { "PARTIAL ARC",
"FULL CIRCLE" };

static char linmsg[2][18] = { "CHOOSE LINE START",
"CHOOSE LINE END" };

static char arcmsg[] = "CHOOSE POINT #";
static char prtnam[MAX_FSPEC_BUFSIZE] = "blank";

int choice; /* User Choice */
int defalt[2]; /* Default Point Selection Type*/
tag_t entid = 0; /* Entity Identifer */
int idum; /* Dummy Integer Variable */
int mode = 1; /* Arc Creation Mode */
double point1[3]; /* Point Data Variable */
double point2[3]; /* Point Data Variable */
double point3[3]; /* Point Data Variable */
int status; /* Status */
int nopart; /* No active part flag */
int pos_returned; /* Pos returned flag from menu */
int rejected = 0; /* Reject flag from menu */
/* */
tag_t part_tag; /* Part Tag of Part */
UF_PART_load_status_t /* */
load_status; /* Structure to hold any */
/* errors when loading part */
int num_parts; /* Number of parts loaded */

UF_initialize();

/* Check For An Active Part */

part_tag = UF_ASSEM_ask_work_part();

if ( part_tag == NULL_TAG )
{

/* Ask For A Part To Retrieve or Create */

nopart = 1;
while (nopart)
{
choice = uc1600("Retrieve/Create part*Enter name", prtnam, &idum);
if (choice < 3) { return; }
nopart=((choice != 1) && (choice != 4) && (prtnam[0] != 0)) ? 0 : 1;

/* Check if the named part already exists on disk */

status = uc4560(prtnam, PART);
if ( status == 0 )
{

/* Retrieve specified part */

status = UF_PART_open( prtnam, &part_tag, &load_status );

nopart = 0;
num_parts = load_status.n_parts;
if ( status != 0 )
{
report_error( status, "retrieving part", prtnam );
nopart = 1;
}
if ( num_parts > 0 )
{
int indx = 0;
while ( indx < num_parts )
{
report_error( load_status.statuses[indx],
"retrieving part",
load_status.file_names[indx] );
indx++;
}
UF_free_string_array( num_parts, load_status.file_names );
UF_free( load_status.statuses );
nopart = 1;
}
}

else if ( status == 1 )
{

/* Create specified part */

status = UF_PART_new(prtnam, UF_PART_ENGLISH, &part_tag );
report_error( status, "creating part", prtnam );
if ( status == 0 )
nopart = 0;
}
else
{
report_error( status, "checking part", prtnam );
}
}
}

/* We Now Have An Active Part */
/* Get Next Action Choice (This Section Loops) */

while (1)
{
choice = uc1603(title, 0, menu, 6);

/* Should always cancel out of the ufun dialog when the
* user selects cancel or back
*/
if (choice == 1 || choice == 2)
{
UF_terminate();
}

choice += -4;
defalt[0] = 0;
switch (choice) {
case 1: /* Create Points */
choice = uc1616("CREATE POINT", defalt, 0, point1);
while (choice > 4)
{
UF_CURVE_create_point ( point1 , &entid );
choice = uc1616("CREATE POINT", defalt, 0, point1);
}
break;

case 2: /* Create Lines */
choice = 5;
while (choice > 4)
{
UF_CURVE_line_t line_coords;

choice = uc1616(linmsg[0], defalt, 0,
line_coords.start_point );
if (choice > 4)
{
choice = uc1616(linmsg[1], defalt, 0,
line_coords.end_point );
if (choice > 4)
UF_CURVE_create_line ( &line_coords , &entid );
if (choice == 1)
choice = 5;
}
}
break;

case 3: /* Create Arcs/Circles */
pos_returned = 1;
while (pos_returned)
{
arcmsg[13] = '1';
choice = uc1616(arcmsg, defalt, 0, point1);
pos_returned = (choice > 4) ? 1 : 0;
if (choice > 4)
do {
arcmsg[13] = '2';
choice = uc1616(arcmsg, defalt, 0, point2);
if (choice > 4)
{
arcmsg[13] = '3';
choice = uc1616(arcmsg, defalt, 0, point3);
rejected = (choice == 1) ? 1 : 0;
if (choice > 4)
FTN(uf5063)(&mode,point1,point2,point3,&entid);
}
else /* check work */
{
rejected = (choice == 1) ? 0 : 1;
pos_returned = (choice == 1) ? 1 : 0;
}
} while (rejected);
}
break;

case 4: /* Delete Last Entity Created */
if (entid != 0)
UF_OBJ_delete_object(entid);
entid = 0;
break;

case 5: /* Change Arc Mode */
choice = uc1603("CHOOSE ARC MODE", mode, mdmenu, 2);
if (choice > 4)
mode = choice - 4;
break;

default: UF_terminate ( );
return;
}
}
}

/*----------------------------------------------------------------------------*/

static void report_error( int error_code, char *msg_text, char *part_name )
{
if ( error_code != 0 )
{
char error_message[133];
char local_string[300];

UF_get_fail_message( error_code, error_message );

sprintf(local_string,"Error %d %s: %s - %s",
error_code, msg_text, part_name, error_message );

uc1601( local_string, WAIT );
}
}


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