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函数说明：
查询指定的表达式是否是几何表达。

函数参数：
第1个参数为输入：
exp_tag代表参数变量，tag_t 为输入参数类型，表达的标签来查询

第2个参数为输出：
flag代表参数变量，logical * 为输出参数类型，如果此表达式是几何表达

UF_MODL_is_geometric_expression函数实例代码演示：
下面的代码创建两个街区，创建一个距离表达两个固体，然后通过在部分的所有表达式循环之间并输出列表窗口中的几何表达。
[quote]
#include <unidefs.h>
#include <stdio.h>
#include <uf.h>
#include <uf_modl.h>
#include <uf_ui.h>
#include <uf_defs.h>
#include <uf_obj.h>
#include <uf_gexp.h>
#include <uf_object_types.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)
{
double block_orig[3] = {0.0,0.0,0.0};
double block_orig1[3] = {5.0,5.0,5.0};
char *block_len[3] = {"1","2","3"};
tag_t blk_obj,blk_obj1;
int ifail=0;
char *string;
tag_t *exps;
int number_of_exps=0,i=0;
char buf[UF_UI_MAX_STRING_LEN+1];
char err_msg[MAX_LINE_SIZE+1];
tag_t part, feat_tag, exp_tag, solid, solid_body[2];
int type, subtype;

UF_CALL(UF_MODL_create_block1(UF_NULLSIGN,block_orig,
block_len,&blk_obj));
UF_CALL(UF_MODL_create_block1(UF_NULLSIGN,block_orig1,
block_len,&blk_obj1));
UF_CALL(UF_UI_open_listing_window());
if((part=UF_PART_ask_display_part()) == NULL_TAG)
{
UF_UI_write_listing_window("Failed to get part tag\n");
return;
}
solid=NULL_TAG;
while (i < 2)
{
type=UF_solid_type;
UF_OBJ_cycle_objs_in_part( part, type, &solid );
UF_OBJ_ask_type_and_subtype(solid, &type, &subtype);
if (subtype == UF_solid_body_subtype)
solid_body[i++]=solid;
}
UF_CALL(UF_GEXP_create_distance(solid_body[0], NULL_TAG,
solid_body[1], NULL_TAG, &feat_tag, &exp_tag));
ifail=UF_MODL_ask_exps_of_part(part,&number_of_exps,&exps);
if(ifail)
{
UF_get_fail_message(ifail,err_msg);
sprintf(buf,"Error: %s\n", err_msg);
UF_UI_write_listing_window(buf);
}
sprintf(buf,"number_of_exps=%d\n",number_of_exps);
UF_UI_write_listing_window(buf);
UF_UI_write_listing_window("Asking for geometric expressions\n");
for(i=0;i<number_of_exps;i++)
{
logical flag;
ifail=UF_MODL_is_geometric_expression(exps[i],&flag);
if (ifail)
{
UF_get_fail_message(ifail, err_msg);
sprintf(buf, "Error: %s\n", err_msg);
UF_UI_write_listing_window(buf);
}
if (flag == TRUE)
{
ifail=UF_MODL_ask_exp_tag_string(exps[i],&string);
if(ifail)
{
UF_get_fail_message(ifail, err_msg);
sprintf(buf, "Error: %s\n", err_msg);
UF_UI_write_listing_window(buf);
}
sprintf(buf,"Geometric expression %s\n",string);
UF_UI_write_listing_window(buf);
UF_free(string);
}
}
UF_free(exps);
}
/*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);
}

[/quote]