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函数说明：
释放用于存储该ID的符号信息的存储器。

函数参数：
第1个参数为输入：
id_symbol_info代表参数变量，UF_DRF_id_symbol_info_t * * 为输入参数类型，ID符号信息（参见uf_drf_types.h）

UF_DRF_free_idsymbol函数实例代码演示：
在下面的示例中的代码查询ID符号信息，并使用后释放存储器。
[quote]
#include <stdio.h>
#include <uf.h>
#include <uf_assem.h>
#include <uf_defs.h>
#include <uf_drf.h>
#include <uf_obj.h>
#include <uf_object_types.h>
#include <uf_part.h>
void ufusr(char *param, int *retcod, int param_len)
{
char error_message[133] = "";
int ifail = 0;
int type, subtype;
tag_t id_symbol_tag = NULL_TAG;
double id_symbol_origin[ 3 ];
UF_DRF_id_symbol_type_t id_symbol_type;
UF_DRF_id_symbol_info_t *id_symbol_info = NULL;
/* Initialize User Function. */
ifail = UF_initialize();
/* Find the tag of a drafting entity. */
ifail = UF_OBJ_cycle_objs_in_part( UF_ASSEM_ask_work_part(),
UF_drafting_entity_type,
&id_symbol_tag );
while( !ifail && id_symbol_tag )
{
ifail = UF_OBJ_ask_type_and_subtype( id_symbol_tag, &type,
&subtype );
/* Test type for the GD&T Symbol. */
if( !ifail && subtype == UF_draft_id_symbol_subtype )
{
/* Retrieve ID Symbol information. */
ifail = UF_DRF_ask_id_symbol_info ( id_symbol_tag,
&id_symbol_type,
&id_symbol_origin[ 0 ],
&id_symbol_info );
/* free text string first */
ifail = UF_DRF_free_idsymbol( &id_symbol_info );
}
/* Find the tag of next drafting entity. */
if ( !ifail )
ifail = UF_OBJ_cycle_objs_in_part(
UF_ASSEM_ask_work_part(),
UF_drafting_entity_type,
&id_symbol_tag );
}
printf( "UF_DRF_free_idsymbol " );
if( ifail )
{
ifail = UF_get_fail_message( ifail, error_message );
printf( "fails.\nError is: %s\n", error_message );
}
else
printf( "is successful.\n" );
UF_terminate();
}

[/quote]