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函数说明：
释放用于存储GD＆T符号信息的存储器。

函数参数：
第1个参数为输入：
gdt_symbol_info代表参数变量，UF_DRF_gdt_symbol_info_t * * 为输入参数类型，GD＆T符号信息（参见UF DRF types.h中）

UF_DRF_free_gdtsymbol函数实例代码演示：
在下面的示例中的代码查询GD＆T符号信息。
[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 gdt_symbol_tag = NULL_TAG;
double gdt_symbol_origin[ 3 ];
UF_DRF_gdt_symbol_info_t *gdt_symbol_info;
/* 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,
&gdt_symbol_tag );
while( !ifail && gdt_symbol_tag )
{
ifail = UF_OBJ_ask_type_and_subtype( gdt_symbol_tag, &type,
&subtype );
/* Test type for the GD&T Symbol. */
if( !ifail && subtype == UF_draft_fpt_subtype )
{
/* Retrieve GD&T Symbol information. */
ifail = UF_DRF_ask_gdt_symbol_info (
gdt_symbol_tag,
&gdt_symbol_origin[0],
&gdt_symbol_info);
/* free text string first */
ifail = UF_DRF_free_gdtsymbol( &gdt_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,
&gdt_symbol_tag );
}
printf( "UF_DRF_ask_gdt_symbol_info sample " );
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]