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函数说明：
释放标签信息存储。

函数参数：
第1个参数为输入：
label_info代表参数变量，UF_DRF_label_info_t * * 为输入参数类型，标签信息（见UF_DRF_label_info_p_t）

UF_DRF_free_label函数实例代码演示：
在以下示例代码查询标签信息。
[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 label_tag = NULL_TAG;
double label_origin[ 3 ];
UF_DRF_label_info_t *label_info;
/* Initialize User Function. */
ifail = UF_initialize();
/* Find the tag to a dimension entity. */
ifail = UF_OBJ_cycle_objs_in_part( UF_ASSEM_ask_work_part(),
UF_drafting_entity_type,
&label_tag );
/* Find the tag of an ordinate dimension. */
while( !ifail && label_tag )
{
ifail = UF_OBJ_ask_type_and_subtype( label_tag, &type,
&subtype );
/* Test type for the label. */
if( !ifail && subtype == UF_draft_label_subtype )
{
/* Retrieve the label information. */
ifail = UF_DRF_ask_label_info ( label_tag,
&label_origin[ 0 ],
&label_info );
/* Free label information memory. */
if( !ifail )
UF_DRF_free_label( &label_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,
&label_tag );
}
printf( "UF_DRF_ask_label_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]