table can't be get and set, var_***Table functin is not invoked anyway

Hi,
I have a question to ask you.
In my mib2c-produced skeleton source files which are style of ucd-snmp, I can't get or set the node of Simple table. It always responds "1: node39param1.1 (nosuchobject) no such object". I find the table's get function "var_node39Table" is not invoked anyway. When I run "snmptable -v2c -c public 200.162.162.190 .1.3.6.1.4.1.19176.1.1.20.9.1.1.2.1", the agent always responds "Was that a table? SNMPv2-SMI::enterprises.19176.1.1.20.9.1.1.2.1". How can I resolve it?
My source code as follows: static long table_1 = 123;static long table_2 = 223;
static long table_3 = 323;
struct variable13 scomcenter_variables[] = {
.....
#define NODE39INDEX  11
    {NODE39INDEX, ASN_INTEGER, RWRITE, var_node39Table, 7,   {1, 1, 20, 9, 1, 1, 1}},
#define NODE39PARAM1  12
    {NODE39PARAM1, ASN_INTEGER, RWRITE, var_node39Table, 7,  {1, 1, 20, 9, 1, 1, 2}},
#define NODE39PARAM2  13
    {NODE39PARAM2, ASN_INTEGER, RWRITE, var_node39Table, 7,  {1, 1, 20, 9, 1, 1, 3}},
};
unsigned char  *
var_node39Table(struct variable *vp,
                oid * name,
                size_t *length,
                int exact, size_t *var_len, WriteMethod ** write_method)
{
    static long     long_ret;
    static u_long   ulong_ret;
    static unsigned char string[SPRINT_MAX_LEN];
    static oid      objid[MAX_OID_LEN];
    static struct counter64 c64;     printf("var_node39Table\n");
    if (header_simple_table
        (vp, name, length, exact, var_len, write_method, TABLE_SIZE)
        == MATCH_FAILED){
        printf("header_simple_table failed\n");
        return NULL;
     }
   printf("header_simple_table ok\n");
     
    switch (vp->magic) {
    case NODE39INDEX:
        *write_method = write_node39index;
        return (u_char *) &table_1;
    case NODE39PARAM1:
        *write_method = write_node39param1;
        return (u_char *)table_2;
    case NODE39PARAM2:
        *write_method = write_node39param2;
        return (u_char *) &table_3;
    default:
        ERROR_MSG("");
    }
    return NULL;
}

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