Inserting data a UDT in binary format using LIBPQ

Dear PostgreSQL Gurus,

I need your help. I have created a UDT that has both text
and binary functions (func_IN and func_recv) to recieve
text and binary data. I have also added some other functions
for new type that takes binary and text input. Everything
seems to be working fine if I am using psql. I can load and query
data. However, I cannot seem to insert data using LibPQ. It calls
func_recv functions on the server side but doesn't get the
data it expects. I have created the type be of variable length
and am 'detoasting' the data inside recv function to make sure
data input is properly parsed.

Included below is a snippet of code cut and places from various
functions that I am using to insert. On server side when I try to print
input data size and values I get incorrect results.

I didn't find much documentation but thought this should have
worked. Please point any thing that I didn't do right. Also, another
function that takes binary input in the very same manner and can be
invoked at sql level seems to work just fine.

Thanks,
Brijesh

Client side code:
**********************************************
sprintf(m_psql," Insert into %s (UDTCOL) VALUES "
" ($1)", TEST_TABLE);

m_paramTypes[0] = 50415; //OID for the new type from pg_type table
m_paramValues[0] = "A text string to test the data input";
m_paramSizes[0] = strlen(m_paramValues[0]);
m_paramFormats[0] = PG_BINARY_FORMAT;

m_res = PQprepare(m_pgconn, m_stmtName,m_psql, 1,m_paramTypes);
if (PQresultStatus(m_res) != PGRES_COMMAND_OK)
{
....
....
}

m_res = PQexecPrepared(m_pgconn,
m_stmtName,
1,
m_paramValues,
(const int *) m_paramSizes,
(const int *) m_paramFormats,
m_resFormat);

if (PQresultStatus(m_res) != PGRES_COMMAND_OK &&
PQresultStatus(m_res) != PGRES_TUPLES_OK)
{

}

Server side code:
**********************************************

Datum func_Recv(PG_FUNCTION_ARGS)
{
FUNC_BINARY_FORMAT *input
= (FUNC_BINARY_FORMAT *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));

elog(NOTICE," Binary DATA_LEN = %d\n",VARSIZE(input));
elog(NOTICE," Binary DATA CONTENT= %s\n",VARDATA(input));