Libpq - multibyte character support

Hi all,

My question is does PgSQL libpq functions support multibyte characters...if
not then is there a way to provide multibyte data to Postgres using libpq
functions. The other question is does Postgres support Chinese
characters....if I insert chinese characters into a table, when I read, will
I get the same chinese characters. Please help me out in this regard.

I have created a database with UNICODE support which has a table
GSNames(Gsname varchar(40), status int, errorcode int)
I tried to insert into this table from a simple C program using libpq
functions....but it gives error as libpq does not support wchar datatypes.
Here is the code -

int main()
{
// wchar_t szQuery[255];
char szQuery[255];

PGconn *DBCon;
PGresult *DBResult;

//Connect to the database with default settings
DBCon = PQsetdbLogin(NULL, NULL, NULL, NULL, "test1", "postgres",
""); //test1 is database created with UNICODE encoding

//check if there is any error in connecting to the database
if(PQstatus(DBCon) == CONNECTION_BAD)
{
fprintf(stderr,"\nGetAttributeInfo(): Connection to database
failed.");
fprintf(stderr,"\nGetAttributeInfo(): %s",
PQerrorMessage(DBCon));
return ERROR_DB_CON;
}
else
{
fprintf(stderr,"\nGetAttributeInfo(): Connection to database
successful.");
}

//form the DELETE command as character buffer.
//swprintf(szQuery,500,L"INSERT INTO gsnames values('×¢²á',2,2)");
sprintf(szQuery,"INSERT INTO gsnames values('×¢²á',2,2)");

//execute the command.
DBResult = PQexec(DBCon, (char *)szQuery);

//check for any errors in executing the query.
if(PQresultStatus(DBResult) != PGRES_COMMAND_OK)
{
fprintf(stderr,"\nGetAttributeInfo(): %s",
PQresultErrorMessage(DBResult));
PQclear(DBResult);
PQfinish(DBCon);
return ERROR_DB_EXEC;
}
else
{
fprintf(stderr,"\nDBInsertPointAttribute(): Insertion
successful. No. of rows affected = %d.", PQntuples(DBResult));
}

PQclear(DBResult);
PQfinish(DBCon);

return 0;
}

The problem is I am not able to pass multibyte characters to postgres.
Please help.....Thanks in advance.

Regs,
Pradeep