Problem getting data from a stored procedure

Question

On the Oracle DB there's a stored proc defined like:
PROCEDURE pGetHashes ( iFrom IN NUMBER, iTo IN NUMBER, sHash1 OUT CHAR, sHash2 OUT CHAR );
When I call this procedure from within my app, I only get a value for the sHash2 parameter. The value of the sHash1 parameter is always null. (Running the same stored proc from sqldeveloper gives a result for both hash values.)
Underneath I have added the code which I use to call the stored proc. Does anybody see anything I might have done wrong?
int iFrom = 0;
int iTo = 1000;
using (IDbCommand command = dbConnection.CreateCommand())
OracleCommand orclCommand = command as OracleCommand;
orclCommand.CommandText = "pGetHashes";
orclCommand.CommandType = CommandType.StoredProcedure;
orclCommand.Parameters.Clear();
orclCommand.Parameters.Add("iFrom", OracleDbType.Int32, iFrom, ParameterDirection.Input);
orclCommand.Parameters.Add("iTo", OracleDbType.Int32, iTo, ParameterDirection.Input);
OracleParameter orclParam = new OracleParameter("sHash1", OracleDbType.Char, 100);
orclParam.Direction = ParameterDirection.Output;
orclCommand.Parameters.Add(orclParam);
orclParam = new OracleParameter("sHash2", OracleDbType.Char, 100);
orclParam.Direction = ParameterDirection.Output;
orclCommand.Parameters.Add(orclParam);
orclCommand.BindByName = true;
orclCommand.ExecuteNonQuery();
// after this the orclCommand.Parameters["sHash1"].Value is always null.
// the orclCommand.Parameters["sHash2"].Value has the correct value.
For extra documentation. Running the following PLSQL from within sqldeveloper results in both a value for Hash1 and Hash2:
SET SERVEROUTPUT ON;
DECLARE
sHash1 CHAR(67);
sHash2 CHAR(67);
nFrom NUMBER := 0;
nTo NUMBER := 1000;
BEGIN
pGetHashes( nFrom, nTo, sHash1, sHash2 );
dbms_output.put_line('Hash1: '|| sHash1);
dbms_output.put_line('Hash2: '|| sHash2);
END;
Thanks for any light you can shed on this problem.

Answer 1

I can only assume that something is "going wrong" inside your procedure that is resulting in NULL actually being returned, although I don't see any reason the code should be causing it.
Try the folllowing "pGetHashes2" procedure, and let me know if you see the same results with your code. It works fine for me anyway..
Greg
create or replace procedure pGetHashes2 (iFrom number, iTo number, sHash1 out char, sHash2 out char)
as
begin
shash1 := 'foo';
shash2 :='bar';
end;
using System;
using System.Data;
using Oracle.DataAccess.Client;
namespace otnpost
    class Program
        static void Main(string[] args)
            OracleConnection dbConnection = new OracleConnection("data source=orcl;user id=scott;password=tiger");
            dbConnection.Open();
            int iFrom = 0;
            int iTo = 1000;
            using (IDbCommand command = dbConnection.CreateCommand())
                OracleCommand orclCommand = command as OracleCommand;
                orclCommand.CommandText = "pGetHashes2";
                orclCommand.CommandType = CommandType.StoredProcedure;
                orclCommand.Parameters.Clear();
                orclCommand.Parameters.Add("iFrom", OracleDbType.Int32, iFrom, ParameterDirection.Input);
                orclCommand.Parameters.Add("iTo", OracleDbType.Int32, iTo, ParameterDirection.Input);
                OracleParameter orclParam = new OracleParameter("sHash1", OracleDbType.Char, 100);
                orclParam.Direction = ParameterDirection.Output;
                orclCommand.Parameters.Add(orclParam);
                orclParam = new OracleParameter("sHash2", OracleDbType.Char, 100);
                orclParam.Direction = ParameterDirection.Output;
                orclCommand.Parameters.Add(orclParam);
                orclCommand.BindByName = true;
                orclCommand.ExecuteNonQuery();
                // after this the orclCommand.Parameters["sHash1"].Value is always null.
                // the orclCommand.Parameters["sHash2"].Value has the correct value.
                Console.WriteLine(orclCommand.Parameters["sHash1"].Value);
                Console.WriteLine(orclCommand.Parameters["sHash2"].Value);
}OUTPUT
==========
foo
bar
Press any key to continue . . .