how to call stored procedures using ADO/WFC?

In my J++ application ,i want to call a stored procedure in SQL server and get the output/return value using ADO/WFC,i tried several times using Connection and Command object but failed,can you help me? thank you!
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What errors are you getting and for what data types? Have you tried something like this simple example?

Sql is:

   create proc SimpleSQL

     @i1  int output,
      @i2  int output,
       @i3  int output,
        @i4  int output

   select @i1 = 555,
          @i2 = 666,
          @i3 = 777,
          @i4 = 888

    return 999

Java is:

  CallableStatement stmt =
    conn.prepareCall(" { ? = call simpleSQL(?, ?, ?, ?) }");

  stmt.registerOutParameter(1, Types.SMALLINT);

    stmt.setInt(k,k * 100);
    stmt.registerOutParameter(k, Types.INTEGER);

  int count = stmt.executeUpdate();


Then use stmt.getInt(<parameterIndex>) to get the various integer data after this...

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