How to call oracle stored function from visual basic

Dear experts,
I am trying to call oracle stored function from vb6.

Here is oracle function code:

         current_date tbl_message.FLD_CREATE_DATE%TYPE
return varchar is
         num number;
         id varchar(13);
         today_date varchar(8);
         cur_date varchar(8);
         temp varchar(20);
         cursor runnum is
                       select to_char(fld_date,'YYYYMMDD')
                    from tbl_runnum
                    where to_char(fld_date,'YYYYMMDD') = to_char(current_date,'YYYYMMDD');
       open runnum;
       fetch runnum into today_date;
       if runnum%found then
             select fld_num into num
            from tbl_runnum;
            update tbl_runnum
            set fld_num=num;
             update tbl_runnum
             set fld_date = to_date(temp,'MM/DD/YYYY'),
                    fld_num = num;
             today_date := cur_date;
       end if;
       close runnum;
       id:=today_date || lpad(to_char(num),5,'0');
       return id;

This is my vb code:

    Dim objConn As New ADODB.Connection
    Dim objCmd As ADODB.Command
    Dim parm As ADODB.Parameter
    Set objCmd = New ADODB.Command
    objCmd.CommandType = adCmdStoredProc
    objCmd.CommandText = "POSTMAN.GENERATE_NUM"
    Set parm = objCmd.CreateParameter("PARAM1", adDBDate, adParamInput, , Format(Date, "MM/DD/YYYY Hh:M:SS   AMPM"))
    objCmd.Parameters.Append parm
    Set parm = objCmd.CreateParameter("PARAM2", adVarChar, adParamOutput, 13, "")
    objCmd.Parameters.Append parm

    objConn.Open "dsn=dsnPostman;uid=postman;pwd=postman"
    objCmd.ActiveConnection = objConn

    Dim this As String
    this = objCmd.Parameters("PARAM2").Value
    MsgBox "result " & this

But when I run the code I got the following error:
[oracle][odbc][ora]ORA-06550: line 1, column 7:
PLS-00306:wrong number or types of arguments in call to 'GENERATE_NUM'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

Could anyone please show me the right way to call oracle stored function from vb?

Please help.

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This is the link to the complete MS Knowledge base link for interacting with Oracle from VB using ADO/ RDO. Hope this helps.

I think you have to specify whether your parameter is an "IN" or "OUT" parameter.
Try this as your function definition: (assuming you want to pass "current_date" into the function)

        current_date IN tbl_message.FLD_CREATE_DATE%TYPE

Not specifying this might explain why the error message says "wrong number or types of arguments in call to 'GENERATE_NUM'"
Good luck.
No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
I will leave the following recommendation for this question in the Cleanup topic area:

Answered leonstryker

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