Using dbms_output.get_line in VB.NET - vb.net

Question

I have some stored procedures to execute that use dbms_output.put_line() to put data into the output buffer.
I know I need to use dbms_output.get_line(:line, :status) to retrieve that output.
I'm using System.Data.OracleClient to avoid headaches with Oracle deployment.
So what am I doing wrong with the code below?
Dim cmdSproc As OracleCommand = cnOracle.CreateCommand()
Dim strOracle As New OracleString()
Dim opaLine As New OracleParameter("lineOut", OracleType.VarChar, 255)
opaLine.Direction = ParameterDirection.Output
Dim opaStatus As New OracleParameter("status", 0)
cmdSproc.CommandText = "begin dbms_output.get_line(:lineOut,:status); end;"
cmdSproc.Parameters.Add(opaLine)
cmdSproc.Parameters.Add(opaStatus)
Dim strOutput As String = ""
strOracle = "0"
Try
While strOracle = "0"
cmdSproc.ExecuteOracleNonQuery(strOracle)
strOutput = strOutput & strOracle.ToString() & vbNewLine
End While
Catch ex As Exception
MsgBox(ex.Message)
End Try

Answer 1

In vb.net the code format SKINDER friend is as follows... thnxs for sharing
Sub _showDbms()
Dim c As New OracleCommand()
c.Connection = frmMain._cnn
With c
.CommandType = CommandType.Text
.CommandText = "begin dbms_output.get_line(:line, :status); end;"
.Parameters.Add(New OracleParameter("line", OracleDbType.Varchar2)).Size = 32000
.Parameters("line").Direction = ParameterDirection.Output
.Parameters.Add(New OracleParameter("status", OracleDbType.Int32))
.Parameters("status").Direction = ParameterDirection.Output
End With
c.ExecuteNonQuery()
If c.Parameters("line").Value IsNot DBNull.Value Then
MsgBox(c.Parameters("line").Value.ToString)
End If
End Sub

Answer 2

Here's how I got it to work: (found it here)
Dim cmdGetOutput As New OracleCommand("declare " & _
" l_line varchar2(255); " & _
" l_done number; " & _
" l_buffer long; " & _
"begin " & _
" loop " & _
" exit when length(l_buffer)+255 > :maxbytes OR l_done =1; " & _
" dbms_output.get_line( l_line, l_done ); " & _
" l_buffer := l_buffer || l_line || chr(10); " & _
" end loop; " & _
" :done := l_done; " & _
" :buffer := l_buffer; " & _
"end;", cnOracle)
cmdGetOutput.Parameters.Add("maxbytes", OracleType.Int16)
cmdGetOutput.Parameters("maxbytes").Value = 32000
cmdGetOutput.Parameters.Add("done", OracleType.Int16)
cmdGetOutput.Parameters("done").Direction = ParameterDirection.Output
cmdGetOutput.Parameters.Add("buffer", OracleType.LongVarChar, 32000)
cmdGetOutput.Parameters("buffer").Direction = ParameterDirection.Output
Dim strOutput As String = ""
Dim intStatus As Integer = 0
Try
While True
cmdGetOutput.ExecuteNonQuery()
strOutput = strOutput & cmdGetOutput.Parameters("buffer").Value & vbNewLine
If cmdGetOutput.Parameters("done").Value = 1 Then
Exit While
End If
End While
Catch ex As Exception
MsgBox(ex.Message)
Finally
MsgBox(strOutput)
cnOracle.Close()
End Try

Answer 3

In C# I am using the next method:
private string GetDbmsOutputLine()
{
OracleCommand command = new OracleCommand
{
Connection = <connection>,
CommandText = "begin dbms_output.get_line(:line, :status); end;",
CommandType = CommandType.Text
};
OracleParameter lineParameter = new OracleParameter("line",
OracleType.VarChar);
lineParameter.Size = 32000;
lineParameter.Direction = ParameterDirection.Output;
command.Parameters.Add(lineParameter);
OracleParameter statusParameter = new OracleParameter("status",
OracleType.Int32);
statusParameter.Direction = ParameterDirection.Output;
command.Parameters.Add(statusParameter);
command.ExecuteNonQuery();
if (command.Parameters["line"].Value is DBNull)
return null;
string line = command.Parameters["line"].Value as string;
return line;
}