Get the return value from Stored Procedure

Hi,

I have a stored procedure (e.g. sp_get_num) and it returns a integer number using the following statement:

RETURN 0; -- for error flag

However, when I use the following coldfusion statement to get the return value, I encounter some problems.

<cfstoredproc procedure="sp_get_num" datasource="#application.ds#" returnCode="yes">

  <cfprocresult name="searchResults">

  </cfstoredproc>

Now, I can only get the result of #searchResults.RecordCount# correctly. But, I still do not have idea on getting the return value. How can I get the return value?