I am trying to call a Visual Foxpro DLL from SQL Server and I am getting errors.

The VFP OLEPUBLIC Class definition is as follows
-------------------------------------------------------------------
Define Class UpdateFox AS custom OLEPUBLIC
lcInputString = SPACE(25)

Function SetInputString
PARAMETERS lcInputString
This.lcInputString = lcInputString
EndFunc

Function GetName
RETURN This.lcInputString
EndFunc

Function Updating
lcInputString = This.lcInputString
lcInputString = STRTRAN(lcInputString, "+", " " ) &&Create Spaces from + signs
lcFOXTable = SUBSTR(lcInputString,1,AT("@",lcInputString,1)-1)
lcSQLString1 = SUBSTR(lcInputString, AT("@",lcInputString,1)+1, (AT("@",lcInputString,2)-AT("@",lcInputString,1))-1)
lcSQLString2 = SUBSTR(lcInputString, AT("@",lcInputString,2)+1, (AT("@",lcInputString,3)-AT("@",lcInputString,2))-1)
lcSQLString3 = SUBSTR(lcInputString, AT("@",lcInputString,3)+1, (AT("@",lcInputString,4)-AT("@",lcInputString,3))-1)
lcFOXPath = SUBSTR(lcInputString, AT("@",lcInputString,4)+1)

CLOSE DATA ALL
USE (lcFOXPath+lcFoxTable) IN 0 SHARED ALIAS nad

lcSQLString = lcSQLString1 + lcSQLString2 + lcSQLString3
&lcSQLString

CLOSE DATA ALL
EndFunc
EndDefine
------------------------------------------------------------------

The following code is executed in the SQL Query Window as a batch (from the master database):
------------------------------------------------------------------
declare @hr int
declare @loSteve int
exec sp_oaCreate 'Steve.UpdateFox', @loSteve output
print @losteve
exec @hr = sp_oaMethod @loSteve, 'SetInputString','nad@update+nad@+set+name=strtran(name,[x],[+])+where+id=[OAK4753]@+@\\jf_lon_srv00\genesis\foxpro2\data\'
print @hr
IF @hr <> 0
BEGIN
EXEC sp_oageterrorinfo @losteve
RETURN
END
-------------------------------------------------------------------

The output received is as follows:
-------------------------------------------------------------------
14367712
-2147211483
[Microsoft][ODBC SQL Server Driver]Protocol error in TDS stream
[Microsoft][ODBC SQL Server Driver]Function sequence error
-------------------------------------------------------------------

What does the Protocol error in TDS stream imply?
Does anyone have any ideas how to implement a VFP DLL in SQL Server 7.0.

I have tried building the DLL both single threaded and multi threaded and receive the same error message.

When I use CREATEOBJECT("Steve.UpdateFox") in VFP, I can run all the updates required, so it is something to do with the way SQL is accessing the DLL.

The DLL is registered and the SQL Server is using a Domain account with Administrator permissions on both the local machine and the domain.

Any help would be greatly appreciated.

Cheers
Steve Lea