Using ByRef Parameters in MTS objects

[RedDiver]

Hi,

I've built an ASP page which uses an activeX DLL to retrieve data from a database.

The function which retrieves the data (in side the DLL) loocs like :

Public function GetRS(ByVal ID as integer, Optional ByRef Hresult as Variant) as ADODB.Recordset

The function builds a recordset and uses the Hresult variant to return Error Codes.

I developed that DLL as a normal DLL, It worked grate the recordset was created and the Hresult returned Errors as planed, so I happily moved to the 2nd stage which was to place the DLL in a MTS.

When I placed the DLL in the MTS Hresult stopped working. My ASP received the recordset correctly but did not get the Hresult values (Hresult is always empty).

Way Is that ?

Thanks

Erez

[André]

Hi there,

This is an extract of an article on best practices for building VB COM objects to be used with ASP:

http://support.microsoft.com/support.../Q243/5/48.ASP

ByRef parameters should be passed as Variant while ByVal parameters can be specific data types. For additional information.

Search for:Passing Parameters By Reference to a VB COM Object


Do not register your component with MTS unless you need transactions. ObjectContext can be expensive in terms of performance.


cheers,
André

[André]

Hmmmm, Hi again, I see from your code line that it is a function. The function will only return a recordset, no Hresult!, if you want to put a value in Hresult, maybe you need a Public Sub GetRS(ByVal ID as integer, Optional ByRef Hresult as Variant, RS as ADODB.Recordset )

André

[RedDiver]

Hi,

Ok, At last it works and there are our conclusions from our ordeal with IIs and MTS :

1) Use ADO 2.1 and to ADO 2.0

2) Use "CreateObject" insted of <OBJECT>

3) dont use function AI public function <name>(<input params>) as <return val>
Create all your objects in the IIS and send them "By Ref" to the MTS
object. AI public sub <name>(<input Parameters>, <Output Parameters>)

Have fun

Erez