Execute hidden filter with explicit target

Question

Hello,
I would know if it is possible execute, in automation filter, an hidden filter with explicit target. I would apply a modified hidden filter on all image open in photoshop,
at this moment I use PIUSelectByIndex to select an open document and after I execute hidden filter on selected image.
How could I execute directly hidden filter on the image without use PIUSelectByIndex?
I try something like:
func()
    sPSActionReference->Make(&reference);
    sPSActionReference->PutIndex(reference,classDocument,1); //1,2,3... and so on
    sPSActionDescriptor->Make(&descriptor);
    sPSActionDescriptor->PutReference(descriptor,keyNull,reference);
    // This code is copied by Automation Filter example
    sPSActionDescriptor->PutEnumerated(descriptor,keyCommand,typeCommand,command);
    sPSActionControl->StringIDToTypeID(HiddenUniqueString,&hiddenEventID);
    sPSActionControl->Play(&result,hiddenEventID, descriptor, plugInDialogSilent);
but it doesn't work, hidden is always applied on the active document.
Thanks,
Franco

Answer 1

I am not sure that i understand what you are asking for.
You could try to remember current layer in current document then sellect tha layer and documant that you need to work on, apply hidden filter and then return to current document or layer.
If you can not work on Backgground layer maybe you have not selected it.
truy something like:
SPErr SelectBG(/*your parameters go here*/void)
         SPErr error = kSPNoError;
               PIActionDescriptor result = NULL;
         PIActionDescriptor desc000006F8 = NULL;
               PIActionReference ref00000198 = NULL;
         error = sPSActionDescriptor->Make(&desc000006F8);
         if (error) goto returnError;
    error = sPSActionReference->Make(&ref00000198);
    if (error) goto returnError;
    error = sPSActionReference->PutProperty(ref00000198, classLayer, keyBackground);
    if (error) goto returnError;
    error = sPSActionDescriptor->PutReference(desc000006F8, keyNull, ref00000198);
    if (error) goto returnError;
    error = sPSActionControl->Play(&result, eventSelect, desc000006F8, plugInDialogSilent);
    if (error) goto returnError;
returnError:
     if (result != NULL) sPSActionDescriptor->Free(result);
     if (desc000006F8 != NULL) sPSActionDescriptor->Free(desc000006F8);
     if (ref00000198 != NULL) sPSActionReference->Free(ref00000198);
     return error;
That should put focus on background layer and you should be able to work on it.
Hope this helps.
Regards,
Momir