Webutil and Outlook - I get a WUO-714 and WUO-705 error

Question

Hi,
I have installed webutil and it loads fine an all. However, I have a problem with a Microsoft Outlook integration. I am simply trying open an Outlook mail item, which is then filled out with some data. Pressing the Send button is up to the user.
Everything works until the line "mailitem2 := CLIENT_OLE2.INVOKE_obj(MailItem,'Display');" is called. Here Forms reports back: "100501: non-Oracle exception" and the java console gives a WUO-714 and WUO-705. The problems seems to be the Display method. At that point, despite errors, I do have an open, visible mail item with the proper data filled in. (In this process I noticed that the final invoke_obj should happen after you write stuff into the To, Subject and Body of the mail, but that's besides the point.)
Any advice you can offer is welcome.
Sincerely,
Jesper Vad Kristensen
Aarhus, Denmark
--- Java console error codes --
Loading http://oiatst01.tdk.dk:7778/forms90/webutil/webutil.jar from JAR cache
Loading http://oiatst01.tdk.dk:7778/forms90/webutil/jacob.jar from JAR cache
Loading http://oiatst01.tdk.dk:7778/forms90/java/f90all_jinit.jar from JAR cache
RegisterWebUtil - Loading Webutil Version 1.0.2 Beta
2003-nov-17 09:42:50.624 ERROR>WUO-714 [OleFunctions.setExceptionValues()] Unable to get the last OLE Error details; Exception
null
2003-nov-17 09:42:50.634 ERROR>WUO-705 [OleFunctions.invoke_ret_obj()] Unable to invoke Method: Display; Exception
com.jacob.com.ComFailException: VariantChangeType failed
--- end ---
--- Form code ---
Declare
     OutlookApp      CLIENT_OLE2.OBJ_TYPE;
     Folders      CLIENT_OLE2.OBJ_TYPE;
     MailItem      CLIENT_OLE2.OBJ_TYPE;
     MailItem2      CLIENT_OLE2.OBJ_TYPE;
     OLEPARAM      CLIENT_OLE2.list_type;
     v_kundenummer     varchar2(12) := :v_engagement.konto;
     v_firstname      varchar2(50) := :legal_person.firstname;
     v_surname           varchar2(50) := :legal_person.surname;
     v_company_name      varchar2(50) := :legal_person.company_name;
     v_to                varchar2(50) := '[email protected]';
     v_cc                varchar2(50);
     v_body                varchar2(250) := 'Kundenummer'||' ' ||v_kundenummer||chr(10)||v_firstname||' '||v_surname||' '||v_company_name;
     v_bcc                varchar2(50);
     v_subject           varchar2(50) := 'Fakturakopi';
     v_duedate           varchar2(50);
     v_invoicetext      varchar2(400);
     v_user                varchar2(50):= user;
     v_faktura           varchar2(400);
BEGIN
     /* snip some string work to create Body contents */
     OutlookApp := CLIENT_OLE2.CREATE_OBJ('Outlook.Application');
     --Create a newMail Object
     OLEPARAM := CLIENT_OLE2.CREATE_ARGLIST;
     CLIENT_OLE2.ADD_ARG(OLEPARAM,0);
     MailItem := CLIENT_OLE2.INVOKE_OBJ(OutlookApp,'CreateItem',OLEPARAM);
     CLIENT_OLE2.DESTROY_ARGLIST(OLEPARAM);
     -- Show the new message box. - Dont do when mailing straight Through
     CLIENT_OLE2.set_property(MailItem,'To',v_to);
     CLIENT_OLE2.set_property(MailItem,'Subject',v_subject);
     CLIENT_OLE2.set_property(MailItem,'Body',v_body);
     mailitem2 := CLIENT_OLE2.INVOKE_obj(MailItem,'Display');
     CLIENT_OLE2.RELEASE_OBJ(MailItem);
     CLIENT_OLE2.RELEASE_OBJ(MailItem2);
     CLIENT_OLE2.RELEASE_OBJ(NameSpace);
     CLIENT_OLE2.RELEASE_OBJ(OutlookApp);
     /* snip some more */
     exception
     when others then
     message('other error: '||sqlerrm);
--- end ---

Answer 1

Both the Outlook type library and the M/S online documentation show that the display method on MailItem does not have a return type. try a simple INVOKE rather than INVOKE_OBJ