Webutil Problem - Client_Win_API_Environment function

Question

Hiya
I am facing a peculiar problem.
I want to use Webutil's functions in my form. I am calling client_Win_API_Environment.Get_Windows_Version function in my
form. But I am getting "FRM-40734: Internal Error: PL/SQL error occurred" message. However if I call Webutil_ClientInfo.Get_User_Name
function, it works fine. It returns the Windows user name.
I tried calling client_Win_API_Environment.Get_Windows_Version function in my same application's
login form. Funny enough it works perfectly well. It does return Windows Version.
There's no error in Java console also. It is downloading frmall_jinit.jar, frmwebutil.jar & jacob.jar files.
I have attached Webutil.pll pl/sql library and subclassed Webutil's object group from Webutil's Object Library
to both forms.
So my problem is client_Win_API_Environment.Get_Windows_Version function doesn't work in the form in which I want to use it.
I tried changing the order of the WEBUTIL data block under the Data Blocks node and WEBUTIL_CANVAS canvas under the
Canvas node in Object Navigator. But it didn't make any difference either.
When I go into WEBUITL_CANVAS in layout editor, it does show all 8 Java Beans present under WEBUTIL data block.
I am using Forms 10g version : 10.1.2.0.2 and Oracle JInitiator version : 1.3.1.22
Any idea about this problem ?
Cheers
Mayur

Answer 1

Problem Resolved !!
I finally managed to sort this problem out.
The reason for Client_Win_API_Environment package's functions were giving error was that I was using Client_Win_API_Environment and Client_OLE2 package's functions in my forms' startup triggers such as Pre-Form, When-New-Forms-Instance and When-New-Block-Instance triggers.
As a result what happening was that as soon as the Forms encountered Client_Win_API_Environment's functions, it was not executing the subsequent statements after the Client_Win_API_Environment's functions. It was immediately coming out from that procedure/function/trigger. Further during the execution, if it again encountered Client_Win_API_Environment function used elsewhere in the form, it was throwing the error "FRM-40734: Internal Error: PL/SQL error occurred".
To overcome this problem, I created timers with a duration of 1 second (1000 ms)in these startup triggers and in When-Timer-Expired trigger, pasted the code of these start up triggers. And it worked !!
Although this has been clearly documented by Oracle in its "Webutil User's Guide" http://www.oracle.com/technology/products/forms/htdocs/webutil/web_util.pdf
and even I had gone through this document before I embarked on migrating my Forms 6i to Forms 10g, I overlooked the code of these startup triggers in my forms when debugging for this problem.
It took quite a lot amount of my precious time (more than 1 day) to fix this problem, it taught me a valuable lesson.
Cheers
Mayur