[jawsscripts] Re: An interesting scripting problem
- From: Steve Matzura <number6@xxxxxxxxxxxxxx>
- To: jawsscripts@xxxxxxxxxxxxx
- Date: Mon, 07 May 2012 12:09:46 -0400
Programmers--we're the best at making the rules, and the first at
breaking them! LOL!
On Sun, 6 May 2012 21:06:15 -0500, you wrote:
>Yes, I definitely need this insert+windows+f4 item.
>I made a cardinal rule, and beat myself over the head with it. Make sure
>your loops will terminate. Then, I promptly proceed to break the rule.
>
>----- Original Message -----
>From: "Andrew Hart" <ahart@xxxxxxxxxxxxx>
>To: <jawsscripts@xxxxxxxxxxxxx>
>Sent: Sunday, May 06, 2012 8:54 PM
>Subject: [jawsscripts] Re: An interesting scripting problem
>
>
>Awesome tip that about Insert+Windows+F4. I am always forgetting that
>and never thought to try it.
>
>Thanks heaps,
>Andrew.
>
>On 6/05/2012 7:30 PM, Doug Lee wrote:
>> My normal way to handle that, at least when looping through windows,
>> is to stop if the window handle I get back is null. In this script,
>> you can do that by changing the While line to read
>>
>> while x && hWin1
>>
>> This works because hWin1, when treated as a boolean value like that,
>> will return True if non-empty and False when empty; and
>> getNextWindow() returns null when it runs out of windows.
>>
>> If you do get stuck in an infinite loop in a modern JAWS version
>> though, you can escape it and shut down JAWS by typing
>> Insert+Windows+F4.
>>
>> On Sun, May 06, 2012 at 07:14:42PM -0400, Andrew Hart wrote:
>> Correct me if I am wrong, but the while loop in this code makes me
>> nervous as it seems rather dangerous. The only way in which it can
>> terminate is if a window with the desired control id is found.
>> If the loop runs out of sibling windows to search, hWin1 and hWin2 will
>> end up with the value 0, but x will never get set to False.
>> In that case, the script will continue looping for ever, thus hanging
>> JAWS.
>>
>> If the window is guaranteed to exist, this is ok, but it would be good
>> coding practice to include another loop termination condition as a
>> safety net in case the application decides to behave badly or a future
>> update to the application removes the guarantee that the window is
>> always in the expected place. The termination condition could be a
>> simple counter to prevent the while loop iterating more than some
>> limited number of times that is considered reasonable (e.g. 10 or 20
>> iterations would probably suffice).
>>
>> Btw, if anything were to go wrong and the script failed to locate a
>> window with the desired control id, the only way to recover from the
>> infinite loop would be to punch the off button on the machine. I have
>> managed to drop JAWS into infinite loops on numerous occasions (due to
>> an error in programming logic) and the result is not pretty and
>> definitely an occasion for slapping one's forehead and thinking "idiot!"
>> Every time I do this I feel like that bowl of petunias in Douglas
>> Adam's the Hitch-Hiker's Guide to the Galaxy: "Oh no, not again."
>>
>> Hth,
>> Andrew.
>>
>> On 6/05/2012 5:30 PM, Steve Matzura wrote:
>>> An interesting take. Problem is, if the window isn't there, what kind
>>> of error will I get back from the calling line?
>>>
>>> Anyway, I did solve the problem, and here's the script for it. Sorry
>>> about the bad line-wrapping.
>>>
>>> include "hjconst.jsh"
>>>
>>> Script FocusSearchList ()
>>>
>>> ; This script, attached to CTRL+Shift+L, ensures
>>> ; PC cursor is on a particular control before doing anything else.
>>>
>>> var handle hWin1, handle hWin2,
>>> int x
>>>
>>> let hWin1 = GetCurrentWindow ()
>>> if GetControlID (hWin1) != 1001
>>> then
>>> SayMessage (ot_jaws_message, "Place the PC Cursor on
>>> the search edit field before executing this script.", "PC Cursor to
>>> search field first.")
>>> return
>>> endif
>>>
>>> let hWin1 = GetParent(hWin1) ; Go up one level.
>>> let x = TRUE
>>>
>>> while x
>>>
>>> let hWin2 = GetNextWindow (hWin1) ; Go right one window.
>>> if GetControlID (hWin2) == 1019 ; Window not accessible via normal tab
>>> ; controls
>>> then
>>> SetFocus (hWin2) ; Force the PC Cursor to that window.
>>> let x = FALSE ; Terminate the while condition.
>>> else
>>> let hWin1 = hWin2
>>> ; Save the current window handle for the next go-round.
>>>
>>> Endif
>>>
>>> EndWhile
>>>
>>> ; Script should always find the window with control ID 1019 this way.
>>> ; Question: What value would hWin2 have if it got to the
>>> ;rightmost window and couldn't find the one with control ID 1019?
>>>
>>> EndScript
>>>
>>>
>>> On Sun, 6 May 2012 08:05:10 -0700, you wrote:
>>>
>>>> You can use the function IsWindowVisible()
>>>> That will tell you if it is present or visible rather.
>>>> John
>>>> -----Original Message-----
>>>> From: jawsscripts-bounce@xxxxxxxxxxxxx
>>>> [mailto:jawsscripts-bounce@xxxxxxxxxxxxx] On Behalf Of Steve Matzura
>>>> Sent: Sunday, May 06, 2012 7:34 AM
>>>> To: jawsscripts
>>>> Subject: [jawsscripts] An interesting scripting problem
>>>>
>>>> I'm scripting an application that has a window that's sometimes there,
>>>> sometimes not. The first order of business is to check if the window is
>>>> there, and if it is, set focus to it. I know the control ID of the
>>>> window,
>>>> 1019. I'm trying to use FindDescendantWindow with a start handle of 0 to
>>>> verify its existence. My script so far looks like this:
>>>>
>>>> Script ReadSearchStatus ()
>>>>
>>>> var handle hwin
>>>>
>>>> let hwin = FindDescendantWindow (0, 1019)
>>>>
>>>> if hwin > 0
>>>> then
>>>> Say ("search window present.", ot_jaws_message, false)
>>>>
>>>> ; Insert code to set focus to the window. Should I even bother ; with
>>>> this?
>>>> ; Should I just try setting focus and if it fails, assume the window's ;
>>>> not
>>>> present?
>>>>
>>>> else
>>>> Say ("search window is not present.", ot_jaws_message, false)
>>>>
>>>> endif
>>>>
>>>> EndScript
>>>>
>>>> The problem is, it always comes up saying the window is present, even
>>>> when
>>>> it's not.
>>>> __________o?=
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