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LiveCode Crashing
Posted: Sun May 13, 2012 8:05 am
by NigelS
I'm a little frustrated as my application keeps crashing. I have two cards, the one picks a file and the other just displays it. I've attached some screen shots. Iv'e had a few issues with the following command and was wondering if this is not a problem within live code itself.
Code: Select all
on preOpenCard
put the cMessageTitle of this stack into tMessageTitle
put tMessageTitle into field "MessageTitle"
put url("file:" & tMessageTitle ) into tMessageFileContents
set the rtftext of fld "theMesage" to tMessageFileContenrs
end preOpenCard
specifically these two lines
Code: Select all
put url("file:" & tMessageTitle ) into tMessageFileContents
set the rtftext of fld "theMesage" to tMessageFileContents
Has anyone had problems with this at all? And if so, is there a work around.
Re: LiveCode Crashing
Posted: Sun May 13, 2012 9:07 am
by NigelS
mmm can't get the screens attached for some reason
Re: LiveCode Crashing
Posted: Sun May 13, 2012 11:48 am
by Klaus
Hi Nigel,
of course LiveCode should NOT crash in any case!
Is this on Mac or Windows?
Are you sure that the file is where you exspect it?
Your snytax requires that the file is in the current defaultfolder, whereever that may be!
Try this:
Code: Select all
...
if there is a file tMessageTitle then
put url("file:" & tMessageTitle ) into tMessageFileContents
set the rtftext of fld "theMesage" to tMessageFileContenrs
else
put "No file!" into fld "theMesage"
### Check here where you really are:
answer the directory
end if
...
OK, so the question is where is the current defaultfolder?
Or where do you exspect it to be?
You should construct absolute pathnames whenever possible,
especially when you don't know your current relative "position".
Best
Klaus
Re: LiveCode Crashing
Posted: Tue May 15, 2012 4:02 am
by NigelS
It's on a MAc. Been playing around a little more and have found the sequence of events that leads to the crash. It's to do with the way the Stack open the second time around. The data is kept within the properties when executing the application. The directory location losses its place. I can accept that it's the way I've coded it, but what does surprise me is that there is no exception thrown by the engine.
O! well, we live and learn.
Re: LiveCode Crashing
Posted: Tue May 15, 2012 8:52 am
by Klaus
Hi Nigel,
NigelS wrote:The data is kept within the properties when executing the application.
You mean custom properties?
NigelS wrote:The directory location losses its place.
Sorry, I have noi idea what you are talking about, could you please explain?
Best
Klaus
Re: LiveCode Crashing
Posted: Tue May 15, 2012 5:18 pm
by NigelS
Hi Klaus
When data (text) is entered into a field and you close the application and start it again, the data (text) is still in the property. I have a field that contains the directory location of where the RTF files are.
The following code is excecuted on pressing a button (obvious) and "defaultFolder" is set.
Code: Select all
on mouseUp
ClearVariables
local tFolder
answer folder "Please choose folder"
put it into tFolder
if there is no folder tFolder then exit mouseUp
put tFolder into field "Folder"
put listFiles(currentFolder()) into field "Result"
set the defaultFolder to "Folder"
focus on fld "Result"
end mouseUp
Having done that then the user selects a RTF file that is shown in a list. The following code is executed.
Code: Select all
on mouseUp
ActivatePreviewMessage
end mouseUp
Code: Select all
command ActivatePreviewMessage
get the selectedText of field "Result"
put it into tMessageTitle
put url("file:" & tMessageTitle ) into tMessageFileContents
set the rtftext of fld "TheMessage" to tMessageFileContents
end ActivatePreviewMessage
My problem seems to stems from the "defaultfolder" property. I made an assumption which was incorrect. The manual does make a mention of a "gotcha" and that "gotcha" got me.
Anyway, thanks for your assistance.
Nigel
Re: LiveCode Crashing
Posted: Tue May 15, 2012 6:34 pm
by Klaus
Hi Nigel,
I guess this line caused the "hickup":
...
set the defaultFolder to "Folder"
...
doesn't make any sense and Liveocde did not like it, too
But again, try to avoid using/setting "the defaultfolder", there will always be a possibility to create any ABSOLUTE pathname!
AND you should really do some checks:
...
if the selectedText of field "Result" <> EMPTY then
### do your stuff
## otherwise you don't know what might happen!
...
When data (text) is entered into a field and you close the application and start it again, the data (text) is still in the property.
When you quit a standalone then NOTHING will be left in the field or property!??
Or am I misunderstanding you here?
Best
Klaus
Re: LiveCode Crashing
Posted: Fri May 18, 2012 4:03 am
by NigelS
Your right on all point, and, Yea! I should do more checks.
