Saving data in List Magic tables
cszasz at mac.com
Thu Aug 5 10:19:29 CDT 2010
What is the best location for an app to be installed on OSX?
cszasz at mac.com
On Aug 5, 2010, at 10:35 AM, Richard Gaskin [via Runtime Revolution] wrote:
> charles61 wrote:
> > I have a standalone consisting of a splash stack and an app stack. I have set
> > up a script that the user can insert some information into two tables - one
> > for students and one for adults. These tables are on two different cards in
> > my app stack.
> > I have been testing my standalone on Windows XP where it was installed in
> > the AllUsersAppData directory using an installer program. I tried the
> > following script for the card that has the student list:
> > on closeCard
> > Save "School Report" as "\Documents and Settings\All Users\Application
> > Data"
> > end closeCard
> > But this does not save the data in the two tables! Any suggestions would be
> > greatly appreciated!
> When the unexpected happens, it's time for error-checking. One of the
> challenges of crafting apps is that when you're being diligent only
> about half your code will actually do what your app does, and the other
> half will be all the stuff you add to account for when things go wrong. :)
> In Rev, most error conditions are reported in "the result" immediately
> after a command fails, and for I/O and other system-related tasks you
> may find an additional OS-supplied error code using the sysError function.
> So to better understand what's happening there you may try adding that
> to your script.
> Also, by hard-wiring your paths they won't work on international systems
> where the spelling may differ, and may not survive changes to the OS if
> MS changes the names of those folders in a future version.
> The solution for that is Rev's specialFolderPath function. Rev provides
> a variety of constants you can pass to that function to get the path,
> and pretty much all OS constants provided by the OS vendor can be used
> as well -- Ken Ray's put together this comprehensive list:
> While Rev doesn't include a built-in constant for that, looking at Ken's
> list you can use the OS constant instead, which is "35".
> If you want that to be cross-platform you can use Ken's list to get the
> Application Support constant for OS X, but for now here's your code
> modified with specialFolderPath and including the error check which will
> hopefully help diagnose the issue.
> A ha! As I was rewriting your code I noticed that you're specifying
> only the folder and not the file name, so effectively you're asking Rev
> to try to turn the stack into a folder, which of course it can't do.
> The fix for that is included in this revision:
> on closeCard
> Save "School Report" as (specialFolderPath(35)&"/School Report.rev")
> if the result is not empty then
> answer error "An error occurred while saving the report: "&cr&\
> the result & "("& sysError() &")"
> end if
> end closeCard
> Note that the ".rev" extension can be changed to anything else you feel
> might be appropriate for your app. Rev opens stacks based on their
> internal stucture, and a standalone is not required to use the .rev file
> name extension to work with stack files, allowing you to define your own
> document types.
> If you want to use a custom file name extension you may want to check
> <http://filext.com/> to see if another program may be using it. That's
> not a comprehensive list (Microsoft doesn't maintain such an index), but
> it'll at least help avoid some of the more obvious conflicts.
> Richard Gaskin
> Fourth World
> Rev training and consulting: http://www.fourthworld.com
> Webzine for Rev developers: http://www.revjournal.com
> revJournal blog: http://revjournal.com/blog.irv
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