Re: Regional settings cause runtime crash

Tech-Archive recommends: Fix windows errors by optimizing your registry

"Colmag" <Colmag@xxxxxxxxxxxxxxxxxxxxxxxxx> schrieb 
Marina,

Thanks for the suggestion.  It seems I'm doing something dodgy in
converting variable types.

Because there are so many places where people have restricted access
rights, I've avoided writing anything to the registry.  To store
application settings such as window positions, I write a text file
containing these settings when the app closes, and read the config
file when the app starts.

I'm declaring a variable as a string which equals a line from the
text file and then applying that to my application.  e.g:

Dim MainTop As String = streamtoread.ReadLine
Me.top = MainTop

The main problem seems to be that you don't use Option Strict. If you used it you would be aware of all conversions taking place.

With appropriate regional settings (decimal separator = .) .net
converts the string to an integer no problem, but as soon as I
change the regional setting to something like a comma, the
conversion no longer works.

Are you sure at this line? I haven't seen an integer using a decimal separator, ever. ;-) How do you /write/ the line into the file?


Whenever you use the text representation of a value you must be aware of the format being used. Internally, one should store all values in it's native format, i.e. date values in DateTime variables etc. If you convert a value from it's native format to string or vice versa, the string format must be taken into account. To store and read application settings, you should use a fixed format. You can use the InvariantCulture to do this. Your application will run independent from the regional settings of the machine where it is running on. To present data to the user, use the regional settings that are usually used automatically used if you use ToString or Parse without additional formatting information.




Armin 

.

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