How to parse locale specific number strings

I have an application that needs to run in 20 different locales. One part of the app contains a dialog with a control where a number is entered. The number format can be n.n or n,n dependding on the locale.

How do I check the number string to insure it conforms to the locale, and how do I then convert it to a number?
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Call 'GetLocaleInfo()' and query for 'LOCALE_SDECIMAL' to get the decimal separator. See also ("Localized numeric editbox") for a complete example, you probably will be able to re-use a lot of that code.

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