Question

I need to write a Delphi application that pulls entries up from various tables in a database, and different entries will be in different currencies. Thus, I need to show a different number of decimal places and a different currency character for every Currency data type ($, Pounds, Euros, etc) depending on the currency of the item I’ve loaded.

Is there a way to change the currency almost-globally, that is, for all Currency data shown in a form?

Answer 1

Even with the same currency, you may have to display values with a different format (separators for instance), so I would recommend that you associate a LOCALE instead of the currency only with your values.
You can use a simple Integer to hold the LCID (locale ID).
See the list here: http://msdn.microsoft.com/en-us/library/0h88fahh.aspx

Then to display the values, use something like:

function CurrFormatFromLCID(const AValue: Currency; const LCID: Integer = LOCALE_SYSTEM_DEFAULT): string; var   AFormatSettings: TFormatSettings; begin   GetLocaleFormatSettings(LCID, AFormatSettings);   Result := CurrToStrF(AValue, ffCurrency, AFormatSettings.CurrencyDecimals, AFormatSettings); end;  function USCurrFormat(const AValue: Currency): string; begin   Result := CurrFormatFromLCID(AValue, 1033); //1033 = US_LCID end;  function FrenchCurrFormat(const AValue: Currency): string; begin   Result := CurrFormatFromLCID(AValue, 1036); //1036 = French_LCID end;  procedure TestIt; var   val: Currency; begin   val:=1234.56;   ShowMessage('US: ' + USCurrFormat(val));   ShowMessage('FR: ' + FrenchCurrFormat(val));   ShowMessage('GB: ' + CurrFormatFromLCID(val, 2057)); // 2057 = GB_LCID   ShowMessage('def: ' + CurrFormatFromLCID(val)); end;