Best way\place to get currency data

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I am writing a Windows Store app that needs to get currencies from the internet, what is the best way to do this?

 

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Can you be a bit more specific? Do you mean a list of currency ISO codes? A list of exchange rates? If so, what exchange rates do you need?

I want a list of exchange rates.

If you're after exchange rates the Yahoo Finance API seems to be used by a fair few things. OpenCart uses it. Here's their function.

You'd just have to construct a dynamic URL including the currencies you want as a comma seperated list, curAcurB=X. E.g. for GBP to USD, GBP to EUR and GBP to JPY:

http://download.finance.yahoo.com/d/quotes.csv?s=GBPUSD=X,GBPEUR=X,GBPJPY=X&f=sl1&e=.csv

Thanks, that is what I was looking for, any idea on how to use this with C++?

Also, random question, do you have to use Windows 8 and Visual Studio 2012 for Windows Store apps?