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Can't you use ChatFrame_AddMessageEventFilter and just catch the language argument (arg3) passed with the chat message? I can't recall the last time I saw anyone /say or /yell anything in a language other than their faction's default language, so just checking for Orcish or Common should catch 99% of cases.
Another option would be to do what BadBoy_Levels does to check levels, and attempt to add the player to your friends list and catch the result message. If it's successful, the player is part of your faction; if it failed, the player is of the opposing faction. This wouldn't work for cross-realm players, but I think the chances of someone of the opposite faction from another server /saying or /yelling anything in a non-default language are pretty slim.
Finally, SendAddonMessage doesn't need a return value, as it's trivial to catch the message printed to the chat frame when sending fails, and hide it from the user.
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Retired author of too many addons.
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Last edited by Phanx : 12-01-12 at 01:59 AM.
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