WoW:API GetCraftSkillLine
Template:Delete See history. I think this was meant to be at API GetCraftInfo.
The command still exists though. While I don`t understand exactly what it does, I do know that it can be used to determine whether the enchanting-window is currently opened or not (which is a prequisite for API GetCraftInfo to work). You can use it like this to achieve that:
temp = GetCraftSkillLine(1); if (temp) then -- You can use GetCraftInfo() here else -- If you use GetCraftInfo() here it should produce an error end