API GetNumTrainerServices

Returns the number of trainer services.
 numTrainerServices = GetNumTrainerServices()
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;Returns
:;numTrainerServices: : Total number of trainer services (used like index). Note that if you are working with an invalid target (for example, a merchant) the return value will be the last valid value, rather than 0.
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;Example
Prints the number of trainer services to the chatwindow
 ChatFrame1:AddMessage(GetNumTrainerServices());