This is no longer a part of the World of Warcraft API. It was removed in patch 3.3.

count = GetNumLFGResults()

TakesEdit

Nothing

ReturnsEdit

Number

count

Contains the number of results

EventsEdit

Needs (UPDATE_LFG)

DetailsEdit

Use GetLFGResults(index) to retrieve each result.

Notice: LFG functions implement a flexible but experimental system for finding a group in WoW. It probably has been postponed or is not under development anymore. Current public servers seem to not have the needed functionality enabled either and reply with empty packets when using these functions.