`GetGuildMemberIndexFromDisplayName`

ESO Lua API function — used by 60 of the 3,030 addons we indexed (combined 4,280,262 downloads). Signature from the official ESOUIDocumentation.txt, API version 101050.

Official signature

GetGuildMemberIndexFromDisplayName(integer guildId, string displayName)

Returns: luaindex:nilable memberIndex

Real usage — from pChat (Chat customization & help: look/notification/sound/automation/history)

                    --Get guildMemberData from guildRoster, compare account and get it's level then
                    memberIndex = GetGuildMemberIndexFromDisplayName(guildId, accountName)
                end

Short excerpt from the shipping addon pChat (Chat customization & help: look/notification/sound/automation/history) — its ESOUI page; the code belongs to its author. Shown because documentation without a working example is half a reference.

Most-downloaded addons using it

Addon	Total downloads
pChat (Chat customization & help: look/notification/sound/automation/history)	1,832,805
Arkadius' Trade Tools	845,488
ESO-Database.com Export AddOn	272,910
Guild Hall Button	266,680
Shissu's Guild Tools	186,581
LGM - Lilith's Group Manager	87,503