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If all else fails I could rather easily just do this. Set up a spawn point, make that spawn point randomly spawn maybe 10 vendors, each with a 10 percent chance of being spawned. Each vendor has different items. The vendors have player names instead of npc names, makes it more real. Have them do random calls, at random times. This would give an element of randomness. That vendor stays there for an amount of time then despawns at a random time, then it repeats. Do this for maybe 50-100 spawn points would be a start. It is not what I want though. What I actually want are the items randomly generated. As far as getting the items in the database and random items that seems easy with MySQL DBI statements in the vendor Perl file. It is getting that NPC to do the trader things I am getting stuck at.
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The idea of an auction bot is attractive to most players, your version of it though I'm not sure(not sure how random items play into an auction bot). While this may be possible using only Perl, I think the more elegant solution is going to involve more C++ than Perl.
Derision only said that currently its not possible for the bazaar code to handle NPCs, without ever having looked at the code I wonder if making it recognize NPCs is not the best way to go in this situation. In this case I think the NPC is little more than visual placeholder, would have to track the items for sale more reliably than in a bag on an NPC.
I envison it more like walking up to a generic NPC and purchasing a place in the bazaar, this would copy the look and name of your character onto that NPC and load any previous items you had for sale into his inventory. Then by giving him items, he writes those to the db and updates his list. Clients can then use the bazaar window to search for items as they would if the player was in zone as well. If it got paired up with the barter window as well, might be able to do the reverse and have roving NPC buyers who buy things for their clients as they are put up for sale.
Without using any c++ I think the best you could do is have the NPCs /auc items, then when players hail the NPC they are given a list of saylinks of the items for sale with prices. If they have enough plat when they click the desired link, it removes the plat from their char, deletes the item from the sellers db and then summons one to their cursor.