[Help] Packet 0x7034 (buy item) - Game crash

[torstmn]

Hey guys, im currently working on a bot for the VSRO files and im doing some realy good progress. Currently im working on a shopping manager component But somehow the 0x7034 packet crashes the client instantly when sending it.

What I do is the following:
1. Select shop with 0x7045 (Working correctly)
2. Then I query the items I want to buy (bla bla code)
3. Then I want to buy the specific item like this:

            
var packet = new Packet(0x7034);
packet.WriteByte(0x08); //Buy item flag
packet.WriteByte(tabIndex);
packet.WriteByte(item.SlotIndex);
packet.WriteUShort(amount);
packet.WriteUInt(npc.UniqueId);

PacketManager.SendPacket(packet, PacketDestination.Server);

After sending this packet the game crashes without any warning (but I got the bought items anyway).
I tripple checked the data I provide in this packet. It's correct, so there has to be something else - Do you guys have an idea what?

[DaxterSoul]

Your 0x7034 is correct. You're crashing on 0xB034 - SERVER_AGENT_INVENTORY_OPERATION_ACK because the client has not loaded the ShopTabGroup and can't find the item by the TabIndex and SlotIndex.

You can try to click 1. Purchase/ Sell Chinese Goods for example, this will trigger the loading for the NPC. If you inject your purchase packet again, the client can find the item and won't crash. However user input is not practical for a bot, i guess.

Don't let the packet reach your client if its shop related.
Generate a fake response using a different inventory operation and feed the information from the original response.

[oksn123]

Someone help me please ı have the same crash in my program but ı dont know how to fake response someone helpme please ?

[#HB]

Miss posted.

[oksn123]

SomeOne gonna help me ? Please?

[homelesshobo]

When you buy items, you receive a B034 response

 Spoiler

[S -> C][B034]
[S -> C][B034]
01         // success
08         // item update type (8 == Buy, change to 6 to fake pickup)
00         // shop tab
00         // shop slot
01         // number of inventory slots used
37         // inventory slot
01 00      // amount bought
00 00 00 00 // recipientID? (0== self ?)

which you can intercept in your Agent Server's incoming packet stream.
Then you can choose to either
1. Block it from your client
or
2. Use by faking a pickup response, change the item movement type to "pickup", then send the changed packet to your client as a pickup packet instead.

Blocking is easier because you just filter it after sending the 7034 packet to buy an item.
The downside is that it will not update your client, so you will have to teleport to update your inventory.

Sending a fake packet is more difficult, but you will see the updated inventory right away.

(the amount must be FakePickUp.WriteUInt16(Amount))

[oksn123]

Thank You