VDH
30 lines
2.1 KiB
Markdown
30 lines
2.1 KiB
Markdown
# Skill Learn Flow (C++)
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1. **CDlgSkillSubListItem::OnCommand_Upgrade**
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- Triggered when the player clicks the learn/upgrade button on a skill.
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- Performs status checks (dead, trading, etc.), evaluates `CheckLearnCondition`, and shows the `Game_LearnSkill` confirmation dialog.
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- If the NPC greeting has not been received yet, calls `CECHostSkillModel::SendHelloToSkillLearnNPC()`.
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2. **CECHostSkillModel**
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- Maintains `m_skillLearnNPCNID`, the NPC ID that currently offers skill learning.
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- `ProcessServiceList()` scans `cmd_scene_service_npc_list` from the server, keeps the valid NPC, and resets `m_bReceivedNPCGreeting` when a new NPC is selected.
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- `SendHelloToSkillLearnNPC()` issues `c2s_CmdNPCSevHello(m_skillLearnNPCNID)` to start the NPC service handshake.
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- `OnNpcGreeting()` is invoked when `NPC_GREETING` (cmd 70) arrives; it marks the greeting as received so future learns skip re-hello.
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3. **CDlgSkillAction::TryOpenDialog**
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- Called when the skill dialog is being opened (skill vs action mode).
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- If the host isn’t currently “talking with the NPC,” it forces the dialog to open, sends `SendHelloToSkillLearnNPC()`, and clears the “received greeting” flag so the next dialog confirms again.
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4. **Game UI dialog**
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- Player confirms the `Game_LearnSkill` message box (`EC_GameUIMan::OnMessageBoxClose`).
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- If `IDOK` and `CheckSkillLearnCondition` still returns zero, it sends `c2s_CmdNPCSevLearnSkill(skillID)`.
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- The dialog name `"Game_LearnSkill"` ensures the server hasn’t rejected the skill because it missed the handshake.
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5. **Server round-trip**
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- `SEVNPC_HELLO` establishes the NPC service context.
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- Server replies with `NPC_GREETING`, parsed by `GameSession` and forwarded to `CECHostSkillModel::OnNpcGreeting`.
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- Only after the greeting can `SEVNPC_SERVE` with `GP_NPCSEV_LEARN` be trusted; else, the server often drops it without a `LEARN_SKILL` response.
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Use this sequence when troubleshooting missing `LEARN_SKILL` responses: show/confirm dialog → send `SEVNPC_HELLO` → wait for `NPC_GREETING` → send `GP_NPCSEV_LEARN`.
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