订单管理与错误处理

Lesson Overview

In "MQL5 EA Programming Intro" → "EA 逻辑开发", this lesson "订单管理与错误处理" builds knowledge you can apply immediately.

订单管理需区分请求受理和成交，错误恢复必须先查状态。真实交易接口涉及账户权限、合约与幂等，本教学示例不执行这些接口。 画无请求/在途/部分成交/完成/拒绝/未知状态图→为每状态列允许动作→超时先对账，不能自动无限重试。 本课作业：设请求超时且未知是否成交，设计纸面错误处理记录，禁止发真实订单。

Core Concepts

These points align with the video walkthrough—take notes as you watch.

• ▸订单管理需区分请求受理和成交，错误恢复必须先查状态。真实交易接口涉及账户权限、合约与幂等，本教学示例不执行这些接口。
• ▸画无请求/在途/部分成交/完成/拒绝/未知状态图→为每状态列允许动作→超时先对账，不能自动无限重试。
• ▸本课作业：设请求超时且未知是否成交，设计纸面错误处理记录，禁止发真实订单。

Practical Application

After studying, complete the companion practice lesson to move from understanding to doing.

• ▸Follow along in Jupyter or VS Code
• ▸Log how parameter changes affect backtest results
• ▸Submit a reproducible analysis notebook

FAQ

• ▸Q: How does this lesson fit the course? A: Part of "EA 逻辑开发"—follow the curriculum order.
• ▸Q: What do I need? A: Demo account and notes; quant lessons need a Python environment.
• ▸Q: How do I know I've mastered it? A: Pass the quiz and explain three key points of 订单管理与错误处理 on your own.