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maa-logging

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MaaFramework 日志宏用法指南。Use when writing logging code, using LogInfo/LogError/LogWarn/LogDebug/LogTrace, outputting containers or custom types to logs, or when the user asks about logging best practices.

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MaaFramework 日志宏用法

头文件：source/MaaUtils/include/MaaUtils/Logger.h

可用宏

宏级别
LogFatal / LogError / LogWarn错误与警告
LogInfo / LogDebug / LogTrace信息与调试
LogFunc函数作用域（进入打 enter，离开打 leave + 耗时）
VAR(x)格式化为 [x=value]
VAR_VOIDP(x)同上，但将指针转为 void* 输出

核心原则：不要手动拼字符串

用 << 流式输出即可，各片段间自动加空格分隔：

// Good
LogInfo << "Screen size:" << width << "x" << height;
LogError << "failed to override_pipeline" << VAR(entry) << VAR(pipeline_override);

// Bad - 不要手动拼接
LogInfo << "Screen size: " + std::to_string(width) + "x" + std::to_string(height);
LogInfo << std::format("Screen size: {}x{}", width, height);

容器直接输出

vector、set、map<string, T> 等 STL 容器可以直接 <<，会自动序列化为 JSON：

std::vector<std::string> names = { "a", "b", "c" };
LogInfo << "names:" << names;       // 输出: names: ["a","b","c"]

std::map<std::string, int> config;
LogInfo << "config:" << config;     // 输出: config: {"key":value,...}

不需要手动写 for 循环来打印容器内容。

自定义类型输出

给结构体加 MEO_TOJSON(...) 或 MEO_JSONIZATION(...)，即可直接输出：

struct ProcessInfo
{
    os_pid pid = 0;
    std::string name;

    MEO_TOJSON(pid, name);  // 只需序列化，不需要反序列化
};

// MEO_JSONIZATION = MEO_TOJSON + MEO_FROMJSON + MEO_CHECKJSON
struct OCRerResult
{
    std::wstring text;
    cv::Rect box {};
    double score = 0.0;

    MEO_JSONIZATION(text, box, score);
};

// 直接输出，包括容器嵌套也能工作
LogInfo << VAR(results);  // results 是 vector<OCRerResult>

原理简述

LogStream::stream 按优先级尝试：

  1. 可构造 json::value → dumps() 输出（含 MEO_TOJSON 类型、基本类型）
  2. 可构造 json::array → dumps() 输出（含序列容器）
  3. 可构造 json::object → dumps() 输出（含 map<string, T>）
  4. 有 operator<< → 直接流输出
  5. 以上都不满足 → static_assert 编译失败

如果遇到编译报错 "Unsupported type"，给类型加 MEO_TOJSON 或特化 json::ext::jsonization<T> 即可。