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spdlog 是一个开源的、快速的、仅有头文件的 C++11 日志库,代码地址在 https://www.php.cn/link/037be3f3bf37ffed5e5b8750c514ad17 ,目前最新发布版本为 0.14.0。它提供了向流、标准输出、文件、系统日志、调试器等多种目标输出日志的能力,支持的平台包括 Windows、Linux、Mac、Android。
spdlog 的特性包括:
(1) 速度极快,性能是其主要目标;
(2) 仅包含头文件,方便使用;
(3) 日志格式化处理使用开源的 fmt 库(https://www.php.cn/link/02251d47085ed33996c248c852dd3fa3);
(4) 可选地支持 printf 语法;
(5) 提供非常快的异步模式(可选),支持异步写日志;
(6) 支持自定义格式;
(7) 支持条件日志;
(8) 支持多线程和单线程日志;
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(9) 多种日志目标:可对日志文件进行循环输出;可每日生成日志文件;支持控制台日志输出(支持颜色);系统日志;Windows 调试器;易于扩展自定义日志目标;
(10) 支持日志输出级别:阈值级别可以在运行时或编译时修改。
以下是测试代码,主要来自 spdlog/example/example.cpp:
#include "funset.hpp"#include #include "spdlog/spdlog.h"#include "spdlog/fmt/ostr.h"namespace spd = spdlog;int test_spdlog_console(){ try { // Console logger with color auto console = spd::stdout_color_mt("console"); console->info("Welcome to spdlog!"); console->error("Some error message with arg{}..", 1); // Conditional logging example console->info_if(true, "Welcome to spdlog conditional logging!"); // Formatting examples console->warn("Easy padding in numbers like {:08d}", 12); console->critical("Support for int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42); console->info("Support for floats {:03.2f}", 1.23456); console->info("Positional args are {1} {0}..", "too", "supported"); console->info("{"); console->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function"); // Create basic file logger (not rotated) auto my_logger = spd::basic_logger_mt("basic_logger", "E:/GitCode/Messy_Test/testdata/basic_log"); my_logger->info("Some log message"); // Create a file rotating logger with 5mb size max and 3 rotated files auto rotating_logger = spd::rotating_logger_mt("some_logger_name", "E:/GitCode/Messy_Test/testdata/mylogfile_log", 1048576 * 5, 3); for (int i = 0; i info("{} * {} equals {:>10}", i, i, i*i); } // Create a daily logger - a new file is created every day on 2:30am auto daily_logger = spd::daily_logger_mt("daily_logger", "E:/GitCode/Messy_Test/testdata/daily_log", 2, 30); // trigger flush if the log severity is error or higher daily_logger->flush_on(spd::level::err); daily_logger->info(123.44); // Customize msg format for all messages spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***"); rotating_logger->info("This is another message with custom format"); // Runtime log levels spd::set_level(spd::level::info); //Set global log level to info console->debug("This message shold not be displayed!"); console->set_level(spd::level::debug); // Set specific logger's log level console->debug("This message shold be displayed.."); // Compile time log levels // define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23); SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23); SPDLOG_DEBUG_IF(console, true, "This is a debug log"); // Apply a function on all registered loggers spd::apply_all([&](std::shared_ptr l) { l->info("End of example."); }); // Release and close all loggers spdlog::drop_all(); } // Exceptions will only be thrown upon failed logger or sink construction (not during logging) catch (const spd::spdlog_ex& ex) { std::cout << "Log initialization failed: " << ex.what() <warn("This is warning that will end up in syslog."); #endif return 0;}// user defined types logging by implementing operator<<struct my_type { int i; explicit my_type(int a):i(a){}};template friend OStream& operator<<(OStream& os, const my_type& c) { return os << "[my_type i=" << c.i <info("user defined type: {}", my_type{ 14 }); } catch (const spd::spdlog_ex& ex) { std::cout << "Log initialization failed: " << ex.what() << std::endl; } return 0;}// error handling (can be set globally or per logger(using spdlog::logger::set_error_handler(..))spdlog::set_error_handler([](const std::string& msg){std::cerr << "*** spdlog error: " << msg << " ***" <info("some invalid message to trigger an error {}{}{}{}", 3); } catch (const spd::spdlog_ex& ex) { std::cout << "Log initialization failed: " << ex.what() << std::endl; } return 0;}
执行结果如下:
![log库spdlog简介及使用[通俗易懂]](https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png)
GitHub: https://www.php.cn/link/df236b5b4ec12e88f2cb714b641b8cc4
发布者:全栈程序员栈长,转载请注明出处:https://www.php.cn/link/06ac68cc0db1c6c3992eb55812168e55
原文链接:https://www.php.cn/link/c8377ad2a50fb65de28b11cfc628d75c
以上就是log库spdlog简介及使用[通俗易懂]的详细内容,更多请关注创想鸟其它相关文章!
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