c++日志工具spdLog简单使用示例代码

spdlog直接引用头文件就可以使用，这一点还是比较方便的，也是刚入门使用，下面是在源码的示例代码基础上修改测试的代码：

#include <cstdio>
#include <iostream>
#include "spdlog/spdlog.h"
#include "spdlog/sinks/stdout_color_sinks.h" // or "../stdout_sinks.h" if no color needed
#include "spdlog/sinks/basic_file_sink.h"
#include "spdlog/sinks/rotating_file_sink.h"

void err_handler_example()
{
    spdlog::set_error_handler([](const std::string& msg){printf("*****Custom log error handler, %s*****%\n", msg.c_str());});
}

int main(int , char *[])
{
    try
    {
        auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
        console_sink->set_level(spdlog::level::debug);
        console_sink->set_pattern("%^[%Y-%m-%d %H:%M:%S:%e] [%n] [%t] [%l] %v%$");

        //auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", false);
        auto file_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>("logs/multisink.txt", 1048576, 3);
        file_sink->set_pattern("[%Y-%m-%d %H:%M:%S:%e] [%n] [%t] [%l] %v");
        file_sink->set_level(spdlog::level::debug);

        std::vector<spdlog::sink_ptr> sinks;
        sinks.push_back(console_sink);
        sinks.push_back(file_sink);

        //spdlog::logger *logger = new spdlog::logger("multi_sink", {console_sink, file_sink});
        auto logger = std::make_shared<spdlog::logger>("multi_sink", begin( sinks ), end( sinks ));
        //logger->set_level(spdlog::level::debug);

#if 0  //也可以使用这种方式

        spdlog::sinks_init_list sink_list = { console_sink->sinks().front(), file_sink->sinks().front() };
        //创建一个新的日志对象，以上面两个日志对象作为初始化参数，即实现了同时输出 console 和 file
        auto log_ptr = spdlog::create("loggername", sink_list);

        spdlog::register_logger( combined_logger );
#endif
        err_handler_example();

        logger->warn("this should appear in both console and file");

        logger->info("this message should appear in file , not in console");

        //注册到spdlog里
        spdlog::register_logger(logger);

        auto test_logger = spdlog::get("multi_sink");
        test_logger->info("getlogger::helloworld");

        std::string msg = "hello world 2019.";
        logger->warn("spdlog: {}", msg);

        auto rotating_logger = spdlog::rotating_logger_mt("log_rotating", "logs/rotating.txt", 256, 2);
        for (int i = 0; i < 10; ++i)
            rotating_logger->info("{} * {} equals {:>10}", i, i, i*i);

    }
    catch (const spdlog::spdlog_ex &ex)
    {
        std::cout<<"Log initialization faild"<<ex.what()<<std::endl;
    }

}

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