Example of adding a file-based logging method

Factory.cpp

#include <boost/filesystem.hpp>
#include "SystemHelpers.h"
using namespace boost::filesystem;

/// ...


    void getLoggingMethods( FB::Log::LogMethodList& outMethods )
    {
        path appDataPath = FB::System::getLocalAppDataPath("CompanyName");
        
        path logDirPath = appDataPath / "logs";
        if (exists(logDirPath) && is_directory(logDirPath)) {
            std::stringstream ss;
            time_t seconds = time(NULL);
            boost::thread::id threadId = boost::this_thread::get_id();
            ss << seconds << "_" << threadId << ".log";

            path logPath = logDirPath / ss.str();

            fprintf(stderr, "logging to %s", logPath.string().c_str());
            outMethods.push_back(std::make_pair(FB::Log::LogMethod_File, logPath.string()));
        }
#ifndef NDEBUG
        outMethods.push_back(std::make_pair(FB::Log::LogMethod_Console, std::string()));
#endif
    }


// ...

Note that this requires add_boost_library(filesystem) in your PluginConfig (because it relies on boost::filesystem). If you use this exactly as written logging to the console will be enabled for all debug builds and logging to file will be enabled if the directory exists.

On windows 7 this will be in the %USERPROFILE%\AppData\LocalLow\CompanyName\logs dir, on xp it will be %USERPROFILE%\Application Data\Local Settings\CompanyName\logs, and on Mac it'll be ~/Library/Application Support/CompanyName/logs

Also need to #include "boost/thread.hpp" if it's not already present (can't add angles in comments it seems).

how about linux ?

got it, the reason was *.so has not be update.