我建议创建一个自定义的sink后端,将日志消息转发到Android日志功能。以下示例代码实现了这一点,并使用了Android日志级别,以便您可以根据日志级别过滤日志消息。当然,您也可以定义自己的日志级别,并添加在您的日志级别和Android日志级别之间的映射。
您需要调用
boost_android_logging::init()
一次,然后可以在需要时实例化
boost_android_logging::Logger
并使用
BOOST_LOG_SEV
发送日志消息。
#include <iostream>
typedef enum android_LogPriority {
ANDROID_LOG_UNKNOWN = 0,
ANDROID_LOG_DEFAULT,
ANDROID_LOG_VERBOSE,
ANDROID_LOG_DEBUG,
ANDROID_LOG_INFO,
ANDROID_LOG_WARN,
ANDROID_LOG_ERROR,
ANDROID_LOG_FATAL,
ANDROID_LOG_SILENT,
} android_LogPriority;
int fake__android_log_print(int prio, const char *tag, const char *fmt, ...)
{
std::cout << prio << " " << tag << ": " << fmt << std::endl;
return 0;
}
#include <boost/log/attributes.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/core.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/utility/setup.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/expressions/keyword.hpp>
namespace boost_android_logging
{
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", android_LogPriority)
BOOST_LOG_ATTRIBUTE_KEYWORD(module, "Module", std::string)
namespace logging = boost::log;
namespace sinks = boost::log::sinks;
namespace expr = boost::log::expressions;
struct android_sink_backend : public sinks::basic_sink_backend<logging::sinks::concurrent_feeding>
{
void consume(const logging::record_view& rec)
{
android_LogPriority log_sev = rec[severity].get();
const char* log_msg = rec[expr::smessage].get().c_str();
const char* log_module = "unknown";
if (rec[module])
{
log_module = rec[module].get().c_str();
}
fake__android_log_print(log_sev, log_module, log_msg);
}
};
typedef boost::log::sources::severity_logger<android_LogPriority> Logger;
void init()
{
logging::add_common_attributes();
typedef sinks::synchronous_sink<android_sink_backend> android_sink;
boost::shared_ptr<android_sink> sink = boost::make_shared<android_sink>();
sink->set_filter(severity >= ANDROID_LOG_INFO);
logging::core::get()->add_sink(sink);
}
void shutdown()
{
logging::core::get()->remove_all_sinks();
}
}
#define SET_MODULE(logger,log_module) logger.add_attribute(boost_android_logging::module.get_name(), boost::log::attributes::constant<std::string>(#log_module));
struct Demo
{
Demo()
{
SET_MODULE(logger, Demo);
BOOST_LOG_SEV(logger, ANDROID_LOG_WARN) << "this is a warning";
}
void test()
{
BOOST_LOG_SEV(logger, ANDROID_LOG_FATAL) << "fatal error occured";
}
boost_android_logging::Logger logger;
};
int main()
{
boost_android_logging::init();
boost_android_logging::Logger logger;
SET_MODULE(logger, main);
BOOST_LOG_SEV(logger, ANDROID_LOG_WARN) << "this is a warning";
BOOST_LOG_SEV(logger, ANDROID_LOG_DEBUG) << "this will be filtered";
BOOST_LOG_SEV(logger, ANDROID_LOG_FATAL) << "fatal error occured";
Demo d;
d.test();
boost_android_logging::shutdown();
}
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