msvc_sink.h

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// Copyright(c) 2016 Alexander Dalshov.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
#pragma once
 
#if defined(_WIN32)
 
#    include <spdlog/details/null_mutex.h>
#    include <spdlog/sinks/base_sink.h>
 
#    include <mutex>
#    include <string>
 
// Avoid including windows.h (https://stackoverflow.com/a/30741042)
extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char *lpOutputString);
 
namespace spdlog {
namespace sinks {
/*
 * MSVC sink (logging using OutputDebugStringA)
 */
template<typename Mutex>
class msvc_sink : public base_sink<Mutex>
{
public:
    msvc_sink() = default;
 
protected:
    void sink_it_(const details::log_msg &msg) override
    {
        memory_buf_t formatted;
        base_sink<Mutex>::formatter_->format(msg, formatted);
        OutputDebugStringA(fmt::to_string(formatted).c_str());
    }
 
    void flush_() override {}
};
 
using msvc_sink_mt = msvc_sink<std::mutex>;
using msvc_sink_st = msvc_sink<details::null_mutex>;
 
using windebug_sink_mt = msvc_sink_mt;
using windebug_sink_st = msvc_sink_st;
 
} // namespace sinks
} // namespace spdlog
 
#endif