msvc_sink.h
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// Copyright(c) 2016 Alexander Dalshov & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
#if defined(_WIN32)
# include <spdlog/details/null_mutex.h>
# if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
# include <spdlog/details/os.h>
# endif
# include <spdlog/sinks/base_sink.h>
# include <mutex>
# include <string>
// Avoid including windows.h (https://stackoverflow.com/a/30741042)
# if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
extern "C" __declspec(dllimport) void __stdcall OutputDebugStringW(const wchar_t *lpOutputString);
# else
extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char *lpOutputString);
# endif
extern "C" __declspec(dllimport) int __stdcall IsDebuggerPresent();
namespace spdlog {
namespace sinks {
/*
* MSVC sink (logging using OutputDebugStringA)
*/
template<typename Mutex>
class msvc_sink : public base_sink<Mutex>
{
public:
msvc_sink() = default;
msvc_sink(bool check_debugger_present)
: check_debugger_present_{check_debugger_present} {};
protected:
void sink_it_(const details::log_msg &msg) override
{
if (check_debugger_present_ && !IsDebuggerPresent())
{
return;
}
memory_buf_t formatted;
base_sink<Mutex>::formatter_->format(msg, formatted);
formatted.push_back('\0'); // add a null terminator for OutputDebugString
# if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
wmemory_buf_t wformatted;
details::os::utf8_to_wstrbuf(string_view_t(formatted.data(), formatted.size()), wformatted);
OutputDebugStringW(wformatted.data());
# else
OutputDebugStringA(formatted.data());
# endif
}
void flush_() override {}
bool check_debugger_present_ = true;
};
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