Check IsDebuggerPresent in msvc_sink before doing work. Fix #2408

1 files changed, 11 insertions, 1 deletions

diff --git a/include/spdlog/sinks/msvc_sink.h b/include/spdlog/sinks/msvc_sink.h
index b1dfd305..09008b78 100644
--- a/include/spdlog/sinks/msvc_sink.h
+++ b/include/spdlog/sinks/msvc_sink.h
@@ -1,8 +1,9 @@
-// Copyright(c) 2016 Alexander Dalshov.
+// 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>
@@ -13,6 +14,7 @@
 
 // Avoid including windows.h (https://stackoverflow.com/a/30741042)
 extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char *lpOutputString);
+extern "C" __declspec(dllimport) int __stdcall IsDebuggerPresent();
 
 namespace spdlog {
 namespace sinks {
@@ -24,10 +26,16 @@ class msvc_sink : public base_sink<Mutex>
 {
 public:
     msvc_sink() = default;
+    msvc_sink(bool check_ebugger_present)
+        : check_debbugger_present_{check_ebugger_present} {};
 
 protected:
     void sink_it_(const details::log_msg &msg) override
     {
+        if (check_debbugger_present_ && !IsDebuggerPresent())
+        {
+            return;
+        }
         memory_buf_t formatted;
         base_sink<Mutex>::formatter_->format(msg, formatted);
         formatted.push_back('\0'); // add a null terminator for OutputDebugStringA
@@ -35,6 +43,8 @@ protected:
     }
 
     void flush_() override {}
+
+    bool check_debbugger_present_ = true;
 };
 
 using msvc_sink_mt = msvc_sink<std::mutex>;