[Windows] 起動時に必ず実行ファイルのディレクトリをカレントディレクトリにする #1227

Siv3D/src/Siv3D-Platform/WindowsDesktop/Siv3D/Siv3DMain.cpp

@@ -14,6 +14,8 @@
 # include <Siv3D/Error.hpp>
 # include <Siv3D/Unicode.hpp>
 # include <Siv3D/Format.hpp>
+# include <Siv3D/System.hpp>
+# include <Siv3D/FileSystem.hpp>
 # include <Siv3D/EngineLog.hpp>
 # include <Siv3D/FreestandingMessageBox/FreestandingMessageBox.hpp>
 # include <Siv3D/EngineOptions.hpp>
@@ -259,6 +261,19 @@ namespace s3d
 		MainSEH();
 	}
 
+	static void SetWorkingDirectory()
+	{
+		if (System::IsRunningInVisualStudio())
+		{
+			return;
+		}
+
+		if (const FilePath workingDirectory = FileSystem::ParentPath(FileSystem::ModulePath()))
+		{
+			FileSystem::ChangeCurrentDirectory(workingDirectory);
+		}
+	}
+
 	namespace detail::init
 	{
 		void InitCommandLines(int argc, char** argv);
@@ -286,6 +301,8 @@ int WINAPI WinMain(_In_ HINSTANCE, _In_opt_ HINSTANCE, _In_ LPSTR, _In_ int)
 		::CoInitializeEx(nullptr, COINIT_MULTITHREADED);
 	}
 
+	SetWorkingDirectory();
+
 	std::unique_lock ul(g_mutex); // (0)--
 
 	const std::future<void> f = std::async(std::launch::async, MainThread);