CMakeLists.txt

cmake_minimum_required (VERSION 3.0)
project (test_case2)

set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT")

set (srcs
	main.cpp
)

set (hdrs
)

add_library ( ${PROJECT_NAME} SHARED ${hdrs} ${srcs})

main.cpp

#include <Windows.h>
#include <stdio.h>
#include <string>
#include <mutex>

DWORD threadID;

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		MessageBoxA(NULL, "DLLMain :D!", "We've started.", 0);
		break;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

//extern "C" to prevent C++ name mangling
extern "C" __declspec(dllexport) BOOL SayGoodbye(LPVOID lpUserdata, DWORD nUserdataLen)
{
	std::mutex testMutex;
	try {
		int i = 0, j = 1;
		j /= i;   // This will throw a SE (divide by zero).
	}
	catch (...) {
		MessageBoxA(NULL, "C++ Exception Thrown!", "Caught it", 0);
	}

	MessageBoxA(NULL, "I'm Leaving!", "Goodbye", 0);
	
	return TRUE;
}