// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"
#include <string>

std::string test = "not Loaded";

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
	//test = "loaded"; //You also change on this location the value of a variable

	char cmd[] = "cmd.exe";

	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		//MessageBoxA(NULL, "test", "test", NULL);
		WinExec(cmd, SW_SHOWNORMAL);
		ExitProcess(0);
		break;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

extern "C" __declspec (dllexport) bool example()
{
	MessageBoxA(NULL, test.c_str(), "test", NULL);
	return true;
}