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



// https://www.tutorialspoint.com/dll/dll_writing.htm
void HelloWorld()
{
    MessageBox(NULL, TEXT("Hello World"),
        TEXT("In a DLL"), MB_OK);
}

// https://tbhaxor.com/loading-dlls-using-cpp-in-windows/
BOOL WINAPI DllMain(
    HINSTANCE hinstDLL,  // handle to DLL module
    DWORD fdwReason,     // reason for calling function
    LPVOID lpReserved)  // reserved
{
    // Perform actions based on the reason for calling.
#ifdef _TEST1
    switch (fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        // Initialize once for each new process.
        //std::cout << "Test Dll attached";
        std::cout << "Test Dll attached";
        break;

    case DLL_THREAD_ATTACH:
        // Do thread-specific initialization.
        break;

    case DLL_THREAD_DETACH:
        // Do thread-specific cleanup.
        break;

    case DLL_PROCESS_DETACH:
        // Perform any necessary cleanup.
        std::cout << "Test Dll detached";
        break;
    }
#endif // _TEST1

    // Successful. If this is FALSE, the process will be terminated eventually
    // https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-entry-point-function#entry-point-function-return-value
    return TRUE;
}

// Not sure how this works
//typedef DWORD(*AddFunc)(DWORD, DWORD);
//typedef DWORD(*DivFunc)(DWORD, DWORD);
//typedef DWORD(*SubFunc)(DWORD, DWORD);
//typedef DWORD(*ProFunc)(DWORD, DWORD);
//
//EXTERN_C DWORD AddFunc(DWORD x, DWORD y) {
//    return x + y;
//}
//
//EXTERN_C DWORD SubFunc(DWORD x, DWORD y) {
//    return x - y;
//}
//
//EXTERN_C DWORD DivFunc(DWORD x, DWORD y) {
//    return x / y;
//}
//
//EXTERN_C DWORD ProFunc(DWORD x, DWORD y) {
//    return x * y;
//}