Test DLL for dll injection guide

dllmain.c

#include <windows.h>

BOOL APIENTRY DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
            MessageBoxA(NULL, "Hello From The Injected DLL", "Injected !", MB_OK | MB_ICONINFORMATION);
            break;

        case DLL_THREAD_ATTACH:
            MessageBoxA(NULL, "Hello From The Injected DLL", "Injected !", MB_OK | MB_ICONINFORMATION);
            break;

        case DLL_THREAD_DETACH:
            MessageBoxA(NULL, "Hello Again From The Injected DLL", "Injected !", MB_OK | MB_ICONINFORMATION);
            break;

        case DLL_PROCESS_DETACH:
            MessageBoxA(NULL, "Hello Again From The Injected DLL", "Injected !", MB_OK | MB_ICONINFORMATION);
            break;
    }

    return TRUE;
}