Usermode->Kernel communication using Events

DriverMain.c

#include <ntifs.h>

const wchar_t* EVENT_NAME = L"Global\\EventMeme";

extern "C"
NTSTATUS
DriverEntry(
    _In_ PDRIVER_OBJECT   DriverObject,
    _In_ PUNICODE_STRING  RegistryPath
)
{
    UNREFERENCED_PARAMETER(RegistryPath);
    HANDLE hEvent = OpenEvent(SYNCHRONIZE, FALSE, EVENT_NAME);
    if (hEvent == nullptr) {
        KdPrint(("Error opening event: %lu\n", GetLastError()));
        return STATUS_UNSUCCESSFUL;
    }

    KdPrint(("Waiting for the event...\n"));
    if (WaitForSingleObject(hEvent, INFINITE) != WAIT_OBJECT_0) {
        KdPrint(("Error waiting for event: %lu\n", GetLastError()));
    } else {
        KdPrint(("Event signaled!\n"));
    }

    CloseHandle(hEvent);
    return STATUS_SUCCESS;
}

ring3.cpp

#include <Windows.h>
#include <iostream>

// Example named event name
const wchar_t* EVENT_NAME = L"Global\\EventMeme";

int main() { 
    HANDLE hEvent = CreateEvent(nullptr, FALSE, FALSE, EVENT_NAME);
    if (hEvent == nullptr) {
        std::cerr << "Error creating event: " << GetLastError() << std::endl;
        return 1;
    }

    //do whatever
    SetEvent(hEvent); 
    CloseHandle(hEvent);

    return 0;
}