Beep with a ioctl

beep.cpp

#include <stdio.h>
#include <cstdint>
#include <Windows.h>

struct Beep
{
    uint32_t freq;
    uint32_t duration;
};

void main()
{
    HANDLE handle = CreateFileA("\\\\.\\GLOBALROOT\\Device\\Beep", GENERIC_READ | GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);

    ULONG code = 0x10000;

    for (int i = 0;;i+=10)
    {
        struct Beep input = {};
        input.freq = 2000+i;
        input.duration = 50;
        DeviceIoControl(handle, code, &input, sizeof(input), nullptr, 0, nullptr, nullptr);

        Sleep(100);
    }


    CloseHandle(handle);
}