DinputTester.cpp

#include <iostream>
#include <chrono>

#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#include <windows.h>

#define DIRECTINPUT_VERSION 0x0800
#include <dinput.h>
#pragma comment(lib, "dinput8")
#pragma comment(lib, "dxguid")

using perf_clock = std::chrono::high_resolution_clock;
static perf_clock::time_point last_time;

BOOL CALLBACK EnumDevicesCb(LPCDIDEVICEINSTANCE diDevice, LPVOID)
{
    wchar_t guid[40];
    if (StringFromGUID2(diDevice->guidProduct, guid, ARRAYSIZE(guid)))
    {
        auto now = perf_clock::now();
        auto duration_ms = std::chrono::duration<double, std::milli>(now - last_time);
        last_time = now;
        std::wcout
            << L"Name: " << diDevice->tszProductName << L"\n"
            << L"GUID: " << guid << L"\n"
            << L"Enum time: " << duration_ms.count() << L" ms\n\n";
    }
    else {
        std::wcerr << L"Could not extract GUID for " << diDevice->tszProductName << L"\n";
    }
    return DIENUM_CONTINUE;
}

int main()
{
    IDirectInput8* di8;
    HRESULT hr = DirectInput8Create(GetModuleHandleW(nullptr), DIRECTINPUT_VERSION, IID_IDirectInput8, (void**)&di8, nullptr);
    if (FAILED(hr))
    {
        std::cerr << "Could not create DirectInput 8 handle\n";
        return 1;
    }

    last_time = perf_clock::now();

    if (di8->EnumDevices(DI8DEVCLASS_ALL, EnumDevicesCb, nullptr, DIEDFL_ATTACHEDONLY) != DI_OK)
    {
        std::cerr << "Could not enumerate devices.\n";
        return 2;
    }

    di8->Release();
    di8 = nullptr;

    return 0;
}