GetCpuName.cpp

#include <string>
#include <vector>
#include <format>

#include <initguid.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <devpkey.h>

std::wstring GetCpuName()
{
    HDEVINFO info = SetupDiGetClassDevsW(&GUID_DEVCLASS_PROCESSOR, NULL, NULL, DIGCF_PRESENT);
    SP_DEVINFO_DATA data = {.cbSize = sizeof(SP_DEVINFO_DATA)};

    int index{};
    std::vector<byte> string{};

    for (; SetupDiEnumDeviceInfo(info, index, &data); index++)
        if (string.empty())
        {
            DWORD size{};
            DEVPROPTYPE type{};
            SetupDiGetDevicePropertyW(info, &data, &DEVPKEY_Device_FriendlyName, &type, NULL, 0, &size, 0);

            string.resize(size);
            SetupDiGetDevicePropertyW(info, &data, &DEVPKEY_Device_FriendlyName, &type, string.data(), size, NULL, 0);
        }
    SetupDiDestroyDeviceInfoList(info);

    return std::format(L"{}x {}", index, std::wstring(reinterpret_cast<PWSTR>(string.data())));
}

int main()
{
    __builtin_printf("%ls\n", GetCpuName().c_str());
    return EXIT_SUCCESS;
}