Function EnableProviders

PresentData/PresentMonTraceSession.cpp:235–272

detects windows version, enables providers, sets event filters in realtime mode

// detects windows version, enables providers, sets event filters in realtime mode
ULONG EnableProviders(
    TRACEHANDLE sessionHandle,
    GUID const& sessionGuid,
    PMTraceConsumer* pmConsumer)
{
    ULONG status = 0;

    // Lookup what OS we're running on
    //
    // We can't use helpers like IsWindows8Point1OrGreater() since they FALSE
    // if the application isn't built with a manifest.
    bool isWin81OrGreater = false;
    bool isWin11OrGreater = false;
    {
        auto hmodule = LoadLibraryExA("ntdll.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
        if (hmodule != NULL) {
            auto pRtlGetVersion = (LONG (WINAPI*)(RTL_OSVERSIONINFOW*)) GetProcAddress(hmodule, "RtlGetVersion");
            if (pRtlGetVersion != nullptr) {
                RTL_OSVERSIONINFOW info = {};
                info.dwOSVersionInfoSize = sizeof(info);
                status = (*pRtlGetVersion)(&info);
                if (status == 0 /* STATUS_SUCCESS */) {
                    // win8.1 = version 6.3
                    // win11  = version 10.0 build >= 22000
                    isWin81OrGreater = info.dwMajorVersion >  6 || (info.dwMajorVersion ==  6 && info.dwMinorVersion >= 3);
                    isWin11OrGreater = info.dwMajorVersion > 10 || (info.dwMajorVersion == 10 && info.dwBuildNumber  >= 22000);
                }
            }
            FreeLibrary(hmodule);
        }
    }

    // Scope filtering based on event ID only works on Win8.1 or greater.
    bool filterEventIds = isWin81OrGreater;
    pmConsumer->mFilteredEvents = filterEventIds;

    return EnableProvidersListing(sessionHandle, &sessionGuid, pmConsumer, filterEventIds, isWin11OrGreater);
}

void DisableProviders(TRACEHANDLE sessionHandle)
{