Boot time

[TimoVJL]

Inspirate from
http://masm32.com/board/index.php?msg=140972
I might fix this later.

Code Select Expand

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#define NTSTATUS  LONG

typedef struct _SYSTEM_TIMEOFDAY_INFORMATION
{
    LARGE_INTEGER BootTime;                     // Number of 100-nanosecond intervals since the system was started.
    LARGE_INTEGER CurrentTime;                  // The current system date and time.
    LARGE_INTEGER TimeZoneBias;                 // Number of 100-nanosecond intervals between local time and Coordinated Universal Time (UTC).
    ULONG TimeZoneId;                           // The current system time zone identifier.
    ULONG Reserved;                             // Reserved
    ULONGLONG BootTimeBias;                     // Number of 100-nanosecond intervals between the boot time and Coordinated Universal Time (UTC).
    ULONGLONG SleepTimeBias;                    // Number of 100-nanosecond intervals between the sleep time and Coordinated Universal Time (UTC).
} SYSTEM_TIMEOFDAY_INFORMATION, *PSYSTEM_TIMEOFDAY_INFORMATION;

#define SystemTimeOfDayInformation 3
// enum SYSTEM_INFORMATION_CLASS

//NTSTATUS WINAPI NtQuerySystemInformation(int SystemInformationClass,
//    PVOID SystemInformation, ULONG SystemInformationLength, PULONG ReturnLength);

typedef int (WINAPI NTQUERYSYSTEMINFORMATION)(int SystemInformationClass,
    PVOID SystemInformation, ULONG SystemInformationLength, PULONG ReturnLength);
typedef NTQUERYSYSTEMINFORMATION *LNTQUERYSYSTEMINFORMATION;
// FILETIME SYSTEMTIME
void __cdecl WinMainCRTStartup(void)
{
    HANDLE hLib;
    static LNTQUERYSYSTEMINFORMATION NtQuerySystemInformation;
    SYSTEM_TIMEOFDAY_INFORMATION stodi;
    FILETIME ft;
    SYSTEMTIME st;
    char szBuf[50];
    hLib = LoadLibrary("ntdll.dll");
    NtQuerySystemInformation = (LNTQUERYSYSTEMINFORMATION)GetProcAddress(hLib, "NtQuerySystemInformation");
    NtQuerySystemInformation(SystemTimeOfDayInformation, &stodi, sizeof(stodi), 0);
    (*(LONGLONG*)&stodi.BootTime) -= (*(LONGLONG*)&stodi.TimeZoneBias);
    ft.dwLowDateTime = ((LARGE_INTEGER*)&stodi.BootTime)->LowPart;
    ft.dwHighDateTime = ((LARGE_INTEGER*)&stodi.BootTime)->HighPart;
    FileTimeToSystemTime(&ft, &st);
    wsprintf(szBuf, "Date: %04d-%02d-%02d\nTime: %02d:%02d:%02d", st.wYear, st.wMonth, st.wDay,
        st.wHour, st.wMinute, st.wSecond);
    MessageBox(0, szBuf, "Boot time", MB_OK);
    ExitProcess(0);
}


[Vortex]

Hi Timo,

Keep up the nice work.

[Vortex]

Hi Timo,

Another method to get the boot time is to use the GetTickCount64 API function.