VirtualBox

source: vbox/trunk/src/VBox/Runtime/testcase/ntGetTimerResolution.cpp@ 918

Last change on this file since 918 was 1, checked in by vboxsync, 55 years ago

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1/* $Id: ntGetTimerResolution.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2/** @file
3 * InnoTek Portable Runtime - Win32 (NT) testcase for getting the timer resolution.
4 */
5
6/*
7 * Copyright (C) 2006 InnoTek Systemberatung GmbH
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License as published by the Free Software Foundation,
13 * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14 * distribution. VirtualBox OSE is distributed in the hope that it will
15 * be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * If you received this file as part of a commercial VirtualBox
18 * distribution, then only the terms of your commercial VirtualBox
19 * license agreement apply instead of the previous paragraph.
20 */
21
22
23/*******************************************************************************
24* Header Files *
25*******************************************************************************/
26#define _WIN32_WINNT 0x0500
27#include <Windows.h>
28#include <stdio.h>
29
30extern "C" {
31/* from sysinternals. */
32NTSYSAPI LONG NTAPI NtQueryTimerResolution(OUT PULONG MinimumResolution, OUT PULONG MaximumResolution, OUT PULONG CurrentResolution);
33}
34
35
36int main()
37{
38 ULONG Min = ~0;
39 ULONG Max = ~0;
40 ULONG Cur = ~0;
41 NtQueryTimerResolution(&Min, &Max, &Cur);
42 printf("NtQueryTimerResolution -> Min=%lu Max=%lu Cur=%lu (100ns)\n", Min, Max, Cur);
43
44#if 0
45 /* figure out the 100ns relative to the 1970 epoc. */
46 SYSTEMTIME st;
47 st.wYear = 1970;
48 st.wMonth = 1;
49 st.wDayOfWeek = 4; /* Thor's day. */
50 st.wDay = 1;
51 st.wHour = 0;
52 st.wMinute = 0;
53 st.wSecond = 0;
54 st.wMilliseconds = 0;
55
56 FILETIME ft;
57 if (SystemTimeToFileTime(&st, &ft))
58 {
59 printf("epoc is %I64u (0x%08x%08x)\n", ft, ft.dwHighDateTime, ft.dwLowDateTime);
60 if (FileTimeToSystemTime(&ft, &st))
61 printf("unix epoc: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
62 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
63 else
64 printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
65 }
66 else
67 printf("SystemTimeToFileTime failed, lasterr=%d\n", GetLastError());
68
69 ft.dwHighDateTime = 0;
70 ft.dwLowDateTime = 0;
71 if (FileTimeToSystemTime(&ft, &st))
72 printf("nt time start: %d-%02d-%02d %02d:%02d:%02d.%03d (week day %d)\n",
73 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);
74 else
75 printf("FileTimeToSystemTime failed, lasterr=%d\n", GetLastError());
76#endif
77 return 0;
78}
79
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