如何在 Windows 10 2004 中将计时器分辨率重置为默认值？

Question

我使用以下方法成功地将时间分辨率更改为 0.5ms：

#include <Windows.h>

extern "C" NTSYSAPI NTSTATUS NTAPI NtSetTimerResolution(ULONG DesiredResolution, BOOLEAN SetResolution, PULONG CurrentResolution);
extern "C" NTSYSAPI NTSTATUS NTAPI NtQueryTimerResolution(OUT PULONG MinimumResolution, OUT PULONG MaximumResolution, OUT PULONG CurrentResolution);

ULONG minimum_resolution;
ULONG maximum_resolution;
ULONG current_resolution;
NtQueryTimerResolution(&minimum_resolution, &maximum_resolution, &current_resolution);
NtSetTimerResolution(maximum_resolution, TRUE, &current_resolution);

但是，我无法将其恢复到其原始值 156250。

我的尝试：

NtQueryTimerResolution(&minimum_resolution, &maximum_resolution, &current_resolution);

std::cout << "minimum = " << minimum_resolution << "\nmaximum = " << maximum_resolution << "\ncurrent = " << current_resolution << "\n";

auto result = NtSetTimerResolution(minimum_resolution, FALSE, &current_resolution);

std::cout << "after setting using FALSE, current = " << current_resolution << "\n";

NtQueryTimerResolution(&minimum_resolution, &maximum_resolution, &current_resolution);

std::cout << "now, minimum = " << minimum_resolution << "\nmaximum = " << maximum_resolution << "\ncurrent = " << default_resolution << "\n";

result = NtSetTimerResolution(minimum_resolution, TRUE, &current_resolution);

std::cout << "after setting using TRUE, current = " << current_resolution << "\n";

产生以下输出：

minimum = 156250
maximum = 5000
current = 4999
after setting using FALSE, current = 9999
now, minimum = 156250
maximum = 5000
current = 9999
after setting using TRUE, current = 9999

奇怪的是，9999 的值并没有持续存在； 连续调用产生相同的输出（不使用第一个代码块设置计时器）； 即使重新启动也不会恢复任何东西。 我已确保 Visual Studio 和浏览器已关闭。 使用 timeBeginPeriod 和 timeEndPeriod 也没有任何作用。

Answer 1

请拨打NtQueryTimerResolution后再次NtSetTimerResolution ，然后打印日志。

此外，最好检查函数的结果。