mirror of https://github.com/dahall/Vanara.git
47 lines
2.6 KiB
C#
47 lines
2.6 KiB
C#
using System.Runtime.InteropServices;
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namespace Vanara.PInvoke
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{
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public static partial class Kernel32
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{
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/// <summary>
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/// Retrieves the current value of the performance counter, which is a high resolution (<1us) time stamp that can be used for time-interval measurements.
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/// </summary>
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/// <param name="lpPerformanceCount">A pointer to a variable that receives the current performance-counter value, in counts.</param>
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/// <returns>
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/// <para>If the function succeeds, the return value is nonzero.</para>
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/// <para>
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/// If the function fails, the return value is zero. To get extended error information, call <c>GetLastError</c>. On systems that run Windows XP or
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/// later, the function will always succeed and will thus never return zero.
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/// </para>
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/// </returns>
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// BOOL WINAPI QueryPerformanceCounter( _Out_ LARGE_INTEGER *lpPerformanceCount);
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644904(v=vs.85).aspx
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[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
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[PInvokeData("Winbase.h", MSDNShortId = "ms644904")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool QueryPerformanceCounter(out long lpPerformanceCount);
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/// <summary>
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/// Retrieves the frequency of the performance counter. The frequency of the performance counter is fixed at system boot and is consistent across all
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/// processors. Therefore, the frequency need only be queried upon application initialization, and the result can be cached.
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/// </summary>
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/// <param name="lpFrequency">
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/// A pointer to a variable that receives the current performance-counter frequency, in counts per second. If the installed hardware doesn't support a
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/// high-resolution performance counter, this parameter can be zero (this will not occur on systems that run Windows XP or later).
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/// </param>
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/// <returns>
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/// <para>If the installed hardware supports a high-resolution performance counter, the return value is nonzero.</para>
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/// <para>
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/// If the function fails, the return value is zero. To get extended error information, call <c>GetLastError</c>. On systems that run Windows XP or
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/// later, the function will always succeed and will thus never return zero.
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/// </para>
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/// </returns>
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// BOOL WINAPI QueryPerformanceFrequency( _Out_ LARGE_INTEGER *lpFrequency);
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// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx
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[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
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[PInvokeData("Winbase.h", MSDNShortId = "ms644905")]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool QueryPerformanceFrequency(out long lpFrequency);
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}
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} |