mirror of https://github.com/dahall/Vanara.git
52 lines
2.8 KiB
C#
52 lines
2.8 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
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/// 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 GetLastError. On systems that run
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/// Windows XP or 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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/// <remarks>For more info about this function and its usage, see Acquiring high-resolution time stamps.</remarks>
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// https://docs.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileapi-queryperformancecounter BOOL QueryPerformanceCounter(
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// LARGE_INTEGER *lpPerformanceCount );
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[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
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[PInvokeData("profileapi.h")]
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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
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/// consistent across all processors. Therefore, the frequency need only be queried upon application initialization, and the result
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/// 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
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/// doesn't support a high-resolution performance counter, this parameter can be zero (this will not occur on systems that run
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/// 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 GetLastError. On systems that run
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/// Windows XP or 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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/// <remarks>For more info about this function and its usage, see Acquiring high-resolution time stamps.</remarks>
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// https://docs.microsoft.com/en-us/windows/win32/api/profileapi/nf-profileapi-queryperformancefrequency BOOL
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// QueryPerformanceFrequency( LARGE_INTEGER *lpFrequency );
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[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
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[PInvokeData("profileapi.h")]
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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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} |