NativeMethods.cs

using System;
using System.Runtime.InteropServices;

namespace ProcessFreezer
{
    /// <summary>
    /// Windows API P/Invoke 定义
    /// </summary>
    public static class NativeMethods
    {
        // 进程访问权限
        public const uint PROCESS_QUERY_INFORMATION = 0x0400;
        public const uint PROCESS_SET_QUOTA = 0x0100;
        public const uint PROCESS_VM_READ = 0x0010;

        /// <summary>
        /// 清空进程工作集（将物理内存页面写入页面文件）
        /// </summary>
        [DllImport("psapi.dll", SetLastError = true)]
        public static extern bool EmptyWorkingSet(IntPtr hProcess);

        /// <summary>
        /// 打开进程句柄
        /// </summary>
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr OpenProcess(uint dwDesiredAccess, bool bInheritHandle, int dwProcessId);

        /// <summary>
        /// 关闭句柄
        /// </summary>
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool CloseHandle(IntPtr hObject);

        /// <summary>
        /// 获取进程内存信息
        /// </summary>
        [DllImport("psapi.dll", SetLastError = true)]
        public static extern bool GetProcessMemoryInfo(IntPtr hProcess, out PROCESS_MEMORY_COUNTERS counters, uint size);

        [StructLayout(LayoutKind.Sequential)]
        public struct PROCESS_MEMORY_COUNTERS
        {
            public uint cb;
            public uint PageFaultCount;
            public UIntPtr PeakWorkingSetSize;
            public UIntPtr WorkingSetSize;
            public UIntPtr QuotaPeakPagedPoolUsage;
            public UIntPtr QuotaPagedPoolUsage;
            public UIntPtr QuotaPeakNonPagedPoolUsage;
            public UIntPtr QuotaNonPagedPoolUsage;
            public UIntPtr PagefileUsage;
            public UIntPtr PeakPagefileUsage;
        }
    }
}