如何在 .NET 中透過 P/Invoke 使用 CreateJobObject 和 SetInformationJobObject
CreateJob 和 SetInformation 作業函數,允許您32工作程式物件。作業物件是一種管理進程組並控制其資源的機制。它們可用於建立各種效果,例如防止流程相互終止或限制其對資源的存取。
要在 .NET 中將 CreateJobObject 和 SetInformationJobObject 與 P/Invoke 一起使用,您需要聲明以下函數和結構:
[DllImport("kernel32.dll", CharSet = CharSet.Unicode)] static extern IntPtr CreateJobObject(IntPtr a, string lpName); [DllImport("kernel32.dll")] static extern bool SetInformationJobObject(IntPtr hJob, JobObjectInfoType infoType, IntPtr lpJobObjectInfo, UInt32 cbJobObjectInfoLength); [DllImport("kernel32.dll", SetLastError = true)] static extern bool AssignProcessToJobObject(IntPtr job, IntPtr process); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool CloseHandle(IntPtr hObject); private IntPtr handle; private bool disposed;
CreateJobObject 函數建立一個新的作業物件。 SetInformationJobObject 函數設定作業物件的資訊。 AssignProcessToJobObject 函數將行程指派給作業物件。 CloseHandle 函數關閉作業物件的句柄。
以下程式碼範例向您展示如何使用這些函數建立作業對象、設定其資訊並為其分配進程:
using System; using System.Diagnostics; using System.Runtime.InteropServices; namespace JobManagement { public class Job : IDisposable { public Job() { handle = CreateJobObject(IntPtr.Zero, null); var info = new JOBOBJECT_BASIC_LIMIT_INFORMATION { LimitFlags = 0x2000 }; var extendedInfo = new JOBOBJECT_EXTENDED_LIMIT_INFORMATION { BasicLimitInformation = info }; int length = Marshal.SizeOf(typeof(JOBOBJECT_EXTENDED_LIMIT_INFORMATION)); IntPtr extendedInfoPtr = Marshal.AllocHGlobal(length); Marshal.StructureToPtr(extendedInfo, extendedInfoPtr, false); if (!SetInformationJobObject(handle, JobObjectInfoType.ExtendedLimitInformation, extendedInfoPtr, (uint)length)) throw new Exception(string.Format("Unable to set information. Error: {0}", Marshal.GetLastWin32Error())); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } private void Dispose(bool disposing) { if (disposed) return; if (disposing) { } Close(); disposed = true; } public void Close() { CloseHandle(handle); handle = IntPtr.Zero; } public bool AddProcess(IntPtr processHandle) { return AssignProcessToJobObject(handle, processHandle); } public bool AddProcess(int processId) { return AddProcess(Process.GetProcessById(processId).Handle); } } #region Helper classes [StructLayout(LayoutKind.Sequential)] struct IO_COUNTERS { public UInt64 ReadOperationCount; public UInt64 WriteOperationCount; public UInt64 OtherOperationCount; public UInt64 ReadTransferCount; public UInt64 WriteTransferCount; public UInt64 OtherTransferCount; } [StructLayout(LayoutKind.Sequential)] struct JOBOBJECT_BASIC_LIMIT_INFORMATION { public Int64 PerProcessUserTimeLimit; public Int64 PerJobUserTimeLimit; public UInt32 LimitFlags; public UIntPtr MinimumWorkingSetSize; public UIntPtr MaximumWorkingSetSize; public UInt32 ActiveProcessLimit; public UIntPtr Affinity; public UInt32 PriorityClass; public UInt32 SchedulingClass; } [StructLayout(LayoutKind.Sequential)] public struct SECURITY_ATTRIBUTES { public UInt32 nLength; public IntPtr lpSecurityDescriptor; public Int32 bInheritHandle; } [StructLayout(LayoutKind.Sequential)] struct JOBOBJECT_EXTENDED_LIMIT_INFORMATION { public JOBOBJECT_BASIC_LIMIT_INFORMATION BasicLimitInformation; public IO_COUNTERS IoInfo; public UIntPtr ProcessMemoryLimit; public UIntPtr JobMemoryLimit; public UIntPtr PeakProcessMemoryUsed; public UIntPtr PeakJobMemoryUsed; } public enum JobObjectInfoType { AssociateCompletionPortInformation = 7, BasicLimitInformation = 2, BasicUIRestrictions = 4, EndOfJobTimeInformation = 6, ExtendedLimitInformation = 9, SecurityLimitInformation = 5, GroupInformation = 11 } #endregion }
此程式碼範例建立作業對象,設定其資訊以防止程序相互終止,並將目前程序指派給該作業物件。
以上是如何在.NET中使用CreateJobObject和SetInformationJobObject來管理進程和控制資源?的詳細內容。更多資訊請關注PHP中文網其他相關文章!