ServiceControlManager.cs

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using Waher.IoTGateway.Svc.ServiceManagement.Enumerations;
using Waher.IoTGateway.Svc.ServiceManagement.Structures;
 
namespace Waher.IoTGateway.Svc.ServiceManagement.Classes
{
    internal class ServiceControlManager : SafeHandle
    {
        internal ServiceControlManager() : base(IntPtr.Zero, ownsHandle: true)
        {
        }
 
        protected override bool ReleaseHandle()
        {
            return Win32.CloseServiceHandle(this.handle);
        }
 
        public override bool IsInvalid
        {
            [System.Security.SecurityCritical]
            get
            {
                return this.handle == IntPtr.Zero;
            }
        }
 
        internal static ServiceControlManager Connect(string machineName, string databaseName, ServiceControlManagerAccessRights desiredAccessRights)
        {
            ServiceControlManager mgr = Win32.OpenSCManagerW(machineName, databaseName, desiredAccessRights);
 
            if (mgr.IsInvalid)
                throw new Win32Exception(Marshal.GetLastWin32Error());
 
            return mgr;
        }
 
        public ServiceHandle CreateService(string serviceName, string displayName, string binaryPath, ServiceType serviceType, ServiceStartType startupType, ErrorSeverity errorSeverity, Win32ServiceCredentials credentials)
        {
            ServiceHandle service = Win32.CreateServiceW(this, serviceName, displayName, ServiceControlAccessRights.All, serviceType, startupType, errorSeverity,
                binaryPath, null, IntPtr.Zero, null, credentials.UserName, credentials.Password);
 
            if (service.IsInvalid)
                throw new Win32Exception(Marshal.GetLastWin32Error());
 
            return service;
        }
 
        public ServiceHandle OpenService(string serviceName, ServiceControlAccessRights desiredControlAccess)
        {
            if (!this.TryOpenService(serviceName, desiredControlAccess, out ServiceHandle service, out Win32Exception errorException))
                throw errorException;
 
            return service;
        }
 
        public virtual bool TryOpenService(string serviceName, ServiceControlAccessRights desiredControlAccess, out ServiceHandle serviceHandle, 
            out Win32Exception errorException)
        {
            ServiceHandle service = Win32.OpenServiceW(this, serviceName, desiredControlAccess);
 
            if (service.IsInvalid)
            {
                errorException = new Win32Exception(Marshal.GetLastWin32Error());
                serviceHandle = null;
                return false;
            }
 
            serviceHandle = service;
            errorException = null;
            return true;
        }
    }
}