C# Signature:

[DllImport( "advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, EntryPoint = "QueryServiceConfig2W" )]
public static extern Boolean QueryServiceConfig2( IntPtr hService, UInt32 dwInfoLevel, IntPtr buffer, UInt32 cbBufSize, out UInt32 pcbBytesNeeded );

VB.NET Signature:

<DllImport("advapi32.dll", CharSet:=CharSet.Unicode, SetLastError:=True)> _
Shared Function QueryServiceConfig2(ByVal hService As IntPtr, ByVal dwInfoLevel As Integer, ByVal buffer As IntPtr, ByVal cbBufSize As Integer, ByRef pcbBytesNeeded As Integer) As Boolean
End Function

VB Signature:

Declare Function QueryServiceConfig2 Lib "advapi32.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

None.

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

using System;

using System.Runtime.InteropServices;

using System.Text;

    static void Main( string [] args )
    {
        // Use the service name and *NOT* the display name.
        string serviceName = "Dnscache"; // Display name is "DNS Client"
        if ( args.Length > 0 )
            serviceName = args [ 0 ];
        IntPtr databaseHandle = OpenSCManager( null, null, SC_MANAGER_ALL_ACCESS );
        if ( databaseHandle == IntPtr.Zero )
            throw new System.Runtime.InteropServices.ExternalException( "Error OpenSCManager\n" );

        IntPtr serviceHandle = OpenService( databaseHandle, serviceName, SERVICE_QUERY_CONFIG );
        if ( serviceHandle == IntPtr.Zero )
            throw new System.Runtime.InteropServices.ExternalException( "Error OpenService\n" );

        ReportDescription( serviceHandle );
        ReportFailureActions( serviceHandle );
    }

    static private void ReportDescription( IntPtr serviceHandle )
    {
        UInt32 dwBytesNeeded;

        // Determine the buffer size needed
        bool sucess = QueryServiceConfig2( serviceHandle, SERVICE_CONFIG_DESCRIPTION, IntPtr.Zero, 0, out dwBytesNeeded );

        IntPtr ptr = Marshal.AllocHGlobal( ( int )dwBytesNeeded );
        sucess = QueryServiceConfig2( serviceHandle, SERVICE_CONFIG_DESCRIPTION, ptr, dwBytesNeeded, out dwBytesNeeded );
        SERVICE_DESCRIPTION descriptionStruct = new SERVICE_DESCRIPTION();
        Marshal.PtrToStructure( ptr, descriptionStruct );
        Marshal.FreeHGlobal( ptr );

        // Report it.
        Console.WriteLine( descriptionStruct.lpDescription );
    }

    static private void ReportFailureActions( IntPtr serviceHandle )
    {
        UInt32 dwBytesNeeded;
        const UInt32 INFINITE = 0xFFFFFFFF;

        // Determine the buffer size needed
        bool sucess = QueryServiceConfig2( serviceHandle, SERVICE_CONFIG_FAILURE_ACTIONS, IntPtr.Zero, 0, out dwBytesNeeded );

        IntPtr ptr = Marshal.AllocHGlobal( ( int )dwBytesNeeded );
        sucess = QueryServiceConfig2( serviceHandle, SERVICE_CONFIG_FAILURE_ACTIONS, ptr, dwBytesNeeded, out dwBytesNeeded );
        SERVICE_FAILURE_ACTIONS failureActions = new SERVICE_FAILURE_ACTIONS();
        Marshal.PtrToStructure( ptr, failureActions );

        // Report it.
        Console.WriteLine( "Reset Period: {0}", ( UInt32 )failureActions.dwResetPeriod != INFINITE
            ? failureActions.dwResetPeriod.ToString() : "INFINITE" );
        Console.WriteLine( "Reboot message: {0}", failureActions.lpRebootMsg );
        Console.WriteLine( "Command line: {0}", failureActions.lpCommand );
        Console.WriteLine( "Number of actions: {0}", failureActions.cActions );

        SC_ACTION [] actions = new SC_ACTION [ failureActions.cActions ];
        int offset = 0;
        for ( int i = 0; i < failureActions.cActions; i++ )
        {
            SC_ACTION action = new SC_ACTION();
            action.type = Marshal.ReadInt32( failureActions.lpsaActions, offset );
            offset += sizeof( Int32 );
            action.dwDelay = ( UInt32 )Marshal.ReadInt32( failureActions.lpsaActions, offset );
            offset += sizeof( Int32 );
            actions [ i ] = action;
        }

        Marshal.FreeHGlobal( ptr );

        foreach ( SC_ACTION action in actions )
        {
            Console.WriteLine( "Type: {0}, Delay (msec): {1}", action.type, action.dwDelay );
        }
    }

    #region P/Invoke declarations
    [StructLayout( LayoutKind.Sequential )]
    public class SERVICE_DESCRIPTION
    {
        [MarshalAs( System.Runtime.InteropServices.UnmanagedType.LPWStr )]
        public String lpDescription;
    }

    [StructLayout( LayoutKind.Sequential, CharSet = CharSet.Unicode )]
    public class SERVICE_FAILURE_ACTIONS
    {
        public int dwResetPeriod;
        [MarshalAs( UnmanagedType.LPWStr )]
        public string lpRebootMsg;
        [MarshalAs( UnmanagedType.LPWStr )]
        public string lpCommand;
        public int cActions;
        public IntPtr lpsaActions;
    }

    [StructLayout( LayoutKind.Sequential )]
    public class SC_ACTION
    {
        public Int32 type;
        public UInt32 dwDelay;
    }

    [DllImport( "advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true )]
    public static extern IntPtr OpenSCManager( String lpMachineName, String lpDatabaseName, UInt32 dwDesiredAccess );
    [DllImport( "advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true )]
    public static extern IntPtr OpenService( IntPtr hSCManager, String lpServiceName, UInt32 dwDesiredAccess );
    [DllImport( "advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, EntryPoint = "QueryServiceConfig2W" )]
    public static extern Boolean QueryServiceConfig2( IntPtr hService, UInt32 dwInfoLevel, IntPtr buffer, UInt32 cbBufSize, out UInt32 pcbBytesNeeded );

    private const Int32 SC_MANAGER_ALL_ACCESS = 0x000F003F;
    private const Int32 SERVICE_QUERY_CONFIG = 0x00000001;
    private const UInt32 SERVICE_CONFIG_DESCRIPTION = 0x01;
    private const UInt32 SERVICE_CONFIG_FAILURE_ACTIONS = 0x02;

    #endregion // P/Invoke declarations

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).