///    <c>true</c> if the operation succeedes, <c>false</c> otherwise. To get extended error information, call <see cref="System.Runtime.InteropServices.Marshal.GetLastWin32Error"/>.

<Runtime.InteropServices.DllImport("gdi32.dll")> _

using System.Runtime.InteropServices;

<System.Runtime.InteropServices.DllImport("gdi32.dll")> _

using System.Runtime.InteropServices;

using System.Runtime.InteropServices;

using System.Runtime.InteropServices;

    [System.Runtime.InteropServices.DllImport("gdi32")]

    [System.Runtime.InteropServices.DllImport("gdi32")]

  using System.Runtime.InteropServices;

  using System.Runtime.InteropServices;

  using System.Runtime.InteropServices;

using System.Runtime.InteropServices;

using System.Runtime.InteropServices; // For calling Windows API functions.

using System.Runtime.InteropServices;

   using System.Runtime.InteropServices;

Imports System.Runtime.InteropServices

                      ref System.Runtime.InteropServices.ComTypes.FILETIME lpTargetFileTime,

using System.Runtime.InteropServices;

        IF_TYPE_FRAMERELAY_SERVICE = 44,  // FRNETSERV-MIB

        IF_TYPE_CES = 133,  // Circuit Emulation Service

        [System.Runtime.InteropServices.MarshalAs(UnmanagedType.LPWStr)]

        [System.Runtime.InteropServices.MarshalAs(UnmanagedType.LPWStr)]

  using System.Runtime.InteropServices;

    $services=Get-WmiObject -Namespace "root\cimv2" -Class "Win32_Service"

      $boolNoService=$true

      for ($j=0; $j -lt $services.Count; $j++) {

    if ($services[$j].ProcessId -eq $y[$i].owningPid) {

      Add-Member -InputObject $objOutput -MemberType NoteProperty -Name "ServiceName" -Value $services[$j].Caption

      $boolNoService=$false

      if ($boolNoService) { Add-Member -InputObject $objOutput -MemberType NoteProperty -Name "ServiceName" -Value $null }

    using System.Runtime.InteropServices;

    using System.Runtime.InteropServices;

    using System.Runtime.InteropServices;

    using System.Runtime.InteropServices;

FILETIME, which is defined in [System.Runtime.InteropServices] or [System.Runtime.InteropServices.ComTypes] in the .NET Framework 2.0.

FILETIME, which is defined in [System.Runtime.InteropServices] or [System.Runtime.InteropServices.ComTypes] in the .NET Framework 2.0.

[System.Runtime.InteropServices.DllImport("ole32.dll")]

   cAuthSvc As Integer, asAuthSvc() As SOLE_AUTHENTICATION_SERVICE, _

SOLE_AUTHENTICATION_SERVICE

[System.Runtime.InteropServices.DllImport("ole32.dll")]

   cAuthSvc As Integer, asAuthSvc() As SOLE_AUTHENTICATION_SERVICE, _

SOLE_AUTHENTICATION_SERVICE

Please look at http://msdn2.microsoft.com/en-us/library/aa302389.aspx#secnetch09_callingservicedcompaspnet, which shows how to call CoSetProxyBlanket in C#. As this is published on the MS Patterns and Practices web site I would assume this would be OK and is safe. This reference has code and discusses the issues about transition from .net object to COM IUnknown reference using the Marshal functions.

Please see http://msdn2.microsoft.com/en-us/library/aa302389.aspx#secnetch09_callingservicedcompaspnet

Marshal.FreeCoTaskMem http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.freecotaskmem.aspx

static extern int CoUnmarshalInterface(System.Runtime.InteropServices.ComTypes.IStream pStm, [In] ref Guid riid,

The managed definition for the IMoniker interface is available in System.Runtime.InteropServices.ComTypes

As of .NET 2.0, UCOMIMoniker is obsolete and has been replaced with System.Runtime.InteropServices.ComTypes.IMoniker. This extends to all interfaces of the System.Runtime.InteropServices namespace starting with "UCOM...". Each of them are replaced in the System.Runtime.InteropServices.ComTypes namespace, with same name, except for the "UCOM" at the beginning.

   out System.Runtime.InteropServices.ComTypes.IMoniker ppmk);

For .Net 2.0, use System.Runtime.InteropServices.ComTypes.IMoniker as the final parameter; frameworks 1.0 and 1.1 use System.Runtime.InteropServices.UCOMIMoniker.

As of .NET 2.0, UCOMIMoniker is obsolete and has been replaced with System.Runtime.InteropServices.ComTypes.IMoniker. This extends to all interfaces of the System.Runtime.InteropServices namespace starting with "UCOM...". Each of them are replaced in the System.Runtime.InteropServices.ComTypes namespace, with same name, except for the "UCOM" at the beginning.

   punk, out System.Runtime.InteropServices.ComTypes.IMoniker ppmk);

       [System.Runtime.InteropServices.DllImport("OLE32.DLL", EntryPoint = "CreateStreamOnHGlobal")] // Create a COM stream from a pointer in unmanaged memory

    extern public static int CreateStreamOnHGlobal(IntPtr ptr, bool delete, out System.Runtime.InteropServices.ComTypes.IStream pOutStm);

    [System.Runtime.InteropServices.DllImport("OLE32.DLL", EntryPoint = "GetHGlobalFromStream")]

       out System.Runtime.InteropServices.ComTypes.IRunningObjectTable pprot);

In .Net 2.0 use System.Runtime.InteropServices.ComTypes.IRunningObjectTabl as the second parameter. Frameworks 1.0 and 1.1 use a now deprecated type.

     System.Runtime.InteropServices.ComTypes.IRunningObjectTable objTbl;

I find it better to turn off [PreserveSig] for methods that return an HRESULT and have a trailing out parameter, providing that the HRESULT does not have more that one success code (typically S_OK only). This results in a slightly cleaner syntax where the out parameter becomes the return value and a failing HRESULT results in an exception.

using System.Runtime.InteropServices;

I find it better to turn off [PreserveSig] for methods that return an HRESULT and have a trailing out parameter, providing that the HRESULT does not have more that one success code (typically S_OK only). This results in a slightly cleaner syntax where the out parameter becomes the return value and a failing HRESULT results in an exception.

static extern int OleLoadFromStream(System.Runtime.InteropServices.ComTypes.IStream pStm,

static extern int OleLoadFromStream(System.Runtime.InteropServices.ComTypes.IStream pStm,

      [System.Runtime.InteropServices.DllImport("OLE32.DLL", EntryPoint = "CreateStreamOnHGlobal")]

    extern public static int CreateStreamOnHGlobal(IntPtr ptr, bool delete, out System.Runtime.InteropServices.ComTypes.IStream pOutStm);

        System.Runtime.InteropServices.ComTypes.STATSTG fileinfo;

    [System.Runtime.InteropServices.DllImport("OLE32.DLL", EntryPoint = "CreateStreamOnHGlobal")]

    extern public static int CreateStreamOnHGlobal(IntPtr ptr, bool delete, out System.Runtime.InteropServices.ComTypes.IStream pOutStm);

        System.Runtime.InteropServices.ComTypes.STATSTG fileinfo;

Public Shared Function OleSetClipboard(ByVal pDataObj As System.Runtime.InteropServices.ComTypes.IDataObject) As Int32

I find it better to turn off [PreserveSig] for methods that return an HRESULT and have a trailing out parameter, providing that the HRESULT does not have more that one success code (typically S_OK only). This results in a slightly cleaner syntax where the out parameter becomes the return value and a failing HRESULT results in an exception.

You can use this to query product codes from a Windows Service running under the local system account.

using System.Runtime.InteropServices;

using System.Runtime.InteropServices;

    <System.Runtime.InteropServices.DllImport("credui.dll", EntryPoint:="CredUIPromptForWindowsCredentials", CharSet:=CharSet.Unicode)> <CLSCompliant(False)> _

    SCARD_E_NO_SERVICE =        0x8010001D,

    SCARD_E_SERVICE_STOPPED =       0x8010001E,

        request.cbPciLength = System.Runtime.InteropServices.Marshal.SizeOf(typeof(UnsafeNativeMethods.SCARD_IO_REQUEST));

using System.Runtime.InteropServices;

Imports System.Runtime.InteropServices

Imports System.Runtime.InteropServices

    int dwServiceMask;

    Dim dwServiceMask As Integer

   <System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)> _

using System.Runtime.InteropServices;