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ComUtils.cs (2327B)

      1 // Copyright (c) Microsoft Corporation.
      2 // Licensed under the MIT License.
      3 
      4 namespace Microsoft.Management.Deployment.Projection
      5 {
      6     using System;
      7     using System.Runtime.InteropServices;
      8 
      9     internal static class ComUtils
     10     {
     11         [DllImport("api-ms-win-core-com-l1-1-0.dll")]
     12         private static extern unsafe int CoCreateInstance(ref Guid clsid, IntPtr outer, uint clsContext, ref Guid iid, IntPtr* instance);
     13 
     14         /// <summary>
     15         /// CLSCTX enumeration
     16         /// https://docs.microsoft.com/en-us/windows/win32/api/wtypesbase/ne-wtypesbase-clsctx
     17         /// </summary>
     18         private enum CLSCTX : uint
     19         {
     20             CLSCTX_INPROC_SERVER = 0x1,
     21             CLSCTX_LOCAL_SERVER = 0x4,
     22             CLSCTX_ALLOW_LOWER_TRUST_REGISTRATION = 0x4000000
     23         }
     24 
     25         /// <summary>
     26         /// CoCreateInstance function
     27         /// https://docs.microsoft.com/en-us/windows/win32/api/combaseapi/nf-combaseapi-cocreateinstance
     28         /// </summary>
     29         /// <param name="clsid">CLSID</param>
     30         /// <param name="clsContext">CLSCTX</param>
     31         /// <param name="iid">IID</param>
     32         /// <returns>Interface pointer, or throw an exception if HRESULT was not successful.</returns>
     33         private static unsafe IntPtr CoCreateInstance(Guid clsid, CLSCTX clsContext, Guid iid)
     34         {
     35             IntPtr instanceIntPtr;
     36             int hr = CoCreateInstance(ref clsid, IntPtr.Zero, (uint)clsContext, ref iid, &instanceIntPtr);
     37             Marshal.ThrowExceptionForHR(hr);
     38             return instanceIntPtr;
     39         }
     40 
     41         /// <summary>
     42         /// CoCreateInstance with an out-of-process context.
     43         /// </summary>
     44         /// <param name="clsid">CLSID</param>
     45         /// <param name="iid">CLSCTX</param>
     46         /// <param name="allowLowerTrustRegistration">Allow lower trust registration</param>
     47         /// <returns><see cref="CoCreateInstance"/> ></returns>
     48         public static IntPtr CoCreateInstanceLocalServer(Guid clsid, Guid iid, bool allowLowerTrustRegistration = false)
     49         {
     50             CLSCTX clsctx = CLSCTX.CLSCTX_LOCAL_SERVER;
     51             if (allowLowerTrustRegistration)
     52             {
     53                 clsctx |= CLSCTX.CLSCTX_ALLOW_LOWER_TRUST_REGISTRATION;
     54             }
     55 
     56             return CoCreateInstance(clsid, clsctx, iid);
     57         }
     58     }
     59 }