private void Dispose(bool disposing)
        {
            if (dwUnionChoice == UnionChoice.File)
            {
                WINTRUST_FILE_INFO info = new WINTRUST_FILE_INFO();

                Marshal.PtrToStructure(pInfoStruct, info);

                info.Dispose();

                Marshal.DestroyStructure(pInfoStruct, typeof(WINTRUST_FILE_INFO));
            }

            Marshal.FreeHGlobal(pInfoStruct);
        }
 public WINTRUST_DATA(WINTRUST_FILE_INFO fileInfo)
 {
     this.cbStruct = (uint)Marshal.SizeOf(typeof(WINTRUST_DATA));
     pInfoStruct   = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WINTRUST_FILE_INFO)));
     Marshal.StructureToPtr(fileInfo, pInfoStruct, false);
     this.dwUnionChoice  = UnionChoice.File;
     pPolicyCallbackData = IntPtr.Zero;
     pSIPCallbackData    = IntPtr.Zero;
     dwUIChoice          = UiChoice.NoUI;
     fdwRevocationChecks = RevocationCheckFlags.None;
     dwStateAction       = StateAction.Ignore;
     hWVTStateData       = IntPtr.Zero;
     pwszURLReference    = IntPtr.Zero;
     dwProvFlags         = TrustProviderFlags.Safer;
     dwUIContext         = UIContext.Execute;
 }
        private static uint WinVerifyTrust(string fileName)
        {
            Guid wintrust_action_generic_verify_v2 = new Guid("{00AAC56B-CD44-11d0-8CC2-00C04FC295EE}");
            uint result = 0;

            using (WINTRUST_FILE_INFO fileInfo = new WINTRUST_FILE_INFO(fileName, Guid.Empty))
                using (UnmanagedPointer guidPtr = new UnmanagedPointer(Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Guid))), AllocMethod.HGlobal))
                    using (UnmanagedPointer wvtDataPtr = new UnmanagedPointer(Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WINTRUST_DATA))), AllocMethod.HGlobal))
                    {
                        WINTRUST_DATA data  = new WINTRUST_DATA(fileInfo);
                        IntPtr        pGuid = guidPtr;
                        IntPtr        pData = wvtDataPtr;
                        Marshal.StructureToPtr(wintrust_action_generic_verify_v2, pGuid, true);
                        Marshal.StructureToPtr(data, pData, true);
                        result = WinVerifyTrust(IntPtr.Zero, pGuid, pData);
                    }
            return(result);
        }