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POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
 

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  1. POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
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    <p>I have a DLL Com Server, actually used only by one old Delphi exe-application. </p> <p>COM Server is written many years ago (not by me) in C++ ATL. It implements callbacks (event - is it the same?) - using outgoing interface <code>IConnectionPointImpl</code>. Class Factory is singleton (marked with <code>DECLARE_CLASSFACTORY_SINGLETON</code>)</p> <p>Now it is required that this COM Server have to be shared between more than one clients: both Delphi and C# (.NET 2.0, VS2008). I put it as <code>DllSurrogate</code> and now I can use it from multiple Delphi clients, using class inherited from <code>TOleServer</code>, overriding <code>GetServer</code> method to use always <code>CoCreateInstance</code> (because <code>GetActiveObject</code> usually fails) and it's working.</p> <p>Now I need to consume it from C# WinService and I don't know from where to start. I wrote a little C# Hello-world which use WinApi <code>CoCreateInstance</code> and <code>DllImport("ole32.dll")</code> - I am able to connect to existing instance from COM Server but cannot subscribe to events.</p> <p>Here is the DLL META-DATA imported by VS: <img src="https://i.stack.imgur.com/jFQnL.png" alt="enter image description here"></p> <p>I don't know if this is correct way. Here is aproximative code: </p> <pre><code>using System; using System.Collections.Generic; using System.Text; using SWLMLib; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; namespace TestSWLM { [Flags] enum CLSCTX : uint { //... defines here CLSCTX } class Program { [DllImport("ole32.dll", EntryPoint = "CoCreateInstance", CallingConvention = CallingConvention.StdCall)] static extern UInt32 CoCreateInstance([In, MarshalAs(UnmanagedType.LPStruct)] Guid rclsid, IntPtr pUnkOuter, UInt32 dwClsContext, [In, MarshalAs(UnmanagedType.LPStruct)] Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out object rReturnedComObject); public static void AboutExpireHandler(IFeature pFeature, int HoursRemained) { Console.WriteLine("AboutExpireHandler, pFeature = {0}", pFeature.Code); } static void Main(string[] args) { try { SWLMLib.ISWMgr lintfSWLMgr = null; object instance = null; UInt32 dwRes = CoCreateInstance(new Guid("8EAAFAD7-73F8-403B-A53B-4400E16D8EDF"), IntPtr.Zero, (uint)CLSCTX.CLSCTX_LOCAL_SERVER, new Guid("00000000-0000-0000-C000-000000000046"), out instance); SWLMLib.SWMgrClass lSWLMgr = null; unsafe { lintfSWLMgr = (instance as SWLMLib.ISWMgr); Type liType = instance.GetType(); } if (lintfSWLMgr != null) { IntPtr iuknw = Marshal.GetIUnknownForObject(lintfSWLMgr); IntPtr ipointer = IntPtr.Zero; Guid lICPCGuid = typeof(IConnectionPointContainer).GUID; Guid lICPGuid = typeof(IConnectionPoint).GUID; Guid lIEv = new Guid("{C13A9D38-4BB0-465B-BF4A-487F371A5538}"); IConnectionPoint lCP = null; IConnectionPointContainer lCPC = null; Int32 r = Marshal.QueryInterface(iuknw, ref lICPCGuid, out ipointer); lCPC = (IConnectionPointContainer)Marshal.GetObjectForIUnknown(ipointer); lCPC.FindConnectionPoint(ref lIEv, out lCP); Int32 outID; lCP.Advise(???, out outID); // HERE I don't know what to do further lIEvEv.FeatureAboutToExpire += AboutExpireHandler; } } catch (Exception E) { Console.WriteLine(E.Message); throw; } Console.ReadLine(); } } } </code></pre> <p>Any Advices, links and know-hows are welcome. </p>
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      1. POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
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    1. COYou're looking for "COM Interop" A quick Google Search of that term will get you everything you need.
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      1. POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
      1. USRobert Harvey
    2. CO@RobertHarvey, I was searching for them all this day - there too many ways, or at least 2: Raw (using WinAPI) and Importing TLB wrapping COM Class - i don't know which is good for my scope, epsecially DLL Surrogate
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      1. POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
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    3. COIf you have a TLB, this is the way to go, just add add a reference, and choose the TLB (using the COM tab in the Visual Studio Add Reference dialog box).
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      1. POHow to Consume COM Server (ATL, DLL Surrogate) in .NET C# WinService?
      1. USSimon Mourier
 

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