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.NET Forum / .NET Framework / Interop / May 2004Leak in COM object
Hi, I am calling a third party COM object from a .NET application where I am experiencing a memory leak. I tried the same set of calls to the COM object from a VB6 application but found no leaks. In the .NET application, I have the following set of operations: - Create an instance of the RCW - Make a series of calls - Marshal.ReleaseComObject on the instance - Set the instance to null - GC.Collect() and GC.WaitForPendingFinalizers() Any inputs? -psn HI, I too am finding something similar is happening to our app. However, Ours seems to run fine in Windows App mode, but when as a service, It leaks like a rust bucket! (Aprox 8bytes per event I think). We use an ActiveX DLL that we create a COM object from, this inturn passes us events.. Sounds too easy! Any ideas? > Hi, > I am calling a third party COM object from a .NET application where I am [quoted text clipped - 10 lines] > > -psn Exactly, a windows app works fine. However, we do not have any events in our application. We are using .NET Framework v1.0. -psn > HI, > [quoted text clipped - 21 lines] > > > > -psn Hi, I actually am beginning to think it is a bug int he interop layer. Once UI read this post, I then created a simple app/service that creates 1000s of COM objects, releasing them each time. Guess what? The win app works fine, the Service consumes like a tramp with a bottle of meths! So, where do we go from here? Steve > Exactly, a windows app works fine. However, we do not have any events in our > application. We are using .NET Framework v1.0. [quoted text clipped - 28 lines] > > > > > > -psn Steve, So which version of the framework are you using? I was wondering whether moving to 1.1 would make a difference in my case. Also, can you post your test app? -psn > Hi, > [quoted text clipped - 44 lines] > > > > > > > > -psn We had a similar problem here and i read a while ago that it's a bug with com interop and .net. Set the Main method attribute to [MTAThread()] (it worked for us...) hope this helps..... Gareth > Steve, > So which version of the framework are you using? I was wondering whether [quoted text clipped - 54 lines] > > > > > > > > > > -psn Do we have a corresponding solution if we are running the application as a service or calling the COM object through ASP.NET app? -psn > We had a similar problem here and i read a while ago that it's a bug with > com interop and .net. [quoted text clipped - 69 lines] > > > > > > > > > > > > -psn Not too sure how to make ASP.NET run under a different COM threading model. sorry Gareth > Do we have a corresponding solution if we are running the application as a > service or calling the COM object through ASP.NET app? [quoted text clipped - 81 lines] > > > > > > > > > > > > > > -psn That's fine. Thaks for your solution. It seems to be working at least for my service. I wonder whether ASP.NET, by default, runs in Multi-threaded apartment model. -pranav > Not too sure how to make ASP.NET run under a different COM threading model. > [quoted text clipped - 91 lines] > > > > > > > > > > > > > > > > -psn JSPs allow you to set the threading model in the page declarations. There must be some form of directive in ASP.NET to do the same??? > Not too sure how to make ASP.NET run under a different COM threading model. > [quoted text clipped - 91 lines] > > > > > > > > > > > > > > > > -psn Seems to work for me.. Am going to test overnight and then post my working and not working solutions! Cheers Steve > We had a similar problem here and i read a while ago that it's a bug with > com interop and .net. [quoted text clipped - 69 lines] > > > > > > > > > > > > -psn Hi PSN, We are using 1.1. Did not help! Will have a go at Gareth's solution now. If all fails will post my test app code.. Steve
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