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12.17.2007 at 04:37AM PST, ID: 23027706
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7.4

Memory leak like behavior

Asked by ChristophMurczek in Microsoft Visual C#.Net, Visual Studio, .NET Framework 2.x

Tags: , ,

Hi experts,
I have a memory leak like problem with one of my apps. The snippet shows a WindowsForms base PoC of my WindowsService I use to find the source of the problem. It basically goes like this:
 *) create a COM object
 *) connect to server and log on
 *) call a method to get another COM object (returns an interface) and register for events of that object
 *) call a method of the second object to get a third COM object to work with

In the event handler
 *) check the type of event
 *) depending on the state do some action

As you might have guessed, everything that is preceded by "SDK" is an interop object. The problem is that for some reason my app uses more and more memory (app. 500kB per 30 min). It got better ( by app. a factor of 3) when I moved the scope of the Agent and AgentBase object from the event handler to the class, but it still leaks. I would have expected the GC to collect the managed and unmanaged object when calling Marshal.FinalReleaseComObject(object) but appearantly it doesn't!

The interop assembly I use to access the COM based SDK is created via TlbImp.exe. I also tried referencing directly from VS, but it makes no difference. The COM SDK is developed by an external company. They wouldn't provide an interop assembly. I think I'm starting to see why...  ;-)

Any ideas what I can do? I don't want to go into re-writing the interop layer since this would cause a major delay for my customer.

Thx in advance,
ChristophStart Free Trial 
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SDK.InteropObjectClass myInteropObject;
SDK.IOtherComObject myOtherComObject;
SDK.IAgent2 myAgent;
SDK.IMediaBase myAgentBase;
 
public Form1()
{
     InitializeComponent();
 
     myInteropObject = new SDK.InteropObjectClass();
     myInteropObject.Initialize(serveraddress, localport);
     myInteropObject.Logon(user, password);
     myOtherComObject = InteropObject.GetOtherObject() as IOtherComObject;
     myOtherComObject.EventOccurred += new SDK._IOtherComObjectEvents_EventOccurredEventHandler(myOtherComObject_EventOccurred);
     myAgent = myOtherComObject.NewAgent() as SDK.IAgent2;
}
 
void myOtherComObject_EventOccurred(SDK.ComEvent ComEvent)
{
     switch (ComEvent.Code)
     {
          case ComEventCode_AgentStatus:
          {
                SDK.AgentStatusEvent myAgentStatusEvent = ComEvent as SDK.AgentStatusEvent;
 
                myAgent.Key = myAgentKey;
                myAgentBase = myAgent as SDK.MediaBase;
                myMediaManager.Query(ref myAgentBase);
                System.Threading.Thread.Sleep(500);
                switch (myAgentStatusEvent.State)
                {
                     case SDK.enStates.State_Available:
                      {
                             myAgent.Unavailable(0);
                             break;
                      }
                      case SDK.enACDStates.ACDState_Unavailable:
                      {
                             myAgent.Available();
                             break;
                      }
                }
                RefCount = Marshal.FinalReleaseComObject(myAgentStatusEvent);
                break;
          }
     }
     RefCount = Marshal.FinalReleaseComObject(ComEvent);
}
 
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
     myOtherComObject.EventOccurred -= new SDK._IOtherComObjectEvents_EventOccurredEventHandler(myOtherComObject_EventOccurred);
 
     RefCount = Marshal.FinalReleaseComObject(myAgentBase);
     RefCount = Marshal.FinalReleaseComObject(myAgent);
     RefCount = Marshal.ReleaseComObject(myOtherComObject);
     RefCount = Marshal.ReleaseComObject(myInteropObject);
}
 
Keywords: Memory leak like behavior
Title
1 Memory Leak
2 Testing Windows Service for memory l…
3 Windows 2003 winlogon.exe mem…
4 Memory leak in store.exe with excha…
5 memory leak
6 Memory leak
 
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[+][-]12.17.2007 at 04:48AM PST, ID: 20484336

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[+][-]12.19.2007 at 07:16AM PST, ID: 20500070

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[+][-]12.19.2007 at 09:26AM PST, ID: 20501174

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About this solution

Zones: Microsoft Visual C#.Net, Visual Studio, .NET Framework 2.x
Tags: memory, interop, leak
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Solution Provided By: ChristophMurczek
Participating Experts: 2
Solution Grade: B
 
 
[+][-]01.04.2008 at 04:14AM PST, ID: 20581357

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