Thread: DCOM Server - Memory keeps growing

I have a DCOM executable which is a server program written in C++. The client is a VB program which calls the methods from DCOM. When the first client makes the call to DCOM, the DCOM executable is started on the server side and its initial memory size is 20,000K. The memory keeps growing when ever any client calls a DCOM method. In C++ code, I call QueryInterface(...), AddRef() and I release pointer to Interface by calling Release(..), but the memory still keeps growing for every call to DCOM method.

Why is this?

When each client disconnect from DCOM server, the memory on server side is not release, but only when the last client disconnects, the DCOM executable is stopped which is fine.

How can I keep the memory on server side not grow when clients are making calls to DCOM interface?

Is there anybody that can help me with this.

tx.

Need a little more info before I can offer any help. What does the object you implemented do? Was it implementated using ATL, MFC, or plain C++? Actual code would be great.

The code is written using ATL COM Wizard.

Here is the method that is called to connect to the DCOM server:

STDMETHODIMP CConnector::Connect(long* User, IFeedback **MyFeedback, IGrid **TheGrid)
{
// TODO: Add your implementation code here
MyGrid.QueryInterface(IID_IGrid, (void**)TheGrid);

*User = MyGrid.CurrentUser++;

MyGrid.AddRef();
MyGrid.Feedbacks[*User].vt = VT_DISPATCH;
IDispatch* pDisp;
(*MyFeedback)->QueryInterface(IID_IDispatch, (void**)&pDisp);
(*MyFeedback)->AddRef(); //mustafica: FIX
(*MyFeedback)->Release(); //mustafica: FIX

MyGrid.Feedbacks[*User].pdispVal = pDisp;

return S_OK;
}


When the client calls the following method in DCOM Server the memory grows 200K first time and about 60K every other time. I think I properly release all the memory but then again you guys might know better.....here is the code:

STDMETHODIMP CGrid::FindDefaultGroup(int Client, int Call_Type, int User)
{
// TODO: Add your implementation code here
CdboFindDefaultGroup* DefaultGroup = new CdboFindDefaultGroup;

DefaultGroup->m_calltype = Call_Type;
DefaultGroup->m_client = Client;

(*Feedbacks[User].pdispVal).QueryInterface(IID_IFeedback, (void**)TheFeedback);
(*Feedbacks[User].pdispVal).AddRef(); //mustafica: FIX

if (DefaultGroup->Open() == S_OK)
{
DefaultGroup->MoveFirst();
(*TheFeedback)->DefaultGroup(DefaultGroup->m_colHuntGroup);
}
else
(*TheFeedback)->DefaultGroup(0);

DefaultGroup->Close();
delete DefaultGroup;


(*Feedbacks[User].pdispVal).Release();


return S_OK;
}


I debugged the code and I notice that memory grows when QueryInterface function is called.

Your help is appreciated.

Thanks.

Freestyle.