Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

ActiveX/COM Problem

Posted on 1998-03-18
3
Medium Priority
?
342 Views
Last Modified: 2013-11-19
I'm creating a chartfx component in a in proc com server:
      m_Chart.Create("ChartFx", WS_VISIBLE | WS_CHILD | WS_BORDER, aRect, this, IDR_CHART1);
      m_Chart.SetType(SCATTER | CT_TRACKMOUSE | CT_COLORLINE | CT_PAINTMARKER | CT_TOOL);
      m_Chart.SetWindowPos(0, 0, 0, aRect.Width(), aRect.Height(), SWP_NOMOVE | SWP_NOZORDER);

when I close the app, here's the call stack:
NTDLL! 77f76148()
NTDLL! 77f8a8b9()
NTDLL! 77f83209()
KERNEL32! 77f11ad0()
CFX32! 0277c496()
USER32! 77e71ab7()
USER32! 77e71a77()
NTDLL! 77f7624f()
CFX32! 02771c05()
COleDispatchDriver::~COleDispatchDriver() line 80 + 15 bytes
COleControlSite::~COleControlSite() line 99 + 33 bytes
COleControlSite::`scalar deleting destructor'(unsigned int 1) + 15 bytes
COleControlContainer::~COleControlContainer() line 120 + 31 bytes
COleControlContainer::`scalar deleting destructor'(unsigned int 1) + 15 bytes
CWnd::OnDestroy() line 764 + 34 bytes
CWnd::OnWndMsg(unsigned int 2, unsigned int 0, long 0, long * 0x0012f678) line 1815
CWnd::WindowProc(unsigned int 2, unsigned int 0, long 0) line 1575 + 30 bytes

When I QueryInterface I do a Release so the reference count should be 1.

I'm doing the same with formula1 and have no problems.  

Anyone know why the ReleaseDispatch() is being called before any of the destructor methods?
0
Comment
Question by:richp
  • 2
3 Comments
 
LVL 15

Expert Comment

by:Tommy Hui
ID: 1317056
When you do a QueryInterface(), which interface do you release?
0
 

Author Comment

by:richp
ID: 1317057
     m_pVolSurf = GetETSControl(lpUnk, &lpContext);
      lpContext->Release();
....
VolSurface * CVolatilityCtl::GetETSControl(      IUnknown* pUnk, ISnapInMarketSet** ppETSCtrl)
{
      _ASSERTE(pUnk);
      if (!pUnk || pUnk->QueryInterface(IID_IMarketSet_SnapIn, (LPVOID*) ppETSCtrl) != S_OK)
            return NULL;

0
 
LVL 15

Accepted Solution

by:
Tommy Hui earned 600 total points
ID: 1317058
I think there's a problem in this code:

  m_pVolSurf = GetETSControl(lpUnk, &lpContext);
  lpContext->Release();

You are calling GetETSControl() to retrieve the IID_IMarketSet_SnapIn interface. However, as soon as the GetETSControl function returns, you are release the interface that was returned. The code should be

  m_pVolSurf = GetETSControl(lpUnk, &lpContext);
  lpUnk->Release();  // << new stuff here
  lpUnk = NULL; // << new stuff here

I think this is what you want.


0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This is to be the first in a series of articles demonstrating the development of a complete windows based application using the MFC classes.  I’ll try to keep each article focused on one (or a couple) of the tasks that one may meet.   Introductio…
Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…
Suggested Courses
Course of the Month10 days, 4 hours left to enroll

927 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question