camshifttrackerpropertypage.cpp

guide and some example with visualC++

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// ////////////////////////////////////////////////////////////////////////////
//
// CamShiftTrackerPropertyPage
//
// This is a property page for the COM wrapper for the OpenCV CamShift tracker.
// This is intended as sample code only. It only supports calibration of
// the tracker.
// A complete implementation would have additional controls to control the
// CamShift tracker.
//
// ////////////////////////////////////////////////////////////////////////////

#include <string>
#include <stdio.h>
#include <streams.h>
#include <initguid.h>
#include "autorelease.h"
#include "ITracker3dFilter.h"
#include "ICamShiftTracker.h"
#include "CamShiftTrackerPropertyPage.h"
#include "resource.h"

//
// CreateInstance
//
// Used by the DirectShow base classes to create instances
//
CUnknown *CamShiftTrackerPropertyPage::CreateInstance(IUnknown *outer, HRESULT *phr)
{
    CUnknown *punk = new CamShiftTrackerPropertyPage(outer, phr);
    if (punk == NULL) {
        *phr = E_OUTOFMEMORY;
    }
    return punk;

}

//
// Constructor
//
CamShiftTrackerPropertyPage::CamShiftTrackerPropertyPage(IUnknown *outer, HRESULT *phr) :
    CBasePropertyPage(NAME("CamShift Tracker Property Page"), outer, IDD_CamShiftTrackerPropertyPage, IDS_TITLE)
{
}

CamShiftTrackerPropertyPage::~CamShiftTrackerPropertyPage()
{
    for (int i = 0; i < m_trackers.size(); i++)
        SAFE_RELEASE(m_trackers[i]);
}

//
// OnReceiveMessage
//
// Handles the messages for our property window
//
BOOL CamShiftTrackerPropertyPage::OnReceiveMessage(HWND hwnd, UINT msg, WPARAM w, LPARAM l)
{
    if (msg == WM_COMMAND)
    {
        switch (HIWORD(w))
        {
            case BN_CLICKED:
                switch (LOWORD(w))
                {
                    case IDC_CALIBRATE:
                        for (int i = 0; i < m_trackers.size(); i++)
                            m_trackers[i]->Calibrate();
                        break;
                }
                break;
        }
    }

    return CBasePropertyPage::OnReceiveMessage(hwnd, msg, w, l);
}

//
// OnConnect
//
// Called when we connect to the filter
//
HRESULT CamShiftTrackerPropertyPage::OnConnect(IUnknown *pUnknown)
{
    ITracker3dFilter *tracker_filter;

    HRESULT hr = pUnknown->QueryInterface(IID_ITracker3dFilter, (void **) &tracker_filter);
    if (FAILED(hr))
        return hr;

    std::vector<ITracker *> trackers;
    tracker_filter->GetTrackers(trackers);
    m_trackers.resize(0);
    m_trackers.reserve(trackers.size());
    for (int i = 0; i < trackers.size(); i++)
    {
        // Ensure that we are the correct property page for each filter
        // Ignore any that request a different page
        GUID page = GUID_NULL;
        trackers[i]->GetPropertyPage(&page);
        if (page == CLSID_CamShiftTrackerPropertyPage)
        {
            ICamShiftTracker *p;
            trackers[i]->QueryInterface(IID_ICamShiftTracker, (void **)&p);
            m_trackers.push_back(p);
        }
        trackers[i]->Release();
    }

    tracker_filter->Release();

    return NOERROR;
}


//
// OnDisconnect
//
// Called when we disconnect from the filter
//
HRESULT CamShiftTrackerPropertyPage::OnDisconnect()
{
    for (int i = 0; i < m_trackers.size(); i++)
        SAFE_RELEASE(m_trackers[i]);
    m_trackers.clear();

    return NOERROR;
}

//
// OnActivate
//
// We are being activated
//
HRESULT CamShiftTrackerPropertyPage::OnActivate()
{
    return NOERROR;
}

//
// OnDeactivate
//
// We are being deactivated
//
HRESULT CamShiftTrackerPropertyPage::OnDeactivate(void)
{
    return NOERROR;
}

//
// OnApplyChanges
//
// Apply any changes so far made
//
HRESULT CamShiftTrackerPropertyPage::OnApplyChanges()
{
    return NOERROR;
}