[Insight-users] Problem in closing a VTK viewer window using MFC GUI

[pef magic]

Hi everyone!

I have problem in closing properly the VTK window while I am using a
MFC environment.

I have just done a very simple interface (see attached document) to
the VTK viewer given in the ITK examples.
Basically, I put the example in int CVTKviewerDlg::load_file() and I
add an exit button void CVTKviewerDlg::OnBnClickedButton1()  doing:
{
   reader->Delete();
   connector->Delete();
   viewer->Delete();
   renderWindowInteractor->Delete();
   OnCancel();
}
It seems to exit properly but the program is actually still running.

Is there another solution to this problem rather than not using MFC?

Thank you very much.
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// VTKviewerDlg.cpp : implementation file
//

#include "stdafx.h"
#include "VTKviewer.h"
#include "VTKviewerDlg.h"


#include "itkImage.h"
#include "itkImageFileReader.h"
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "itkImageToVTKImageFilter.h"
#include "vtkActor2D.h"
#include "vtkRenderer.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

	typedef signed short      PixelType;
	const   unsigned int        Dimension = 3;

	typedef itk::Image< PixelType, Dimension >   ImageType;
	typedef itk::ImageFileReader< ImageType >    ReaderType;
	typedef itk::ImageToVTKImageFilter< ImageType > ConnectorType;

	ReaderType::Pointer reader;
	ConnectorType::Pointer connector;
	vtkImageViewer *viewer;
	vtkRenderWindowInteractor *renderWindowInteractor;



void CVTKviewerDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	CScrollBar* aScroll=(CScrollBar*)GetDlgItem(IDC_SCROLLBAR);
	switch(nSBCode)
			{
			case SB_THUMBPOSITION:
				aScroll->SetScrollPos(nPos);
				break;
			case SB_THUMBTRACK:
				aScroll->SetScrollPos(nPos);
				break;
			case SB_LINELEFT:
				aScroll->SetScrollPos(result_slice-1);
				break;
			case SB_LINERIGHT:
				aScroll->SetScrollPos(result_slice+1);
				break;
			case SB_PAGELEFT:
				aScroll->SetScrollPos(result_slice-50);
				break;
			case SB_PAGERIGHT:
				aScroll->SetScrollPos(result_slice+50);
				break;
			case SB_ENDSCROLL:
				return;
				break;
			}
	result_slice=aScroll->GetScrollPos();
	viewer->SetZSlice(result_slice);
	viewer->Render();
	UpdateData(false);
}




int CVTKviewerDlg::load_file()
{
	reader = ReaderType::New();
	connector = ConnectorType::New();

	reader->SetFileName("BrainProtonDensity3Slices.mha");
	reader->Update();

	connector->SetInput(reader->GetOutput());


	int X_max=reader->GetOutput()->GetLargestPossibleRegion().GetSize()[0];
	int Y_max=reader->GetOutput()->GetLargestPossibleRegion().GetSize()[1];
	int Z_max=reader->GetOutput()->GetLargestPossibleRegion().GetSize()[2];

	// initialisation of the high threshold scroll bar
	CScrollBar* aScroll=(CScrollBar*)GetDlgItem(IDC_SCROLLBAR);
	aScroll->SetScrollRange(0, Z_max-1, TRUE);
	aScroll->SetScrollPos(result_slice,TRUE);

	viewer=vtkImageViewer::New();
	renderWindowInteractor=vtkRenderWindowInteractor ::New();
	viewer->SetupInteractor(renderWindowInteractor);
	viewer->SetInput(connector->GetOutput());

	int place[2];
	place[0]=0;
	place[1]=50;
	viewer->SetPosition(place);
	viewer->SetZSlice(0);
	viewer->SetColorLevel(40);
	viewer->Render();
	renderWindowInteractor->Start();

	return 0;
}



// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CVTKviewerDlg dialog




CVTKviewerDlg::CVTKviewerDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CVTKviewerDlg::IDD, pParent)
	, result_slice(0)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CVTKviewerDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EDIT, result_slice);
}

BEGIN_MESSAGE_MAP(CVTKviewerDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_HSCROLL()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_BUTTON1, &CVTKviewerDlg::OnBnClickedButton1)
END_MESSAGE_MAP()


// CVTKviewerDlg message handlers

BOOL CVTKviewerDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	ShowWindow(SW_SHOW);
    load_file();

	// TODO: Add extra initialization here

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CVTKviewerDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CVTKviewerDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CVTKviewerDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}


void CVTKviewerDlg::OnBnClickedButton1()
{
	reader->Delete();
	connector->Delete();
	viewer->Delete();
	renderWindowInteractor->Delete();

	OnCancel();
}