problem using CListCtrl

thefoo · #1 07-Aug-2009, 17:16

As I'm a beginner in MFC I'm trying to develop a simple MFC application. I've prepared main application class, and tried to use CListCtrl. So I've used resource editor: added a dialog and a CListCtrl. Finaly I've bound m_listMain of type CListCtrl to the list using "right->add variable". And here comes the problem. Whenever i want use any method related to m_listMain (i.e. InsertItem, SetExtendedStyle) debug assertion comes up, saying that it failed on ASSERT(::IsWindow(m_hWnd)); Does anyone know any probable explanation? Am I missing something important(an initialization or what...)?

main.cpp

CPP / C++ / C Code:

#include "headers.h"
#include "MainDialog.h"

class Whatsup : public CWinApp
{
	MainDialog *m_dlgMain;

public:
	BOOL InitInstance()
	{
		m_dlgMain = new MainDialog();
		m_pMainWnd = m_dlgMain;
		m_dlgMain->DoModal();
		return TRUE;
	}
};

Whatsup hwnd;

MainDialog.cpp

CPP / C++ / C Code:

#include "headers.h"
#include "MainDialog.h"

IMPLEMENT_DYNAMIC(MainDialog, CDialog)

MainDialog::MainDialog(CWnd* pParent /*=NULL*/)
	: CDialog(MainDialog::IDD, pParent)
{

}

MainDialog::~MainDialog()
{

}

void MainDialog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_LIST1, m_listMain);
}

BOOL MainDialog::OnInitDialog()
{
	m_listMain.SetExtendedStyle(m_listMain.GetExtendedStyle() | LVS_EX_CHECKBOXES);
	LVITEM lvItem;

	lvItem.mask = LVIF_TEXT;
	lvItem.iItem = 0;
	lvItem.iSubItem = 0;
	lvItem.pszText = "TestString";
	m_listMain.InsertItem(&lvItem);
	return TRUE;
}

MainDialog.h

CPP / C++ / C Code:

#pragma once
#include "resource.h"
#include "headers.h"


class MainDialog : public CDialog
{
	DECLARE_DYNAMIC(MainDialog)
public:
	MainDialog(CWnd* pParent = NULL);   // standard constructor
	virtual ~MainDialog();
	BOOL OnInitDialog();
	CListCtrl m_listMain;

// Dialog Data
	enum { IDD = IDD_MAIN };

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

headers.h: just inclusion of afxwin.h and afxcmn.h

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