Debug assertion failed! MFC Application Visual studio 2015 c++

[r_VS2015]

I am new to visual studio and I want to create a simple mfc application with a combo box selection.



// MFCApplicationTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MFCApplicationTest.h"
#include "MFCApplicationTestDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

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

// Dialog Data
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_ABOUTBOX };
#endif

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

// Implementation
protected:
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}

void CAboutDlg:oDataExchange(CDataExchange* pDX)
{
CDialogEx:oDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CMFCApplicationTestDlg dialog



CMFCApplicationTestDlg::CMFCApplicationTestDlg(CWnd* pParent /*=NULL*/)
: CDialogEx(IDD_MFCAPPLICATIONTEST_DIALOG, pParent)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMFCApplicationTestDlg:oDataExchange(CDataExchange* pDX)
{
CDialogEx:oDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CMFCApplicationTestDlg, CDialogEx)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_CBN_SELCHANGE(IDC_COMBO1, &CMFCApplicationTestDlg::OnCbnSelchangeCombo1)
ON_CBN_SELENDOK(IDC_COMBO1, &CMFCApplicationTestDlg::OnCbnSelendokCombo1)
END_MESSAGE_MAP()


// CMFCApplicationTestDlg message handlers

BOOL CMFCApplicationTestDlg::OnInitDialog()
{
CDialogEx::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)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
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

// TODO: Add extra initialization here
CComboBox *combo = new CComboBox();
combo->AddString(L"csv1.csv");
combo->AddString(L"csv2.csv");
combo->AddString(L"csv3.csv");


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

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

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



void CMFCApplicationTestDlg::OnCbnSelchangeCombo1()
{
// TODO: Add your control notification handler code here
CString csv[] = { _T(""), _T("csv1.csv"),_T("csv2.csv"),_T("csv3.csv") };
UpdateData(FALSE);
}


void CMFCApplicationTestDlg::OnCbnSelendokCombo1()
{
CComboBox *combo1 = new CComboBox();
CString file;
int n;
// TODO: Add your control notification handler code here
int index = combo1->GetCurSel();
combo1->GetLBText(index, file);

}




It was working till yesterday and I was just wondering how to display the string. But today I have got this problem which says



Debug Assertion failed!

Program:
...Root\MFCApp\MFCApplicationTest2\Debug\MFCApplicationTest2.exe
File:f:\dd\vctools\cv7libs\shop\atlmfc\include\afxwin2.inl
Line: 795

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

(Please retry to debug the application)



And when I click retry I get this,

MFCApplicationTest2.exe has triggered a breakpoint.



breaking this takes me to this line of assertion failure,


{ ASSERT:IsWindow(m_hWnd)); return (int)::SendMessage(m_hWnd, CB_ADDSTRING, 0, (LPARAM)lpszString); }



I checked this post which is related to my question on the topic on this forum,

MFX CComboBox assert error doing AddString



and I noticed that I haven't made that mistake and I am not sure what the problem is.


Please do help.

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