MFC combox, user typed value

Hello,

Ive a legacy combobox of CBS_DROPDOWN type.

And somehow, user typed value is not getting updated.

I tried to write a small example code in VS2015, where, the event handler doesnot get called, on writting a text to combo box:
Any suggestions on this is very helpful

Code:

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// MFCApplication3Dlg.h : header file
//

#pragma once
#include "afxwin.h"


// CMFCApplication3Dlg dialog
class CMFCApplication3Dlg : public CDialogEx
{
// Construction
public:
        CMFCApplication3Dlg(CWnd* pParent = NULL);        // standard constructor

// Dialog Data
#ifdef AFX_DESIGN_TIME
        enum { IDD = IDD_MFCAPPLICATION3_DIALOG };
#endif

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


// Implementation
protected:
        HICON m_hIcon;

        // Generated message map functions
        virtual BOOL OnInitDialog();
        afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
        afx_msg void OnPaint();
        afx_msg HCURSOR OnQueryDragIcon();
        DECLARE_MESSAGE_MAP()
public:
        CComboBox m_sim;
        CString m_val;
        afx_msg void OnCbnSelchangeCombo1();
        afx_msg void OnCbnSelchangeCombo2();
};



.cpp


// MFCApplication3Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "MFCApplication3.h"
#include "MFCApplication3Dlg.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::DoDataExchange(CDataExchange* pDX)
{
        CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CMFCApplication3Dlg dialog



CMFCApplication3Dlg::CMFCApplication3Dlg(CWnd* pParent /*=NULL*/)
        : CDialogEx(IDD_MFCAPPLICATION3_DIALOG, pParent)
{
        m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMFCApplication3Dlg::DoDataExchange(CDataExchange* pDX)
{
        CDialogEx::DoDataExchange(pDX);
        DDX_Control(pDX, IDC_COMBO1, m_sim);
}

BEGIN_MESSAGE_MAP(CMFCApplication3Dlg, CDialogEx)
        ON_WM_SYSCOMMAND()
        ON_WM_PAINT()
        ON_WM_QUERYDRAGICON()
        ON_CBN_SELCHANGE(IDC_COMBO1, &CMFCApplication3Dlg::OnCbnSelchangeCombo1)
        ON_CBN_SELCHANGE(IDC_COMBO2, &CMFCApplication3Dlg::OnCbnSelchangeCombo2)
END_MESSAGE_MAP()


// CMFCApplication3Dlg message handlers

BOOL CMFCApplication3Dlg::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

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

void CMFCApplication3Dlg::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 CMFCApplication3Dlg::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 CMFCApplication3Dlg::OnQueryDragIcon()
{
        return static_cast<HCURSOR>(m_hIcon);
}




void CMFCApplication3Dlg::OnCbnSelchangeCombo1()
{
        int item = m_sim.GetCurSel();

        int sel = m_sim.GetCurSel();
        if (sel == -1)
        {
                CString str;
                m_sim.GetWindowTextW(str);
        }
        //if (sel == -1)
        //{
        //        int len = m_sim.GetWindowTextLength() + 1;
        //        string tp = new char[len];
        //        m_sim.GetWindowTextA(tp, len);
        //        sel = m_sim.FindStringExact(-1, tp);
        //        if (sel == -1)
        //        {
        //                sel = wnd.InsertString(0, tp);
        //                wnd.SetCurSel(sel);
        //        }
        //        int cnt;
        //        while ((cnt = wnd.GetCount()) >= 20)
        //                wnd.DeleteString(cnt - 1);
        //}
        else
        {
                m_sim.GetLBText(m_sim.GetCurSel(), m_val);
                UpdateData(FALSE);
        }
        //if (item != CB_ERR)
        //{
        //        CString text;
        //        m_sim.GetLBText(item, text);
        //}
        // TODO: Add your control notification handler code here
}

void CMFCApplication3Dlg::OnCbnSelchangeCombo2()
{
        int i = 0;
        // TODO: Add your control notification handler code here
}

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Try to handle CBN_EDITUPDATE or CBN_EDITCHANGE notification.