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::DoDataExchange(CDataExchange* pDX) { CDialogEx::DoDataExchange(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::DoDataExchange(CDataExchange* pDX) { CDialogEx::DoDataExchange(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. But then if I keep retrying and hit continue it takes me to the output.
I am not sure what the problem is. Please do help.
! So i added the ExitInstance handler of MFC dll to verify when the memory leaks is fired:
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