yet another ASSERT(::IsWindow(...)) problem
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  1. #1
    Join Date
    Feb 2009
    Posts
    5

    yet another ASSERT(::IsWindow(...)) problem

    Hi folks,

    I'm quite new to VC++ and I'm having a problem this morning that is driving me nuts. I'll try to explain it short and clear:

    I have a dialog in my app. with just a CRichEditCtrl to make some testing stuff. The goal here is to get the CHARFORMAT from another rich edit view in the app. and set it to this control. I just need to see this test stuff working to get somewhere else, I'll spare you the details.
    So I have a class called CTestRtfDialog with a typical TestRtfDialog.h declaration

    [...]
    class CTestRtfDialog : public CDialog
    {
    // Construction
    public:
    CTestRtfDialog(CWnd* pParent = NULL); // standard constructor

    // Dialog Data
    //{{AFX_DATA(CTestRtfDialog)
    enum { IDD = IDD_TEST_RTF };
    CRichEditCtrl m_TestRtf;
    //}}AFX_DATA

    // Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CTestRtfDialog)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
    //}}AFX_VIRTUAL
    [...]
    Plus some event handlers I don't want to bore you with

    Then in my CWinApp class' InitInstance method I have some typical things like DocTemplate, ParseCommandLine and at this point where evrything is supposed to be initialized (I've spent pretty enough time tracing to check it out) I have this lines to get the CHARFORMAT from that rich edit view I mentioned before:

    [...]
    CMainFrame * pFrame = (CMainFrame *)(AfxGetApp()->m_pMainWnd);
    CExpertView * pView = (CExpertView *)pFrame->GetActiveView();
    CHARFORMAT cf = pView->GetCharFormatSelection();
    [...]

    Everything is cool up to this point. Now the problems:
    Right after these lines I put those:

    CTestRtfDialog *pTestRtfDlg = (CTestRtfDialog *)pFrame->GetTestRtfDlg();
    pTestRtfDlg->SetDefaultFormat(cf);

    This GetTestRtfDlg is a method in my CMainFrame that just returns a reference to the dialog with the CRichEditCtrl. SetDefaultFormat(CHARFORMAT &cf) is a method in CTestRtfDialog:

    void CTestRtfDialog::SetDefaultFormat(CHARFORMAT &cf)
    {
    m_TestRtf.SetDefaultCharFormat(cf);
    }

    As you can figure out at this point I get my assertion fail as >>ASSERT(::IsWindow(m_hWnd));
    inside >>BOOL CRichEditCtrl::SetDefaultCharFormat(CHARFORMAT &cf) is not satisfied.

    So I said well, let's keep a copy of this CHARFORMAT in a member of my dialog at this point and set it later when the component compies the assertion:

    // 1. Redefine this method
    void CTestRtfDialog::SetDefaultFormat(CHARFORMAT &cf)
    {
    m_DefaultCharFormat = cf;
    }

    // 2. Give InitDialogEvent a try
    BOOL CTestRtfDialog::OnInitDialog()
    {
    CDialog::OnInitDialog();
    m_TestRtf.SetDefaultCharFormat(m_DefaultCharFormat); // (!!!)
    return TRUE;
    }

    Hum... doesn't crash but the format in the edit control and in the view don't match... why?

    Some more tracing to check it out and I discover that OnInitDialog is triggered BEFORE the point where I call my SetDafaultFormat method, thus m_DefaultCharFormat has some random content.
    To be some specific the event is triggered somewhere inside the

    if (!ProcessShellCommand(cmdInfo))
    return FALSE;

    that is in InitInstance method and right before my code!

    What doesn't make any sense to me is that inside the event handler the assertion complies but LATER in my SetDefaultFormat method IT DOESN'T!

    Could someone explainme what's the problem here?

    Thanks in advance
    Last edited by fotw; February 2nd, 2009 at 08:47 AM. Reason: misspeling

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