MFC CEdit: Could please somebody explain this ?

This is a discussion on MFC CEdit: Could please somebody explain this ? within the Windows Programming forums, part of the Platform Specific Boards category; Hi all! while learing to code a CEdit box i encouterd something that i don't understand. The below code 1st ...

  1. #1
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    Nov 2001
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    Question MFC CEdit: Could please somebody explain this ?

    Hi all!

    while learing to code a CEdit box i encouterd something that i don't understand.

    The below code 1st pre-clears a string using ZeroMemory function.
    The TRACE statement always gives CEDITN: 0 in the debug
    window.

    When commenting out ZeroMemory then CEDITN returns
    suddenly the ammout of characters typed in.


    Code:
    /////////////////////////////////////////////////////////////////////////////
    // CDlgNewString
    
    void CDlgNewString::OnChangeEditNewString() 
    {
    	ZeroMemory(&m_cNewString[0], 14);
    
    	CEdit *pEdit = (CEdit *)GetDlgItem(IDC_EDIT_NEWSTRING);
    
    	int n = pEdit->GetLine (0, &m_cNewString[0]);
    	TRACE("CEDITN: %ld\n", n);
    
    	if (!n)
    		GetDlgItem(IDOK)->EnableWindow(false);
    
    	else
    		GetDlgItem(IDOK)->EnableWindow(true);
    }
    Can somebody please tell, why ZeroMemory influences a CEdit Control ??

    Regards,
    Robert

  2. #2
    Registered User Codeplug's Avatar
    Join Date
    Mar 2003
    Posts
    4,676
    Read the reference for CEdit::GetLine()
    Notice the lpszBuffer parameter.

    gg

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