1.00 1.50 1.51 1.52 | 1.00 2.00 2.10 4.00
WINDOWS | WINDOWS NT
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The information in this article applies to:
- The Microsoft Foundation Classes (MFC) included with:
- Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, and 1.52
- Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1, and 4.0
This article demonstrates one way to disable or enable a dialog box control
during the execution of a program with the Microsoft Foundation Classes
(MFC). The dialog box uses a dialog box template created by App Studio.
To disable or enable a control in a dialog box, the following steps can be
performed:
- Create a data member in the dialog box class that maps to a specific
control (you can use Class Wizard to do this). For example:
...
public:
CButton m_button;
...
- Override CWnd::DoDataExchange(CDataExchange *pDX) in the dialog box
class and call the appropriate DDX routine to hook the Windows control
to the dialog class data member. For example:
...
protected:
virtual void DoDataExchange(CDataExchange* pDX);
...
void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_BUTTON1, m_button);
}
Note: If you use Class Wizard to add a member variable in your dialog
box class, it does this for you.
- Call CWnd::EnableWindow() to disable or enable the control when needed.
For example, you can disable a button when the dialog box is
initialized. For example:
CMyDlg::OnInitDialog()
{
...
m_button.EnableWindow(FALSE);
...
}
An alternative method is to use the CWnd::GetDlgItem() function to get a
CWnd * to the control and then call EnableWindow(). For example:
CMyDlg::OnInitDialog()
{
...
GetDlgItem(IDC_BUTTON)->EnableWindow(FALSE);
...
}
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