How do I disable edit control in MFC

OK, your question isn't all that clear to me. Let's see if I can sort it out.

You have a button and an edit control.

1) You want the button disabled when the edit control is empty, enabled otherwise.

2) You want the edit control disabled for some time period after the button is clicked.

You already know how to enable/disable a control.

For #2 you will want to use a timer. Here[^] is some information.

For #1, it sounds to me like you already know about CEdit's ON_EN_CHANGE message handler. You would derive a new class from CEdit implementing such a message handler and include it in the message map for that class.

You would then use an instance of that class for your edit control. How you do that depends on how you are creating the control in the first place.

To check if the edit control is empty, have you considered using CWnd::GetWindowText[^] or CWnd::GetWindowTextLength[^] ?

@kinar
I know this method but I want to bind it with some control like ONEnUpdate() or ONEnChange() where I can use some if statement like

<br />
if (str!="")<br />
{<br />
m_an.EnableWindow(TRUE)<br />
}<br />
else<br />
{

@Avi

Let me clear few things to give you a better idea. Run() is the function on which all other functions are depending. In one cycle of 100 iterations, a text is shown by Run() and is checked by Check() and compared with user input by IsCorrect(s) and all this is happening within OnBtClicked() till 100 iterations are completed.

Within IsCorrect() I have strcmpare(CString, CString) function that takes both strings and returns a float value depeneding on which the input is either marked corect or incorrect.

What I want is:
to disable the Cbutton when user interface is loaded before the start of 1st iteration and enable it when there is some text in edit contrl.

In message map, I have the entry

ON_BN_CLICKED(IDC_IT_START, &CIT::OnBnClickedStart)

// loads the ui

ON_EN_UPDATE(C_IT_ANS, &CIT::OnEnUpdateBt())

and I want to use this edit contrl for enabl/disble Cbutton.

void CIT::OnEnUpdateBt()
{

 if(str!="")
        {
            m_record.EnableWindow(TRUE);

        }


}

But this control doesn't get activated the way as is desired.