Question

What is the maximum length for the text string contained in a CEdit control in MFC? I get a beep when trying to add a character after the character 30001 is this documented anywhere? Can I display longer texts in a CEdit? Should I use another control?

As ‘Windows programmer’ says down below, the text length limit is not the same when the user types as when we programatically set the text using SetWindowText. The limit for setting a text programatically is not mentioned anywhere. The default text lentgth limit for the user typing is wrong. (see my own post below).

I’m guessing that after I call pEdit->SetLimitText(0) the limit for both programatically and user input text length is 7FFFFFFE bytes. Am I right?

In vista, when pasting text longer than 40000 characters into a CEdit, it becomes unresponsive. It does not matter if I called SetLimitText(100000) previously.

Answer 1

I found the documentation is wrong when mentioning the default size for a single line CEdit control in vista.

I ran this code:

CWnd* pWnd = dlg.GetDlgItem(nItemId); CEdit *edit = static_cast<CEdit*>(pWnd); //dynamic_cast does not work if(edit != 0) {     UINT limit = edit->GetLimitText(); //The current text limit, in bytes, for this CEdit object.     //value returned: 30000 (0x7530)     edit->SetLimitText(0);     limit = edit->GetLimitText();     //value returned: 2147483646 (0x7FFFFFFE)  } 

the documentation states:

Before EM_SETLIMITTEXT is called, the default limit for the amount of text a user can enter in an edit control is 32,767 characters.

which is apparently wrong.