Set Default Text in MFC TextBox

To set the default value for an MFC text box, you can use the SetWindowText() function in the OnInitDialog() function of the dialog class. For example, if there is a text box control with an ID of ID_EDIT_TEXT, you can add the following code in the OnInitDialog() function to set the default value.

CString defaultText = _T("Default Value");
GetDlgItem(IDC_EDIT_TEXT)->SetWindowText(defaultText);

In this way, the default value of the text box can be set to “Default Value” when initializing the dialog box. It is important to note that the SetWindowText() function accepts parameters of type CString, so the default value needs to be converted to a CString type.