Modify the WM_COMMAND Case

Child-window controls notify the parent window of events by using a WM_COMMAND message. The wParam parameter of the WM_COMMAND message identifies the control that generated the message.

To recognize an out-of-memory notification from the edit control, add the following code to the WM_COMMAND case:

case IDC_EDIT:

if(HIWORD (lParam) == EN_ERRSPACE) {

MessageBox (

GetFocus (),

“Out of memory.”,

“EditCntl Sample Application”,

MB_ICONHAND | MB_OK

);

}

break;