ID Number: Q72136
3.00
WINDOWS
Summary:
When creating a modeless dialog box with the default dialog class, an
application normally passes a procedure-instance address of the dialog
function to the CreateDialog() function. This dialog function
processes messages such as WM_INITDIALOG and WM_COMMAND, returning
TRUE or FALSE.
It is acceptable to create a modeless dialog box that uses NULL for
the lpDialogFunc parameter of CreateDialog(). This type of dialog is
useful when the no controls or other input facilities are required. In
this case, using NULL simplifies the programming.
However, the dialog must be closed through some means other than a
push button. This might be a timer event. NOTE: A modal dialog box
that does not provide a means of closing itself will hang its parent
application because control will never return from the DialogBox()
function call.
If lpDialogFunc is NULL, no WM_INITDIALOG message will be sent, and
DefDlgProc() does not attempt to call a dialog function. Instead,
DefDlgProc() handles all messages for the dialog. The application that
created the modeless dialog must explicitly call DestroyWindow() to
free its system resources.