A common dialog box sends a message to notify applications that the user has made or changed a selection in the dialog box. Applications can use these messages to carry out custom actions, such as rejecting certain user selections or setting custom colors.
Before an application can use a common dialog box message, it must register that message by using the RegisterWindowMessage function and the message constants given in this chapter and defined in the COMMDLG.H header file.
This chapter describes the common dialog box messages. The messages appear in alphabetic order.