Displaying a Message Box
The simplest form of modal dialog box is the message box. Most applications
use message boxes to warn the user of errors and to prompt for directions on how
to proceed after an error has occurred. You create a message box by using the
MessageBox or
MessageBoxEx function, specifying the message and the number and type of buttons to
display. Windows creates a modal dialog box, providing its own dialog box template
and procedure. After the user closes the message box,
MessageBox or
MessageBoxEx returns a value identifying the button chosen by the user to close the message
box.
In the following example, the application displays a message box if the
fError variable is TRUE. The message box displays the message describing the error.
The MB_OKCANCEL style directs
MessageBox to provide two buttons with which the user can choose how to proceed:
if (fError) {
if (MessageBox(hwndDlg, SZNOTFOUND, SZDELETEITEM,
MB_OKCANCEL)==IDOK)
.
. // Prompt for a new item name and repeat the command.
.
else
.
. // Cancel the command.
.
}
In this example, SZNOTFOUND and SZDELETEITEM are application-defined,
null-terminated strings that represent the message text and the title for the message
box.
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