ID Number: Q67210
2.00 2.03 2.10 3.00
WINDOWS
Summary:
Message boxes are used to provide information to the user of an
application. Error messages and warnings are also provided through
message boxes. This article provides details on using message boxes in
applications.
More Information:
Message boxes are modal windows. When an application displays an
application modal message box, which is the default message box type,
the user cannot interact with any part of that application until the
message box has been dismissed. However, the user may use the mouse or
keyboard to activate another application and interact with it while
the message box is displayed. Certain critical errors that may affect
all of Windows are displayed in system modal message boxes. Windows
will not perform any operations until the error condition is
acknowledged and the system modal message box is dismissed.
There are times where it is necessary to display a long message in a
message box. Windows does this when you start a DOS application that
uses graphics from inside a DOS window. To break a message into many
lines, insert a newline character into the message text. Here is a
sample MessageBox() call:
MessageBox(hWnd, "This is line 1.\nThis is line 2.", "App",
MB_OK | MB_ICONQUESTION);
If the text of a message is too long for a single line, Windows will
break the text into multiple lines.
System modal message boxes treat the newline character as any other. A
newline character is displayed as a black block in the text. Because
system modal message boxes are designed to work at all times, even
under extremely low memory conditions, it does not provide the ability
to display more than one line of text.