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Message Box in MFC |
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Message boxes are modal dialogs which once activated needs a user input doesn’t
allow to do anything else in the application, which “owns” (parents) the modal
dialog. A developer can use message boxes to display, during the running of the
program, small information important for the user. They also have a return value
which gives the user’s choice when the message box is closed. The call to the
MessageBox() function causes a message box to be displayed. The value
returned by the MessageBox() function depends on the button selected on the
message box by the user. The first argument to this function is the string (or a pointer to a buffer containing the string) that would be displayed within the message box. The second argument is the string (or a pointer to the string) that would be the caption bar of the message box. The third argument of MessageBox() would consist Button Style and or one of the icon specifiers and or one or two of the modifiers as from the lists below Return Value: Zero is returned when there is not enough memory to display the message box; otherwise one of the following values is returned: IDABORT : Abort button was selected. IDCANCEL : Cancel button was selected. IDIGNORE : Ignore button was selected. IDNO : No button was selected. IDOK : OK button was selected. IDRETRY : Retry button was selected. IDYES : Yes button was selected. Button Style List: The indicated buttons will be displayed in the message box if these style is used. MB_OK “OK” button MB_YESNO “Yes” and “No” buttons MB_YESNOCANCEL “Yes,” “No,” and “Cancel” buttons MB_RETRYCANCEL “Retry” and “Cancel” buttons MB_OKCANCEL “OK” and “Cancel” buttons MB_ABORTRETRYIGNORE “Abort,” “Retry,” and “Ignore” buttons Icon Specifier List: The corresponding icon for each of the specifier will be displayed in the upper left part of the message box. MB_ICONINFORMATION Lowercase “i” in a circle MB_ICONEXCLAMATION Exclamation point in a circle MB_ICONSTOP Stop sign MB_ICONQUESTION Question mark |
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| RELATED TOPICS | |||
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Structure of an MFC Application Creating a Main Window Using MFC Window Styles Registering a Window Class Resource Files in MFC Applications Menus in MFC Application Message Maps in MFC Application Accelerators in MFC Applications Message Handler Functions Timer in an MFC Application Dynamic Menu in MFC Windows OS Message handlers in CWnd |
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