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MessageBox()

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int MessageBox(
  [in, optional] HWND    hWnd,
  [in, optional] LPCTSTR lpText,
  [in, optional] LPCTSTR lpCaption,
  [in]           UINT    uType
);

An example is: MessageBox (NULL, TEXT ("Hello, Windows 98!"), TEXT ("Somewindowname"), 0) ;

MB_ Prefixed Constants List

The 4th argument can actually be a combination of MB_ prefixed constants.

#define MB_OK 0x00000000L
#define MB_OKCANCEL 0x00000001L
#define MB_ABORTRETRYIGNORE 0x00000002L
#define MB_YESNOCANCEL 0x00000003L
#define MB_YESNO 0x00000004L
#define MB_RETRYCANCEL 0x00000005L
// main button constants. Says which button is main one
#define MB_DEFBUTTON1 0x00000000L
#define MB_DEFBUTTON2 0x00000100L
#define MB_DEFBUTTON3 0x00000200L
#define MB_DEFBUTTON4 0x00000300L
// icon of message box
#define MB_ICONHAND 0x00000010L
#define MB_ICONQUESTION 0x00000020L
#define MB_ICONEXCLAMATION 0x00000030L
#define MB_ICONASTERISK 0x00000040L
#define MB_ICONWARNING MB_ICONEXCLAMATION
#define MB_ICONERROR MB_ICONHAND
#define MB_ICONINFORMATION MB_ICONASTERISK
#define MB_ICONSTOP MB_ICONHAND

If my line is: MessageBox (NULL, TEXT ("Hello, Windows 98!"), TEXT ("Somewindowname"), 0) ; the 4th argument is a value of 0, this is equivalent to MB_OK. it will have an OK box. Additionally, since its 0, it will have MB_DEFBUTTON1 meaning the first button is the main button, If I had 2 buttons like: MessageBox (NULL, TEXT ("Hello, Windows 98!"), TEXT ("Somewindowname"), MB_OK | MB_CANCEL) ; “ The Ok button would be the main button and have focus since its button 0. I would also have 2 buttons as I gave it 2 constants

Return

The message box returns an int type. This int type is the response of the message box (which button they pressed). IDOK is the value 1, which is the value returned when the user pressed on the OK button. Messagebox can also return: IDYES, IDNO, IDCANCEL, IDABORT, IDRETRY, or IDIGNORE with each of them having their respective int value representation.

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