The Borland MessageBox requires the BWCC32.DLL. If you do not have this DLL, download the demo program and DLL here: MessageBox Demos - 67 KB

The Borland MessageBox function uses exactly the same arguments as the Windows MessageBoxA function. Both are demonstrated below. The Borland MessageBox function is called "BWCCMessageBox".

Documentation for the Windows MessageBoxA function can be found at the MSDN Library

Here is a side-by-side comparison of the appearance:

wtype = _MB_ICONEXCLAMATION or _MB_YESNOCANCEL or _MB_DEFBUTTON2
message$ = "This looks normal."
title$ = "A Windows Message Box"

'Windows MessageBox
calldll #user32, "MessageBoxA", _
    0 as ulong,_    'window handle or 0
    message$ as ptr,_
    title$ as ptr,_
    wtype as ulong,_    'flags for buttons and icons
    RESULT as long

select case RESULT
    case _IDABORT
        print "Abort button was selected. "
    case _IDCANCEL
        print "Cancel button or the close button on the title bar was selected."
    case _IDIGNORE
        print "Ignore button was selected."
    case _IDNO
        print "No button was selected. "
    case _IDOK
        print "OK button was selected. "
    case _IDRETRY
        print "Retry button was selected. "
    case _IDYES
        print "Yes button was selected."
    end select

wtype = _MB_ICONEXCLAMATION or _MB_YESNOCANCEL or _MB_DEFBUTTON2
message$ = "This looks different!"
title$ = "A Borland Message Box"

'Borland MessageBox - requires add-on DLL
open "bwcc32.dll" for dll as #bwcc
calldll #bwcc, "BWCCMessageBox", _
    0 as ulong,_    'window handle or 0
    message$ as ptr,_
    title$ as ptr,_
    wtype as ulong,_    'flags for buttons and icons
    RESULT as long
close #bwcc

select case RESULT
    case _IDABORT
        print "Abort button was selected. "
    case _IDCANCEL
        print "Cancel button or the close button on the title bar was selected."
    case _IDIGNORE
        print "Ignore button was selected."
    case _IDNO
        print "No button was selected. "
    case _IDOK
        print "OK button was selected. "
    case _IDRETRY
        print "Retry button was selected. "
    case _IDYES
        print "Yes button was selected."
    end select