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Editorial Team
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Asked: 2026-05-31T09:15:20+00:00

I need to change the default caption of a MsgBox message box at runtime.

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I need to change the default caption of a MsgBox message box at runtime. Currently it constantly shows the value of the SetupAppTitle directive as a caption:

[Setup]
SetupAppTitle=myAppName

But this is specified at compilation time. How to do this at runtime, e.g. from a [Code] section ?

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1 Answer

  1. Editorial Team

    This is how i finally did it:

    [Code]
{ https://msdn.microsoft.com/en-us/library/windows/desktop/ms645505.aspx }
{ Use Windows MessageBox() function as an MsgBox() replacement. }
{ MessageBoxW is the UNICODE version of this API call. }
const
  { these are not exported in Inno Setup! }
  MB_ICONERROR = $00000010;
  MB_ICONWARNING = $00000030;
  MB_ICONINFORMATION = $00000040;
  MB_ICONQUESTION = $00000020;

function _MessageBoxW_(hWnd: Integer; lpText, lpCaption: String; uType: Cardinal): Integer;
  external 'MessageBoxW@user32.dll stdcall';

{ Usage: SysMsgBox('Error', 'Shit happens!', MB_OK or MB_ICONERROR); }
{        res =: SysMsgBox('Question', 'blah blah', MB_YESNO or  MB_ICONQUESTION); }
function SysMsgBox(const Caption, Message: String; const Flags: Integer): Integer;
begin
  Result :=
    _MessageBoxW_(StrToInt(ExpandConstant('{wizardhwnd}')), Message, Caption, Flags);
end;

    Thanks to all for your help!

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