Skip Preparing to Install Wizard page in Inno Setup

Referring to the question Basic or Advanced installation mode choice to skip or use advanced options pages, I need to skip the Preparing to Install wizard page now.

In my case this page is displayed because one or more programs are using files that need to be replaced by the installer; so the installer asks to the user if they want the setup to automatically close the applications and restart at the end of the setup.

I need that this page is hide from the setup process in Basic mode, and if some files are used, that the setup automatically closes the applications using them without asking anything to the user.

I've tried editing ShouldSkipPage as:

function ShouldSkipPage(PageID: Integer): Boolean; 
begin 
  { If "Basic" mode is selected, skip Directory and Components pages }
  Result := 
    ModePage.Values[0] and
    ((PageID = wpSelectDir) or (PageID = wpSelectComponents) or (PageID = wpReady) or (PageID = wpPreparing));
end;

adding (PageID = wpPreparing) but the page still displayed in Basic mode.

Is there a way to implement this using Inno Setup?

Solution

ShouldSkipPage event is not even called for wpPreparing. That page is not to be skipped.

If you still want to skip it, you have to use hacks like these:

With the first approach, your code would look like:

[Code]
const
  BN_CLICKED = 0;
  WM_COMMAND = $0111;
  CN_BASE = $BC00;
  CN_COMMAND = CN_BASE + WM_COMMAND;

procedure CurPageChanged(CurPageID: Integer);
var
  Param: Longint;
begin
  { If Basic mode is selected, skip Preparing page }
  if (CurPageID = wpPreparing) and ModePage.Values[0] then
  begin
    Param := 0 or BN_CLICKED shl 16;
    PostMessage(WizardForm.NextButton.Handle, CN_COMMAND, Param, 0);
  end;
end;