Running code only after successful uninstallation in Inno Setup

Question

Is it possible to handle event when user clicks NO in uninstallation confirmation prompt?

And if NO is clicked, don't execute DeinitializeUninstall() ?

Or is it possible to handle NO button from DeinitializeUninstall() function?

Basically, I wont to avoid DelTree here:

procedure DeinitializeUninstall();
begin
  { if we are running in /SILENT mode, then this is an overinstall - }
  { don't delete additional folder}
  if not UninstallSilent() then
  begin
    DelTree(ExpandConstant('{#BSPLOC}'),True, True, True);
  end;
end;

Answer 1

I believe your logic is wrong. It looks like XY problem.

I do not think, that you want to detect "No". I believe, you want to run the code during or after uninstallation.

So use an event function that matches your requirements. The function is CurUninstallStepChanged. And depending on when you exactly need the code to run, check for a corresponding value of CurUninstallStep argument (usUninstall, usPostUninstall or usDone).

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
  if CurUninstallStep = usDone then
  begin
    { ... }
  end;
end;

For similar questions, see:

• Inno Setup: Conditionally delete non-empty directory in user's home folder
• How to save a folder when user confirms uninstallation? (Inno Setup)

---

Ntb, it also seems that you abuse the /SILENT switch to detect if the uninstaller is run automatically as part of some process (upgrade?). What if the user runs the uninstaller silently him/herself? You should add another custom switch to signal the automatic run. But that's another question.