How to execute a batch file on uninstall in Inno S

问题:

I'm using code from How do you execute command line tools without using batch file in Inno Setup response to execute all my batch files on installation (before, after).

No I want to execute them just when user click "YES" to uninstaller, but can't find a way to do it. It executes before the confirmation

Here is my code from [Code] section:

function InitializeUninstall(): Boolean;
var
  ResultCode : Integer;    
begin
  Result := True;
  Exec(ExpandConstant('{app}\scripts\unset.bat'), '', '',
       SW_HIDE, ewWaitUntilTerminated, ResultCode); 
end; 

回答1:

Move your code to the CurUninstallStepChanged(usUninstall). That event is triggered after the confirmation of uninstallation.

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
var
  ResultCode : Integer;    
begin
  if CurUninstallStep = usUninstall then
  begin
    Exec(ExpandConstant('{app}\scripts\unset.bat'), '', '',
         SW_HIDE, ewWaitUntilTerminated, ResultCode); 
  end;
end;

---

Though it's easier to use [UninstallRun] section.

[UninstallRun]
Filename: "{app}\scripts\unset.bat"; Flags: runhidden

The section is also processed after the confirmation, but before any files are uninstalled. See Uninstallation order.

---

Note that in general, you should not use batch files. You better script everything in Pascal code. That way you get much more robust code and error handling.