Require an uninstallation password

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(Ask a password to uninstall)
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Revision as of 20:25, 3 February 2007

Some Inno Setup user need to ask for a password to uninstall the software. The code below shows how to create a form, ask for a password, and uninstall software only if the password is correct.

This system is very weak, it's easy to find out the password, so who want to use this way to protect from uninstallation have to code somenthing safer, also if the user want to uninstall and doesn't know the password, colud anyway delete files of even the folder. In this sample the uninstall password is removeme.

[Setup]
AppName=UninsPassword
AppVerName=UninsPassword
DisableProgramGroupPage=true
DisableStartupPrompt=true
DefaultDirName={pf}\UninsPassword

[Code]
function AskPassword(): Boolean;
var
  Form: TSetupForm;
  OKButton, CancelButton: TButton;
  PwdEdit: TPasswordEdit;
begin

  Result := false;
  Form := CreateCustomForm();
  try
    Form.ClientWidth := ScaleX(256);
    Form.ClientHeight := ScaleY(100);
    Form.Caption := 'Uninstall Password';
    Form.BorderIcons := [biSystemMenu];
    Form.BorderStyle := bsDialog;
    Form.Center;

    OKButton := TButton.Create(Form);
    OKButton.Parent := Form;
    OKButton.Width := ScaleX(75);
    OKButton.Height := ScaleY(23);
    OKButton.Left := Form.ClientWidth - ScaleX(75 + 6 + 75 + 50);
    OKButton.Top := Form.ClientHeight - ScaleY(23 + 10);
    OKButton.Caption := 'OK';
    OKButton.ModalResult := mrOk;
    OKButton.Default := true;

    CancelButton := TButton.Create(Form);
    CancelButton.Parent := Form;
    CancelButton.Width := ScaleX(75);
    CancelButton.Height := ScaleY(23);
    CancelButton.Left := Form.ClientWidth - ScaleX(75 + 50);
    CancelButton.Top := Form.ClientHeight - ScaleY(23 + 10);
    CancelButton.Caption := 'Cancel';
    CancelButton.ModalResult := mrCancel;
    CancelButton.Cancel := True;

    PwdEdit := TPasswordEdit.Create(Form);
    PwdEdit.Parent := Form;
    PwdEdit.Width := ScaleX(210);
    PwdEdit.Height := ScaleY(23);
    PwdEdit.Left := ScaleX(23);
    PwdEdit.Top := ScaleY(23);

    Form.ActiveControl := PwdEdit;

    if Form.ShowModal() = mrOk then
    begin
      Result := PwdEdit.Text = 'removeme';
      if not Result then
            MsgBox('Wrong password it''s not possible uninstall.', mbInformation, MB_OK);
    end;
  finally
    Form.Free();
  end;
end;


function InitializeUninstall(): Boolean;
begin
  Result := AskPassword();
end;
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