Inno Setup - Check if multiple folders exist

问题

I have a custom uninstall page, which is invoked with this line:

UninstallProgressForm.InnerNotebook.ActivePage := UninstallConfigsPage;

Now, this just shows the page every time the uninstaller is run, but I need it to show only if certain folders exist (there's 6 of them). I could make an if statement with a bunch of or's, but I'm wondering if there's a neater way to do it.

回答1:

In general, there's no better way than calling DirExists for each folder:

if DirExists('C:\path1') or
   DirExists('C:\path2') or
   DirExists('C:\path3') then
begin
  { ... }
end;

Though, when processing a set of files/folders, it's advisable to have their list stored in some container (like TStringList or array of string), to allow their (repeated) bulk-processing. You already have that (Dirs: TStringList) from my solution to your other question.

var
  Dirs: TStringList;
begin
  Dirs := TStringList.Create();
  Dirs.Add('C:\path1');
  Dirs.Add('C:\path2');
  Dirs.Add('C:\path2');
end;

function AnyDirExists(Dirs: TStringList): Boolean;
var
  I: Integer;
begin
  for I := 0 to Dirs.Count - 1 do
  begin
    if DirExists(Dirs[I]) then
    begin
      Result := True;
      Exit;
    end;
  end;

  Result := False;
end;

But I know from your other question, that you map all the paths to checkboxes. Hence, all you need to do, is to check, if there's any checkbox:

if CheckListBox.Items.Count > 0 then
begin
  UninstallProgressForm.InnerNotebook.ActivePage := UninstallConfigssPage;

  { ... }

  if UninstallProgressForm.ShowModal = mrCancel then Abort;

  { ... }

  UninstallProgressForm.InnerNotebook.ActivePage := UninstallProgressForm.InstallingPage;
end;

来源：https://stackoverflow.com/questions/44274005/inno-setup-check-if-multiple-folders-exist

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inno-setup

pascal

pascalscript