Single Instance

If you wish that there can only be a single copy of your application built with AutoPlay Media Studio, TrueUpdate or Setup Factory running at all times, then you can use the sample Lua code below.

AutoPlay Media Studio

This sample will ask to close the application if you exit it manually, however if there is already another instance running, the new program will exit silently.

Place this into the Global Functions:

 
function QueryAllowProjectClose()
  if (g_SilentShutdown) then
    return true;
  else
    -- ask for permission to close
    local result = Dialog.Message("Confirmation", "Are you sure that you want to quit?", 
      MB_YESNO, MB_ICONEXCLAMATION, MB_DEFBUTTON1);
    if result == IDYES then
      -- end the application
      return true;
    else
      -- continue 
      return false;
    end
  end
end

Place this into On Startup:

 
local found = 0;
-- set here the Window Title of your application, see Project > Settings
local sWindowTitle = "Demo - Powered by AutoPlay Media Studio";
tApplications = Window.EnumerateTitles(true);
for handle, title in pairs(tApplications) do
  if (String.Find(title, sWindowTitle, 1, false) ~= -1) then
    found = found + 1;
  end
end
if (found > 0) then
  -- Another instance of the application is already running
  g_SilentShutdown = true;
  Application.Exit(0);
else
  g_SilentShutdown = false;
end

TrueUpdate

In this sample code, I assume that the executable is built using the default name, TrueUpdateClient.exe. If this is not the case, edit the script as required.

The same code can be used for Setup Factory or Visual Patch as well.

Place this at the beginning of the Client Script:

 
local nFound = 0;
local sExecutable = "trueupdateclient.exe"; -- process names are always lowercase
local tProcesses = Window.EnumerateProcesses(true);
local nMyWindowHandle = Application.GetWndHandle();
local nProcessWindow = 0;
 
for nWindowHandle, sProcessName in pairs(tProcesses) do
  sFile = String.SplitPath(sProcessName);
  -- strip the path and compare only filename and extension
  if (String.Lower(sFile.Filename .. sFile.Extension)) == sExecutable then
    nFound = nFound + 1;
    if (nMyWindowHandle ~= nWindowHandle) then
      nProcessWindow = nWindowHandle;
    end
  end
end
 
if nFound > 1 then
  -- try to bring the other application to the front
  Window.SetOrder(nProcessWindow,  HWND_TOP);
  -- as another sExecutable was found, do not proceed further
  Application.Exit(0);
end