How to monitor/catch Windows even that has been emited from Desktop application?

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1

I have Click activity that clicks/invokes ‘Refersh Data’ button, that - in its turn - retrieves data from database and puts these data into some grid and also emits custom Windows event, just posts this event.

I am using Delphi code for emitting/posting event:

uses
  SysUtils, Windows;

  procedure EmitRPAActivityCompletedEvent;

implementation

//GPT
procedure EmitRPAActivityCompletedEvent;
var
  hEvent: THandle;
begin
  // Create an event with a unique name
  hEvent := CreateEvent(nil, True, False, 'MyApp_ActivityCompletedEvent');

  if hEvent = 0 then
    raise Exception.Create('Failed to create the event');
    
  try
    // Set the event to signaled state
    SetEvent(hEvent);
  finally
    // Close the event handle
    CloseHandle(hEvent);
  end;
end;

And I just want to monitor for this event, catch this even in my UiPath workflow as unambigous evidence that my workflow can continue execution. Something like ‘Wait for’ activity if there was such activity.

GPT suggested me to use ‘Invoke Code’ activity with C# code:

using System.Runtime.InteropServices;
using System.Threading;

[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);

[DllImport("kernel32.dll", SetLastError = true)]
static extern bool WaitForSingleObject(IntPtr hHandle, uint dwMilliseconds);

public void WaitForCustomEvent()
{
    // Open the event by its unique name
    IntPtr hEvent = CreateEvent(IntPtr.Zero, false, false, "MyApp_ActivityCompletedEvent");

    if (hEvent != IntPtr.Zero)
    {
        // Wait for the event to be signaled, with a timeout (in milliseconds)
        WaitForSingleObject(hEvent, 60000); // E.g. 60 seconds timeout
    }
}

But this code does not compile even I am pasting the body only in the ‘Code’ Field and event after I have added necessary workspaces to ‘Imports’ of the workflow.

So, ‘Invoke Code’ is not appropriate. I have tried ‘Trigger Scope’ and ‘Triggers’, but I see no way to indicate that my triggers should listen to some Windows event.

2

I added ‘Application Event Trigger’ to the ‘Triggers’ section of my ‘Triger Scope’. This trigger has my application as the default application, but ‘Event type’ is ‘None’ and there is no other values in the drop-down list.