Question

I am trying to convert C# project to Delphi, the C# code itself is importing functions from native dll let us name it ‘dmp.dll’ which I don’t have the signature of its native functions and I have to look at how these functions are imported in c# and try to import them in Delphi code, and I did import a lot of them and they work fine, but now I am struggling with this function (StartLogging). This is how they imported in C#:

[DllImport("dmp.dll", CharSet = CharSet.Auto, EntryPoint = "StartLogging")]
public static extern int StartLogging(String AdapterName, 
  PLOG_RECORD_CALLBACK LogRecordCallback, 
  SafeWaitHandle StopLoggingEvent);

no problem about PLOG_RECORD_CALLBACK, but the problem is on this parameter SafeWaitHandle which is class exists in Microsoft.Win32.SafeHandles namespace. How can I port it to Delphi? What is the equivalent data type to it in Delphi?

And here is how they use it in the C# Code:

AutoResetEvent StopEvent = new AutoResetEvent(false);

The class AutoResetEvent exists in System.Threading
Then they call the method like this:

StartLogging(comboBox1.Text, CallbackProcedure, StopEvent.SafeWaitHandle);

Then at the last and to stop the logging they use:

StopEvent.Set();

I am really confused and I don’t know how to do this, appreciate your help.
Thanks

Answer 1

You can probably use SyncObjs TEvent. If you create it with the ManualReset argument set to False, it should work about the same way. Just pass the Event.Handle (which is a THandle and is compatible with anything in the API expecting one).

I don’t have a sample of using a non-manual reset event, but an example of creating a TEvent can be found in the accepted answer here; to make it a non-manually reset (IOW, AutoReset), just change the second parameter to False.