>I'm not sure if it's even safe to launch MessageBox() from the server.

Really? Why?


>The server I'm working on hse to sit there 24x7 logging realtime data so it has to do all it can survive errors. I think you'll just have to seed conditional code around the parts that can error out to skip the rest of the processing. The Error method can set a nLastError property that could be tested after each line that can give you errors and conditionally return the error to the client. I don't really know of a way to rollback the entire callstack from inside the error method. There isn't really a MASTER to return to since you are just running the method the client requested. I've got code like this in my server.

I think you may be right here. It is unfortunate though. The last thing I want to do is test for an error every other line.

What I ended up doing was using 'try...except' handler in Delphi. Like this. It actually works pretty well.

try
      // Call the Method
      //
      s := oDataDll.GetARDataByDate(StartDate,EndDate);
    except  
      // Method was canceled
      //     
      on E: Exception do
      begin
        ShowMessage('An error occurred!');
        exit;
      end;
    end;

If the method in the server gets CANCELled, the 'on E' code fires and I probably can write some code that explains a bit more about what had happened.

This has been an experience. Thanks to all you guys for all your help.