Hello
I'm working with TestStand 2014 (32 bit) and Visual C# 2008 EE.
I wrote a DLL in C# to control a USB device. I have managed to instantiate an object of the main class from the DLL in TestStand. I can call methods in the DLL and they execute properly.
The DLL has a way to publish events from the USB device by receiving a delegate (an overloaded constructor) and then calling it asynchronously when an event occurs. A .NET Windows Form can actually pass a delegate to the DLL and the DLL calls the delegated method when the event occurs. The Windows Form just verifies that the event is processed correctly by analyzing the InvokeRequired property:
/// <summary>
/// Catch messages from the API
/// </summary>
/// <param name="message"></param>
public void catchDLLStatus(string message)
{
if (this.InvokeRequired)
{
this.Invoke(new model_b_api.Model_B_Status_Delegate(catchDLLStatus), message);
}
else
{
writeConsole(lstConsole, message);
}
}The delegate type that the DLL calls is very simple:
//Delegate that publishes status messages to the caller
public delegate void Model_B_Status_Delegate(string message);All of this works as a charm in a C# Form that calls the DLL for the USB device.
However, in TestStand, I can only perform calls to the DLL, but I have no idea on how to implement the same delegates that the DLL would require to publish asynchronous events. I could modify the DLL to publish custom events (EventHandler perhaps), but I also do not know how I would service them in TestStand.
I am new at TestStand, so, please forgive if this question is out of place. I've looked everywhere, but I only have found LabView examples.
Can TestStand pass delegate methods to a DLL or handle events from a DLL?
Thanks!
Santiago
).
