EFS Study not working correctly in 10.5

[GregSchroeder]

I upgraded to 10.5 and an EFS Study I wrote to do automated trading thru DLL calls has stopped working correctly. It still runs and some of the function calls still work.

I rolled the installation back to 10.4 and the study works correctly.

Before I start to debug the problem, I wanted to see if anyone else was having a related problem with 10.5 and EFS.

Thanks,
Greg

[Doji3333]

I have not upgraded yet to 10.5. Maybe they changed something with dll handling?

I'm sure a technician from esignal will reply to this one.

[eSignal_JasonK]

Hello Greg,

We have not received any other reports of the problem you're describing. We would like to investigate this further. Can you provide more specific details as to the functions that have stopped working? If you can isolate the issues and put together a basic sample dll that can be used to reproduce the problem it would be very helpful.

Thanks,

[GregSchroeder]

Hi Jason,
I finally figured out what the problem was. In version 10.4, if a variable was left out of a DLL call, the variable defaulted to 0. In 10.5 it defaults to something else (I'm not sure what). The solution was to explicitly include the variable in the DLL call.

Original code (worked in 10.4, but not 10.5)
d.addFunction("ProcessMsgs",DLL.STRING, DLL.CDECL, "?fProcessMessages@@YAPBDH@Z");

Revised code (works in 10.5)
d.addFunction("ProcessMsgs",DLL.STRING, DLL.CDECL, "?fProcessMessages@@YAPBDH@Z", DLL.INT);

Greg

[eSignal_JasonK]

Hello Greg,

Thanks for the update. I'll pass this along to our engineering team to investigate further.

[eSignal_JasonK]

Hello Greg,

Our engineers have investigated and confirmed that there has not been any intentional changes to the behavior of this function. However, we did add some error handling/tracing routines that may be changing the stack that is causing this problem. We can't undo those changes, however. You will need to specify the parameter types going forward. We'll update the documentation and make the parameter type a required input for future users.