Unable to access NtDirect from C#

[trader_rick]

Hi,

I am trying to access the NtDirect functionality from within C# but am not meeting success so far.

I have tried 2 methods;

1) Add a reference to NtDirect.dll from within a C# project. I get the message;

"A reference to 'C:\WINDOWS\System32\NtDirect.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component."

2) I tried a direct link from within the source using;

using System.Runtime.InteropServices;

class Test
{
[DllImport( "NTDirect.dll" )]
public extern static int Connected( int showMessage );
public static void Main( string[] args )
{
int connectStatus = Connected( 1 );
}
}

I then get an error message saying;

"Failed to initialize COM library (0x80010106)"

I know that futures_shark says he has been able to get this method to succeed but I haven't. Similarly, including references to NinjaTrader.Client.dll (which I can get to successfully link in) as he suggests does not give access to the NtDirect functions.

Any ideas as to what I'm doing wrong?

many thanks

[NinjaTrader_Dierk]

NTDirect is a plain, old C DLL, you can not access it like a C# assembly. You would need to make yourself familiar with the .NET interop concept to understand how you access plain, old C DLLs from C# (hint: search for dllimport in the MS docs).

[trader_rick]

Hi Dierk

Thanks for quick response. My message got sent before I'd finished typing as you can see from the updated message. Yes, I have been trying DllImport as I wasn't sure whether NtDirect was a managed dll or not. Thanks for letting me know. I will go away and try again but if you have any additional quick suggestions, I would appreciate them.

many thanks

[NinjaTrader_Dierk]

Hmm ... COM setup always is weird. You could try going through a uninstall/reinstall cycle.

[trader_rick]

Tried that. No luck. Anybody else out there managed to get this working?

[Futures_Shark]

When adding a reference to your c# project, browse for Ninjatrader.Client.Dll

then in your code put this line

NinjaTrader.Client.Client NTClient = new NinjaTrader.Client.Client();

and this line will submit an order.

NTClient.Command("PLACE","Sim101","ES 03-08","BUY",1,"LIMIT",1245.00,0,"GTC","ax1234","","" ,"");

ANother thing is to make sure you have the AT interface is selected on Ninjatrader otherwise your app is ignored with no error message.

[trader_rick]

Thanks buddy, that was what I needed to know.

In the meantime I'd managed to get it working in Python!

Thanks once again.