Calling MarketData from DLL freezes Tradestation

[moscu]

I have create an study in tradestation that would plot the bid/ask from the connected data feed. I wrapped the following DLL symbols into TS functions:

SubscribeMarketData
UnsubscribeMarketData
MarketData
My indicator calls SubscribeMarketData then it calls the wrapper for MaketData passing the 0,1,2 for bid/ask/last.

As soon as I load the indicator the whole tradestation freezes and I have to restart. I know the problem is in marketdata because when I comment/uncomment the problem shows/disappear.

My MaketData is as follows:


DefineDLLFunc: "NtDirect.dll", int, "MarketData", lpstr, double;
inputs: PriceType(numericsimple);
NTMarketData = MarketData(GetSymbolName, PriceType);


Thanks,

Moscu

[NinjaTrader_Dierk]

Incorrect declaration. Try
DefineDLLFunc: "NtDirect.dll", int, "MarketData", lpstr, int;

Where did you find the wrong one?

[moscu]

That did it

Dierk,

Thanks that help, but the return was also wrong so here is the correct version:

DefineDLLFunc: "NtDirect.dll", double, "MarketData", lpstr, int;
inputs: PriceType(numericsimple);
NTMarketData = MarketData(GetSymbolName, PriceType);

I think NT should wrap all this functions by default instead of the user having to do this.


Moscu