I want to write a custom trailing stop, the code snippets like this

if MarketPosition <> 0 then
begin
tStopLoss = VerifyStopLoss(value4, AvgValue, OrderSlot, BuyOrSell, LogLevel);

if tStopLoss <> 0 then
begin
value4 = tStopLoss;
end;

if BuyOrSell <> 0 then
begin
sell next bar at value4 stop;
end
else
begin
buytocover next bar at value4 stop;
end;
end;

the VerifyStopLoss function will caculate the new stop price and i know it work correctly, now the problem is that no any stop order will be submitted while the sa model is turned on, i dont know why.

kissdish,

it's hard for anyone to guess what could be the problem without being able to check the values from the function. You should add print commands to your code and check the values yourself to see if they are correct. This will help you to track the issue down.

Regards,
ABCTG

thank you for your reply, i have checked the function and ensure it will return correct value, now i wondered is there anything wrong i use the sell and buytocover command, as no any stop order be submitted. does anyone know that if i want to write a custom trailing stop, what function or command is the standard method, setstoploss?

kissdish 

i have checked the function and ensure it will return correct value, now i wondered is there anything wrong i use the sell and buytocover command, as no any stop order be submitted.

Do you have an open position when this script is applied to the chart? That's all I can guess based on the information you've provided.

kissdish 

does anyone know that if i want to write a custom trailing stop, what function or command is the standard method, setstoploss?

The code snippet that you showed already is a custom stop; you only need to make it trailing. If you implement SetDollarTrailing() then it won't be custom anymore.

thanks for your replay, i have solved this problem, the reason is the marketpostion will always return 0 while the SA is turned on, it's incorrect, maybe some bug with the broker's plug-in, i change a broker or use marketpostion_at_broker and the code run well. thank you all