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Hello,

According to to the documentation, instance.parameters should change when ChangeParameters() is called. In my tests, I do not see this happening. In the following test code output, final line (top) should have parameters changed to m15, 10, but the values are not changed. It seems example code in documentation has the same issue.
Am I doing something wrong, or is it a bug in Trading Station?
TS version: 01.15.081619

Code: Select all

Symbol   Strategy/Indicator   Message   Time
EUR/USD   TEST m15 10   Trace: 'Current parameters: m1; 1'.   2020-07-06 12:12:31
EUR/USD   TEST m15 10   Trace: 'ExtAsyncOperationFinished called.'.   2020-07-06 12:12:31
EUR/USD   TEST m15 10   Trace: 'Current parameters: m1; 1'.   2020-07-06 12:12:26
EUR/USD   TEST m15 10   Trace: 'ExtAsyncOperationFinished called.'.   2020-07-06 12:12:26
EUR/USD   TEST m15 10   Trace: 'Current parameters: m1; 1'.   2020-07-06 12:12:12
EUR/USD   TEST m15 10   Trace: 'ChangeParameters called.'.   2020-07-06 12:12:12
EUR/USD   TEST m15 10   Trace: 'New parameters: m15; 10'.   2020-07-06 12:12:12
EUR/USD   TEST m15 10   Trace: 'Current parameters: m1; 1'.   2020-07-06 12:12:12
EUR/USD   TEST m15 10   Trace: 'CheckParameters called.'.   2020-07-06 12:12:12
EUR/USD   TEST m15 10   TEST m1 1 is started.   2020-07-06 12:12:00
   TEST m15 10   Trace: 'Current parameters: m1; 1'.   2020-07-06 12:12:00
   TEST m15 10   Trace: 'Prepare called.'.   2020-07-06 12:12:00


Test code (opening/closing trade prints current parameters):

Code: Select all

function Init()
    strategy:name("Test");
    strategy:description("");
    strategy:type(core.Strategy);
   
    strategy.parameters:addString("t", "t", "", "m1");
    strategy.parameters:setFlag("t", core.FLAG_PERIODS);
    strategy.parameters:addInteger("i", "i", "", 1);
end

function Prepare(name_only)
    instance:name(string.format("%s %s %i",profile:id(),instance.parameters.t,instance.parameters.i));
    if not name_only then
        log("Prepare called.");
        printParameters();
        core.host:execute("subscribeTradeEvents", 1000, "trades");
    end
end

function ReleaseInstance()
    log("ReleaseInstance called.");
    printParameters();
end

function CheckParameters(params)
    log("CheckParameters called.");
    printParameters();
    log("New parameters: %s; %i",params.t, params.i);
    return string.format("%s %s %i",profile:id(),params.t,params.i);
end

function ChangeParameters()
    log("ChangeParameters called.")
    printParameters();
end

function ExtUpdate(id, source, period)
    log("ExtUpdate called.");
    printParameters();
end

function ExtAsyncOperationFinished(cookie, success, message, message1, message2)
    log("ExtAsyncOperationFinished called.");
    printParameters();
end

function log(text, ...)
    core.host:trace(string.format(text, unpack(arg)));
end

function printParameters()
    log("Current parameters: %s; %i",instance.parameters.t, instance.parameters.i);
end

dofile(core.app_path() .. "\\strategies\\standard\\include\\helper.lua");


Thank you, but removing ChangeParameters() from the program results in data loss, and does not really solve the issue of documentation describing the function inaccurately.

Your request is added to the development list.
Development reference 1892.

Can not do much, it looks line an FXTS2 bug.