Learn New MQL Coding

Quoting mindyyost

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Finally... I can say with confidence that the Buy Scenario - Limit Trades Only - WORKS fine. Check that puppy off the list! You know - what would really be nice would be to have some kind of audible when a scenario initiates it's first order so that it would call my attention back to it. Also maybe an audible when all open trades in a series become profitable... Don't know how much work that would be, I'm just dreaming of perfection - and that is just a suggestion - not a request.

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Quoting tradista

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Great thread you have here, congratulations! Do you know a quicker way to debug MQL code besides using the "print" or "comment" functions. I know about using the "debugview" tool also but I was wondering if you happen to be using something better for a more structured approach to debugging and testing. thanks!

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Quoting MehZhure

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Hey ya broketrader! Since you have been busy helping mindy with her expert, I had posted a question about an issue over on stackoverflow. It seems nobody over there has any ideas. Granted, this is a very odd situation. Basically, I have finished my indicator, and now the indicator cannot find the function in the dll. I have verified, with a program called the Dependency Walker, that the function name has not been mangled during the export. In short, I cannot find any reason why the indicator cannot find the function name. If you are interested in...

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// Declaration
extern "C"  MT4_EXPFUNC bool __stdcall LiveChart( bla, bla, bla );
 
// Definition
MT4_EXPFUNC bool __stdcall LiveChart( bla, bla, bla ) {
   Observatory astronomer;
   return astronomer.OnCalculateLive( bla, bla, bla );
}

Quoting broketrader

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{quote} From what I see, there is no declaration of the function but only it's body. Try this in your dll source : // Declaration extern "C" MT4_EXPFUNC bool __stdcall LiveChart( bla, bla, bla ); // Definition MT4_EXPFUNC bool __stdcall LiveChart( bla, bla, bla ) { Observatory astronomer; return astronomer.OnCalculateLive( bla, bla, bla ); }

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extern "C" MT4_EXPFUNC bool __stdcall LiveChart(const BarTrack &bars, Stars &points, Patterns *gartleys, Patterns *bats,
            Patterns *butterflies, Patterns *cyphers, const BarData *rates, Basics &basics);

Quote

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IntelliSense: linkage specification is incompatible with previous "LiveChart"

Quoting broketrader

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Hi MehZhure, Sometimes some lines of code are better than a thousand words. Could you post a little example of your C and C# code that makes your Ninjatrader to crash, so I can replicate locally ? It's long time I haven't played with C#/C++ so it's difficult to respond as is.

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#define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
BOOL APIENTRY DllMain(HMODULE hModule,
    DWORD  ul_reason_for_call,
    LPVOID lpReserved
    )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}
struct TestStruct
{
    int x, y;
} testy[2];
extern "C" __declspec(dllexport) TestStruct __stdcall TestFunk(int *x, int *y)//TestStruct **testy )
{
    testy[0].x = x[0] + 1;
    testy[0].y = y[0] + 1;
    testy[1].x = x[1] + 1;
    testy[1].y = y[1] + 1;
     return &testy;

}

namespace NinjaTrader.Indicator
{
    public class TestIndicator : Indicator
    {    
        [StructLayout(LayoutKind.Sequential)]
        public struct TestStruct
        {
            public int x, y;    
        }
        TestStruct[] testy = new TestStruct[2];
        
        int[] x = new int[2];
        int[] y = new int[2];
        
        protected override void Initialize()
        {
            Overlay                = true;
        }
        
        protected override void OnBarUpdate()
        {
            if(CurrentBar < Count - 2) {return;}
            
            x[0] = 10; x[1] = 20;
            y[0] = 2; y[1] = 9;
            
            tesy = GetDLL.TestFunk(ref x, ref y);
            Print("X0: " + testy[0].x.ToString() + "  Y0: " + testy[0].y.ToString());
            Print("X1: " + testy[1].x.ToString() + "  Y1: " + testy[1].y.ToString());
        }
        
        class GetDLL
        {
            GetDLL() {}
            ~GetDLL() {}
            [DllImport("testdll.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "TestFunk")]
            public static extern TestStruct TestFunk(
                [In,MarshalAs(UnmanagedType.LPArray)] ref int[] x,
                [In,MarshalAs(UnmanagedType.LPArray)] ref int[] y );
        }
        #region Properties
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
 
 
namespace DLLTest
{
   [StructLayout(LayoutKind.Sequential)]
   public struct TestStruct
   {
      public int x, y;
   }
   class GetDLL
   {
      GetDLL() { }
      ~GetDLL() { }
      [DllImport("DLL.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "TestFunk")]
      public static extern TestStruct TestFunk( ref TestStruct x, ref TestStruct y );
   }
   class Program
   {
      static TestStruct[] testy = new TestStruct[2];
      static void Main(string[] args) {
         testy[0].x = 10; testy[0].y = 2;
         testy[1].x = 20; testy[1].y = 9;
 
         GetDLL.TestFunk( ref testy[0], ref testy[1] );
         Console.WriteLine( "X0: " + testy[0].x.ToString() + "  Y0: " + testy[0].y.ToString());
         Console.WriteLine( "X1: " + testy[1].x.ToString() + "  Y1: " + testy[1].y.ToString());
      }
   }
 
}

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
 
BOOL APIENTRY DllMain( HMODULE, DWORD, LPVOID ) {
    return TRUE;
}
struct TestStruct
{
    int x, y;
};
extern "C" __declspec(dllexport) void __stdcall TestFunk( void *x, void *y )
{
    TestStruct* ptX = (TestStruct*)x;
    TestStruct* ptY = (TestStruct*)y;
    ptX->x += 1;
    ptX->y += 1;
    
    ptY->x += 1;
    ptY->y += 1;
}

Quote

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Cannot marshal 'return value': Invalid managed/unmanaged type combination.

Quoting MehZhure

Disliked

Nope. I tried it and got the following error message. {quote}

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...
 
class GetDLL {
   GetDLL() { }
   ~GetDLL() { }
   
   [DllImport("DLL.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "TestFunk")] public static extern void TestFunk( ref       TestStruct x, ref TestStruct y );
}
 
...