Debug for mq4

[jugivi Juan]

Good afternoon, I wanted to know if there is some software that can do debug to mq4 program. Thank you.

[Simon Gniadkowski]

jugivi:
Good afternoon, I wanted to know if there is some software that can do debug to mq4 program. Thank you.

Yes, Comment(), Print() & Alert() . . they are all you have.

[jugivi Juan]

Thanks, is what I'm using, but ...

[William Roeder]

RaptorUK: Yes, Comment(), Print() & Alert() . . they are all you have.

1. Which do not work under optimization. And DebugView which work always:

   /** Log
   * send information to OutputDebugString() to be viewed and logged by
   * SysInternal's DebugView (free download from microsoft) This is ideal for
   * debugging as an alternative to Print(). The function will take up to 10
   * stringa (or numeric) arguments to be concatenated into one debug message.
   //*/
   #import "kernel32.dll"
      void OutputDebugStringA(string msg);
   #import
   void Log(string s1,    string s2="", string s3="", string s4="", string s5="",
            string s6="", string s7="", string s8="", string s9="", string s10=""){
       if (IsDllsAllowed()){
           string out  = WindowExpertName() + ": "
                       + s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10;
           OutputDebugStringA(out);
       }
   }
   

2. An in the tester/visual mode you can call PauseTest()
   

   /*                                          PauseTest
   // https://forum.mql4.com/35112
   // Each chart consists of two windows (i.e. two hWnds): the drawing area (WH,)
   // and a container (GA.) There is then a standard MDI container which holds all
   // the chart windows (GA1.) And that sits inside the main MT4 window (GA2.)
   */
   #include <WinUser32.mqh>
   #import "user32.dll"
     int GetAncestor(int, int);
   #import
   void PauseTest(){   datetime now = TimeCurrent();   static datetime oncePerTick;
       if( oncePerTick != now  )if( IsTesting()
       )if( IsVisualMode()     )if( IsDllsAllowed()    ){  oncePerTick = now;
           for(int i=0; i<200000; i++){        // Delay required for speed=32 (max)
               if (IsStopped()) break;         // https://forum.mql4.com/32837 WH-DL
               int main = GetAncestor(WindowHandle(Symbol(), Period()), 2);//GA_ROOT
               if (i==0) PostMessageA(main, WM_COMMAND, 0x57a, 0); // 1402. Pause
       }   }
       // The PostMessage above sends the command to the main terminal. Thus it
       // only affects the active chart window. To maximize a window for example
       // must activate it first. https://forum.mql4.com/35336#538848
       // See also SetForgroundWindow(h) https://www.mql5.com/en/code/10146
   }