calling scripts from indicator

Quoting Charlo

Disliked

Did you change all commands from A to W as it is written in one of the posts: Replace all PosMessageA with PostMessageW and RegisterWindowMessageA with RegisterWindowMessageW. This has been so since build 600+, when W (wide) or Unicode form of the functions was introduced.

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Quoting buju

Disliked

...if anyone reading this has experience with c/c++ coding windows .dll's and could help me out with this...

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//#property show_inputs         // no inputs dialog

// pseudo code (for documentation only)
 
#define MT4_LOAD_STANDARD_INDICATOR      13
#define MT4_LOAD_CUSTOM_INDICATOR        15
#define MT4_LOAD_EXPERT                  14
#define MT4_LOAD_SCRIPT                  16
 
int hWnd = WindowHandle();
string scriptName = "MyScript";
PostMessage(hWnd, WM_MT4(), MT4_LOAD_SCRIPT, GetStringAddress(scriptName));

Quoting buju

Disliked

emmzett thank you for the explanation , but I've used a hot key solution in the end. - set up a hot key in mt4 on the script , in this case ctrl-M - used this code to call it: ..... keybd_event(17, 0x9d, 0, 0); // Ctrl Press keybd_event(77, 0x9e, 0, 0); // ‘M’ Press keybd_event(77, 0x9e, KEYEVENTF_KEYUP, 0); // ‘M’ Release keybd_event(17, 0x9d, KEYEVENTF_KEYUP, 0); // Ctrl Release

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Quoting buju

Disliked

ideally my vision was to pass inputs to the script and the script would automatically execute, my implementation does not do this , I have thought of a workaround , and that is for the script to read global variables , but that could be problematic if the GV's are not updated or outdated.

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Quoting buju

Disliked

ideally my vision was to pass inputs to the script and the script would automatically execute, my implementation does not do this , I have thought of a workaround , and that is for the script to read global variables , but that could be problematic if the GV's are not updated or outdated.

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/* INDICATOR "manager" */
#property strict
#property indicator_chart_window
#define     EVENT_REQ_SAY_HELLO  3
#define     EVENT_RESP_SAY_HELLO 4
#define     XEVENT(EVENT) (CHARTEVENT_CUSTOM+EVENT)
ulong g_micro_timer = 0;
int OnInit()
{  
   Comment("WORKER_EXAMPLE_IND click chart for test");
   return(INIT_SUCCEEDED);
}
int start(){return 0;}
 
void OnChartEvent(const int id,
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
{
   /*Simple example:
      1. User clicks chart
      2. Indicator sends mssg to worker
      3. Worker sends response.
      4. Indicator receives response
      5. Alerts user with worker response mssg
   */
   if(id == CHARTEVENT_CLICK) {
      for(long c=ChartFirst(); c>=0; c=ChartNext(c))
         EventChartCustom(c, EVENT_REQ_SAY_HELLO, ChartID(), 0.0, "");
      g_micro_timer = GetMicrosecondCount();
      return;
   }
   if(id == XEVENT(EVENT_RESP_SAY_HELLO)) {
      ulong round_trip_time = GetMicrosecondCount() - g_micro_timer;
      Alert(StringFormat("Mssg('%s') | round trip micros: %d",
         sparam, round_trip_time
      ));
   }
}

/* EXPERT "Worker" */
#property   strict
#define     EVENT_REQ_SAY_HELLO  3
#define     EVENT_RESP_SAY_HELLO 4
#define     XEVENT(EVENT) (CHARTEVENT_CUSTOM+EVENT)
int OnInit()
{  
   Comment("WORKER_EXAMPLE_EXPERT");
   return(INIT_SUCCEEDED);
}
void OnTick(){}
//+------------------------------------------------------------------+
void OnChartEvent(const int id,
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
{
   if(id == XEVENT(EVENT_REQ_SAY_HELLO)) {//incoming event is custom user event
      EventChartCustom(                   //sending custom response via chart events
         lparam,                          //targeting the chart id that was sent in the lparam from request
         EVENT_RESP_SAY_HELLO,            //setting the event id for the receiving program
         ChartID(),                       //sending this chart id in the lparam
         0.0,                             //nothing to send in the dparam, but this could be anything
         say_hello()                      //sending string response, this has a limit in chars so large messages should be passed via file refs
      );
   }
}
//+------------------------------------------------------------------+
string say_hello()
{
   return "Hello from worker EA! :)";
}

Quoting Nicholishen

Disliked

Instead take advantage of custom chart events...

Ignored

Quoting robots4me

Disliked

{quote} Holy smokes -- are you saying you can use custom events to communicate between charts -- sort of like WM_COPY messages (if you are familiar with old Win32 programming)? That is way too cool. Thank you, Nicholishen.

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Quoting Nicholishen

Disliked

You can also run workers to place up to 8 concurrent asynchronous trade actions before you run into the trade context busy error (limit)

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Quoting emmzett

Disliked

Great to hear you got it working. In between I added the launcher functions for any MQL program to my DLL.

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Quoting robots4me

Disliked

{quote} ...Thanks very much -- your program launcher is a wonderful tool.

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