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How to bypass tick triggering?

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Hi,

"int start()" works when new tick arrives. But I want to do this: in WEEKEND, (so no tick arrives), I'll use MT4's history function, say, go back to 2005-1-1, and press "F12" again and again, to do some exercise. In the middle of it, I'll draw some arrows on chart...... Now I need a block of code to process these arrows. The tough part is at what time the code could tell new arrow added.

In this case, I need to bypass tick triggering. Maybe "run the code every one minute" or something ?

Any good idea?
Write your trigger at begin of start function. Sample for triggering EA one time per bar
static datetime prevtime=0;
...
if(prevtime == Time[0]) return(0);
prevtime = Time[0];



For every minute this code may be changed to:

static datetime prevtime=0;
...
datetime minute=iTime(NULL,PERIOD_M1,0);
if(prevtime == minute) return(0);
prevtime = minute;



Thanks, but I don't quite understand....
I'm going to try some endless loop to bypass tick trigger.

And another question please: when I try another code, "Symbol()" seems to be weird.
......
string sym=Symbol();
  
Print(sym);


nothing happened.

I wrote a code, which causes DEADLOCK:

#property copyright "Copyright ?2006, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_chart_window
int init()
  {
   return(0);
  }
int deinit()
  {
   return(0);
  }
static int prev=0;

int start()
  {
   int i=ObjectsTotal(); 
   int lastbar=WindowFirstVisibleBar()-WindowBarsPerChart();
   int j,handle;
   
   while (1>0)
     {
       if(lastbar != prev)
         {  handle=FileOpen("mydata.csv",FILE_CSV|FILE_WRITE,',');
            for (j=i-1; j>=0; j--)
              if(ObjectType(ObjectName(j))==OBJ_ARROW && handle>0) 
                {  FileWrite(handle,
                     ObjectGet(ObjectName(j),OBJPROP_ARROWCODE),
                     ObjectGet(ObjectName(j),OBJPROP_PRICE1)
                     );
                } 
            FileClose(handle);
            prev=lastbar;    
         }
     }     
//----
   return(0);
  }
//+------------------------------------------------------------------+



Why?

endless loop
while (1>0)
Thanks.

Have a good weekend !
I've done quite some learning and trial......Guess I'm just one step from success now.

I got the following script, which will work also in weekdays .
The last things I don't know :
1, Why the .CSV file always shows:0,0,0,0 (in two row), or empty, even if I press F12 and draw new arrow again and again?
2, I used an Array to include each arrow's time and name. But should I define the Array as "datetime" or "string"?

int start()
  {
    int prev=0;
    int prevarrow=0,arrowtotal; // drawn on the chart
    int lastvisiblebar;    // index of it 
    int i,j,handle;
    string namearray[][2]; //will sort arrowname by time,in case arrows change orders  but indexes do not
    
    while (1>0) // endless loop, thanks to Sleep()....
      { 
        lastvisiblebar=WindowFirstVisibleBar()-WindowBarsPerChart();
        //======= if press F12 then =============================
        if(lastvisiblebar != prev)  
          {
            i=ObjectsTotal();
            arrowtotal=0;    //reset to 0 after write file
            //---- make arrows an Array ------
            for (j=0; j<i; j++)   
              if(ObjectType(ObjectName(j))==OBJ_ARROW) // rule out trendlines, etc.
                { 
                  namearray[j][0]=ObjectGet(ObjectName(j),OBJPROP_TIME1); // sort
                  namearray[j][1]=ObjectName(j);
                  arrowtotal++;
                }
              Comment("prevarrow=" +prevarrow +"   arrowtotal=" +arrowtotal +"    lastvisbar=" +lastvisiblebar);                 
            
            //---- if new arrows added then --------------------
            if(arrowtotal!=prevarrow) 
              {
                ArraySort(namearray);  // sort by time
                handle=FileOpen("mydata.csv",FILE_CSV|FILE_WRITE,';');
                if(handle>1)    // write arrows to a file, in time order
                   {                   
                      for (j=0;j<ArrayRange(namearray,1);j++)
                        FileWrite(handle,
                            ObjectGet(namearray[j,1],OBJPROP_ARROWCODE),
                            ObjectGet(namearray[j,1],OBJPROP_PRICE1));
                      FileClose(handle);
                   }
                prevarrow=arrowtotal;    
              }
            //-------------------------------------------------
            prev=lastvisiblebar;            
          }
        //=====================================================  
        Sleep(4000);  
      }     
    return(0);
  }







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