ihigh - ilow command some issue

[Abdul Salam]

for(int j=2; j<20; j++)

     { 

      if(iHigh( "USDCHF" , PERIOD_H1 ,j)-iLow( "USDCHF" , PERIOD_H1 ,j)>=200*Point)

        {

         K=j;

         return true;

         break;

i want to detect only buy or sell candle at a time.

what additional setting i do for it