Demo_IndicatorSetString

//+------------------------------------------------------------------+
//|                                      Demo_IndicatorSetString.mq5 |
//|                        Copyright 2012, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2012, MetaQuotes Software Corp."
#property link      "http://www.mql5.com"
#property version   "1.00"
#property indicator_separate_window
//--- set the maximum and minimum values for the indicator window
#property indicator_minimum 0
#property indicator_maximum 100
//--- show three horizontal levels in a separate indicator window
#property indicator_level1 30
#property indicator_level2 50
#property indicator_level3 70
//--- set the color of horizontal levels
#property indicator_levelcolor clrRed
//--- set the style of horizontal levels
#property indicator_levelstyle STYLE_SOLID
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- set the descriptions of horizontal levels 
   IndicatorSetString(INDICATOR_LEVELTEXT,0,"First Level (index 0)");
   IndicatorSetString(INDICATOR_LEVELTEXT,1,"Second Level (index 1)");
   IndicatorSetString(INDICATOR_LEVELTEXT,2,"Third Level (index 2)");
//--- set the short name for the indicator
   IndicatorSetString(INDICATOR_SHORTNAME,"IndicatorSetString() Demo");
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//---
   
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+