MQL4常用的常量及函数

常用的量及函数

Ask      The latest known seller's price (ask price) for the current symbol. The RefreshRates() function must be used to update.
Bid        The latest known buyer's price (offer price, bid price) of the current symbol. The RefreshRates() function must be used to update
MarketInfo   Returns various data about securities listed in the "Market Watch" window 
    To obtain the current market information there are several functions: SymbolInfoInteger(), SymbolInfoDouble() and SymbolInfoString(). The first parameter is the symbol name, the values of the second function parameter can be one of the identifiers of ENUM_SYMBOL_INFO_INTEGER, ENUM_SYMBOL_INFO_DOUBLE and ENUM_SYMBOL_INFO_STRING.
  
Open[]                         Series array that contains open prices of each bar of the current chart.
Close[]    Series array that contains close prices for each bar of the current chart.
High[]                         Series array that contains the highest prices of each bar of the current chart.
Low[]                           Series array that contains the lowest prices of each bar of the current chart.
iOpen                          Returns Open price value for the bar of specified symbol with timeframe and shift.
      double  iOpen(
      string           symbol,          // symbol
      int              timeframe,       // timeframe
      int              shift            // shift
     );
iClose  Returns Close price value for the bar of specified symbol with timeframe and shift.
  double  iClose(
      string           symbol,          // symbol
      int              timeframe,       // timeframe
      int              shift            // shift
    );
iHigh  Returns High price value for the bar of specified symbol with timeframe and shift.
  double  iHigh(
      string           symbol,          // symbol
      int              timeframe,       // timeframe
      int              shift            // shift
     );
iHighest  Returns the shift of the maximum value over a specific number of bars depending on type.
  int  iHighest(
      string           symbol,          // symbol
      int              timeframe,       // timeframe
      int              type,            // timeseries
      int              count,           // cont
      int              start            // start
    );

iLowest  Returns the shift of the lowest value over a specific number of bars depending on type.
  int  iLowest(
      string           symbol,          // symbol
      int              timeframe,       // timeframe
      int              type,            // timeseries id
      int              count,           // count
      int              start            // starting index
    );

 

自带指标的调用

iMA  Calculates the Moving Average indicator and returns its value.
  double  iMA(
      string       symbol,           // symbol
      int          timeframe,        // timeframe
      int          ma_period,        // MA averaging period
      int          ma_shift,         // MA shift
      int          ma_method,        // averaging method
      int          applied_price,    // applied price
      int          shift             // shift
     );
iCCI  Calculates the Commodity Channel Index indicator and returns its value
  double  iCCI(
      string       symbol,           // symbol
      int          timeframe,        // timeframe
      int          period,           // averaging period
      int          applied_price,    // applied price
      int          shift             // shift
     );

自定义指标的调用：
iCustom      Calculates the specified custom indicator and returns its value
  double  iCustom(
     string       symbol,           // symbol
     int          timeframe,        // timeframe
     string       name,             // path/name of the custom indicator compiled program
     ...                            // custom indicator input parameters (if necessary)
     int          mode,             // line index
     int          shift             // shift
   );