MQL4自编指标学习3
MQL4自编指标学习3-Close[] Open[] High[] Low[] IndicatorCounted()学习1 预定义数组Close[]Open[] High[] Low[]学习四个数据是预定义数据，保存当前图表每个柱子的开盘、收盘、最高、最低的价格，本文仅以Close[]数组进行学习，其他三个原理相同。
Series array that contains close prices for each bar of the current chart.
Series array elements are indexed in the reverse order, i.e., from the last one to the first one. The current bar which is the last in the array is indexed as 0. The oldest bar, the first in the chart, is indexed as Bars-1.
int handle = FileOpen("file.csv", FILE_CSV|FILE_WRITE, ";");
if(handle>0)
{
// table column headers recording
FileWrite(handle, "Time;Open;High;Low;Close;Volume");
// data recording
for(int i=0; i<Bars; i++)
{
FileWrite(handle, Time, Open, High, Low, Close, Volume);
}
FileClose(handle);
}
2 函数IndicatorCounted()学习
Returned value
The amount of bars not changed after the indicator had been launched last.
Note
The most calculated bars do not need any recalculation. In most cases, same count of index values do not need for recalculation. The function is used to optimize calculating.
int limit;
int counted_bars=IndicatorCounted();
//---- check for possible errors
if(counted_bars<0)
return(-1);
//---- the last counted bar will be recounted
if(counted_bars>0)
{
Print(counted_bars);//2018.11.28 13:32:22.843 柱体标号索引学习 EURUSD,Monthly: 269
counted_bars--;
}
limit=Bars-counted_bars;
//---- main loop
for(int i=0; i<limit; i++)
{
//---- ma_shift set to 0 because SetIndexShift called abowe
ExtBlueBuffer=iMA(NULL,0,5,0,MODE_SMMA,PRICE_MEDIAN,i);
}
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