MQL4 Reference 
Window functions WindowBarsPerChart
| int WindowBarsPerChart( |
) |
Function returns the amount of bars visible on the chart.
Sample:
// work with visible bars.
int bars_count=WindowBarsPerChart();
int bar=WindowFirstVisibleBar();
for(int i=0; i<bars_count; i++,bar--)
{
// ...
}
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