MQL4 Reference 
Object functions ObjectsDeleteAll
| int ObjectsDeleteAll( |
int window=EMPTY, int type=EMPTY) |
Removes all objects of the specified type and in the specified sub-window of the chart. The function returns the count of removed objects.
To get the detailed error information, one has to call the GetLastError() function.
Notes: The chart sub-windows (if there are sub-windows with indicators in the chart) are numbered starting from 1. The chart main window always exists and has the 0 index.
If the window index is missing or it has the value of -1, the objects will be removed from the entire chart.
If the type value equals to -1 or this parameter is missing, all objects will be removed from the specified sub-window.
Parameters:
| window |
- |
Optional parameter. Index of the window in which the objects will be deleted. Must exceed or equal to -1 (EMPTY, the default value) and be less than WindowsTotal(). |
| type |
- |
Optional parameter. An object type to be deleted. It can be any of the Object type enumeration values or EMPTY constant to delete all objects with any types. |
Sample:
ObjectsDeleteAll(2, OBJ_HLINE); // all horizontal lines are removed from the 2nd sub-window.
ObjectsDeleteAll(2); // all objects are removed from the 2nd sub-window.
ObjectsDeleteAll(); // all objects are removed from the chart.
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