Returns a structure array MqlBookInfo containing records of the Depth of Market of a specified symbol.
[in] Symbol name.
[in] Reference to an array of Depth of Market records. The array can be pre-allocated for a sufficient number of records. If a dynamic array hasn't been pre-allocated in the operating memory, the client terminal will distribute the array itself.
Returns true in case of success, otherwise false.
The Depth of Market must be pre-opened by the MarketBookAdd() function.