MQL4 Reference Constants, Enumerations and Structures Data Structures Structure for Current Prices
The Structure for Returning Current Prices (MqlTick)
This is a structure for storing the latest prices of the symbol. It is designed for fast retrieval of the most requested information about current prices.
The variable of the MqlTick type allows obtaining values of Ask, Bid, Last and Volume within a single call of the SymbolInfoTick() function.