- Expert Advisors main event: OnTick
- Basic principles and concepts: order, deal, and position
- Types of trading operations
- Order types
- Order execution modes by price and volume
- Pending order expiration dates
- Margin calculation for a future order: OrderCalcMargin
- Estimating the profit of a trading operation: OrderCalcProfit
- MqlTradeRequest structure
- MqlTradeCheckResult structure
- Request validation: OrderCheck
- Request sending result: MqlTradeResult structure
- Sending a trade request: OrderSend and OrderSendAsync
- Buying and selling operations
- Modying Stop Loss and/or Take Profit levels of a position
- Trailing stop
- Closing a position: full and partial
- Closing opposite positions: fill and partial
- Placing a pending order
- Modifying a pending order
- Deleting a pending order
- Getting a list of active orders
- Order properties (active and historical)
- Functions for reading properties of active orders
- Selecting orders by properties
- Getting the list of positions
- Position properties
- Functions for reading position properties
- Deal properties
- Selecting orders and deals from history
- Functions for reading order properties from history
- Functions for reading deal properties from history
- Types of trading transactions
- OnTradeTransaction event
- Synchronous and asynchronous requests
- OnTrade event
- Monitoring trading environment changes
- Creating multi-symbol Expert Advisors
- Limitations and benefits of Expert Advisors
- Creating Expert Advisors in the MQL Wizard
Types of trading operations
Trading in MQL5 is implemented by sending orders using the OrderSend function. We will study it in one of the following sections because its description requires you to first become familiar with several concepts.
The very first new concept will be the trading operation type. Each trade request contains an indication of the type of the requested trade and allows you to perform actions such as opening and closing positions, as well as placing, modifying, and deleting pending orders. All types of trading operations are described in the ENUM_TRADE_REQUEST_ACTIONS enumeration.
Identifier |
Description |
|---|---|
TRADE_ACTION_DEAL |
Place a trading order for an immediate trade with the specified parameters (place a market order) |
TRADE_ACTION_PENDING |
Place a trading order to execute a trade under the specified conditions (pending order) |
TRADE_ACTION_SLTP |
Change the Stop Loss and Take Profit values of an open position |
TRADE_ACTION_MODIFY |
Change the parameters of a previously placed order |
TRADE_ACTION_REMOVE |
Delete a previously placed pending order |
TRADE_ACTION_CLOSE_BY |
Close a position with an opposite one |
When requesting TRADE_ACTION_DEAL and TRADE_ACTION_PENDING, the program will need to specify a specific order type. This is another important concept that has its own reflection in the MQL5 API, and we will consider it in the next section.