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❌ CloseOrder (GoMT4)

Goal: correctly close an open market order (BUY/SELL) with retry logic and proper rounding.

Real code refs:

  • Account methods: examples/mt4/MT4Account.go (OrderClose)
  • Example: examples/mt4/MT4_service.go (ShowOrderCloseExample)

✅ 1) Preconditions

  • You know the ticket of the order you want to close.
  • The order is open (check via ShowOpenedOrders or similar).
  • MT4 terminal is running & connected.

🔍 2) Get order & quote

ord, err := account.OrderByTicket(ctx, ticket)
if err != nil { return err }

q, err := account.Quote(ctx, ord.GetSymbol())
if err != nil { return err }

⚙️ 3) Prepare close params

  • Use Bid to close a BUY.
  • Use Ask to close a SELL.
  • Round price to Digits.
info, _ := account.SymbolParams(ctx, ord.GetSymbol())
digits := int(info.GetDigits())

var closePrice float64
if ord.GetType() == pb.OrderType_OP_BUY {
    closePrice = roundPrice(q.GetBid(), digits)
} else if ord.GetType() == pb.OrderType_OP_SELL {
    closePrice = roundPrice(q.GetAsk(), digits)
}

slippage := int32(5)

📝 4) Call OrderClose

resp, err := account.OrderClose(
    ctx,
    ticket,
    ord.GetVolume(),
    &closePrice,
    &slippage,
)
if err != nil {
    return fmt.Errorf("close failed: %w", err)
}
fmt.Printf("✅ Closed ticket=%d at price=%.5f time=%s\n",
    ticket, resp.GetPrice(), resp.GetCloseTime().AsTime())

⚠️ Pitfalls

  • Invalid price → always round to Digits.
  • Wrong side → BUY closes at Bid, SELL closes at Ask.
  • Partial close → adjust volume parameter if closing partially.
  • Timeout → wrap in context.WithTimeout(ctx, 5*time.Second).
  • Retries → transport errors auto‑retried inside helper.

🔄 Variations

  • Partial close: send smaller volume than ord.GetVolume().
  • Loop over all open orders: call ShowOpenedOrders → close each.
  • Close by order: see CloseByOrders.md recipe.

🔗 See also

  • ModifyOrder.md — adjust SL/TP instead of closing.
  • DeletePending.md — remove a pending order.
  • HistoryOrders.md — verify closed orders in history.