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Code migration guide

MQL5 to thinkScript converter

An MQL5 indicator may be reduced to a thinkScript study, but an EA cannot carry its event-driven trade engine into thinkorswim; only supported chart calculations, alerts, and simulated strategy signals should be migrated.

Open the thinkScript Coding AgentReview thinkorswim AI Coding Agent

Generate a thinkScript draft, then save and test it in the thinkorswim editor as the intended study or strategy.

Conversion map

What changes between MetaTrader 5 and thinkorswim

The migration is a model translation. Use this map to decide where the source behavior belongs before writing target syntax.

Source and target platform conversion map
ConcernSource modelTarget modelMigration decision
LifecyclePrograms respond to typed events such as OnInit, OnTick, OnTradeTransaction, and OnCalculate.Declarative expressions are evaluated over chart data; studies, strategies, scans, and watchlist columns have different contexts.Choose when each MetaTrader 5 calculation should run in thinkorswim; matching syntax alone does not preserve timing.
Market data and historyTimeseries and indicator values are commonly copied into arrays; built-in indicators return handles read with CopyBuffer.Definitions and plots form time series and access prior values with bracket indexing or recursive definitions.Recheck bar indexing, warm-up requirements, timeframe requests, and behavior on an unfinished bar.
Indicators and chart outputIndicator handles, buffers, plots, and OnCalculate separate setup from repeated calculation.Studies use def, plot, painting, and built-in study functions to render chart analysis.Map calculations before recreating plots, labels, colors, and platform-specific drawing objects.
Orders and positionsTrade requests and CTrade operate with orders, deals, and account-dependent position models.Strategies use AddOrder to add simulated orders to charts; platform conditional orders are a separate workflow.Define fill timing, sizing, pyramiding or hedging, stops, and position ownership for the target platform.
Native validationCompile the .mq5 file in MetaEditor 5, load it in MetaTrader 5, and use Strategy Tester for the intended artifact.Paste into thinkScript Editor, save it as the correct study or strategy, add it to a chart, and inspect plots or the strategy report.Treat generated thinkScript as a draft until it passes the target editor, chart, and backtest workflow.

Code example

Moving-average cross: MQL5 to thinkScript

These fragments show where the same signal starts in each API. They are not complete standalone programs; lifecycle setup, inputs, plots, and order handling still depend on the selected artifact.

MQL5 source fragment
double fast[2], slow[2];
CopyBuffer(fastHandle, 0, 0, 2, fast);
CopyBuffer(slowHandle, 0, 0, 2, slow);
bool longSignal = fast[0] <= slow[0] && fast[1] > slow[1];
thinkScript target fragment
def fast = Average(close, 10);
def slow = Average(close, 20);
plot longSignal = fast crosses above slow;

Workflow

A four-step migration path

Keep generation, target-platform validation, and behavior comparison as separate stages.

  1. 1

    Inventory the source behavior

    Separate calculations, plots, alerts, orders, external dependencies, and assumptions in an .mq5 Expert Advisor or custom indicator.

  2. 2

    Choose the target artifact

    Decide whether the result is a thinkScript study or strategy definition. This choice controls lifecycle methods and available APIs.

  3. 3

    Rewrite through target APIs

    Translate state, series, indicators, drawings, and orders into thinkorswim concepts instead of replacing function names.

  4. 4

    Validate behavior natively

    Paste into thinkScript Editor, save it as the correct study or strategy, add it to a chart, and inspect plots or the strategy report.

Manual decisions

Decisions code replacement cannot make

  • Separate reusable indicator math from MQL5 account, file, network, and trade services.
  • Translate arrays and handle buffers into declarative thinkScript series with supported history depth.
  • Treat EA entries as optional AddOrder simulations, not as equivalent live MT5 execution.

Limitations

What the draft cannot prove

  • MetaTrader 5 and thinkorswim do not share one execution, data, or order model, so behavior can change even when both versions compile.
  • Broker, symbol, session, timezone, history, and fill settings can change signals and backtest results on thinkorswim.
  • Pineify can generate and revise a thinkScript draft, but the target platform remains the authority for compilation, loading, backtesting, and runtime behavior.

Use cases

When this conversion is useful

  • Recreate an MT5 indicator as a thinkorswim study.
  • Display EA signals as chart markers or a simulated strategy.
  • Port calculations while explicitly dropping MT5-only runtime behavior.

FAQ

MQL5 to thinkScript questions

Official references

Build the thinkScript draft with its native model in view

Bring the complete source and your artifact, timing, data, and order requirements. Validate the result in thinkorswim.

Open the thinkScript Coding AgentProduct details