Pineify logo

Code migration guide

thinkScript to MQL5 converter

A declarative thinkScript study or strategy needs a full MQL5 program structure: series expressions become array or handle calculations, plots become indicator buffers, and simulated AddOrder logic becomes an optional Expert Advisor trade system.

Open the MQL5 Coding AgentReview MQL5 AI Coding Agent

Generate an MQL5 draft, then compile it in MetaEditor 5 and test the target account mode in MetaTrader 5.

Conversion map

What changes between thinkorswim and MetaTrader 5

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
LifecycleDeclarative expressions are evaluated over chart data; studies, strategies, scans, and watchlist columns have different contexts.Programs respond to typed events such as OnInit, OnTick, OnTradeTransaction, and OnCalculate.Choose when each thinkorswim calculation should run in MetaTrader 5; matching syntax alone does not preserve timing.
Market data and historyDefinitions and plots form time series and access prior values with bracket indexing or recursive definitions.Timeseries and indicator values are commonly copied into arrays; built-in indicators return handles read with CopyBuffer.Recheck bar indexing, warm-up requirements, timeframe requests, and behavior on an unfinished bar.
Indicators and chart outputStudies use def, plot, painting, and built-in study functions to render chart analysis.Indicator handles, buffers, plots, and OnCalculate separate setup from repeated calculation.Map calculations before recreating plots, labels, colors, and platform-specific drawing objects.
Orders and positionsStrategies use AddOrder to add simulated orders to charts; platform conditional orders are a separate workflow.Trade requests and CTrade operate with orders, deals, and account-dependent position models.Define fill timing, sizing, pyramiding or hedging, stops, and position ownership for the target platform.
Native validationPaste into thinkScript Editor, save it as the correct study or strategy, add it to a chart, and inspect plots or the strategy report.Compile the .mq5 file in MetaEditor 5, load it in MetaTrader 5, and use Strategy Tester for the intended artifact.Treat generated MQL5 as a draft until it passes the target editor, chart, and backtest workflow.

Code example

Moving-average cross: thinkScript to MQL5

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.

thinkScript source fragment
def fast = Average(close, 10);
def slow = Average(close, 20);
plot longSignal = fast crosses above slow;
MQL5 target 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];

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 a thinkScript study or strategy definition.

  2. 2

    Choose the target artifact

    Decide whether the result is an .mq5 Expert Advisor or custom indicator. This choice controls lifecycle methods and available APIs.

  3. 3

    Rewrite through target APIs

    Translate state, series, indicators, drawings, and orders into MetaTrader 5 concepts instead of replacing function names.

  4. 4

    Validate behavior natively

    Compile the .mq5 file in MetaEditor 5, load it in MetaTrader 5, and use Strategy Tester for the intended artifact.

Manual decisions

Decisions code replacement cannot make

  • Choose an MQL5 custom indicator or Expert Advisor before translating any declarations.
  • Add explicit initialization, buffer sizing, warm-up checks, and event callbacks absent from thinkScript.
  • Treat AddOrder as a backtest signal specification, then design MT5 risk and position behavior separately.

Limitations

What the draft cannot prove

  • thinkorswim and MetaTrader 5 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 MetaTrader 5.
  • Pineify can generate and revise a MQL5 draft, but the target platform remains the authority for compilation, loading, backtesting, and runtime behavior.

Use cases

When this conversion is useful

  • Turn a thinkorswim study into an MT5 custom indicator.
  • Rebuild thinkScript strategy signals as an MQL5 Expert Advisor.
  • Add MT5 runtime controls around calculations first written for a chart.

FAQ

thinkScript to MQL5 questions

Official references

Build the MQL5 draft with its native model in view

Bring the complete source and your artifact, timing, data, and order requirements. Validate the result in MetaTrader 5.

Open the MQL5 Coding AgentProduct details