Compiler Fixes

Fix MQL5 indicator values with handles and CopyBuffer.

In MQL5, indicator functions such as iMA and iRSI usually return an indicator handle. The EA then reads values with CopyBuffer. Treating the call like an MQL4 direct value often creates compile errors or silent signal bugs.

Search intent

The developer gets wrong-parameter, undeclared, or zero-value indicator errors after moving MT4 indicator logic into MQL5.

Paste compiler errors / Generate EA draft / Get risk check

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Create handles in OnInit

Indicator handles should be created once, checked against INVALID_HANDLE, and reused. Recreating handles on every tick makes debugging harder.

Create iMA/iRSI/iStochastic handles in OnInit

Check INVALID_HANDLE

Release handles in OnDeinit

Read values with CopyBuffer

Use CopyBuffer to pull the current and previous values into arrays. Then make signal decisions from those arrays.

Copy at least two or three bars

Check the copied count

Use ArraySetAsSeries when reading [0] and [1] as current/previous

Separate signal from execution

Once indicator values are valid, the EA still needs spread, session, exposure, stop, and retcode checks before trading.

Signal function

Risk gate

Execution function

Use the tool

Paste the indicator block into Workfusion Debugger to convert MT4-style indicator calls into an MQL5 handle + CopyBuffer flow.

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Related guides

Continue the EA build path.

MT4 Debugging

MQL4 to MQL5 migration checklist

A practical checklist for moving Expert Advisor logic from MT4 to MT5 without breaking order handling.

Compiler Fixes

MQL5 OnInit and OnTick EA skeleton

A clean MT5 Expert Advisor skeleton structure for OnInit, OnTick, risk gates, signal checks, and execution.

Code Review

MQL5 code review before backtesting

Review lifecycle, execution, risk, inputs, and logs before spending time on MT5 Strategy Tester runs.