MQL5 compiler diagnostic
MQL5 OnCalculate entry point not found is compiler code 209. An indicator source does not contain either exact documented int OnCalculate signature, or its name, return type, parameter types, references, or const modifiers differ. Copy one official signature exactly and keep it at global scope.
Open the Coding Agent and choose MQL5 from the language menu.
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 1
double Output[];
int OnInit()
{
return SetIndexBuffer(0,Output,INDICATOR_DATA) ? INIT_SUCCEEDED : INIT_FAILED;
}
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
for(int i=MathMax(prev_calculated-1,0);i<rates_total;i++)
Output[i]=close[i];
return rates_total;
}MetaEditor reports 'oncalculate' entry point not found for the indicator when the source cannot satisfy the language or API contract at that location. Compile errors prevent creation of the EX5 program until they are resolved.
Start with the first error in the build output. A missing delimiter, declaration, or include can make later lines produce secondary messages that disappear after the root cause is fixed.
Compare the exact failing line with its declaration and the official reference. Keep the compiler line and column in the repair prompt or issue report.
Choose one of the two documented OnCalculate forms and reproduce it exactly. Return rates_total after populating the buffers, and return zero only when the indicator intentionally has no values to show.
Compile after each coherent edit. When the first diagnostic moves or disappears, re-read the remaining list instead of applying stale fixes from the previous build.
The handler matches the documented full timeseries signature and returns rates_total. Real indicator logic still needs buffer direction and history guards appropriate to its loop.
A clean compile or a cleared error code does not prove strategy logic, broker compatibility, backtest quality, or live-trading safety. Reproduce the result in the target MetaTrader 5 terminal and account environment.
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 1
double Output[];
int OnInit()
{
return SetIndexBuffer(0,Output,INDICATOR_DATA) ? INIT_SUCCEEDED : INIT_FAILED;
}
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
for(int i=MathMax(prev_calculated-1,0);i<rates_total;i++)
Output[i]=close[i];
return rates_total;
}Pineify can generate or revise MQL5 source and use MQL5 compilation diagnostics during the coding workflow. Keep the exact error, source location, program type, and intended behavior in the request so the change remains reviewable.
Open MQL5 Coding AgentPineify does not run your broker terminal, Strategy Tester, market data, or live orders. Validate the final program in your own MetaTrader 5 environment.
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Record the message, code 209, file, line, and column from MetaEditor 5.
Open the first failing line and inspect the declaration, delimiters, include dependencies, and nearby syntax before touching later messages.
Choose one of the two documented OnCalculate forms and reproduce it exactly. Return rates_total after populating the buffers, and return zero only when the indicator intentionally has no values to show.
Press F7, confirm the compiler result, then run the EA, indicator, or script in the appropriate MetaTrader 5 test environment.
The official MQL5 compilation table defines code 209 as "'OnCalculate' entry point not found for the indicator."
No. Fix the first credible root error and compile again. One malformed statement can create several downstream diagnostics.
No. Compilation validates source and type contracts. Runtime behavior, order handling, strategy logic, and broker compatibility require separate tests.
Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.
Provide the exact diagnostic and intended behavior, inspect the generated change, compile it, and verify it in your MT5 test environment.
Open MQL5 Coding Agent