MQL4参考图表操作 ChartSetString

ChartSetString

Sets a value for a corresponding property of the specified chart. Chart property must be of the string type. The command is added to chart message queue and executed only after all previous commands have been processed.

bool  ChartSetString(
   long     chart_id,      // Chart ID
   int      prop_id,       // Property ID
   string   str_value      // Value
   );

Parameters

chart_id

[in] Chart ID. 0 means the current chart.

prop_id

[in] Chart property ID. Its value can be one of the ENUM_CHART_PROPERTY_STRING values (except the read-only properties).

str_value

[in] Property value string. String length cannot exceed 2045 characters (extra characters will be truncated).

Return Value

Returns true if the command has been added to chart queue, otherwise false. To get error details use the GetLastError() function.

Note

ChartSetString can be used for a comment output on the chart instead of the Comment function.

Example:

void OnTick()
  {
//---
   double Ask,Bid;
   int Spread;
   Ask=SymbolInfoDouble(Symbol(),SYMBOL_ASK);
   Bid=SymbolInfoDouble(Symbol(),SYMBOL_BID);
   Spread=SymbolInfoInteger(Symbol(),SYMBOL_SPREAD);
   string comment=StringFormat("Printing prices:\nAsk = %G\nBid = %G\nSpread = %d",
                               Ask,Bid,Spread);
   ChartSetString(0,CHART_COMMENT,comment);
  }