MQL4参考图表操作 ChartGetString

ChartGetString

Returns the value of a corresponding property of the specified chart. Chart property must be of string type. There are 2 variants of the function call.

1. Returns the property value directly.

string  ChartGetString(
   long  chart_id,          // Chart ID
   int   prop_id            // Property ID
   );

2. Returns true or false, depending on the success of a function. If successful, the value of the property is placed in a target variable string_var passed by reference.

bool  ChartGetString(
   long    chart_id,        // Chart ID
   int     prop_id,         // Property ID
   string& string_var       // Target variable for the property
   );

Parameters

chart_id

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

prop_id

[in] Chart property ID. This value can be one of the ENUM_CHART_PROPERTY_STRING values.

string_var

[out] Target variable of string type for the requested property.

Return Value

The value of string type.

For the second call case it returns true if the specified property is available and its value has been stored into string_var variable, otherwise returns false. To get additional information about the error, it is necessary to call the function GetLastError().

Note

ChartGetString can be used for reading comments plotted on the chart using the Comment or ChartSetString functions.

Example:

void OnStart()
  {
   ChartSetString(0,CHART_COMMENT,"Test comment.\nSecond line.\nThird!");
   ChartRedraw();
   Sleep(1000);
   string comm=ChartGetString(0,CHART_COMMENT);
   Print(comm);
  }