85 lines
2.3 KiB
Markdown
85 lines
2.3 KiB
Markdown
|
# GetDouble
|
|||
|
|
|
|||
|
|
Provides simplified access to the functions of API MQL5 [ObjectGetDouble()](/en/docs/objects/objectgetdouble) to receive double values (of float and double types) of a graphical object bound to a class instance. There are two versions of the function call:
|
|||
|
|
|
|||
|
|
Getting a property value without checking the correctness
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
double GetDouble(
|
|||
|
|
ENUM_OBJECT_PROPERTY_DOUBLE prop_id, // integer property ID
|
|||
|
|
int modifier=-1 // modifier
|
|||
|
|
) const
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
Parameters
|
|||
|
|
|
|||
|
|
prop_id
|
|||
|
|
|
|||
|
|
[in] ID of the graphical object double property.
|
|||
|
|
|
|||
|
|
modifier=-1
|
|||
|
|
|
|||
|
|
[in] Modifier (index) of a double property.
|
|||
|
|
|
|||
|
|
Return Value
|
|||
|
|
|
|||
|
|
Value of a double property - success, [EMPTY_VALUE](/en/docs/constants/namedconstants/otherconstants) - cannot receive a double property.
|
|||
|
|
|
|||
|
|
Getting a property value in verifying the correctness of such treatment
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
bool GetDouble(
|
|||
|
|
ENUM_OBJECT_PROPERTY_DOUBLE prop_id, // double property ID
|
|||
|
|
int modifier, // modifier
|
|||
|
|
double& value // link to a variable
|
|||
|
|
) const
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
Parameters
|
|||
|
|
|
|||
|
|
prop_id
|
|||
|
|
|
|||
|
|
[in] ID of a graphical object double property.
|
|||
|
|
|
|||
|
|
modifier
|
|||
|
|
|
|||
|
|
[in] Modifier (index) of a double property.
|
|||
|
|
|
|||
|
|
value
|
|||
|
|
|
|||
|
|
[out] Link to a variable to place a double property value.
|
|||
|
|
|
|||
|
|
Return Value
|
|||
|
|
|
|||
|
|
true - success, false - cannot get a double property.
|
|||
|
|
|
|||
|
|
Example:
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
//--- example for CChartObject::GetDouble
|
|||
|
|
#include <ChartObjects\ChartObject.mqh>
|
|||
|
|
//---
|
|||
|
|
void OnStart()
|
|||
|
|
{
|
|||
|
|
CChartObject object;
|
|||
|
|
//---
|
|||
|
|
for(int i=0;i<object.LevelsCount();i++)
|
|||
|
|
{
|
|||
|
|
//--- get levels value by easy method
|
|||
|
|
printf("Level %d value=%f",i,object.GetDouble(OBJPROP_LEVELVALUE,i));
|
|||
|
|
//--- get levels value by classic method
|
|||
|
|
double value;
|
|||
|
|
if(!object.SetDouble(OBJPROP_LEVELVALUE,i,value))
|
|||
|
|
{
|
|||
|
|
printf("Get double property error %d",GetLastError());
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
printf("Level %d value=%f",i,value);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
```
|