isNull

1.00

GAGlobal

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Description

Description:

Checks whether the tested item is Null.
Which null type the item has to be equal to depends on the type of object tested:

• Objects -> objNull
• Controls -> controlNull
• Displays -> displayNull
• Groups -> grpNull
• Locations -> locationNull (since ARMA 2)
• Tasks -> taskNull (since ARMA 2)

Note: A test via == does not work, because, for example, objNull is not equal to anything, not even to itself.

Groups:

Uncategorised

Syntax

Syntax:

isNull obj

Parameters:

obj: Object, Control, Display, Group (or Location, Task since ARMA 2)

Return Value:

Boolean

Examples

Example 1:

if (isNull obj) then {hint "doesn't exist";};

Additional Information

See also:

controlNulldisplayNullgrpNulllocationNullobjNulltaskNullteamMemberNull

Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord.
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Notes

Posted on September 04, 2014

Pierre MGI

locationNull could be confusing when testing destinationTask : if a task is created, taskDestination returns an array working as position : _mytask_distance = (taskDestination (currentTask player)) distance player;
When task completed Hint format ["%1", taskDestination (currentTask player)] returns <null> while !isnull taskdestination..
leads to an error.
correct test : _destination_task = taskDestination (currentTask player); if (!isNil "_destination_tsk") then {...

}}

Posted on September 04, 2014

Pierre MGI

Isnull (currentTask player) works but returns <null> taskDestination when triggered by succedded for example,
isnull taskdestination... leads to an error,
isnil "your_var for taskDestination" works for task completed