publicVariable: Difference between revisions

Latest revision as of 15:57, 26 July 2023

1.34

1.00

Hover & click on the images for description

Description

Description:

Reliably broadcasts missionNamespace variable and its current value to all computers (server/client).
Variables broadcast with publicVariable during a mission will be available to JIP clients with the value they held at the time.
Such variables are persistent and sent to the JIP client before the first batch of client-side Event Scripts (such as init.sqf) is run.

⚠

Using publicVariable too frequently and/or with a lot of data can cause other aspects of the game to experience bandwidth problems.

The following Data Types are supported:

Type	Number	Boolean	Object	Group	String	Text	Array	Code	Nothing (nil)	HashMap
Since	1.34				1.00		1.09		1.26	2.02

⚠

It is not possible (and illogical) to transfer a local entity reference, such as scripts, displays or local objects.
Also, note that Team Member is not supported.

Groups:

Multiplayer Variables

Syntax

Syntax:: publicVariable varName
Parameters:: varName: String - the global variable's Identifier
Return Value:: Nothing

Examples

Example 1:: TAG_MyPublicVariable = 0; TAG_MyPublicVariable = 1; publicVariable "TAG_MyPublicVariable"; // other clients will receive the "TAG_MyPublicVariable" variable with a 1 value TAG_MyPublicVariable = 2; // needs to be broadcast again - synchronisation is not automatic
Example 2:: JIP example:
if (isNil "TAG_CurrentTarget") then // has the variable already been set and broadcast? { TAG_CurrentTarget = objNull; // if not, set it on the local machine }; player doTarget TAG_CurrentTarget;
Example 3:: TAG_BossName = "EvilBigBoss"; publicVariable TAG_BossName; // wrong - will try to publicVariable "EvilBigBoss" variable, that does not exist publicVariable "TAG_BossName"; // correct - important, do not forget the QUOTES

Additional Information

See also:: Multiplayer Scripting Initialisation Order addPublicVariableEventHandler publicVariableClient publicVariableServer Global Variable Event Scripts Join In Progress

Notes

: Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note

@@ Line 1: / Line 1: @@
-{{Command|= Comments
+{{RV|type=command
-____________________________________________________________________________________________
-| ofp |= Game name
+|game1= ofp
+|version1= 1.34
-|1.34|= Game version
+|game2= ofpe
+|version2= 1.00
-|arg= global |= Arguments in MP
+|game3= arma1
+|version3= 1.00
-|eff= global |= Effects in MP
+|game4= arma2
-____________________________________________________________________________________________
+|version4= 1.00
-| Broadcast variable value to all computers.
+|game5= arma2oa
+|version5= 1.50
-Only type [[Number]] is supported in version 1.33 and before.
+|game6= tkoh
+|version6= 1.00
-Following [[:Category:Types|Types]] are supported since version 1.34:
+|game7= arma3
-* [[Number]]
+|version7= 0.50
-* [[Boolean]]
-* [[Object]]
-* [[Group]]
-|= Description
-____________________________________________________________________________________________
-| '''publicVariable''' varName |= Syntax
+|gr1= Multiplayer
-|p1= varName: [[String]] |= Parameter 1
+|gr2= Variables
-| [[Nothing]] |= Return value
+|arg= local
-____________________________________________________________________________________________
-|x1= <code>'''publicVariable''' "CTFscoreOne" </code> |= Example 1
-____________________________________________________________________________________________
-|  |= See also
+|eff= global
-| mp= There is no guarantee that the broadcasted data arrives at all clients. Data is often lost due to congestion and other network problems. |=
+|descr= Reliably broadcasts [[missionNamespace]] variable and its '''current''' value to all computers (server/client).<br>
+Variables broadcast with [[publicVariable]] during a mission will be available to [[Multiplayer Scripting#Join In Progress|JIP]] clients with the value they held at the time.<br>
+Such variables are persistent and sent to the JIP client before the first batch of client-side [[Event Scripts]] (such as [[init.sqf]]) is run.
+{{Feature|important|Using [[publicVariable]] too frequently and/or with a lot of data can cause other aspects of the game to experience bandwidth problems.}}
+<br>
+The following [[:Category: Data Types| Data Types]] are supported:
+{{{!}} class="wikitable align-center"
+! Type
+{{!}} [[Number]]
+{{!}} [[Boolean]]
+{{!}} [[Object]]
+{{!}} [[Group]]
+{{!}} [[String]]
+{{!}} [[Structured Text|Text]]
+{{!}} [[Array]]
+{{!}} [[Code]]
+{{!}} [[Nothing]] ([[nil]])
+{{!}} [[HashMap]]
+{{!}}-
+! Since
+{{!}} colspan="4" {{!}} {{GVI|ofp|1.34}}
+{{!}} colspan="2" {{!}} {{GVI|arma1|1.00}}
+{{!}} colspan="2" {{!}} {{GVI|arma1|1.09}}
+{{!}} {{GVI|arma3|1.26}}
+{{!}} {{GVI|arma3|2.02}}
+{{!}}}
+{{Feature|important|
+It is not possible (and illogical) to transfer a local entity reference, such as [[Script Handle|scripts]], [[Display|displays]] or [[createVehicleLocal|local objects]].<br>
+Also, note that [[Team Member]] is not supported.
 }}
-<h3 style="display:none">Notes</h3>
+|s1= [[publicVariable]] varName
-<dl class="command_description">
-<!-- Note Section BEGIN -->
+|p1= varName: [[String]] - the [[Variables#Global Scope|global variable]]'s [[Identifier]]
-This command broadcasts a variable to all clients, but as soon as you change the variable again, you have to use '''publicVariable''' again, as it does not automatically synchronise it.
-<!-- Note Section END -->
+|r1= [[Nothing]]
-</dl>
-<h3 style="display:none">Bottom Section</h3>
+|x1= <sqf>
-[[Category:Scripting Commands|PUBLICVARIABLE]]
+TAG_MyPublicVariable = 0;
-[[Category:Scripting Commands OFP 1.96|PUBLICVARIABLE]]
+TAG_MyPublicVariable = 1;
-[[Category:Scripting Commands OFP 1.46|PUBLICVARIABLE]]
+publicVariable "TAG_MyPublicVariable";	// other clients will receive the "TAG_MyPublicVariable" variable with a 1 value
-[[Category:Scripting Commands ArmA|PUBLICVARIABLE]]
+TAG_MyPublicVariable = 2;				// needs to be broadcast again - synchronisation is not automatic
+</sqf>
+|x2= JIP example:
+<sqf>
+if (isNil "TAG_CurrentTarget") then	// has the variable already been set and broadcast?
+{
+	TAG_CurrentTarget = objNull;	// if not, set it on the local machine
+};
+player doTarget TAG_CurrentTarget;
+</sqf>
+|x3= <sqf>
+TAG_BossName = "EvilBigBoss";
+publicVariable TAG_BossName;	// wrong - will try to publicVariable "EvilBigBoss" variable, that does not exist
+publicVariable "TAG_BossName";	// correct - important, do not forget the QUOTES
+</sqf>
+|seealso= [[Multiplayer Scripting]] [[Initialisation Order]] [[addPublicVariableEventHandler]] [[publicVariableClient]] [[publicVariableServer]] [[Variables#Global Scope|Global Variable]] [[Event Scripts]] [[Multiplayer Scripting#Join In Progress|Join In Progress]]
+}}