publicVariable: Difference between revisions

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{{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]]
Following [[:Category:Types|Types]] are supported since version [[ArmA]] v1.00:
* [[String]]
Since version [[ArmA]] v1.09:
Any value can be transferred, including
* [[Array]]
* [[Code]]
The only limitation is you cannot transfer references to entities which are local, like [[Script|scripts]], [[Display|displays]], or local objects.


|= Description
|gr1= Multiplayer
____________________________________________________________________________________________


| '''publicVariable''' varName |= Syntax
|gr2= Variables


|p1= varName: [[String]] |= Parameter 1
|arg= local


| [[Nothing]] |= Return value
|eff= global
____________________________________________________________________________________________
 
|x1= <code>'''publicVariable''' "CTFscoreOne" </code> |= Example 1
____________________________________________________________________________________________


| [[addPublicVariableEventHandler]] |= See also
|descr= Reliably broadcasts [[missionNamespace]] variable and its '''current''' value to all computers (server/client).<br>
| mp= The message is sent reliably to all clients. Using publicVariable a lot can cause other parts of the game to experience bandwidth problems.|=
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]]
<dd class="notedate">Posted 2007</dd>
 
<dd class="note">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.
|r1= [[Nothing]]
</dd>
 
<dd class="notedate">Posted on 2 Feb, 2008</dd>
|x1= <sqf>
<dt class="note">[[User:Dr_Eyeball|Dr_Eyeball]]</dt><dd class="note">
TAG_MyPublicVariable = 0;
When initialising a public variable to handle '''JIP''', you will usually first want to check if the public variable has already been (broadcast, received and) set locally. Otherwise you may inadvertantly overwrite the broadcast value with your default value.<br>
TAG_MyPublicVariable = 1;
<br>
publicVariable "TAG_MyPublicVariable"; // other clients will receive the "TAG_MyPublicVariable" variable with a 1 value
To perform this check, use code similar to the following to first check that the variable is nil:
 
if ([[isNil]] "PV_abc") then
TAG_MyPublicVariable = 2; // needs to be broadcast again - synchronisation is not automatic
{
</sqf>
  // set the nil variable with a default value for server and both JIP & 'join at mission start'
 
  PV_abc = [7, 8, 9];
|x2= JIP example:
};  
<sqf>
// else public variable has already been set due to a public variable broadcast.
if (isNil "TAG_CurrentTarget") then // has the variable already been set and broadcast?
<br>
{
</dd>
TAG_CurrentTarget = objNull; // if not, set it on the local machine
<dd class="notedate">Posted on 12 April, 2008</dd>
};
<dt class="note">[[User:Icemotoboy|Icemotoboy]]</dt><dd class="note">
 
Be sure to place your variable name in quotation marks.  This may sound awfully simple, but many times I have forgotten to do this, and it has resulted in no end of headaches for me.
player doTarget TAG_CurrentTarget;
</dd>
</sqf>
<dd class="notedate">Posted on 13 April, 2008</dd>
 
<dt class="note">[[User:corsair|=FSI=Corsair]]</dt><dd class="note">
|x3= <sqf>
Var type "side" cannot be sent on 1.08, it will work in 1.11, 1.09 not tested
TAG_BossName = "EvilBigBoss";
</dd>
 
<!-- Note Section END -->
publicVariable TAG_BossName; // wrong - will try to publicVariable "EvilBigBoss" variable, that does not exist
</dl>
publicVariable "TAG_BossName"; // correct - important, do not forget the QUOTES
</sqf>


<h3 style="display:none">Bottom Section</h3>
|seealso= [[Multiplayer Scripting]] [[Initialisation Order]] [[addPublicVariableEventHandler]] [[publicVariableClient]] [[publicVariableServer]] [[Variables#Global Scope|Global Variable]] [[Event Scripts]] [[Multiplayer Scripting#Join In Progress|Join In Progress]]
[[Category:Scripting Commands|PUBLICVARIABLE]]
}}
[[Category:Scripting Commands OFP 1.96|PUBLICVARIABLE]]
[[Category:Scripting Commands OFP 1.46|PUBLICVARIABLE]]
[[Category:Scripting Commands ArmA|PUBLICVARIABLE]]
[[Category:Command_Group:_Multiplayer|{{uc:{{PAGENAME}}}}]]

Latest revision as of 15:57, 26 July 2023

Logo A0.png1.34ofpe logo.png1.00Logo A1 black.png1.00Logo A2.png1.00A2 OA Logo.png1.50tkoh logo small.png1.00Arma 3 logo black.png0.50
LALocalGEGlobal
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 Logo A0.png1.34 Logo A1 black.png1.00 Logo A1 black.png1.09 Arma 3 logo black.png1.26 Arma 3 logo black.png2.02
⚠
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:
MultiplayerVariables

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
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