Difference between revisions of "catch"

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{{Command|Comments=
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{{RV|type=command
____________________________________________________________________________________________
 
  
| arma |Game name=
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| arma1
  
|1.00|Game version=
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|gr1= Program Flow
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| Processes code when an [[Exception handling|exception]] is thrown in a [[try]] block. The exception caught can be found in the ''_exception'' variable. |DESCRIPTION=
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|1.00
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| try-block '''catch''' code |SYNTAX=
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| Processes code when an [[Exception handling|exception]] is thrown in a [[try]] block. The exception caught can be found in the ''_exception'' variable.
  
|p1= try-Block: [[Exception handling|Exception Type]] |PARAMETER1=
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| tryBlock [[catch]] code
  
|p2= code: [[Code]] |PARAMETER2=
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|p1= tryBlock: [[Exception handling|Exception Type]]
  
| [[Anything]] |RETURNVALUE=
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|p2= code: [[Code]]
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| [[Exception handling]], [[try]], [[throw]] |SEEALSO=
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| [[Anything]]
  
}}
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|x1= <code>[[try]] {[[throw]] "invalid argument"} [[catch]] {[[hint]] [[str]] _exception};</code>
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|x2= {{Since|arma3|1.53.133045}}: <code>123 [[try]] {[[if]] (_this != 123) [[throw]] "invalid argument"} [[catch]] {[[hint]] [[str]] _exception};</code>
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|x3= The correct usage of shorthand alt syntax: <code>[[try]] {
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[[if]] (a > b) [[throw]] "Error: some error"; {{cc|OK}}
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{{cc|The command argument is static}}
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} [[catch]] {
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[[hint]] [[str]] _exception;
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};
  
<h3 style="display:none">Notes</h3>
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[[try]] {
<dl class="command_description">
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_someFunc = {
<!-- Note Section BEGIN -->
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.....
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};
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[[if]] (a > b) [[throw]] ([[call]] _someFunc); {{cc|NOT OK}}
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{{cc|The command argument is dynamic}}
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{{cc|_someFunc is called first to get the value regardless of (a > b) outcome}}
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} [[catch]] {
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[[hint]] [[str]] _exception;
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};
  
<!-- Note Section END -->
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[[try]] {
</dl>
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_someFunc = {
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.....
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};
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[[if]] (a > b) [[then]] {[[throw]] ([[call]] _someFunc)}; /// OK
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{{cc|The command argument is dynamic}}
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{{cc|_someFunc is only called when (a > b) is [[true]]}}
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} [[catch]] {
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[[hint]] [[str]] _exception;
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};</code>
  
<h3 style="display:none">Bottom Section</h3>
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|seealso= [[Exception handling]], [[try]], [[throw]]
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}}
  
[[Category:Scripting Commands|CATCH]]
 
[[Category:Scripting Commands ArmA|CATCH]]
 
[[Category:Scripting Commands ArmA2|{{uc:{{PAGENAME}}}}]]
 
[[Category:Scripting Commands Arma 3|{{uc:{{PAGENAME}}}}]]
 
[[Category:Scripting_Commands_Take_On_Helicopters|{{uc:{{PAGENAME}}}}]]
 
  
[[Category:Command Group: Program Flow|CATCH]]
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[[Category:Scripting Commands|{{uc:{{PAGENAME}}}}]]
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{{GameCategory|arma1|Scripting Commands}}
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{{GameCategory|arma2|Scripting Commands}}
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{{GameCategory|arma3|Scripting Commands}}
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{{GameCategory|tkoh|Scripting Commands}}

Latest revision as of 23:22, 16 February 2021

Hover & click on the images for descriptions

Description

Description:
Processes code when an exception is thrown in a try block. The exception caught can be found in the _exception variable.

Syntax

Syntax:
tryBlock catch code
Parameters:
tryBlock: Exception Type
code: Code
Return Value:
Anything

Examples

Example 1:
try {throw "invalid argument"} catch {hint str _exception};
Example 2:
since Arma 3 v1.53.133045: 123 try {if (_this != 123) throw "invalid argument"} catch {hint str _exception};
Example 3:
The correct usage of shorthand alt syntax: try { if (a > b) throw "Error: some error"; // OK // The command argument is static } catch { hint str _exception; }; try { _someFunc = { ..... }; if (a > b) throw (call _someFunc); // NOT OK // The command argument is dynamic // _someFunc is called first to get the value regardless of (a > b) outcome } catch { hint str _exception; }; try { _someFunc = { ..... }; if (a > b) then {throw (call _someFunc)}; /// OK // The command argument is dynamic // _someFunc is only called when (a > b) is true } catch { hint str _exception; };

Additional Information

See also:
Exception handlingtrythrow
Groups:
Program Flow

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