catch: Difference between revisions

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m (Text replacement - "\[\[Category:ArmA: Control Structures\|[a-zA-Z0-9 _]*\]\]" to "")
(Add example)
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| try-block '''catch''' code |SYNTAX=
| tryBlock [[catch]] code |SYNTAX=


|p1= try-Block: [[Exception handling|Exception Type]] |PARAMETER1=
|p1= tryBlock: [[Exception handling|Exception Type]] |PARAMETER1=


|p2= code: [[Code]] |PARAMETER2=
|p2= code: [[Code]] |PARAMETER2=
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| [[Anything]] |RETURNVALUE=
| [[Anything]] |RETURNVALUE=
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|x1= <code>[[try]] {[[throw]] "invalid argument"} [[catch]] {[[hint]] [[str]] _exception};</code> |EXAMPLE1=
|x2= {{since|arma3|1.53.133045}}: <code>123 [[try]] {[[if]] (_this != 123) [[throw]] "invalid argument"} [[catch]] {[[hint]] [[str]] _exception};</code> |EXAMPLE2=
|x3= The correct usage of shorthand alt syntax: <code>[[try]] {
[[if]] (a > b) [[throw]] "Error: some error"; {{cc|OK}}
{{cc|The command argument is static}}
} [[catch]] {
[[hint]] [[str]] _exception;
};
[[try]] {
_someFunc = {
.....
};
[[if]] (a > b) [[throw]] ([[call]] _someFunc); {{cc|NOT OK}}
{{cc|The command argument is dynamic}}
{{cc|_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
{{cc|The command argument is dynamic}}
{{cc|_someFunc is only called when (a > b) is [[true]]}}
} [[catch]] {
[[hint]] [[str]] _exception;
};</code> |EXAMPLE3=


| [[Exception handling]], [[try]], [[throw]] |SEEALSO=  
| [[Exception handling]], [[try]], [[throw]] |SEEALSO=  
}}
}}


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<h3 style="display:none">Bottom Section</h3>
<h3 style="display:none">Bottom Section</h3>


[[Category:Scripting Commands|CATCH]]
[[Category:Scripting Commands|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands ArmA|CATCH]]
[[Category:Scripting Commands ArmA|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands ArmA2|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands ArmA2|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands Arma 3|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands Arma 3|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting_Commands_Take_On_Helicopters|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting_Commands_Take_On_Helicopters|{{uc:{{PAGENAME}}}}]]
 
[[Category:Command Group: Program Flow|{{uc:{{PAGENAME}}}}]]
[[Category:Command Group: Program Flow|CATCH]]

Revision as of 20:40, 5 January 2020

-wrong parameter ("Arma") defined!-1.00
Hover & click on the images for description

Description

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

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:
Template:since: 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

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

Notes

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