try

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Description

Description:

Defines a try-catch structure. This sets up an exception handling block. Any thrown exception in a try block is caught in a catch block. The structured exception block has the following form:

try { /* block that can throw exception */ } catch { /* block that processes the exception. Exception is described in the _exception variable */ };

Groups:

Program Flow

Syntax

Syntax:

try code

Parameters:

code: Code

Return Value:

Exception Type

1.54

Alternative Syntax

Syntax:

args try code

Parameters:

args: Anything - passed arguments, will be put in _this variable inside the "code"

code: Code

Return Value:

Exception Type

Examples

Example 1:

try { throw "invalid argument" } catch { hint str _exception };

Example 2:

123 try { if (_this != 123) throw "invalid argument" } catch { hint str _exception };

Example 3:

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 handling throw catch

Notes

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Only post proven facts here! Add Note

Killzone_Kid - c

Posted on Jun 09, 2015 - 20:52 (UTC)

Do not expect this behave like Javascript try catch and ignore all errors. But it does have one useful behaviour. Normally when a runtime error occurs in SQF (unlike when there is compile error) it continues to execute till the end. But if the script is placed in try {} scope and throw is used upon error, the script immediately terminates, exits the try {} scope and enters catch {} scope. This way it is possible to process possible exceptions in civilised manner.