Exception handling: Difference between revisions

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[[Category:Armed Assault:Scripting]]
In {{arma1}} exception handling is an implemented system of special scripting commands ([[try]], [[catch]] and [[throw]]), which allows your scripts to create and to react to exceptions.


In Armed Assault is implemented system of [[Armde Assault:Scripting commands|scripting commands]] which allows your scripts react to lots of kinds of exceptions.
Standard construction is:
Standard construction is:
<sqf>
try
{
// code block that can throw exception
if (_name == "") then
{
throw "no name";
}
else
{
titleText [format ["Good morning, Captain %1.", _name], "PLAIN DOWN"];
sleep 1;
titleText [_name, "PLAIN DOWN"];
};
}
catch
{
// code block that processes an exception
if (_exception == "no name") then
{
hint "Name was not entered";
titleText ["And the name isn't", "PLAIN DOWN"];
};
};
</sqf>


try {
{{Feature|important|{{Name|arma}} scripting commands do '''not''' create SQF exceptions by themselves if they encounter an illegal situation, they throw a compilation exception (i.e. the here-described exception handling cannot be used for error trapping).
    //block, that can throw exception
    if (_name == "") then {
        throw "invalid _name"
    } else {
        TitleText ["And the name is:", "PLAIN DOWN"]
        ~1
        TitleText [_name, "PLAIN DOWN"]
}


catch {
The following would therefore '''not''' create a catchable exception:
    //block, that processes an exception
<sqf>
    if (_exception == "invalid _name") then {
try
        echo "Wrong name detected"
{
        TitleText ["And the name isn't", "PLAIN DOWN"]
a = 1 / 0; // SQF error happens here already
    }
}
}
catch
{
hint "illegal operation"; // useless
};
</sqf>
}}


{{AnswerMe}}
Probably is possible this too:
try {
    TitleText ["Sgt. Detritus: He have luck, but next time I'll kill him!", "PLAIN DOWN"]
    [jeepOne] exec "killDriver.sqs"
}


catch {
[[Category: Scripting Topics]]
    if (_exception == "car empty") then {
        TitleText ["Sgt. Detritus: He have luck, but next time I'll kill him!", "PLAIN DOWN"]
    } else {
        TitleText ["Sgt. Detritus: Some strange error appears...", "PLAIN DOWN"]
}

Latest revision as of 00:14, 22 July 2022

In Armed Assault exception handling is an implemented system of special scripting commands (try, catch and throw), which allows your scripts to create and to react to exceptions.

Standard construction is:

try { // code block that can throw exception if (_name == "") then { throw "no name"; } else { titleText [format ["Good morning, Captain %1.", _name], "PLAIN DOWN"]; sleep 1; titleText [_name, "PLAIN DOWN"]; }; } catch { // code block that processes an exception if (_exception == "no name") then { hint "Name was not entered"; titleText ["And the name isn't", "PLAIN DOWN"]; }; };

⚠
Arma scripting commands do not create SQF exceptions by themselves if they encounter an illegal situation, they throw a compilation exception (i.e. the here-described exception handling cannot be used for error trapping).

The following would therefore not create a catchable exception:

try { a = 1 / 0; // SQF error happens here already } catch { hint "illegal operation"; // useless };
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