Lianja

Prevent JavaScript Infinite Loops

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Demonstrates how prevent infinite loops or prevent the JavaScript from running for a longer amount of time than allowed. Lianja

llSuccess = .F.

//  This is the JavaScript we'll run:

//  console.log('Starting infinite loop...'); while(true) {};

loSbScript = createobject("CkStringBuilder")
loSbScript.Append("console.log('Starting infinite loop...'); while(true) {};")

loJs = createobject("CkJs")

//  Set a limit on the amount of time (in seconds) the script is allowed to run.
//  If the JavaScript takes longer than this amount of time, then Chilkat kills the script without crashing the host program.
//  The default value of TimeoutSeconds is 0, which indicates no limit.
//  For this example, set a limit of 2 seconds.
loJs.TimeoutSeconds = 2

loResult = createobject("CkJsonObject")
loResult.EmitCompact = .F.

//  Run the script..
llSuccess = loJs.Eval(loSbScript,loResult)
if (llSuccess = .F.) then
    //  Examine the result for an exception.
    ? loResult.Emit()

    //  The result contains this:

    //  	{
    //  	  "exception": {
    //  	    "message": "interrupted - JavaScript exceeded the Chilkat.Js.TimeoutSeconds",
    //  	    "stack": [
    //  	      {
    //  	        "func": "<eval>",
    //  	        "file": "<input>",
    //  	        "line": 1,
    //  	        "col": 8
    //  	      }
    //  	    ]
    //  	  }
    //  	}

    //  Also examine the LastErrorText.
    ? loJs.LastErrorText
    release loSbScript
    release loJs
    release loResult
    return
endif

//  We should never get here..
? "Succeeded."
? loResult.Emit()


release loSbScript
release loJs
release loResult

JavaScript

console.log('Starting infinite loop...');
while(true) {};