Xbase++ Requires Chilkat v11.4.0+

Prevent JavaScript Infinite Loops

See more JavaScript Examples

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

LOCAL nSuccess
LOCAL oSbScript
LOCAL oJs
LOCAL oResult

nSuccess := 0

//  This is the JavaScript we'll run:

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

oSbScript := CreateObject("Chilkat.StringBuilder")
oSbScript:Append("console.log('Starting infinite loop...'); while(true) {};")

oJs := CreateObject("Chilkat.Js")

//  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.
oJs:TimeoutSeconds := 2

oResult := CreateObject("Chilkat.JsonObject")
oResult:EmitCompact := 0

//  Run the script..
nSuccess := oJs:Eval(oSbScript, oResult)
IF (nSuccess == 0)
    //  Examine the result for an exception.
    ? oResult: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.
    ? oJs:LastErrorText
    oSbScript:destroy()
    oJs:destroy()
    oResult:destroy()
    RETURN
ENDIF

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

oSbScript:destroy()
oJs:destroy()
oResult:destroy()

JavaScript

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