C#

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. C#

bool success = false;

// This is the JavaScript we'll run:

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

Chilkat.StringBuilder sbScript = new Chilkat.StringBuilder();
sbScript.Append("console.log('Starting infinite loop...'); while(true) {};");

Chilkat.Js js = new 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.
js.TimeoutSeconds = 2;

Chilkat.JsonObject result = new Chilkat.JsonObject();
result.EmitCompact = false;

// Run the script..
success = js.Eval(sbScript,result);
if (success == false) {
    // Examine the result for an exception.
    Debug.WriteLine(result.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.
    Debug.WriteLine(js.LastErrorText);
    return;
}

// We should never get here..
Debug.WriteLine("Succeeded.");
Debug.WriteLine(result.Emit());