(Objective-C) Enable Chilkat Classes in JavaScript

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Note: This example requires Chilkat v11.4.0 or greater.

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#import <CkoStringBuilder.h>
#import <CkoJs.h>
#import <CkoJsonObject.h>

BOOL success = NO;

// Chilkat classes within JavaScript are disabled by default.
// An attempt to instantiate a disabled Chilkat class results in a JavaScript exception.

// For example, try the following JavaScript without first enabling the Chilkat class:

// sb = new CkStringBuilder();
// sb.Append('Hello World');
// success = sb.WriteFile('c:/aaworkarea/helloWorld.txt','utf-8',true);

CkoStringBuilder *sbJavaScript = [[CkoStringBuilder alloc] init];
[sbJavaScript Append: @"sb = new CkStringBuilder(); sb.Append('Hello World'); success = sb.WriteFile('c:/aaworkarea/helloWorld.txt','utf-8',true);"];

CkoJs *js = [[CkoJs alloc] init];

CkoJsonObject *result = [[CkoJsonObject alloc] init];
result.EmitCompact = NO;

// Run the script.  This should result in an error because we haven't enabled the Chilkat CkStringBuilder class.
success = [js Eval: sbJavaScript result: result];
if (success == NO) {
    // Examine the result for an exception.
    NSLog(@"%@",[result Emit]);

    // The result contains this:
    // {
    //   "exception": {
    //     "message": "Cannot create the chilkat object because the chilkat class is disabled in JavaScript. Fix by calling SetCkPermission before calling Eval or CallFunction",
    //     "stack": [
    //       {
    //         "func": "CkStringBuilder"
    //       },
    //       {
    //         "func": "<eval>",
    //         "file": "<input>",
    //         "line": 1,
    //         "col": 9
    //       }
    //     ]
    //   }
    // }

}

// Enable the Chilkat CkStringBuilder JavaScript class for readWrite
[js SetCkPermission: @"CkStringBuilder" permission: @"readWrite"];
// The script should work now...
success = [js Eval: sbJavaScript result: result];
NSLog(@"%@%d",@"success = ",success);

// If the CkStringBuilder class is enabled for readOnly or sandbox, then it will fail.
//   - Chilkat methods that could directly or indirectly write to the filesystem require writeOnly or readWrite access.
//   - Chilkat methods that read the local filesystem require readOnly or readWrite access.
//   - Chilkat methods that don't interact with the local filesystem work in any mode including sandbox.
[js SetCkPermission: @"CkStringBuilder" permission: @"readOnly"];
success = [js Eval: sbJavaScript result: result];
if (success == NO) {
    // Examine the result for an exception.
    NSLog(@"%@",[result Emit]);

    // {
    //   "exception": {
    //     "message": "failed because this Chilkat method requires the writeOnly or readWrite permission",
    //     "stack": [
    //       {
    //         "func": "WriteFile"
    //       },
    //       {
    //         "func": "<eval>",
    //         "file": "<input>",
    //         "line": 1,
    //         "col": 67
    //       }
    //     ]
    //   }
    // }
}