Objective-C

JavaScript console using Callbacks

See more JavaScript Examples

Demonstrates console output using Chilkat JavaScript with callbacks. Objective-C

// This is the interface header jsProgress.h
#import "CkoBaseProgress.h"

@interface jsProgress : CkoBaseProgress {
}

- (void)ProgressInfo:(NSString *)pinfName value:(NSString *)pinfValue;
@end
// ----------------------------------------------------

#import <jsProgress.h>
@implementation jsProgress

- (void)ProgressInfo:(NSString *)pinfName value:(NSString *)pinfValue
{
        NSLog(@"%@%@%@",pinfName,@": ",pinfValue);
}

@end

// ----------------------------------------------------

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

BOOL success = NO;

//  This example demonstrates using the built-in console object.
//  The Javascript run in this example is shown below.

//  Load the JavaScript from a file.
CkoStringBuilder *sbScript = [[CkoStringBuilder alloc] init];
success = [sbScript LoadFile: @"qa_data/js_tests/test_console.js" charset: @"utf-8"];
if (success == NO) {
    NSLog(@"%@",sbScript.LastErrorText);
    return;
}

CkoJs *js = [[CkoJs alloc] init];
jsProgress *js_progress = [[jsProgress alloc] init];
[js setEventCallbackObject: js_progress];
CkoJsonObject *result = [[CkoJsonObject alloc] init];

//  Run the JavaScript
//  Results (not console output) go to result.
//  Note: Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
//  In this case, the last evaluated expression is console.log which does not calculate a value. Therefore, it returns undefined.
success = [js Eval: sbScript result: result];
if (success == NO) {
    NSLog(@"%@",sbScript.LastErrorText);
    return;
}

//  We can look at the result, which is "undefined", which is normal and expected.
NSLog(@"%@",[result Emit]);
//  The result JSON is: {"type":"undefined","value":"undefined"}

//  The console output is received using ProgressInfo callbacks.
//  The output is:

//  log: Hello World, 248, 12.05
//  
//  error: foo:bar baz
//  
//  warn: 1 2 3
//  
//  log: %% %s
//  
//  log: myApp: {
//    "appName": "Example",
//    "version": 1,
//    "isDebug": true,
//    "supportedTypes": [
//      "string",
//      "number",
//      "object"
//    ],
//    "settings": {
//      "maxWidgets": 1024,
//      "allowIO": true
//    }
//  }
//  
//  log: App: myApp (Version 1)
//  
//  {"type":"undefined","value":"undefined"}