C

JavaScript console using Callbacks

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Demonstrates console output using Chilkat JavaScript with callbacks. C

#include <C_CkStringBuilder.h>
#include <C_CkJs.h>
#include <C_CkJsonObject.h>

void js_ProgressInfo(const char *name, const char *value)
    {
    printf("%s: %s\n",name,value);
    }

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sbScript;
    HCkJs js;
    void (*fnjsProgressInfo)(const char *name, const char *value) = js_ProgressInfo;
    HCkJsonObject result;

    success = FALSE;

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

    // Load the JavaScript from a file.
    sbScript = CkStringBuilder_Create();
    success = CkStringBuilder_LoadFile(sbScript,"qa_data/js_tests/test_console.js","utf-8");
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbScript));
        CkStringBuilder_Dispose(sbScript);
        return;
    }

    js = CkJs_Create();
    CkJs_setProgressInfo(js, fnjsProgressInfo);

    result = CkJsonObject_Create();

    // 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 = CkJs_Eval(js,sbScript,result);
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbScript));
        CkStringBuilder_Dispose(sbScript);
        CkJs_Dispose(js);
        CkJsonObject_Dispose(result);
        return;
    }

    // We can look at the result, which is "undefined", which is normal and expected.
    printf("%s\n",CkJsonObject_emit(result));
    // 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"}


    CkStringBuilder_Dispose(sbScript);
    CkJs_Dispose(js);
    CkJsonObject_Dispose(result);

    }