C

JSON: Nested Objects

See more JSON Examples

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

C

#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    const char *jsonStr;
    HCkJsonObject imageObj;
    HCkJsonObject thumbObj;

    success = FALSE;

    json = CkJsonObject_Create();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    jsonStr = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}";

    success = CkJsonObject_Load(json,jsonStr);
    if (success == FALSE) {
        printf("%s\n",CkJsonObject_lastErrorText(json));
        CkJsonObject_Dispose(json);
        return;
    }

    // Get the "image" object.
    imageObj = CkJsonObject_Create();
    CkJsonObject_ObjectOf2(json,"image",imageObj);

    printf("image: fname=%s, width=%d, height=%d\n",CkJsonObject_stringOf(imageObj,"fname"),CkJsonObject_IntOf(imageObj,"w"),CkJsonObject_IntOf(imageObj,"h"));

    // Get the "thumbnail" object.
    thumbObj = CkJsonObject_Create();
    CkJsonObject_ObjectOf2(json,"thumbnail",thumbObj);

    printf("thumbnail: fname=%s, width=%d, height=%d\n",CkJsonObject_stringOf(thumbObj,"fname"),CkJsonObject_IntOf(thumbObj,"w")
        ,CkJsonObject_IntOf(thumbObj,"h"));


    CkJsonObject_Dispose(json);
    CkJsonObject_Dispose(imageObj);
    CkJsonObject_Dispose(thumbObj);

    }