C

Loading and Parsing a JSON Array

See more JSON Examples

A JSON array is JSON that begins with "[" and ends with "]". For example, this is a JSON array that contains 3 JSON objects.

[{"name":"jack"},{"name":"john"},{"name":"joe"}]

A JSON object, however, is JSON that begins with "{" and ends with "}". For example, this JSON is an object that contains an array.

{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}

This example shows how loading a JSON array is different than loading a JSON object. C

#include <C_CkJsonArray.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    const char *strJsonArray;
    const char *strJsonObject;
    HCkJsonArray jsonArray;
    int i;
    HCkJsonObject jsonObj;
    HCkJsonObject jsonObject;
    int numPets;

    strJsonArray = "[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]";

    strJsonObject = "{\"pets\":[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]}";

    // A JSON array must be loaded using JsonArray:
    jsonArray = CkJsonArray_Create();
    CkJsonArray_Load(jsonArray,strJsonArray);

    // Examine the values:
    i = 0;
    while (i < CkJsonArray_getSize(jsonArray)) {
        jsonObj = CkJsonArray_ObjectAt(jsonArray,i);
        printf("%d: %s\n",i,CkJsonObject_stringOf(jsonObj,"name"));
        CkJsonObject_Dispose(jsonObj);
        i = i + 1;
    }

    // Output is:

    // 	0: jack
    // 	1: john
    // 	2: joe

    // A JSON object must be loaded using JsonObject
    jsonObject = CkJsonObject_Create();
    CkJsonObject_Load(jsonObject,strJsonObject);

    // Examine the values:
    i = 0;
    numPets = CkJsonObject_SizeOfArray(jsonObject,"pets");
    while (i < numPets) {
        CkJsonObject_putI(jsonObject,i);
        printf("%d: %s\n",i,CkJsonObject_stringOf(jsonObject,"pets[i].name"));
        i = i + 1;
    }

    // Output is:

    // 	0: jack
    // 	1: john
    // 	2: joe


    CkJsonArray_Dispose(jsonArray);
    CkJsonObject_Dispose(jsonObject);

    }