C

JSON: Nested Array

See more JSON Examples

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

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    const char *jsonStr;
    HCkJsonArray outerArray;
    int numArrays;
    int i;
    HCkJsonArray innerArray;
    int numInnerItems;
    int j;

    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 = "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }";

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

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    outerArray = CkJsonObject_ArrayOf(json,"numbers");
    if (CkJsonObject_getLastMethodSuccess(json) == FALSE) {
        printf("numbers array not found.\n");
        CkJsonObject_Dispose(json);
        return;
    }

    numArrays = CkJsonArray_getSize(outerArray);

    for (i = 0; i <= numArrays - 1; i++) {

        innerArray = CkJsonArray_ArrayAt(outerArray,i);

        // The first item in the innerArray is a string
        printf("%s:\n",CkJsonArray_stringAt(innerArray,0));

        numInnerItems = CkJsonArray_getSize(innerArray);

        for (j = 1; j <= numInnerItems - 1; j++) {

            printf("  %d\n",CkJsonArray_IntAt(innerArray,j));

        }

        CkJsonArray_Dispose(innerArray);
    }

    CkJsonArray_Dispose(outerArray);


    CkJsonObject_Dispose(json);

    }