Chilkat Examples

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Unicode C++ Examples

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(Unicode C++) JSON: Nested Array

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] 
  ] }

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#include <CkJsonObjectW.h>
#include <CkJsonArrayW.h>

void ChilkatSample(void)
    {
    CkJsonObjectW json;

    // 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. 
    const wchar_t *jsonStr = L"{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }";

    bool success = json.Load(jsonStr);
    if (success != true) {
        wprintf(L"%s\n",json.lastErrorText());
        return;
    }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    CkJsonArrayW *outerArray = json.ArrayOf(L"numbers");
    if (json.get_LastMethodSuccess() == false) {
        wprintf(L"numbers array not found.\n");
        return;
    }

    int numArrays = outerArray->get_Size();
    int i;

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

        CkJsonArrayW *innerArray = outerArray->ArrayAt(i);

        // The first item in the innerArray is a string
        wprintf(L"%s:\n",innerArray->stringAt(0));

        int numInnerItems = innerArray->get_Size();
        int j;
        for (j = 1; j <= numInnerItems - 1; j++) {

            wprintf(L"  %d\n",innerArray->IntAt(j));

        }

        delete innerArray;
    }

    delete outerArray;
    }

 

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