(MFC) 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] 
  ] }

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkJsonArray.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    bool success = json.Load(jsonStr);
    if (success != true) {
        strOut.append(json.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    CkJsonArray *outerArray = json.ArrayOf("numbers");
    if (json.get_LastMethodSuccess() == false) {
        strOut.append("numbers array not found.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

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

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

        // The first item in the innerArray is a string
        strOut.append(innerArray->stringAt(0));
        strOut.append(":");
        strOut.append("\r\n");

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

            strOut.append("  ");
            strOut.appendInt(innerArray->IntAt(j));
            strOut.append("\r\n");

        }

        delete innerArray;
    }

    delete outerArray;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }