(MFC) JSON: Array of Objects

Here we have a JSON object that contains an array, where each element in the array is a JSON object. This example demonstrates how to access the objects contained within an array.

{ 
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter","lastName":"Jones"}
  ]
}

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 = "{\"employees\":[{\"firstName\":\"John\", \"lastName\":\"Doe\"},{\"firstName\":\"Anna\", \"lastName\":\"Smith\"},{\"firstName\":\"Peter\",\"lastName\":\"Jones\"}]}";

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

    // Get the "employees" array.
    CkJsonArray *employees = json.ArrayOf("employees");
    if (json.get_LastMethodSuccess() == false) {
        strOut.append("employees member not found.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Iterate over each employee, getting the JSON object at each index.
    int numEmployees = employees->get_Size();
    int i = 0;
    while (i < numEmployees) {

        CkJsonObject *empObj = employees->ObjectAt(i);

        strOut.append("employee[");
        strOut.appendInt(i);
        strOut.append("] = ");
        strOut.append(empObj->stringOf("firstName"));
        strOut.append(" ");
        strOut.append(empObj->stringOf("lastName"));
        strOut.append("\r\n");
        delete empObj;

        i = i + 1;
    }

    delete employees;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }