Unicode C

Get the Root of a JSON Document

See more JSON Examples

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

Unicode C

#include <C_CkJsonObjectW.h>
#include <C_CkJsonArrayW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObjectW json;
    const wchar_t *jsonStr;
    HCkJsonObjectW abcObj;
    HCkJsonArrayW xArray;
    HCkJsonObjectW bObj;
    HCkJsonObjectW docRoot;

    success = FALSE;

    json = CkJsonObjectW_Create();

    jsonStr = L"{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}";

    success = CkJsonObjectW_Load(json,jsonStr);
    if (success == FALSE) {
        wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json));
        CkJsonObjectW_Dispose(json);
        return;
    }

    // Get the "abc" object.
    abcObj = CkJsonObjectW_Create();
    success = CkJsonObjectW_ObjectOf2(json,L"abc",abcObj);
    if (success == FALSE) {
        wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json));
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(abcObj);
        return;
    }

    // Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
    CkJsonObjectW_putEmitCompact(abcObj,FALSE);
    wprintf(L"%s\n",CkJsonObjectW_emit(abcObj));

    // Navigate to the "x" array
    xArray = CkJsonArrayW_Create();
    CkJsonObjectW_ArrayOf2(abcObj,L"x",xArray);

    // Navigate to the 2nd object contained within the array.  This contains members b1 and b2
    bObj = CkJsonObjectW_Create();
    CkJsonArrayW_ObjectAt2(xArray,1,bObj);

    // Show that we're at "b1/b2".
    // The value of "b1" should be "200"
    wprintf(L"b2 = %d\n",CkJsonObjectW_IntOf(bObj,L"b2"));

    // Now go back to the JSON doc root:
    docRoot = CkJsonObjectW_Create();
    CkJsonObjectW_GetDocRoot2(bObj,docRoot);

    // We'll skip the null check and assume it's non-null...

    // Pretty-print the JSON doc from the root to show that this is indeed the root.
    CkJsonObjectW_putEmitCompact(docRoot,FALSE);
    wprintf(L"%s\n",CkJsonObjectW_emit(docRoot));


    CkJsonObjectW_Dispose(json);
    CkJsonObjectW_Dispose(abcObj);
    CkJsonArrayW_Dispose(xArray);
    CkJsonObjectW_Dispose(bObj);
    CkJsonObjectW_Dispose(docRoot);

    }