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(Unicode C) Get the Index of a JSON MemberThis example demonstrates how to get the index of a given member by name. { "name": "donut", "image": { "fname": "donut.jpg", "w": 200, "h": 200 }, "thumbnail": { "fname": "donutThumb.jpg", "w": 32, "h": 32 } }
#include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkJsonObjectW json; const wchar_t *jsonStr; BOOL success; int nameIndex; int thumbIndex; int fnameIndex; HCkJsonObjectW imageObj; json = CkJsonObjectW_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 = L"{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}"; success = CkJsonObjectW_Load(json,jsonStr); if (success != TRUE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // The top-level JSON object has three members: name, image, and thumbnail. nameIndex = CkJsonObjectW_IndexOf(json,L"name"); // The index of the "name" member is 0. wprintf(L"nameIndex = %d\n",nameIndex); thumbIndex = CkJsonObjectW_IndexOf(json,L"thumbnail"); // The index of the "thumbnail" member is 2. wprintf(L"thumbIndex = %d\n",thumbIndex); // The "fname" member is NOT a direct member of the top-level JSON object. // It is a member of a nested object. If we try to get the index of this // member using the top-level JSON object, it is not found (and returns -1). fnameIndex = CkJsonObjectW_IndexOf(json,L"fname"); // The fnameIndex is -1 (not found). This is correct. wprintf(L"fnameIndex = %d\n",fnameIndex); // Get the "image" object. imageObj = CkJsonObjectW_ObjectOf(json,L"image"); if (CkJsonObjectW_getLastMethodSuccess(json) == FALSE) { wprintf(L"image object not found.\n"); CkJsonObjectW_Dispose(json); return; } // Now we can get the index of the "fname" object, because it is a direct // member of the "image" object: fnameIndex = CkJsonObjectW_IndexOf(imageObj,L"fname"); wprintf(L"fnameIndex = %d\n",fnameIndex); CkJsonObjectW_Dispose(imageObj); CkJsonObjectW_Dispose(json); } |
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