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(Unicode C) JSON PathsDemonstrates using "Chilkat JSON Paths" to access parts of a JSON document, or to iterate over parts. This example uses the following JSON document: { "nestedArray" : [ [ [1,2,3], [4,5,6], [7,8,9,10] ], [ [11,12,13], [14,15,16], [17,18,19,20] ], [ [21,22,23], [24,25,26], [27,28,29,30], [31,32,33,34,35,36] ] ], "nestedObject" : { "aaa" : { "bb1" : { "cc1" : "c1Value", "cc2" : "c2Value", "cc3" : "c3Value" }, "bb2" : { "dd1" : "d1Value", "dd2" : "d2Value", "dd3" : "d3Value" } } }, "mixture" : { "arrayA" : [ { "fruit": "apple", "animal": "horse", "job": "fireman", "colors": ["red","blue","green"] }, { "fruit": "pear", "animal": "plankton", "job": "waiter", "colors": ["yellow","orange","purple"] }, { "fruit": "kiwi", "animal": "echidna", "job": "astronaut", "colors": ["magenta","tan","pink"] } ] }, "name.with.dots" : { "grain" : "oats" } }
#include <C_CkJsonObjectW.h> #include <C_CkJsonArrayW.h> void ChilkatSample(void) { HCkJsonObjectW json; BOOL success; int sz; int i; int j; int k; int szI; int szJ; int szK; HCkJsonObjectW obj2; HCkJsonArrayW arr1; int szArr1; json = CkJsonObjectW_Create(); CkJsonObjectW_putEmitCompact(json,FALSE); // Assume the file contains the data as shown above.. success = CkJsonObjectW_LoadFile(json,L"qa_data/json/pathSample.json"); if (success != TRUE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // First, let's get the value of "cc1" // The path to this value is: nestedObject.aaa.bb1.cc1 wprintf(L"%s\n",CkJsonObjectW_stringOf(json,L"nestedObject.aaa.bb1.cc1")); // Now let's get number 18 from the nestedArray. // It is located at nestedArray[1][2][1] // (remember: Indexing is 0-based) wprintf(L"This should be 18: %d\n",CkJsonObjectW_IntOf(json,L"nestedArray[1][2][1]")); // We can do the same thing in a more roundabout way using the // I, J, and K properties. (The I,J,K properties will be convenient // for iterating over arrays, as we'll see later.) CkJsonObjectW_putI(json,1); CkJsonObjectW_putJ(json,2); CkJsonObjectW_putK(json,1); wprintf(L"This should be 18: %d\n",CkJsonObjectW_IntOf(json,L"nestedArray[i][j][k]")); // Let's iterate over the array containing the numbers 17, 18, 19, 20. // First, use the SizeOfArray method to get the array size: sz = CkJsonObjectW_SizeOfArray(json,L"nestedArray[1][2]"); // The size should be 4. wprintf(L"size of array = %d (should equal 4)\n",sz); // Now iterate... for (i = 0; i <= sz - 1; i++) { CkJsonObjectW_putI(json,i); wprintf(L"%d\n",CkJsonObjectW_IntOf(json,L"nestedArray[1][2][i]")); } // Let's use a triple-nested loop to iterate over the nestedArray: // szI should equal 1. szI = CkJsonObjectW_SizeOfArray(json,L"nestedArray"); for (i = 0; i <= szI - 1; i++) { CkJsonObjectW_putI(json,i); szJ = CkJsonObjectW_SizeOfArray(json,L"nestedArray[i]"); for (j = 0; j <= szJ - 1; j++) { CkJsonObjectW_putJ(json,j); szK = CkJsonObjectW_SizeOfArray(json,L"nestedArray[i][j]"); for (k = 0; k <= szK - 1; k++) { CkJsonObjectW_putK(json,k); wprintf(L"%d\n",CkJsonObjectW_IntOf(json,L"nestedArray[i][j][k]")); } } } // Now let's examine how to navigate to JSON objects contained within JSON arrays. // This line of code gets the value "kiwi" contained within "mixture" wprintf(L"%s\n",CkJsonObjectW_stringOf(json,L"mixture.arrayA[2].fruit")); // This line of code gets the color "yellow" wprintf(L"%s\n",CkJsonObjectW_stringOf(json,L"mixture.arrayA[1].colors[0]")); // Getting an object at a path: // This gets the 2nd object in "arrayA" obj2 = CkJsonObjectW_ObjectOf(json,L"mixture.arrayA[1]"); // This object's "animal" should be "plankton" wprintf(L"%s\n",CkJsonObjectW_stringOf(obj2,L"animal")); // Note that paths are relative to the object, not the absolute root of the JSON document. // Starting from obj2, "purple" is at "colors[2]" wprintf(L"%s\n",CkJsonObjectW_stringOf(obj2,L"colors[2]")); CkJsonObjectW_Dispose(obj2); // Getting an array at a path: // This gets the array containing the colors red, green, blue: arr1 = CkJsonObjectW_ArrayOf(json,L"mixture.arrayA[0].colors"); szArr1 = CkJsonArrayW_getSize(arr1); for (i = 0; i <= szArr1 - 1; i++) { wprintf(L"%d: %s\n",i,CkJsonArrayW_stringAt(arr1,i)); } CkJsonArrayW_Dispose(arr1); // The Chilkat JSON path uses ".", "[", and "]" chars for separators. When a name // contains one of these chars, use double-quotes in the path: wprintf(L"%s\n",CkJsonObjectW_stringOf(json,L"\"name.with.dots\".grain")); CkJsonObjectW_Dispose(json); } |
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