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(Unicode C) Demonstrates how to Handle Large Integers in JSONSee more JSON ExamplesDemonstrates how to handle large integers in JSON. (Integers larger than what can fit in a 32-bit signed integer.)
#include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkJsonObjectW json; BOOL success; int id; const wchar_t *accountId; // Let's say your JSON has this: // { // "id": 20000000001234567 // } json = CkJsonObjectW_Create(); success = CkJsonObjectW_LoadFile(json,L"qa_data/json/large_int.json"); if (success == FALSE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // The integer is too large for a 32-bit signed integer that is returned by IntOf. // The result will be something that wrapped around and could be negative. // In this case it would be: -543893881 id = CkJsonObjectW_IntOf(json,L"id"); wprintf(L"id: %d\n",id); // The solution is to read the integer value as a string, and then use the features in your programming language // to convert from a string to a 64-bit integer. // // Alternatively, you may wish to simply hold the value as a string. If, for example, the integer simply references // an order ID, an account ID, etc., then there's no need to convert to an integer value. You're not going to be doing // mathematical operations on it anyway. This is usually the case for large integers -- they typically exist // in JSON as an account ID. // You can get any JSON value as a string: accountId = CkJsonObjectW_stringOf(json,L"id"); wprintf(L"accountId: %s\n",accountId); // Sample output: // id: -543893881 // accountId: 20000000001234567 CkJsonObjectW_Dispose(json); } |
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