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(Unicode C) Firebase GET - Reading DataDemonstrates how to read parts of a Firebase JSON database. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:
#include <C_CkFileAccessW.h> #include <C_CkRestW.h> #include <C_CkAuthGoogleW.h> #include <C_CkStringBuilderW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { BOOL success; HCkFileAccessW fac; const wchar_t *accessToken; HCkRestW rest; HCkAuthGoogleW authGoogle; const wchar_t *jsonResponse; HCkStringBuilderW piggyPath; HCkJsonObjectW shallow; HCkJsonObjectW piggyData; int count; int i; const wchar_t *piggyJson; // Demonstrates how to read parts of a Firebase JSON database. // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example assumes a JWT authentication token, if required, has been previously obtained. // See Get Firebase Access Token from JSON Service Account Private Key for sample code. // Load the previously obtained Firebase access token into a string. fac = CkFileAccessW_Create(); accessToken = CkFileAccessW_readEntireTextFile(fac,L"qa_data/tokens/firebaseToken.txt",L"utf-8"); if (CkFileAccessW_getLastMethodSuccess(fac) != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac)); CkFileAccessW_Dispose(fac); return; } rest = CkRestW_Create(); // Make the initial connection (without sending a request yet). // Once connected, any number of requests may be sent. It is not necessary to explicitly // call Connect before each request. success = CkRestW_Connect(rest,L"chilkat.firebaseio.com",443,TRUE,TRUE); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkFileAccessW_Dispose(fac); CkRestW_Dispose(rest); return; } // If authentication is required... authGoogle = CkAuthGoogleW_Create(); CkAuthGoogleW_putAccessToken(authGoogle,accessToken); CkRestW_SetAuthGoogle(rest,authGoogle); // Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json // Let's get the animals with the shallow parameter so we can see how many pigs exist. jsonResponse = CkRestW_fullRequestNoBody(rest,L"GET",L"/pig-rescue/animal.json?shallow=true"); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkFileAccessW_Dispose(fac); CkRestW_Dispose(rest); CkAuthGoogleW_Dispose(authGoogle); return; } // The JSON returned should look like this: // {"-KI3bD-FU_Dake7sYOiP":true,"-KI3bD-FU_Dake7sYOiT":true,"-KI3bD-FU_Dake7sYOiS":true,"-KI3bD-FU_Dake7sYOiU":true,"-KI3bD-FU_Dake7sYOiV":true,"-KI3bD-FU_Dake7sYOiR":true,"-KI3bD-FU_Dake7sYOiQ":true} wprintf(L"%s\n",jsonResponse); // Parse the response so we can iterate over each pig in the database.. piggyPath = CkStringBuilderW_Create(); shallow = CkJsonObjectW_Create(); piggyData = CkJsonObjectW_Create(); CkJsonObjectW_Load(shallow,jsonResponse); count = CkJsonObjectW_getSize(shallow); i = 0; while (i < count) { // Get each individual pig's data. CkStringBuilderW_Clear(piggyPath); CkStringBuilderW_Append(piggyPath,L"/pig-rescue/animal/"); CkStringBuilderW_Append(piggyPath,CkJsonObjectW_nameAt(shallow,i)); CkStringBuilderW_Append(piggyPath,L"/.json"); piggyJson = CkRestW_fullRequestNoBody(rest,L"GET",CkStringBuilderW_getAsString(piggyPath)); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkFileAccessW_Dispose(fac); CkRestW_Dispose(rest); CkAuthGoogleW_Dispose(authGoogle); CkStringBuilderW_Dispose(piggyPath); CkJsonObjectW_Dispose(shallow); CkJsonObjectW_Dispose(piggyData); return; } // Show this piggy's data... // An example of one pig's data is shown here: // {"birth":"February, 1998","from":"Middle Ave.","gender":"F","in-date":"January, 2000", // "name":"Molly II","picture":{"caption":"Molly in the Pasture","description":"Black pig","file":"molly_th.jpg"}, // "species":"pot belly pig","type":"Cathy's Herd"} wprintf(L"---- %d ----\n",i); wprintf(L"%s\n",piggyJson); // Let's get the pig's name, and the caption of the picture. CkJsonObjectW_Load(piggyData,piggyJson); wprintf(L"name: %s\n",CkJsonObjectW_stringOf(piggyData,L"name")); wprintf(L"caption: %s\n",CkJsonObjectW_stringOf(piggyData,L"picture.caption")); i = i + 1; } // Note: In many of the Chilkat examples, you may notice strange ways // of doing something that should be simpler and shorter. For example, // building the piggyPath (above) could've been written differently, // with some simple string concatenation. // // The reason is that the Chilkat examples are written in a // proprietary "example code" scripting language, // and then automatically generated to each of the different programming // languages you see on example-code.com. The code generation is // limited in what it can do. For example, string concatentation // is not yet a feature of the "example code" scripting language (as of May 2016), // and therefore you won't see the use of a programming language's string // concatentation operators in any example. // CkFileAccessW_Dispose(fac); CkRestW_Dispose(rest); CkAuthGoogleW_Dispose(authGoogle); CkStringBuilderW_Dispose(piggyPath); CkJsonObjectW_Dispose(shallow); CkJsonObjectW_Dispose(piggyData); } |
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