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325 lines
9.3 KiB
325 lines
9.3 KiB
/**************************************************************************** |
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* apps/examples/json/json_main.c |
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* |
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* This file is a part of NuttX: |
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* |
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* Copyright (C) 2012 Gregory Nutt. All rights reserved. |
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* Ported by: Darcy Gong |
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* |
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* And derives from the cJSON Project which has an MIT license: |
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* |
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* Copyright (c) 2009 Dave Gamble |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <apps/netutils/cJSON.h> |
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/**************************************************************************** |
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* Private Types |
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****************************************************************************/ |
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/* Used by some code below as an example datatype. */ |
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struct record |
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{ |
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const char *precision; |
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double lat; |
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double lon; |
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const char *address; |
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const char *city; |
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const char *state; |
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const char *zip; |
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const char *country; |
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}; |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: doit |
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* |
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* Description: |
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* Parse text to JSON, then render back to text, and print! |
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* |
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****************************************************************************/ |
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static void doit(const char *text) |
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{ |
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char *out; |
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cJSON *json; |
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json = cJSON_Parse(text); |
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if (!json) |
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{ |
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printf("Error before: [%s]\n", cJSON_GetErrorPtr()); |
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} |
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else |
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{ |
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out = cJSON_Print(json); |
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cJSON_Delete(json); |
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printf("%s\n", out); |
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free(out); |
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} |
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} |
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/**************************************************************************** |
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* Name: dofile |
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* |
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* Description: |
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* Read a file, parse, render back, etc. |
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* |
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****************************************************************************/ |
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#if 0 /* Not used */ |
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static void dofile(char *filename) |
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{ |
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FILE *f = fopen(filename, "rb"); |
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fseek(f, 0, SEEK_END); |
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long len = ftell(f); |
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fseek(f, 0, SEEK_SET); |
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char *data = malloc(len + 1); |
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fread(data, 1, len, f); |
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fclose(f); |
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doit(data); |
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free(data); |
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} |
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#endif |
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/**************************************************************************** |
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* Name: create_objects |
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* |
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* Description: |
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* Create a bunch of objects as demonstration. |
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* |
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****************************************************************************/ |
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static void create_objects(void) |
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{ |
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cJSON *root; |
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cJSON *fmt; |
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cJSON *img; |
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cJSON *thm; |
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cJSON *fld; |
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char *out; |
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int i; |
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/* Our "days of the week" array */ |
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static const char *strings[7] = |
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{ |
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"Sunday", "Monday", "Tuesday", "Wednesday", |
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"Thursday", "Friday", "Saturday" |
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}; |
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/* Our matrix: */ |
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static const int numbers[3][3] = { {0, -1, 0}, {1, 0, 0}, {0, 0, 1} }; |
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/* Our "gallery" item: */ |
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static const int ids[4] = { 116, 943, 234, 38793 }; |
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/* Our array of "records": */ |
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static const struct record fields[2] = |
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{ |
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{"zip", 37.7668, -1.223959e+2, "", "SAN FRANCISCO", "CA", "94107", "US"}, |
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{"zip", 37.371991, -1.22026e+2, "", "SUNNYVALE", "CA", "94085", "US"} |
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}; |
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/* Here we construct some JSON standards, from the JSON site. */ |
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/* Our "Video" datatype: */ |
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root = cJSON_CreateObject(); |
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cJSON_AddItemToObject(root, "name", cJSON_CreateString("Jack (\"Bee\") Nimble")); |
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cJSON_AddItemToObject(root, "format", fmt = cJSON_CreateObject()); |
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cJSON_AddStringToObject(fmt, "type", "rect"); |
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cJSON_AddNumberToObject(fmt, "width", 1920); |
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cJSON_AddNumberToObject(fmt, "height", 1080); |
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cJSON_AddFalseToObject(fmt, "interlace"); |
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cJSON_AddNumberToObject(fmt, "frame rate", 24); |
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out = cJSON_Print(root); |
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cJSON_Delete(root); |
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printf("%s\n", out); |
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free(out); |
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/* Print to text, Delete the cJSON, print it, release the string. */ |
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root = cJSON_CreateStringArray(strings, 7); |
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out = cJSON_Print(root); |
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cJSON_Delete(root); |
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printf("%s\n", out); |
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free(out); |
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root = cJSON_CreateArray(); |
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for (i = 0; i < 3; i++) |
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{ |
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cJSON_AddItemToArray(root, cJSON_CreateIntArray(numbers[i], 3)); |
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} |
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/*cJSON_ReplaceItemInArray(root,1,cJSON_CreateString("Replacement")); */ |
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out = cJSON_Print(root); |
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cJSON_Delete(root); |
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printf("%s\n", out); |
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free(out); |
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root = cJSON_CreateObject(); |
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cJSON_AddItemToObject(root, "Image", img = cJSON_CreateObject()); |
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cJSON_AddNumberToObject(img, "Width", 800); |
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cJSON_AddNumberToObject(img, "Height", 600); |
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cJSON_AddStringToObject(img, "Title", "View from 15th Floor"); |
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cJSON_AddItemToObject(img, "Thumbnail", thm = cJSON_CreateObject()); |
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cJSON_AddStringToObject(thm, "Url", "http:/*www.example.com/image/481989943"); |
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cJSON_AddNumberToObject(thm, "Height", 125); |
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cJSON_AddStringToObject(thm, "Width", "100"); |
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cJSON_AddItemToObject(img, "IDs", cJSON_CreateIntArray(ids, 4)); |
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out = cJSON_Print(root); |
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cJSON_Delete(root); |
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printf("%s\n", out); |
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free(out); |
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root = cJSON_CreateArray(); |
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for (i = 0; i < 2; i++) |
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{ |
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cJSON_AddItemToArray(root, fld = cJSON_CreateObject()); |
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cJSON_AddStringToObject(fld, "precision", fields[i].precision); |
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cJSON_AddNumberToObject(fld, "Latitude", fields[i].lat); |
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cJSON_AddNumberToObject(fld, "Longitude", fields[i].lon); |
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cJSON_AddStringToObject(fld, "Address", fields[i].address); |
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cJSON_AddStringToObject(fld, "City", fields[i].city); |
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cJSON_AddStringToObject(fld, "State", fields[i].state); |
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cJSON_AddStringToObject(fld, "Zip", fields[i].zip); |
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cJSON_AddStringToObject(fld, "Country", fields[i].country); |
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} |
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/*cJSON_ReplaceItemInObject(cJSON_GetArrayItem(root,1),"City",cJSON_CreateIntArray(ids,4)); */ |
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out = cJSON_Print(root); |
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cJSON_Delete(root); |
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printf("%s\n", out); |
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free(out); |
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} |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: |
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* |
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* Description: |
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* |
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* |
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****************************************************************************/ |
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int json_main(int argc, const char *argv[]) |
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{ |
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/* a bunch of json: */ |
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static const char text1[] = |
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"{\n" |
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" \"name\": \"Jack (\\\"Bee\\\") Nimble\",\n" |
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" \"format\": {\n" |
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" \"type\": \"rect\",\n" |
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" \"width\": 1920,\n" |
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" \"height\": 1080,\n" |
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" \"interlace\": false,\n" |
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" \"frame rate\": 24\n" |
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" }\n" |
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"}"; |
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static const char text2[] = |
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"[\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"]"; |
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static const char text3[] = |
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"[\n" |
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" [0, -1, 0],\n" |
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" [1, 0, 0],\n" |
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" [0, 0, 1]\n" |
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"]\n"; |
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static const char text4[] = |
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"{\n" |
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" \"Image\": {\n" |
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" \"Width\": 800,\n" |
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" \"Height\": 600,\n" |
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" \"Title\": \"View from 15th Floor\",\n" |
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" \"Thumbnail\": {\n" |
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" \"Url\": \"http:/*www.example.com/image/481989943\",\n" |
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" \"Height\": 125,\n" |
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" \"Width\": \"100\"\n" |
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" },\n" |
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" \"IDs\": [116, 943, 234, 38793]\n" |
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" }\n" |
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"}"; |
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static const char text5[] = |
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"[\n" |
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" {\n" |
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" \"precision\": \"zip\",\n" |
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" \"Latitude\": 37.7668,\n" |
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" \"Longitude\": -122.3959,\n" |
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" \"Address\": \"\",\n" |
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" \"City\": \"SAN FRANCISCO\",\n" |
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" \"State\": \"CA\",\n" |
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" \"Zip\": \"94107\",\n" |
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" \"Country\": \"US\"\n" |
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" },\n" |
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" {\n" |
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" \"precision\": \"zip\",\n" |
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" \"Latitude\": 37.371991,\n" |
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" \"Longitude\": -122.026020,\n" |
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" \"Address\": \"\",\n" |
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" \"City\": \"SUNNYVALE\",\n" |
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" \"State\": \"CA\",\n" |
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" \"Zip\": \"94085\",\n" |
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" \"Country\": \"US\"\n" |
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" }\n" |
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"]"; |
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/* Process each json textblock by parsing, then rebuilding: */ doit(text1); |
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doit(text2); |
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doit(text3); |
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doit(text4); |
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doit(text5); |
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/* Parse standard testfiles: */ |
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#if 0 /* Not yet */ |
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dofile("../../tests/test1"); |
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dofile("../../tests/test2"); |
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dofile("../../tests/test3"); |
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dofile("../../tests/test4"); |
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dofile("../../tests/test5"); |
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#endif |
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/* Now some samplecode for building objects concisely: */ |
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create_objects(); |
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return 0; |
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}
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