326 lines
9.3 KiB
C
326 lines
9.3 KiB
C
/****************************************************************************
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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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