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Diffstat (limited to 'apps/examples/json/json_main.c')
| -rw-r--r-- | apps/examples/json/json_main.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/apps/examples/json/json_main.c b/apps/examples/json/json_main.c new file mode 100644 index 000000000..443be387b --- /dev/null +++ b/apps/examples/json/json_main.c @@ -0,0 +1,325 @@ +/**************************************************************************** + * apps/examples/json/json_main.c + * + * This file is a part of NuttX: + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Ported by: Darcy Gong + * + * And derives from the cJSON Project which has an MIT license: + * + * Copyright (c) 2009 Dave Gamble + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <apps/netutils/cJSON.h> + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/* Used by some code below as an example datatype. */ + +struct record +{ + const char *precision; + double lat; + double lon; + const char *address; + const char *city; + const char *state; + const char *zip; + const char *country; +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: doit + * + * Description: + * Parse text to JSON, then render back to text, and print! + * + ****************************************************************************/ + +static void doit(const char *text) +{ + char *out; + cJSON *json; + json = cJSON_Parse(text); + if (!json) + { + printf("Error before: [%s]\n", cJSON_GetErrorPtr()); + } + else + { + out = cJSON_Print(json); + cJSON_Delete(json); + printf("%s\n", out); + free(out); + } +} + +/**************************************************************************** + * Name: dofile + * + * Description: + * Read a file, parse, render back, etc. + * + ****************************************************************************/ + +#if 0 /* Not used */ +static void dofile(char *filename) +{ + FILE *f = fopen(filename, "rb"); + fseek(f, 0, SEEK_END); + long len = ftell(f); + fseek(f, 0, SEEK_SET); + char *data = malloc(len + 1); + fread(data, 1, len, f); + fclose(f); + doit(data); + free(data); +} +#endif + +/**************************************************************************** + * Name: create_objects + * + * Description: + * Create a bunch of objects as demonstration. + * + ****************************************************************************/ + +static void create_objects(void) +{ + cJSON *root; + cJSON *fmt; + cJSON *img; + cJSON *thm; + cJSON *fld; + char *out; + int i; + + /* Our "days of the week" array */ + + static const char *strings[7] = + { + "Sunday", "Monday", "Tuesday", "Wednesday", + "Thursday", "Friday", "Saturday" + }; + + /* Our matrix: */ + + static const int numbers[3][3] = { {0, -1, 0}, {1, 0, 0}, {0, 0, 1} }; + + /* Our "gallery" item: */ + + static const int ids[4] = { 116, 943, 234, 38793 }; + + /* Our array of "records": */ + + static const struct record fields[2] = + { + {"zip", 37.7668, -1.223959e+2, "", "SAN FRANCISCO", "CA", "94107", "US"}, + {"zip", 37.371991, -1.22026e+2, "", "SUNNYVALE", "CA", "94085", "US"} + }; + + /* Here we construct some JSON standards, from the JSON site. */ + /* Our "Video" datatype: */ + + root = cJSON_CreateObject(); + cJSON_AddItemToObject(root, "name", cJSON_CreateString("Jack (\"Bee\") Nimble")); + cJSON_AddItemToObject(root, "format", fmt = cJSON_CreateObject()); + cJSON_AddStringToObject(fmt, "type", "rect"); + cJSON_AddNumberToObject(fmt, "width", 1920); + cJSON_AddNumberToObject(fmt, "height", 1080); + cJSON_AddFalseToObject(fmt, "interlace"); + cJSON_AddNumberToObject(fmt, "frame rate", 24); + out = cJSON_Print(root); + cJSON_Delete(root); + printf("%s\n", out); + free(out); + + /* Print to text, Delete the cJSON, print it, release the string. */ + + root = cJSON_CreateStringArray(strings, 7); + out = cJSON_Print(root); + cJSON_Delete(root); + printf("%s\n", out); + free(out); + + root = cJSON_CreateArray(); + for (i = 0; i < 3; i++) + { + cJSON_AddItemToArray(root, cJSON_CreateIntArray(numbers[i], 3)); + } + +/*cJSON_ReplaceItemInArray(root,1,cJSON_CreateString("Replacement")); */ + out = cJSON_Print(root); + cJSON_Delete(root); + printf("%s\n", out); + free(out); + + root = cJSON_CreateObject(); + cJSON_AddItemToObject(root, "Image", img = cJSON_CreateObject()); + cJSON_AddNumberToObject(img, "Width", 800); + cJSON_AddNumberToObject(img, "Height", 600); + cJSON_AddStringToObject(img, "Title", "View from 15th Floor"); + cJSON_AddItemToObject(img, "Thumbnail", thm = cJSON_CreateObject()); + cJSON_AddStringToObject(thm, "Url", "http:/*www.example.com/image/481989943"); + cJSON_AddNumberToObject(thm, "Height", 125); + cJSON_AddStringToObject(thm, "Width", "100"); + cJSON_AddItemToObject(img, "IDs", cJSON_CreateIntArray(ids, 4)); + out = cJSON_Print(root); + cJSON_Delete(root); + printf("%s\n", out); + free(out); + + root = cJSON_CreateArray(); + for (i = 0; i < 2; i++) + { + cJSON_AddItemToArray(root, fld = cJSON_CreateObject()); + cJSON_AddStringToObject(fld, "precision", fields[i].precision); + cJSON_AddNumberToObject(fld, "Latitude", fields[i].lat); + cJSON_AddNumberToObject(fld, "Longitude", fields[i].lon); + cJSON_AddStringToObject(fld, "Address", fields[i].address); + cJSON_AddStringToObject(fld, "City", fields[i].city); + cJSON_AddStringToObject(fld, "State", fields[i].state); + cJSON_AddStringToObject(fld, "Zip", fields[i].zip); + cJSON_AddStringToObject(fld, "Country", fields[i].country); + } + +/*cJSON_ReplaceItemInObject(cJSON_GetArrayItem(root,1),"City",cJSON_CreateIntArray(ids,4)); */ + out = cJSON_Print(root); + cJSON_Delete(root); + printf("%s\n", out); + free(out); +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ +/**************************************************************************** + * Name: + * + * Description: + * + * + ****************************************************************************/ + +int json_main(int argc, const char *argv[]) +{ + /* a bunch of json: */ + + static const char text1[] = + "{\n" + " \"name\": \"Jack (\\\"Bee\\\") Nimble\",\n" + " \"format\": {\n" + " \"type\": \"rect\",\n" + " \"width\": 1920,\n" + " \"height\": 1080,\n" + " \"interlace\": false,\n" + " \"frame rate\": 24\n" + " }\n" + "}"; + + static const char text2[] = + "[\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"]"; + + static const char text3[] = + "[\n" + " [0, -1, 0],\n" + " [1, 0, 0],\n" + " [0, 0, 1]\n" + "]\n"; + + static const char text4[] = + "{\n" + " \"Image\": {\n" + " \"Width\": 800,\n" + " \"Height\": 600,\n" + " \"Title\": \"View from 15th Floor\",\n" + " \"Thumbnail\": {\n" + " \"Url\": \"http:/*www.example.com/image/481989943\",\n" + " \"Height\": 125,\n" + " \"Width\": \"100\"\n" + " },\n" + " \"IDs\": [116, 943, 234, 38793]\n" + " }\n" + "}"; + + static const char text5[] = + "[\n" + " {\n" + " \"precision\": \"zip\",\n" + " \"Latitude\": 37.7668,\n" + " \"Longitude\": -122.3959,\n" + " \"Address\": \"\",\n" + " \"City\": \"SAN FRANCISCO\",\n" + " \"State\": \"CA\",\n" + " \"Zip\": \"94107\",\n" + " \"Country\": \"US\"\n" + " },\n" + " {\n" + " \"precision\": \"zip\",\n" + " \"Latitude\": 37.371991,\n" + " \"Longitude\": -122.026020,\n" + " \"Address\": \"\",\n" + " \"City\": \"SUNNYVALE\",\n" + " \"State\": \"CA\",\n" + " \"Zip\": \"94085\",\n" + " \"Country\": \"US\"\n" + " }\n" + "]"; + + /* Process each json textblock by parsing, then rebuilding: */ doit(text1); + + doit(text2); + doit(text3); + doit(text4); + doit(text5); + + /* Parse standard testfiles: */ + +#if 0 /* Not yet */ + dofile("../../tests/test1"); + dofile("../../tests/test2"); + dofile("../../tests/test3"); + dofile("../../tests/test4"); + dofile("../../tests/test5"); +#endif + + /* Now some samplecode for building objects concisely: */ + + create_objects(); + return 0; +} |