mirror of https://github.com/DaveGamble/cJSON
269 lines
7.5 KiB
C
269 lines
7.5 KiB
C
/*
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Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
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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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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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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cJSON.h"
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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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/* Create a bunch of objects as demonstration. */
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static int print_preallocated(cJSON *root)
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{
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/* declarations */
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char *out = NULL;
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char *buf = NULL;
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char *buf_fail = NULL;
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size_t len = 0;
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size_t len_fail = 0;
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/* formatted print */
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out = cJSON_Print(root);
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/* create buffer to succeed */
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/* the extra 5 bytes are because of inaccuracies when reserving memory */
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len = strlen(out) + 5;
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buf = (char*)malloc(len);
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if (buf == NULL)
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{
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printf("Failed to allocate memory.\n");
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exit(1);
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}
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/* create buffer to fail */
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len_fail = strlen(out);
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buf_fail = (char*)malloc(len_fail);
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if (buf_fail == NULL)
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{
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printf("Failed to allocate memory.\n");
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exit(1);
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}
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/* Print to buffer */
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if (!cJSON_PrintPreallocated(root, buf, (int)len, 1)) {
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printf("cJSON_PrintPreallocated failed!\n");
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if (strcmp(out, buf) != 0) {
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printf("cJSON_PrintPreallocated not the same as cJSON_Print!\n");
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printf("cJSON_Print result:\n%s\n", out);
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printf("cJSON_PrintPreallocated result:\n%s\n", buf);
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}
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free(out);
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free(buf_fail);
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free(buf);
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return -1;
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}
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/* success */
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printf("%s\n", buf);
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/* force it to fail */
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if (cJSON_PrintPreallocated(root, buf_fail, (int)len_fail, 1)) {
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printf("cJSON_PrintPreallocated failed to show error with insufficient memory!\n");
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printf("cJSON_Print result:\n%s\n", out);
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printf("cJSON_PrintPreallocated result:\n%s\n", buf_fail);
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free(out);
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free(buf_fail);
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free(buf);
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return -1;
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}
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free(out);
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free(buf_fail);
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free(buf);
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return 0;
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}
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/* Create a bunch of objects as demonstration. */
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static void create_objects(void)
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{
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/* declare a few. */
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cJSON *root = NULL;
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cJSON *fmt = NULL;
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cJSON *img = NULL;
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cJSON *thm = NULL;
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cJSON *fld = NULL;
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int i = 0;
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/* Our "days of the week" array: */
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const char *strings[7] =
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{
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday"
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};
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/* Our matrix: */
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int numbers[3][3] =
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{
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{0, -1, 0},
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{1, 0, 0},
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{0 ,0, 1}
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};
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/* Our "gallery" item: */
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int ids[4] = { 116, 943, 234, 38793 };
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/* Our array of "records": */
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struct record fields[2] =
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{
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{
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"zip",
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37.7668,
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-1.223959e+2,
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"",
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"SAN FRANCISCO",
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"CA",
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"94107",
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"US"
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},
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{
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"zip",
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37.371991,
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-1.22026e+2,
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"",
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"SUNNYVALE",
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"CA",
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"94085",
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"US"
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}
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};
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volatile double zero = 0.0;
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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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/* Print to text */
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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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/* Our "days of the week" array: */
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root = cJSON_CreateStringArray(strings, 7);
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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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/* Our matrix: */
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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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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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/* Our "gallery" item: */
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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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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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/* Our array of "records": */
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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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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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root = cJSON_CreateObject();
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cJSON_AddNumberToObject(root, "number", 1.0 / zero);
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if (print_preallocated(root) != 0) {
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cJSON_Delete(root);
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exit(EXIT_FAILURE);
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}
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cJSON_Delete(root);
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}
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int main(void)
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{
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/* print the version */
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printf("Version: %s\n", cJSON_Version());
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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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