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Diffstat (limited to 'apps/examples/wgetjson/wgetjson_main.c')
-rw-r--r-- | apps/examples/wgetjson/wgetjson_main.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/apps/examples/wgetjson/wgetjson_main.c b/apps/examples/wgetjson/wgetjson_main.c new file mode 100644 index 000000000..7f3096797 --- /dev/null +++ b/apps/examples/wgetjson/wgetjson_main.c @@ -0,0 +1,305 @@ +/**************************************************************************** + * examples/wgetjson/wgetjson_main.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Darcy Gong + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdbool.h> + +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <debug.h> + +#include <apps/netutils/uiplib.h> +#include <apps/netutils/webclient.h> +#include <apps/netutils/cJSON.h> + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +#ifndef CONFIG_EXAMPLES_WGETJSON_MAXSIZE +# define CONFIG_EXAMPLES_WGETJSON_MAXSIZE 1024*10 +#endif + +#ifndef CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL +# define CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL "http://10.0.0.1/wgetjson/json_cmd.php" +#endif + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static char *g_json_buff = NULL; +static int g_json_bufflen = 0; +static bool g_has_json = false; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: wgetjson_callback + ****************************************************************************/ + +static void wgetjson_callback(FAR char **buffer, int offset, int datend, + FAR int *buflen, FAR void *arg) +{ + int len = datend - offset,org=len; + + if (len <= 0) + { + return; + } + + if (!g_json_buff) + { + g_json_buff = malloc(len + 1); + memcpy(g_json_buff, &((*buffer)[offset]), len); + g_json_buff[len] = 0; + g_json_bufflen = len; + } + else + { + if (g_json_bufflen >= CONFIG_EXAMPLES_WGETJSON_MAXSIZE) + { + g_json_bufflen += org; + return; + } + + if (g_json_bufflen+len > CONFIG_EXAMPLES_WGETJSON_MAXSIZE) + { + len = CONFIG_EXAMPLES_WGETJSON_MAXSIZE - g_json_bufflen; + } + + g_json_buff = realloc(g_json_buff, g_json_bufflen + len + 1); + memcpy(&g_json_buff[g_json_bufflen-1], &((*buffer)[offset]), len); + g_json_buff[g_json_bufflen + len] = 0; + g_json_bufflen += org; + } +} + +/**************************************************************************** + * Name: wgetjson_json_release + ****************************************************************************/ + +static void wgetjson_json_release(void) +{ + if (g_json_buff) + { + free(g_json_buff); + g_json_buff = NULL; + } + + g_json_bufflen = 0; +} + +/**************************************************************************** + * Name: wgetjson_doit + ****************************************************************************/ + +#if 0 /* Not used */ +static void wgetjson_doit(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); + } +} +#endif + +/**************************************************************************** + * Name: wgetjson_json_item_callback + ****************************************************************************/ + +static int wgetjson_json_item_callback(const char *name,int type,cJSON *item) +{ + if (strlen(name) > 8 && !memcmp(name, "/(null)", 7)) + { + name += 8; + g_has_json = true; + } + + if (!strcmp(name, "name")) + { + printf("name:\t\t\t%s \n", item->valuestring); + // todo something.... + } + else if (strcmp(name, "format/type")==0) + { + printf("format/type:\t\t%s \n", item->valuestring); + // todo something.... + } + else if (!strcmp(name, "format/width")) + { + printf("format/width:\t\t%d \n", item->valueint); + // todo something.... + } + else if (!strcmp(name, "format/height")) + { + printf("format/height:\t\t%d \n", item->valueint); + // todo something.... + } + else if (!strcmp(name, "format/interlace")) + { + printf("format/interlace:\t%s \n", (item->valueint) ? "true" : "false"); + // todo something.... + } + else if (!strcmp(name, "format/frame rate")) + { + printf("format/frame rate:\t%d \n", item->valueint); + // todo something.... + } + + return 1; +} + +/**************************************************************************** + * Name: wgetjson_json_item_scan + ****************************************************************************/ + +static void wgetjson_json_item_scan(cJSON *item, const char *prefix) +{ + char *newprefix; + int dorecurse; + + while (item) + { + newprefix = malloc(strlen(prefix) + strlen(item->string) + 2); + sprintf(newprefix, "%s/%s", prefix, item->string); + + dorecurse = wgetjson_json_item_callback(newprefix, item->type, item); + if (item->child && dorecurse) + { + wgetjson_json_item_scan(item->child, newprefix); + } + + item = item->next; + free(newprefix); + } +} + +/**************************************************************************** + * Name: wgetjson_json_parse + ****************************************************************************/ + +static int wgetjson_json_parse(char *text) +{ + cJSON *json; + char *path = ""; + + json=cJSON_Parse(text); + if (!json) + { + printf("Error before: [%s]\n", cJSON_GetErrorPtr()); + return ERROR; + } + else + { + wgetjson_json_item_scan(json, path); + cJSON_Delete(json); + return OK; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: wgetjson_main + ****************************************************************************/ + +int wgetjson_main(int argc, char *argv[]) +{ + char *buffer = NULL; + char *url = CONFIG_EXAMPLES_EXAMPLES_WGETJSON_URL; + int ret; + + buffer = malloc(512); + wgetjson_json_release(); + + printf("URL: %s\n", url); + + ret = wget(url, buffer, 512, wgetjson_callback, NULL); + if (ret < 0) + { + printf("get json size: %d\n",g_json_bufflen); + } + else + { + g_has_json = false; + if (wgetjson_json_parse(g_json_buff) == OK && g_has_json) + { + printf("Parse OK\n"); + } + else + { + printf("Parse error\n"); + } + + g_has_json = false; + } + + wgetjson_json_release(); + free(buffer); + return 0; +} |