json.c File Reference

cJSON helper functions More...

#include <stdio.h>
#include <stdlib.h>
#include "json.h"

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Functions
char *	json_get_char (cJSON *inJson, const char *key)
	Get char string via key from cJSON object. More...
int	json_get_int (cJSON *inJson, const char *key)
	Get integer value via key from cJSON object. More...
void	json_set_int (cJSON *inJson, const char *key, int value)
	Set integer value via key to existed cJSON object. More...
double	json_get_double (cJSON *inJson, const char *key)
	Get double integer value via key from cJSON object. More...
void	json_set_double (cJSON *inJson, const char *key, double value)
	Set double integer value via key to existed cJSON object. More...
long	json_get_long (cJSON *inJson, const char *key)
	Get long integer value via key from cJSON object. More...
int	file_to_json (const char *fname, cJSON **outJson)
	Load JSON file to cJSON object. More...
int	json_to_file (const char *fname, cJSON *inJson)
	Save cJSON object to JSON file. More...

Detailed Description

cJSON helper functions

Author

Taka Wang

Function Documentation

int file_to_json	(	const char *	fname,
		cJSON **	outJson
	)

Load JSON file to cJSON object.

Parameters

fname	File name string.
outJson	Pointer to cJSON output object.

Returns

Success or not.

References cJSON_Parse().

{
    FILE *fPtr = fopen (fname,"rb");
    if (fPtr) 
    {
        fseek(fPtr, 0, SEEK_END);
        long len = ftell (fPtr);
        fseek(fPtr, 0, SEEK_SET);
        char *data = (char*) malloc (len+1);
        if (data != NULL) 
        {
            int _ = fread (data, 1, len, fPtr); _=_;
            fclose (fPtr);
            *outJson = cJSON_Parse (data);
            free (data);
            return outJson ? 0 : 1;
        }
        else
        {
            return -1;
        }
       
    }
    else
    {
        return -1;
    }
}

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char* json_get_char	(	cJSON *	inJson,
		const char *	key
	)

Get char string via key from cJSON object.

Parameters

inJson	cJSON object.
key	Json key.

Returns

C char string.

References cJSON_GetObjectItem(), and cJSON::valuestring.

Referenced by main(), mbtcp_cmd_hanlder(), mbtcp_multi_write_req_fn(), mbtcp_read_bit_req_fn(), mbtcp_read_reg_req_fn(), and mbtcp_single_write_req_fn().

{
    return cJSON_GetObjectItem (inJson, key)->valuestring;
}

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double json_get_double	(	cJSON *	inJson,
		const char *	key
	)

Get double integer value via key from cJSON object.

Parameters

inJson	cJSON object.
key	Json key.

Returns

Double integer value.

References cJSON_GetObjectItem(), and cJSON::valuedouble.

{
    return cJSON_GetObjectItem (inJson, key)->valuedouble;
}

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int json_get_int	(	cJSON *	inJson,
		const char *	key
	)

Get integer value via key from cJSON object.

Parameters

inJson	cJSON object.
key	Json key.

Returns

Integer.

References cJSON_GetObjectItem(), and cJSON::valueint.

Referenced by main(), mbtcp_cmd_hanlder(), mbtcp_multi_write_req_fn(), mbtcp_read_bit_req_fn(), mbtcp_read_reg_req_fn(), and mbtcp_single_write_req_fn().

{
    return cJSON_GetObjectItem (inJson, key)->valueint;
}

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long json_get_long	(	cJSON *	inJson,
		const char *	key
	)

Get long integer value via key from cJSON object.

Parameters

inJson	cJSON object.
key	Json key.

Returns

Long.

References cJSON_GetObjectItem(), and cJSON::valuedouble.

Referenced by main().

{
    // convert double float to long integer
    return (long)cJSON_GetObjectItem(inJson, key)->valuedouble;
}

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void json_set_double	(	cJSON *	inJson,
		const char *	key,
		double	value
	)

Set double integer value via key to existed cJSON object.

Parameters

inJson	cJSON object.
key	Json key.
double	Double integer value.

Returns

Void.

References cJSON_GetObjectItem(), and cJSON::valuedouble.

{
    cJSON_GetObjectItem (inJson, key)->valuedouble = value;
}

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void json_set_int	(	cJSON *	inJson,
		const char *	key,
		int	value
	)

Set integer value via key to existed cJSON object.

Parameters

inJson	cJSON object.
key	Json key.
value	Integer value.

Returns

Void.

References cJSON_GetObjectItem(), and cJSON::valueint.

{
    cJSON_GetObjectItem (inJson, key)->valueint = value;
}

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int json_to_file	(	const char *	fname,
		cJSON *	inJson
	)

Save cJSON object to JSON file.

Parameters

fname	File name string.
inJson	cJSON input object.

Returns

Success or not.

References cJSON_Print().

{
    FILE *fPtr = fopen(fname, "w");
    if (fPtr)
    {
        fprintf (fPtr, "%s", cJSON_Print (inJson));
        fclose (fPtr);
        return 0;
    }
    else
    {
        return -1;
    }
}

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