Functions to read, write and manage JSON Objects
Functions to read, write and manage JSON Objects
static JSON alloc(char* jsonString = 0)
Allocate a new JSON object. The object must be released with json::release
| Name | Type | Default | Description |
| Return | JSON | JSON object. The object must be released with json::release. 0 : object could not be allocated or error when parsing the (optional) JSON string |
|
| jsonString | String or char* | 0 | JSON string. If provided, the JSON object is initialized using this value. |
static JSON parse_object(char* jsonString)
Parse a new JSON object from a given JSON string. This function is equivalent to json::alloc with mandatory jsaonString parameter.
| Name | Type | Default | Description |
| Return | JSON | JSON object. The object must be released with json::release 0 : object could not be allocated or error when parsing the JSON string. |
|
| jsonString | String or char* | - | JSON string |
Check, whether a string represents a json object (i.e. ).
int main ()
{
JSON test = json::parse_object ("{\"message\" : \"could be valid or not\", \"code\" : 123}");
if (test)
{
// valid json string, release
json::release(test);
}
else
{
// ...
}
return 0;
}
static StringList parse_array(char* jsonString)
Parse a new JSON object from a given JSON string. This function is equivalent to json::alloc with mandatory jsaonString parameter.
| Name | Type | Default | Description |
| Return | JSON | JSON object. The object must be released with json::release 0 : object could not be allocated or error when parsing the JSON string. |
|
| jsonString | String or char* | - | JSON string |
static JSON read(char* path)
Allocate a new JSON object from an input file in JSON format. The object must be released with json::release
| Name | Type | Default | Description |
| Return | JSON | JSON object. The object must be released with json::release 0 : object could not be allocated or error when parsing the JSON string. |
|
| jsonString | String or char* | - | Complete path of a JSON file |
static int write(JSON json, char* path)
Write a JSON object to an output file.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| json | JSON | - | Valid JSON object |
| path | String oder char* | - | Complete path of the output file. If the file already exists, it will be overwritten. If a folder with the same name exists, the error fnfErr is returned. |
static int release(JSON jsonObject)
Release an allocated JSON object.
Only objects that have been allocated with json::alloc, json::parse_object, json::parse_array or json::read may be released.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
static int set_string(
JSON jsonObject,
char* property,
char* value)
Set the value of a property of a JSON object. The value is transferred as a character string.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
| value | String or char* | - | New value of the property as a character string |
static int set_int(
JSON jsonObject,
char* property,
int value)
Set the value of a property of a JSON object. The value is given as integer.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
| value | int | - | New value of the property given as integer |
static int set_float(
JSON jsonObject,
char* property,
float value)
Set the value of a property of a JSON object. The value is given as a floating point number.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
| value | float | - | New value of the property given as floating point number |
static int set_list(
JSON jsonObject,
char* property,
StringList value)
Set the value of a property of a JSON object. The value is given as a list of strings.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
| value | StringList | - | New value of the property given as list of strings |
static int set_object(
JSON jsonObject,
char* property,
JSON value)
Insert a JSON sub-object into a JSON object.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
| value | JSON | - | Valid JSON object as a sub-object of the given object |
static int set_error(
JSON jsonObject,
int errorCode,
char* errorClass = 0,
char* errorMessage = 0)
Set a JSON error.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| errorCode | int | - | Set the attribute errorCode of the given JSON object |
| errorClass | String oder char* | - | Set the attribute errorClass of the given JSON object |
| errorMessage | String oder char* | - | Set the attribute errorMessage of the given JSON object |
static StringList get_attributes(JSON jsonObject)
Get a list of all attribute names of a JSON object.
The received list of attribute names must be released again with stringlist::release!
| Name | Type | Default | Description |
| Return | StringList | List of all attribute names of the JSON object. The received list must be released again with stringlist::release! | |
| jsonObject | JSON | - | Valid JSON object |
static int get_type(JSON jsonObject, char* property)
Determine the data type of a JSON attribute.
| Name | Type | Default | Description |
| Return | int | 0 : No type or error 1 : kInt 2 : kFloat 3 : kString 7 : kStringList 8 : kObject (JSON object) |
|
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
static char* get_string(JSON jsonObject, char* property)
Determine the string value of a property of a JSON object.
| Name | Type | Default | Description |
| Return | char* | Text value of the attribute or 0 The return value is read only, do NOT CHANGE. The result will be overridden on following calls to the function. See here to learn more about functions returning r/o char* values. |
|
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
static int get_int(JSON jsonObject, char* property)
| Name | Type | Default | Description |
| Return | int | Integer value of the property or 0. Please note that 0 can be both an error and a value. In this case, check the existence and type of the attribute! | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
static int get_float(JSON jsonObject, char* property)
Determine the floating-point value of a property of a JSON object.
| Name | Type | Default | Description |
| Return | int | Float value of the property or 0.0. Please note that 0 can be both an error and a value. In this case, check the existence and type of the attribute! | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
static StringList get_list(JSON jsonObject, char* property)
Determine the list of values of a JSON attribute.
The list of values received must be released again with stringlist::release!
| Name | Type | Default | Description |
| Return | StringList | Value list of the JSON attribute The received list must be released again with stringlist::release! | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of a property of the given JSON object |
static JSON get_object(JSON jsonObject, char* property)
Get a sub-object of a JSON object.
| Name | Type | Default | Description |
| Return | JSON | Subobject of the searched name or 0 | |
| jsonObject | JSON | - | Valid JSON object |
| property | String or char* | - | Valid name of the sub-object of the given JSON object |
static int get_error(
JSON jsonObject,
char* errorClass = 0,
char* errorMessage = 0)
Get the error description stored in the JSON object.
| Name | Type | Default | Description |
| Return | int | Value of attribute errorCode | |
| jsonObject | JSON | - | Valid JSON object |
| errorClass | String oder char* | - | Allokierter Speicher für das Attribut errorClass des gegebenen JSON-Objektes |
| errorMessage | String oder char* | - | Allokierter Speicher für das Attribut errorMessage des gegebenen JSON-Objektes |
static int serialize(JSON jsonObject, char* destination)
Export a given JSON to a string.
| Name | Type | Default | Description |
| Return | int | 0 or Error Code | |
| jsonObject | JSON | - | Valid JSON object |
| destination | String oder char* | - | Allocated memory for the result. Since you do not know the exact length, it is recommended to use a varibale of type String here! |
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