IoTGateway/AdvJSON

What is JSON?

• JSON stands for JavaScript Object Notation
• JSON is a lightweight data-interchange format
• JSON is language independent
• JSON is "self-describing" and easy to understand

C functions

List

int JSON_Validator(const char *json);

Description

• This function validates a string in JSON format.

Parameters

• json [POINTER]
  • a string.

Return Values

• [0|1] Error or Success.

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JSONode *JSON_Parser(const char *json);

Description

• Translate a string into a tree structure pointer(JSONode);

Parameters

• json [POINTER]
  • a string.

Return Values

• (JSONode *)
  • A pointer describes a JSON tree structure.

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void JSON_Destory(JSONode **json);

Description

• Destory a JSON tree sturcture;

Parameters

• json [POINTER]
  • double-pointer of JSON tree sturcture.

Return Values

• None

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JSONode *JSON_Copy(JSONode *json);

Description

• Copy a JSON tree sturcture into another pointer.

Parameters

• json [POINTER]
  • source pointer

Return Values

• (JSONode *)
  • result pointer

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void JSON_Get(JSONode *json, const char *path, char *result, int size);

Description

• A Structured-Path-Query function.

Parameters

• json [POINTER]
  • source.
• path [POINTER]
  • a structure-path string
• result [POINTER]
  • result string
• size [NUMBER]
  • the size of result.

Return Values

• None

Example

char result[256];
JSON_Get(json, "[a][b][c][d]", result, 256);
JSON_Get(json, "/a/b/c/d", result, 256);

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void JSON_Cmd(JSONode *json, const char *path, char *assign, int size);

Description

• A Command-line-like function.

Parameters

• json [POINTER]
  • source.
• path [POINTER]
  • a command string
• assign[POINTER]
  • target
• size [NUMBER]
  • the size of target.

Return Values

• None

Example

JSON_Cmd(json, "New [a][b][c][d]", "123", 3);
JSON_Cmd(json, "POST /a/b/c/d", "123", 3);