简介

本文章主要介绍下parson库的使用
parson : parson是用C语言开发的一个json解析库，提供json的序列化和反序列化功能。使用时只需要在我们的工程中引入头文件parson.h和源文件parson.c即可使用。

使用parson解析json

单层json结构解析

代码

  const char* resp = "{\"code\":0, \"flag\":true, \"msg\":\"success\"}";bool bRet = false;JSON_Value *rootValue = NULL;do {//反序列化为json对象rootValue = json_parse_string(resp);if (rootValue == NULL) {break;}JSON_Object *rootObject = json_value_get_object(rootValue);if (rootObject == NULL) {break;}if (!json_object_has_value(rootObject, "code")) {break;}int code = json_object_get_number(rootObject, "code");if (!json_object_has_value(rootObject, "flag")) {break;}bool flag = json_object_get_boolean(rootObject, "flag");if (!json_object_has_value(rootObject, "msg")) {break;}const char* msg = json_object_get_string(rootObject, "msg");printf("code = %d, flag = %d, msg = %s\n", code, flag, msg);bRet = true;} while (0);if (rootValue != NULL) {json_value_free(rootValue);rootValue = NULL;}return bRet;

执行结果
```
  code = 0, flag = 1, msg = success
```

多层json结构解析

代码

  const char* resp = "{\"code\":0, \"msg\":\"success\", \"data\":{\"name\":\"lucy\", \"score\":99.5}}";bool bRet = false;JSON_Value *rootValue = NULL;do {rootValue = json_parse_string(resp);if (rootValue == NULL) {break;}JSON_Object *rootObject = json_value_get_object(rootValue);if (rootObject == NULL) {break;}  if (!json_object_has_value(rootObject, "code")) {break;}int code = json_object_get_number(rootObject, "code");if (!json_object_has_value(rootObject, "msg")) {break;}const char* msg = json_object_get_string(rootObject, "msg");if (!json_object_has_value(rootObject, "data")) {break;}JSON_Object *dataObject = json_object_get_object(rootObject, "data");if (dataObject == NULL) {break;}if (!json_object_has_value(dataObject, "name")) {break;}const char* name = json_object_get_string(dataObject, "name");if (!json_object_has_value(dataObject, "score")) {break;}double score = json_object_get_number(dataObject, "score");printf("code = %d, msg = %s, name = %s, score = %lf\n", code, msg, name, score);bRet = true;} while (0);if (rootValue != NULL) {json_value_free(rootValue);rootValue = NULL;}return bRet;

执行结果

  code = 0, msg = success, name = lucy, score = 99.500000

有数组的json结构解析

代码

  const char* resp = "{\"code\":0, \"msg\":\"success\", \"result\":[\"tcp\", \"udp\", \"http\", \"tls\"]}";bool bRet = false;JSON_Value *root_value = NULL;do {root_value = json_parse_string(resp);if (root_value == NULL) {break;}JSON_Object *root_object = json_value_get_object(root_value);if (root_object == NULL) {break;}if (!json_object_has_value(root_object, "code")) {break;}int code = json_object_get_number(root_object, "code");printf("code is %d\n", code);if (!json_object_has_value(root_object, "msg")) {break;}const char* msg = json_object_get_string(root_object, "msg");printf("msg is %s\n", msg);if (!json_object_has_value(root_object, "result")) {break;}JSON_Array *result_obj = json_object_get_array(root_object, "result");if (result_obj == NULL) {break;}printf("result: ");for (int i = 0; i < json_array_get_count(result_obj); i++) {const char *pStr = json_array_get_string(result_obj, i);if (pStr != NULL) {printf("%s ", pStr);}}printf("\n");bRet = true;} while (0);if (root_value != NULL) {json_value_free(root_value);root_value = NULL;}return bRet;

执行结果

  code is 0msg is successresult: tcp udp http tls

json文件解析

文件内容 test.json

  {"code":0,"flag":true,"msg":"success"}

代码

  bool bRet = false;JSON_Value *rootValue = NULL;do {// 如果json文件内容带注释可用这个函数 json_parse_file_with_commentsrootValue = json_parse_file("test.json");if (rootValue == NULL) {break;}JSON_Object *rootObject = json_value_get_object(rootValue);if (rootObject == NULL) {break;}if (!json_object_has_value(rootObject, "code")) {break;}int code = json_object_get_number(rootObject, "code");if (!json_object_has_value(rootObject, "flag")) {break;}bool flag = json_object_get_boolean(rootObject, "flag");if (!json_object_has_value(rootObject, "msg")) {break;}const char* msg = json_object_get_string(rootObject, "msg");printf("code = %d, flag = %d, msg = %s\n", code, flag, msg);bRet = true;} while (0);if (rootValue != NULL) {json_value_free(rootValue);rootValue = NULL;}return bRet;

执行结果
```
  code = 0, flag = 1, msg = success
```

使用parson构建json

单层json结构构建

代码

  bool bRet = false;JSON_Value *root_value = NULL;do {root_value = json_value_init_object();if (root_value == NULL) {break;}JSON_Object *root_object = json_value_get_object(root_value);if (root_object == NULL) {break;}json_object_set_number(root_object, "code", 0);json_object_set_boolean(root_object, "flag", true);json_object_set_string(root_object, "msg", "success");json_object_set_number(root_object, "rate", 10.5);char *data = json_serialize_to_string(root_value);if (data == NULL) {break;}printf("%s\n", data);bRet = true;json_free_serialized_string(data);} while (0);if (root_value != NULL) {json_value_free(root_value);root_value = NULL;}return bRet;

执行结果

  {"code":0,"flag":true,"msg":"success","rate":10.5}

多层json结构构建

代码

  bool bRet = false;JSON_Value *root_value = NULL;do {root_value = json_value_init_object();if (root_value == NULL) {break;}JSON_Object *root_object = json_value_get_object(root_value);if (root_object == NULL) {break;}JSON_Value *data_value = json_value_init_object();if (data_value == NULL) {break;}JSON_Object *data_object = json_value_get_object(data_value);if (data_object == NULL) {break;}json_object_set_string(data_object, "name", "jack");json_object_set_number(data_object, "age", 28);json_object_set_number(root_object, "code", 0);json_object_set_boolean(root_object, "flag", true);json_object_set_string(root_object, "msg", "success");json_object_set_value(root_object, "data", data_value);char *data = json_serialize_to_string(root_value);if (data == NULL) {break;}printf("%s\n", data);bRet = true;json_free_serialized_string(data);} while (0);if (root_value != NULL) {json_value_free(root_value);root_value = NULL;}return bRet;

执行结果

  {"code":0,"flag":true,"msg":"success","data":{"name":"jack","age":28}}

带有数组的json结构构建

代码

  bool bRet = false;JSON_Value *root_value = NULL;do {root_value = json_value_init_object();if (root_value == NULL) {break;}JSON_Object *root_object = json_value_get_object(root_value);if (root_object == NULL) {break;}JSON_Value *data_value = json_value_init_object();if (data_value == NULL) {break;}JSON_Object *data_object = json_value_get_object(data_value);if (data_object == NULL) {break;}JSON_Value *dataValueArray = json_value_init_array();if (dataValueArray == NULL) {break;}JSON_Array *dataObjectArray = json_value_get_array(dataValueArray);if (dataObjectArray == NULL) {break;}for (int i = 0; i < 5; i++) {JSON_Value *pValue = json_value_init_object();if (pValue == NULL) {break;}JSON_Object *pObject = json_value_get_object(pValue);if (pObject == NULL) {break;}json_object_set_number(pObject, "index", i);json_object_set_string(pObject, "status","success");json_array_append_value(dataObjectArray, pValue);}json_object_set_string(data_object, "name", "jack");json_object_set_number(data_object, "age", 28);json_object_set_number(root_object, "code", 0);json_object_set_boolean(root_object, "flag", true);json_object_set_string(root_object, "msg", "success");json_object_set_value(root_object, "data", dataValueArray);char *data = json_serialize_to_string(root_value);if (data == NULL) {break;}printf("%s\n", data);bRet = true;json_free_serialized_string(data);} while (0);if (root_value != NULL) {json_value_free(root_value);root_value = NULL;}return bRet;

执行结果

  {"code":0,"flag":true,"msg":"success","data":[{"index":0,"status":"success"},{"index":1,"status":"success"},{"index":2,"status":"success"},{"index":3,"status":"success"},{"index":4,"status":"success"}]}

构建json并保存到文件

代码

  bool bRet = false;JSON_Value *root_value = NULL;do {root_value = json_value_init_object();if (root_value == NULL) {break;}JSON_Object *root_object = json_value_get_object(root_value);if (root_object == NULL) {break;}json_object_set_number(root_object, "code", 0);json_object_set_boolean(root_object, "flag", true);json_object_set_string(root_object, "msg", "success");json_object_set_number(root_object, "rate", 10.5);JSON_Status status = json_serialize_to_file(root_value, "test.json");if (status == JSONFailure) {break;}bRet = true;} while (0);if (root_value != NULL) {json_value_free(root_value);root_value = NULL;}return bRet;

test.json文件内容

  {"code":0,"flag":true,"msg":"success","rate":10.5}

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c语言json库parson的介绍和使用

简介

使用parson解析json

使用parson构建json

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