夜深了 人也静了 来写一篇博文吧
此次博主介绍 cjson 这款类库的使用,博主用的是 vs2022
下载 cjson
https://github.com/DaveGamble/cJSON
直接复制 cJSON.h cJSON.c 文件到项目中
中文乱码问题
首先将文件保存成 UTF8 带签名 65001 也就是 UTF8-BOM
其次使用 Unicode字符集 并且添加 /utf8 编译选项
对象
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| //设置控制台编码 #include <Windows.h> 65001 = utf-8
SetConsoleOutputCP(65001);
cJSON* obj = cJSON_CreateObject();
cJSON* nameVal = cJSON_CreateString("张三是haha3596..");
cJSON* ageVal = cJSON_CreateNumber(135);
cJSON_AddItemToObject(obj, "name", nameVal);
cJSON_AddItemToObject(obj, "age", ageVal);
char* rendered = cJSON_Print(obj);
printf("\n %s \n", rendered);
free(rendered);
cJSON_Delete(obj);
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数组
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| SetConsoleOutputCP(65001);
cJSON* arr = cJSON_CreateArray();
cJSON* arrItem = cJSON_CreateObject();
cJSON* name = cJSON_CreateString("张三");
cJSON* age = cJSON_CreateNumber(50);
cJSON_AddItemToObject(arrItem, "name", name);
cJSON_AddItemToObject(arrItem, "age", age);
cJSON_AddItemToArray(arr, arrItem);
cJSON* arrItem2 = cJSON_CreateObject();
cJSON* name2 = cJSON_CreateString("李四");
cJSON* age2 = cJSON_CreateNumber(80);
cJSON_AddItemToObject(arrItem2, "name", name2);
cJSON_AddItemToObject(arrItem2, "age", age2);
cJSON_AddItemToArray(arr, arrItem2);
char* rendered = cJSON_Print(arr);
printf("\n %s \n", rendered);
free(rendered);
cJSON_Delete(arr);
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对象嵌套对象
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| SetConsoleOutputCP(65001);
cJSON* obj = cJSON_CreateObject();
cJSON* nameVal = cJSON_CreateString("马鞍斯");
cJSON* ageVal = cJSON_CreateNumber(10);
cJSON_AddItemToObject(obj, "name", nameVal);
cJSON_AddItemToObject(obj, "age", ageVal);
cJSON* car = cJSON_CreateObject();
cJSON* colorVal = cJSON_CreateString("黑色");
cJSON* modelVal = cJSON_CreateString("一汽大众");
cJSON_AddItemToObject(car, "color", colorVal);
cJSON_AddItemToObject(car, "model", modelVal);
cJSON_AddItemToObject(obj, "car", car);
char* rendered = cJSON_Print(obj);
printf("\n %s \n", rendered);
free(rendered);
cJSON_Delete(obj);
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对象嵌套数组
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| SetConsoleOutputCP(65001);
cJSON* obj = cJSON_CreateObject();
cJSON* nameVal = cJSON_CreateString("马鞍斯");
cJSON* ageVal = cJSON_CreateNumber(10);
cJSON_AddItemToObject(obj, "name", nameVal);
cJSON_AddItemToObject(obj, "age", ageVal);
cJSON* arr = cJSON_CreateArray();
cJSON* car = cJSON_CreateObject();
cJSON* colorVal = cJSON_CreateString("黑色");
cJSON* modelVal = cJSON_CreateString("一汽大众");
cJSON_AddItemToObject(car, "color", colorVal);
cJSON_AddItemToObject(car, "model", modelVal);
cJSON_AddItemToObject(arr, "car", car);
cJSON* car2 = cJSON_CreateObject();
cJSON* colorVal2 = cJSON_CreateString("白色");
cJSON* modelVal2 = cJSON_CreateString("上海大众");
cJSON_AddItemToObject(car2, "color", colorVal2);
cJSON_AddItemToObject(car2, "model", modelVal2);
cJSON_AddItemToObject(arr, "car", car2);
cJSON_AddItemToObject(obj, "cars", arr);
char* rendered = cJSON_Print(obj);
printf("\n %s \n", rendered);
free(rendered);
cJSON_Delete(obj);
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解析json字符串
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| {
"name":"张柳",
"age":50,
"address":"浙江苏州",
"cars":[
{
"color":"黑色",
"brand":"上海大众"
},
{
"color":"白色",
"brand":"特拉斯"
}
]
}
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| SetConsoleOutputCP(65001);
char * jsonStr = "{\"name\":\"张柳\",\"age\":50,\"address\":\"浙江苏州\",\"cars\":[{\"color\":\"黑色\",\"brand\":\"上海大众\"},{\"color\":\"白色\",\"brand\":\"特拉斯\"}]}";
cJSON* root = cJSON_Parse(jsonStr);
cJSON* name = cJSON_GetObjectItem(root, "name");
cJSON* age = cJSON_GetObjectItem(root, "age");
printf("name: %s\n",name->valuestring);
printf("age: %d\n", age->valueint);
//遍历json数组
cJSON* cars = cJSON_GetObjectItem(root,"cars");
for (int i = 0; i < cJSON_GetArraySize(cars); i++)
{
cJSON* item = cJSON_GetArrayItem(cars, i);
cJSON* color = cJSON_GetObjectItem(item, "color");
cJSON* brand = cJSON_GetObjectItem(item, "brand");
printf("color=%s,brand=%s\n", color->valuestring, brand->valuestring);
}
cJSON_Delete(root);
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