c++接受"payloadItem":{"routePath":[[{"jobModel":0,"kappa":0.0,"relativeTime":0.0,"s":0.0,"theta":0.0059195678241804259,"v":2.7777777777777777,"x":547630.32539420552,"y":4254112.6222481178},{"jobModel":0,"kappa":0.0,"relativeTime":0.10000000000000001,"s":0.27777777777777779,"theta":0.0059195678241804259,"v":2.7777777777777777,"x":547630.60316711641,"y":4254112.623892433}],[{"jobModel":0,"kappa":0.0,"relativeTime":0.0,"s":0.0,"theta":0.0059195678241804259,"v":2.7777777777777777,"x":547630.32539420552,"y":4254112.6222481178},{"jobModel":0,"kappa":0.0,"relativeTime":0.10000000000000001,"s":0.27777777777777779,"theta":0.0059195678241804259,"v":2.7777777777777777,"x":547630.60316711641,"y":4254112.623892433}]]}这种数据需要怎么处理,用cjson库
时间: 2023-08-09 21:10:55 浏览: 59
在C++中,您可以使用第三方库如`jsoncpp`来处理JSON数据。以下是一个使用`jsoncpp`库解析和访问您提供的JSON数据的示例代码:
```cpp
#include <iostream>
#include <json/json.h>
int main() {
// 假设您的JSON数据存储在一个字符串中
std::string jsonStr = "{\"payloadItem\":{\"routePath\":[[{\"jobModel\":0,\"kappa\":0.0,\"relativeTime\":0.0,\"s\":0.0,\"theta\":0.0059195678241804259,\"v\":2.7777777777777777,\"x\":547630.32539420552,\"y\":4254112.6222481178},{\"jobModel\":0,\"kappa\":0.0,\"relativeTime\":0.10000000000000001,\"s\":0.27777777777777779,\"theta\":0.0059195678241804259,\"v\":2.7777777777777777,\"x\":547630.60316711641,\"y\":4254112.623892433}],[{\"jobModel\":0,\"kappa\":0.0,\"relativeTime\":0.0,\"s\":0.0,\"theta\":0.0059195678241804259,\"v\":2.7777777777777777,\"x\":547630.32539420552,\"y\":4254112.6222481178},{\"jobModel\":0,\"kappa\":0.0,\"relativeTime\":0.10000000000000001,\"s\":0.27777777777777779,\"theta\":0.0059195678241804259,\"v\":2.7777777777777777,\"x\":547630.60316711641,\"y\":4254112.623892433}]]}}";
Json::CharReaderBuilder reader;
Json::Value root;
std::string errs;
// 解析JSON字符串
std::istringstream jsonStream(jsonStr);
bool parsingSuccessful = Json::parseFromStream(reader, jsonStream, &root, &errs);
if (!parsingSuccessful) {
std::cout << "Failed to parse JSON: " << errs << std::endl;
return 1;
}
// 访问JSON中的数据
Json::Value payloadItem = root["payloadItem"];
Json::Value routePath = payloadItem["routePath"];
// 遍历二维数组
for (const auto& row : routePath) {
for (const auto& item : row) {
int jobModel = item["jobModel"].asInt();
double kappa = item["kappa"].asDouble();
double relativeTime = item["relativeTime"].asDouble();
double s = item["s"].asDouble();
double theta = item["theta"].asDouble();
double v = item["v"].asDouble();
double x = item["x"].asDouble();
double y = item["y"].asDouble();
// 按需使用解析出的数据
// ...
std::cout << "jobModel: " << jobModel << std::endl;
std::cout << "kappa: " << kappa << std::endl;
std::cout << "relativeTime: " << relativeTime << std::endl;
std::cout << "s: " << s << std::endl;
std::cout << "theta: " << theta << std::endl;
std::cout << "v: " << v << std::endl;
std::cout << "x: " << x << std::endl;
std::cout << "y: " << y << std::endl;
}
}
return 0;
}
```
在上述代码中,我们使用`jsoncpp`库的`Json::Value`类来表示JSON数据,并使用`Json::CharReaderBuilder`类来解析JSON字符串。通过访问`payloadItem`和`routePath`字段,我们可以遍历二维数组并获取其中的数据。
请注意,您需要在编译和链接时将`jsoncpp`库正确地包含到您的项目中。具体的步骤可能因您所使用的编译环境而有所不同。