rapidjson检测是否是一个正确的JSON输入

IsObject assert failed

使用未正确解析的JSON文件会报出如下错误

fail_parse_not_a_json: /usr/local/include/rapidjson/document.h:1359: rapidjson::GenericValue<Encoding, Allocator>::MemberIterator rapidjson::GenericValue<Encoding, Allocator>::FindMember(const rapidjson::GenericValue<Encoding, SourceAllocator>&) [with SourceAllocator = rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator>; Encoding = rapidjson::UTF8<>; Allocator = rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator>; rapidjson::GenericValue<Encoding, Allocator>::MemberIterator = rapidjson::GenericMemberIterator<false, rapidjson::UTF8<>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >]: Assertion `IsObject()' failed.

rapidjson检测是否是一个正确的JSON输入

参照官方文档建议使用 HasParseError 来检测parse的错误

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include <iostream>
 
using namespace rapidjson;
 
int main() {
    // 1. 把 JSON 解析至 DOM。这里不是一个有效地JSON字符串
    const char* json = "{\"msg\": {\"seq\":8E-J3 }}";
    Document d;

    if(d.Parse(json).HasParseError()){
        std::cout << "parse error found!" << std::endl;
    }
    if(!d.IsObject()){
        std::cout << "not a correct json format!" << std::endl;
        return 0;
    }
 
    // 2. 利用 DOM 作出修改。
    Value& s = d["stars"];
    s.SetInt(s.GetInt() + 1);
 
    // 3. 把 DOM 转换（stringify）成 JSON。
    StringBuffer buffer;
    Writer<StringBuffer> writer(buffer);
    d.Accept(writer);
 
    // Output {"project":"rapidjson","stars":11}
    std::cout << buffer.GetString() << std::endl;
    return 0;
}

输出是

feiyu@fly2rain:~/dev/repo/repo_for_test/build$ ./fail_parse_not_a_json 
parse error found!
not a correct json format!

引用:
rapidjson中文文档