[英]C++ std::vector to JSON Array with rapidjson
I am trying to parse a basic std::vector of strings to json using the rapidjson library. 我正在尝试使用RapidJSON库将基本的std :: vector字符串解析为json。
Even though there are multiple answers to this question online, none of it worked for me. 即使此问题在线上有多个答案,也没有一个对我有用。 The best I could find was this , but I do get an error (cleaned up a bit):
我能找到的最好的是this ,但是我确实得到了一个错误(清理了一下):
Error C2664 'noexcept': cannot convert argument 1 from 'std::basic_string,std::allocator>' to 'rapidjson::GenericObject,rapidjson::MemoryPoolAllocator>>'
错误C2664'noexcept':无法将参数1从'std :: basic_string,std :: allocator>'转换为'rapidjson :: GenericObject,rapidjson :: MemoryPoolAllocator >>'
My code is mostly based on the link above: 我的代码主要基于上面的链接:
rapidjson::Document d;
std::vector<std::string> files;
// The Vector gets filled with filenames,
// I debugged this and it works without errors.
for (const auto & entry : fs::directory_iterator(UPLOAD_DIR))
files.push_back(entry.path().string());
// This part is based on the link provided
d.SetArray();
rapidjson::Document::AllocatorType& allocator = d.GetAllocator();
for (int i = 0; i < files.size(); i++) {
d.PushBack(files.at(i), allocator);
}
rapidjson::StringBuffer strbuf;
rapidjson::Writer<rapidjson::StringBuffer> writer(strbuf);
d.Accept(writer);
jsonString = strbuf.GetString();
It would be nice if someone could explain what I am missing here, as I do not fully understand the error showing up. 如果有人可以解释我在这里缺少的内容,那就太好了,因为我不完全理解出现的错误。 I guess it has to do something with the provided string types, but the error is generated in a Rapidjson file..
我猜想它必须对提供的字符串类型做些什么,但是错误是在Rapidjson文件中生成的。
I also would appreciate if there were other working examples you could provide. 如果您还可以提供其他工作示例,我也将不胜感激。
Thanks in advance! 提前致谢!
EDIT With JSON Array I mean just a basic json string containing the values of the vector. 使用JSON数组进行编辑,我的意思是仅包含向量值的基本json字符串。
Seems that the string type std::string and rapidjson::UTF8 are not compatible. 似乎字符串类型std :: string和Rapidjson :: UTF8不兼容。 I set up a small test program, and it seems to work if you create a rapidjson::Value object and call it SetString method first.
我建立了一个小型测试程序,如果您创建了一个Rapidjson :: Value对象并首先将其命名为SetString方法,它似乎可以工作。
#include <iostream>
#include <vector>
#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
int main() {
rapidjson::Document document;
document.SetArray();
std::vector<std::string> files = {"abc", "def"};
rapidjson::Document::AllocatorType& allocator = document.GetAllocator();
for (const auto file : files) {
rapidjson::Value value;
value.SetString(file.c_str(), file.length(), allocator);
document.PushBack(value, allocator);
// Or as one liner:
// document.PushBack(rapidjson::Value().SetString(file.c_str(), file.length(), allocator), allocator);
}
rapidjson::StringBuffer strbuf;
rapidjson::Writer<rapidjson::StringBuffer> writer(strbuf);
document.Accept(writer);
std::cout << strbuf.GetString();
return 0;
}
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