rapidjson：从文件中读取文档的工作代码？ [英] rapidjson: working code for reading document from file?

问题描述

我需要一个有效的c ++代码，以便使用rapidjson从文件中读取文档： https://code.google .com / p / rapidjson /

I need a working c++ code for reading document from file using rapidjson: https://code.google.com/p/rapidjson/

在维基中它还没有文档，例子只是从std :: string开始序列化，我没有深入的知识的模板。

In the wiki it's yet undocumented, the examples unserialize only from std::string, I haven't a deep knowledge of templates.

我将我的文档序列化成一个文本文件，这是我写的代码，但它不
compile：

I serialized my document into a text file and this is the code I wrote, but it doesn't compile:

#include "rapidjson/prettywriter.h" // for stringify JSON
#include "rapidjson/writer.h"   // for stringify JSON
#include "rapidjson/filestream.h"   // wrapper of C stream for prettywriter as output
[...]
std::ifstream myfile ("c:\\statdata.txt");
rapidjson::Document document;
document.ParseStream<0>(myfile);

编译错误状态：错误：'Document'不是'rapidjson'的成员

the compilation error state: error: 'Document' is not a member of 'rapidjson'

我使用Qt 4.8.1与mingw和rapidjson v 0.1（我已经尝试与升级v 0.11，但错误仍然）

I'm using Qt 4.8.1 with mingw and rapidjson v 0.1 (I already try with upgraded v 0.11 but the error remain)

推荐答案

<@ c $ c> FileStream 在@ Raanan的答案显然已弃用。在源代码中有一个注释，改为使用 FileReadStream 。

The FileStream in @Raanan's answer is apparently deprecated. There's a comment in the source code that says to use FileReadStream instead.

#include <rapidjson/document.h>
#include <rapidjson/filereadstream.h>

using namespace rapidjson;

// ...

FILE* pFile = fopen(fileName.c_str(), "rb");
char buffer[65536];
FileReadStream is(pFile, buffer, sizeof(buffer));
Document document;
document.ParseStream<0, UTF8<>, FileReadStream>(is);

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