从txt文件中读取出json格式的文本，用jsoncpp解析

一、读取文本文件

方法1：

#include 
    
          // std::cout#include 
     
            // std::ifstream
     
    

std::ifstream is ("test.txt", std::ifstream::binary);  if (is) {    // get length of file:    is.seekg (0, is.end);    int length = is.tellg();    is.seekg (0, is.beg);    char * buffer = new char [length];    std::cout << "Reading " << length << " characters... ";    // read data as a block:    is.read (buffer,length);    if (is)      std::cout << "all characters read successfully.";    else      std::cout << "error: only " << is.gcount() << " could be read";    is.close();    // ...buffer contains the entire file...    delete[] buffer; 上面的代码将txt文本读到了buffer中， 代码来自：istream::read - C++ Reference  http://www.cplusplus.com/reference/istream/istream/read/ delete buffer之前，用jsoncpp转成json：

Json::Reader reader;

Json::Value root;

bool parsingSuccessful = reader.parse(buffer, root );

然后可以参考上篇Jsoncpp学习中的方法进行解析

 

二、 读取文本文件

string slocal_path = "e:\\temp\\wxxs001.txt";

std::ifstream is (slocal_path.c_str(), std::ifstream::binary);

if (!is)

{

return 0;

}

//读取"utf8.txt"

//in.open("utf8.txt");

//过滤文本开始efbbbf三个字节

//char b;

//is>>b;

//is>>b;

//is>>b;

 

//注：上面过滤文本文件开始的三个字节，实际应用中发现有时候不用过滤，过滤反而出错，有时候却必须要过滤一下。

string strUtf8;

is>>strUtf8;

is.close();

//cout<<Utf8ToGbk(strUtf8)<<endl;//转成gbk输出

//转换成json

Json::Reader reader;

Json::Value root;

bool parsingSuccessful = reader.parse(strUtf8, root );