读取整个ASCII文件到c++ std::字符串

我需要将整个文件读入内存，并将其放在c++ std::string中。

如果我要将它读入char[]，答案将非常简单:

std::ifstream t;
int length;
t.open("file.txt");      // open input file
t.seekg(0, std::ios::end);    // go to the end
length = t.tellg();           // report location (this is the length)
t.seekg(0, std::ios::beg);    // go back to the beginning
buffer = new char[length];    // allocate memory for a buffer of appropriate dimension
t.read(buffer, length);       // read the whole file into the buffer
t.close();                    // close file handle

// ... Do stuff with buffer here ...

现在，我想做完全相同的事情，但使用std::string而不是char[]。我想避免循环，即我不想:

std::ifstream t;
t.open("file.txt");
std::string buffer;
std::string line;
while(t){
std::getline(t, line);
// ... Append line to buffer and go on
}
t.close()

什么好主意吗?

当前回答

如果你碰巧使用glibmm，你可以尝试Glib::file_get_contents。

#include <iostream>
#include <glibmm.h>

int main() {
    auto filename = "my-file.txt";
    try {
        std::string contents = Glib::file_get_contents(filename);
        std::cout << "File data:\n" << contents << std::endl;
    catch (const Glib::FileError& e) {
        std::cout << "Oops, an error occurred:\n" << e.what() << std::endl;
    }

    return 0;
}

2016-08-07 14:55:31

其他回答

你可能在任何书籍或网站上都找不到这个，但我发现它非常有效:

#include <fstream>
// ...
std::string file_content;
std::getline(std::ifstream("filename.txt"), file_content, '\0');

2015-11-10 16:48:09

我想出了另一种方法，适用于大多数istreams，包括std::cin!

std::string readFile()
{
    stringstream str;
    ifstream stream("Hello_World.txt");
    if(stream.is_open())
    {
        while(stream.peek() != EOF)
        {
            str << (char) stream.get();
        }
        stream.close();
        return str.str();
    }
}

2014-08-20 05:23:40

试试下面两种方法中的一种:

string get_file_string(){
    std::ifstream ifs("path_to_file");
    return string((std::istreambuf_iterator<char>(ifs)),
                  (std::istreambuf_iterator<char>()));
}

string get_file_string2(){
    ifstream inFile;
    inFile.open("path_to_file");//open the input file

    stringstream strStream;
    strStream << inFile.rdbuf();//read the file
    return strStream.str();//str holds the content of the file
}

2015-02-05 12:50:38

我认为最好的方法是使用字符串流。简单快捷!!

#include <fstream>
#include <iostream>
#include <sstream> //std::stringstream
int main() {
    std::ifstream inFile;
    inFile.open("inFileName"); //open the input file

    std::stringstream strStream;
    strStream << inFile.rdbuf(); //read the file
    std::string str = strStream.str(); //str holds the content of the file

    std::cout << str << "\n"; //you can do anything with the string!!!
}

2013-11-12 06:08:42

我可以这样做:

void readfile(const std::string &filepath,std::string &buffer){
    std::ifstream fin(filepath.c_str());
    getline(fin, buffer, char(-1));
    fin.close();
}

如果这是不受欢迎的，请告诉我原因

2012-10-22 12:55:00

读取整个ASCII文件到c++ std::字符串

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