c++ - while 循环不输出子字符串的下一个实例

Question

我有以下代码

#include <iostream>
#include <fstream>
#include <string>

int main(){
    std::string file = "words.txt";
    std::string word;
    std::ifstream inFile;
    std::string delimiter = ",";
    inFile.open(file);
    if (!inFile){
        std::cerr << "File not opened." << std::endl;
    }
    while (getline(inFile, word)){
        std::cout << word.substr(0, word.find(delimiter)) << " ";
        word.erase(0, word.find(delimiter) + delimiter.length());
    }
    inFile.close();
    std::cin.get();
}

这个循环有问题:

    while (getline(inFile, word)){
        std::cout << word.substr(0, word.find(delimiter)) << " ";
        word.erase(0, word.find(delimiter) + delimiter.length());
    }

我收到的唯一输出是 "word1" 形式的第一个子字符串在输出中。

我输入了 std::cout << word.substr(0, word.find(delimiter))在删除函数之后的行中确定单词是否仍然有字符，确实如此。 word是一个很长的字符串，格式为 "word1","word2","word3",...,"lastword"我的分隔符是 "," .

Answer 1

作为@Joseph Mansfield评论里说。您正在遍历文件行而不是其中的单词。

要按, 拆分单词，您可以简单地使用定界符作为getline 的第三个输入。

#include <iostream>
#include <fstream>
#include <string>

int main(){
    std::string file = "words.txt";
    std::string word;
    std::ifstream inFile;
    char delimiter = ',';
    inFile.open(file);
    if (!inFile){
        std::cerr << "File not opened." << std::endl;
    }
    while (getline(inFile, word,delimiter)){
        std::cout << word << " ";
    }
    inFile.close();
    std::cin.get();
}

阅读多行:

std::string line;
while (getline(inFile, line)){
    std::stringstream stream(line); 
    while (getline(stream, word, delimiter)){
        std::cout << word << " ";
    }
}