Question

好的，这是我尝试读取的文件的文本：

KEYS
a set of keys
3
LAMP
a brightly shining brass lamp
8


ROD
a black rod with a rusty star
12

好吧，假装每行的间距均匀，但是在8和ROD之间有2条空行（或制表符）。我该如何跳过并继续该程序？我正在尝试将每一行放入3个向量中（因此将键，灯和杆放入一个向量中，等等）。这是我的代码（但它不会跳过空白行）：

#include <string>
#include <iostream>
#include <sstream>
#include <vector>
#include <fstream>
using namespace std;

int main() {
    ifstream objFile;
    string inputName;
    string outputName;
    string header;
    cout << "Enter image file name: "; 
    cin >> inputName;
    objFile.open(inputName);
    string name;
    vector<string> name2;
    string description;
    vector<string> description2;
    string initialLocation;
    vector<string> initialLocation2;
    string line;


    if(objFile) {
        while(!objFile.eof()){
                getline(objFile, line);
                name = line;
                name2.push_back(name);
                getline(objFile, line);
                description = line;
                description2.push_back(description);
                getline(objFile, line);
                initialLocation = line;
                initialLocation2.push_back(initialLocation);

             } else {
        cout << "not working" << endl;
    }

    for (std::vector<string>::const_iterator i = name2.begin(); i != name2.end(); ++i)
       std::cout << *i << ' ';
   for (std::vector<string>::const_iterator i = description2.begin(); i != description2.end(); ++i)
       std::cout << *i << ' ';
    for (std::vector<string>::const_iterator i = initialLocation2.begin(); i != initialLocation2.end(); ++i)
        std::cout << *i << ' ';

Answer 1

您可以改用std::getline()（正如许多人所指出的那样）...，它将逐行显示每一行：

inline std::string ReadFile(std::ifstream& stream)
{
    std::string contents;
    std::string temporary;
    while (std::getline(stream, temporary))
        if (!std::all_of(temporary.begin(), temporary.end(), isspace))
            contents.append(temporary + "\n");
    return contents.substr(0, contents.size() - 1);
}

是的，示例：

int main()
{
    std::ifstream is("file.txt");
    if (is.fail())
        return 1;
    auto const contents = ReadFile(is);
    is.close();
    std::cout << contents << std::endl;
    std::cin.get();
    return 0;
}

Answer 2

我认为您可以通过std::getline检查字符串是否为空。如果是这样，那么您可以忽略它或类似的东西。

    getline(objFile, line);
    name = line; 
    while(name.length() == 0)
    {
         getline(objFile, line);
         name = line;
    }
    name = line;
    name2.push_back(name);

    getline(objFile, line);
    description= line; 
    while(description.length() == 0)
    {
         getline(objFile, line);
         description = line;
    }
    description= line;
    description2.push_back(description);

    getline(objFile, line);
    initialLocation = line; 
    while(initialLocation.length() == 0)
    {
         getline(objFile, line);
         initialLocation = line;
    }
    initialLocation = line;
    initialLocation2.push_back(initialLocation );

如果我是正确的，那么如果该行为空白，则该行将没有长度；如果是空白，我们将再次检查，因此将其忽略。

在C ++中读取文件时如何跳过空白行？

2 个答案: