Question

当我尝试运行程序时出现此错误。可能是问题，因为代码是正确的，就我所见。

这是错误

std :: basic_fstream :: basic_fstream（std :: string＆amp;，const openmode＆amp;）＆＃39;

以下是代码

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

int main()
{
string fileName;
int frequencyArray[26];
char character;

for (int i = 0; i < 26; i++)
    frequencyArray[i] = 0;

cout << "Please enter the name of file: ";
getline(cin, fileName);

fstream inFile(fileName, fstream::in);  // to read the file

if (inFile.is_open())
{
    while (inFile >> noskipws >> character)
    {
        // if alphabet
        if (isalpha(character))
        {
            frequencyArray[(int)toupper(character) - 65]++;
        }
    }

    inFile.close();

    cout << "Letter frequencies are as: " << endl;
    for (int i = 0; i < 26; i++)
    {
        cout << (char)(i + 65) << " = " << frequencyArray[i] << endl;
    }
}
else
{
    cout << "Invalid File. Exiting...";
}


return 0;
}

Answer 1

你可以改变

到

fstream inFile(fileName, fstream::in);

Answer 2

虽然C ++ 11定义了一个std::fstream构造函数，它接受std::string作为输入，但Microsoft的std::fstream实现显然没有：

https://msdn.microsoft.com/en-us/library/a33ahe62.aspx#basic_fstream__basic_fstream

您必须使用std::string::c_str()方法传递文件名：

fstream inFile(fileName.c_str(), fstream::in);

话虽如此，请考虑改为使用std::ifstream：

ifstream inFile(fileName.c_str());

C ++ ifstream错误使用字符串作为打开文件路径

2 个答案: