Question

我一直在研究文件阅读器，它从文件内部读取数据并将其存储在字符串中。我的代码编译时我应该如何硬编码要打开的文件名，但是当我尝试从键盘读取文件时，我得到错误＆＃34;没有已知的转换参数1从str到const和I不知道为什么。继承我的代码：

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

int main() {

 string fileName;
 cout << "Enter the file name to be read: ";
 cin >> fileName;
 ifstream input_file(fileName);
 std::string line_; // string which text file contents will be stored in

 if(input_file.is_open()){ // validation to see if the file is open
   while(getline(input_file, line_)){
     std::cout<<line_<< '\n'; //prints the contents of the file into the console
   }
  input_file.close();
 }
 else {
   std::cout<<"File is not open"<< '\n';
 }
 std::cin.get();
}

Answer 1

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


int main() {

 std::string fileName;
 std::cout << "Enter the file name to be read: ";
 std::cin >> fileName;
 std::ifstream input_file(fileName.c_str());
 std::string line_; // string which text file contents will be stored in

 if(input_file.is_open()){ // validation to see if the file is open
   while(getline(input_file, line_)){
     std::cout<<line_<< '\n'; //prints the contents of the file into the console
   }
  input_file.close();
 }
 else {
   std::cout<<"File is not open"<< '\n';
 }
 std::cin.get();
}

祝你好运......

Answer 2

可能不会将字符串作为参数的旧编译器。使用cstring：

 <form data-bind="submit: addMessage">
    <input type="text" data-bind='textInput: currentMessage().content' />
    <button id="ButtonSendMessage" type="submit">Send</button>
</form>

或者在命令行上指定ifstream input_file(fileName.c_str());以获得C ++ 11支持。

C ++没有已知的参数1转换 - 从文件读取

2 个答案: