尝试将字符串传递给std :: ifstream作为参数 [英] Attempting to pass string to std::ifstream as argument

问题描述

我尝试使用从向量中检索的字符串将文件名传递给ifstream打开。

I'm attempting to use a string retrieved from a vector to pass a filename to ifstream for opening.

vector<string> files;

//Populate vector

std::ifstream ifile(files[0] ,std::ios::binary);

编译时返回：

：没有匹配的函数调用'std :: basic_ifstream> :: basic_ifstream（std :: basic_string，std :: allocator>& const std :: _Ios_Openmode&）*

error: no matching function for call to 'std::basic_ifstream >::basic_ifstream(std::basic_string, std::allocator >&, const std::_Ios_Openmode&)*

如果我尝试将文件[0]转换为const char *首先

If I attempt to convert files[0] to const char * first

vector<string> files;

std::string l = files[0];
const char *p;
p = l.c_str();
std::ifstream ifile(p ,std::ios::binary);

编译器返回：

'l'未在此范围内声明

error: 'l' was not declared in this scope

我在这里做错了什么？

What am I doing wrong here? It's something basic and glaring i'm sure.

推荐答案

尝试：

std::ifstream ifile(files[0].c_str(), std::ios::binary);

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