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c及c++编译时候出现的一些问题与解决方案

admin 11月 13, 2020 0

字符串问题

[no matching function for call to ‘std::basic_ofstream >::basic_ofstream(std::string&)’]
编译时候报错为no matching function for call to std::basic_ofstream<char, std::char_traits >::basic_ofstream(std::string&)

原因是C++的string类与C的字符串存在不同，一些函数无法将string类作为参数使用。

std::ofstream can only be constructed with a std::string if you have C++11 or higher. Typically that is done with -std=c++11 (gcc, clang). If you do not have access to c++11 then you can use the c_str() function of std::string to pass a const char * to the ofstream constructor.

解决方案：转换为C的字符串

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char filename[10];
strcpy(filename, "1.txt");
ifstream fin;
fin.open(filename);

2.

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using namespace std;

int ()
{
string asegurado;
cout << "Nombre a agregar: ";
cin >> asegurado;

ofstream entrada(asegurado,"");
//ofstream entrada(asegurado); // C++11 or higher
//ofstream entrada(asegurado.c_str()); // C++03 or below
if (entrada.fail())
{
cout << "El archivo no se creo correctamente" << endl;
}
}