C++ 逐行读取文件但行类型为 CString 或 TCHAR

Question

我得到以下例子

    CString line[100];

    //string line;
    ifstream myfile (_T("example.txt"));
    if (myfile.is_open())
    {
       while ( getline (myfile,line) )
       {
          cout << line << '\n';
       }
       myfile.close();
     }

那“行”怎么能存入类型为CString或TCHAR的值。我收到这样的错误:

error C2664: '__thiscall std::basic_ifstream >::std::basic_ifstream >(const char *,int)'

请帮助我:)

Answer 1

首先声明:

CString line[100];

定义了一个包含 100 个 CString 的数组:你确定要那个吗？

或者您可能只希望一个 CString 将每一行读入？

// One line
CString line;

您可以选择将行读入 std::string，然后将结果转换为 CString:

string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
   while (getline(myfile, line))
   {
      // Convert from std::string to CString.
      //
      // Note that there is no CString constructor overload that takes
      // a std::string directly; however, there are CString constructor
      // overloads that take raw C-string pointers (e.g. const char*).
      // So, it's possible to do the conversion requesting a raw const char*
      // C-style string pointer from std::string, calling its c_str() method.
      // 
      CString str(line.c_str());

      cout << str.GetString() << '\n';
   }
   myfile.close();
}