ofStream error: writing to text file?

Question

所以我有这个写入文本文件的函数，但我一直收到这个错误，我相信这与使用 ofstream 的输出语法有关。 有人可以帮我诊断一下吗？

谢谢，

艾文

int writeSave(string chName, string chSex, string chRace, 
              vector<int> chAttributes, int chLevel, int chStage)
{
    ofstream outputFile("saveFile.txt");
    outputFile << "chName: " << chName <<
                  "\nchSex: " << chSex <<
                  "\nchRace: " << chRace <<
                  "\nchAttributes: " << chAttributes <<
                  "\nchLevel: " << chLevel <<
                  "\nchStage: " << chStage;
    return 0;
}

运行 /home/ubuntu/workspace/saveGame/sgFunc.cpp

/home/ubuntu/workspace/saveGame/sgFunc.cpp: In function ‘int writeSave(std::string, std::string, std::string, std::vector<int>, int, int)’: /home/ubuntu/workspace/saveGame/sgFunc.cpp:27:44: error: cannot bind ‘std::basic_ostream<char>’ lvalue to ‘std::basic_ostream<char>&&’
                     "\nchRace: " << chRace <<
                                            ^

In file included from /usr/include/c++/4.8/iostream:39:0,
                 from /home/ubuntu/workspace/saveGame/sgFunc.cpp:1: /usr/include/c++/4.8/ostream:602:5: error:   initializing argument 1 of ‘std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::vector<int>]’
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^

Answer 1

std::vector<> 无法（默认情况下）流式传输到字符输出流，这正是您尝试使用 << chAttributes 进行的操作。您需要手动将其转换为字符串，或提供 operator<< 以将其流式传输到字符输出流。

一个选项，如果要写出内容comma-delimited（需要包含<iterator>和<algorithm>）：

outputFile << "chName: " << chName <<
              "\nchSex: " << chSex <<
              "\nchRace: " << chRace <<
              "\nchAttributes: ";

copy(chAttributes.begin(),
     chAttributes.end(),
     ostream_iterator<int>(outputFile, ","));

outputFile << "\nchLevel: " << chLevel <<
              "\nchStage: " << chStage;

---

我编写此示例代码时假定 using namespace std; 正如您的代码所显示的那样。我建议不要使用这一行，而是 std::- 限定你想从 std 命名空间使用的东西。