C++如何新建文件夹

在C++中，直接操作操作系统级别的文件和目录功能通常需要使用系统的API或库函数，如Windows API（CreateDirectory）或POSIX标准下的mkdir函数。以下是一个在Windows系统上创建新文件夹的基本示例，使用了C++ Win32 API：

#include <windows.h>
#include <iostream>

bool createFolder(const std::wstring& path) {
    DWORD result = CreateDirectory(path.c_str(), NULL);
    if (result == 0 && GetLastError() != ERROR_ALREADY_EXISTS) {
        std::wcout << L"Failed to create directory. Error code: " << GetLastError() << std::endl;
        return false;
    }
    return true;
}

int main() {
    std::wstring folderPath(L"C:\\NewFolder");
    if (!createFolder(folderPath)) {
        std::wcout << L"Failed to create the folder." << std::endl;
    } else {
        std::wcout << L"Successfully created the folder." << std::endl;
    }
    return 0;
}

对于Linux或Unix-like系统，可以使用`boost/filesystem`库或者C++17引入的`std::filesystem`库：

#include <boost/filesystem.hpp> // 或 #include <filesystem>
using namespace boost::filesystem; // 或 std

void createFolder(const std::string& path) {
    try {
        create_directory(path);
        std::cout << "Successfully created the folder: " << path << std::endl;
    } catch (const filesystem_error &e) {
        std::cerr << "Failed to create the folder. Reason: " << e.what() << std::endl;
    }
}

int main() {
    std::string folderPath = "/home/user/NewFolder";
    createFolder(folderPath);
    return 0;
}