C++中获取当前路径

在C++中，获取当前路径的方法有多种，具体取决于你所使用的平台和编程环境。以下是一些常见的方法：

1. **使用 `<filesystem>` 库（C++17及更高版本）**:

    #include <iostream>
    #include <filesystem>

    namespace fs = std::filesystem;

    int main() {
        fs::path current_path = fs::current_path();
        std::cout << "Current path: " << current_path << std::endl;
        return 0;
    }

2. **使用 `getcwd` 函数（POSIX标准）**:

    #include <iostream>
    #include <unistd.h>

    int main() {
        char buffer[FILENAME_MAX];
        if (getcwd(buffer, sizeof(buffer)) != nullptr) {
            std::cout << "Current path: " << buffer << std::endl;
        } else {
            perror("getcwd() error");
        }
        return 0;
    }

3. **在Windows上使用 `GetCurrentDirectory` 函数**:

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

    int main() {
        char buffer[MAX_PATH];
        if (GetCurrentDirectory(sizeof(buffer), buffer) != 0) {
            std::cout << "Current path: " << buffer << std::endl;
        } else {
            std::cerr << "GetCurrentDirectory() error: " << GetLastError() << std::endl;
        }
        return 0;
    }

4. **通过命令行参数获取执行路径**:

    #include <iostream>

    int main(int argc, char* argv[]) {
        if (argc > 0) {
            std::cout << "Executable path: " << (argv[0]) << std::endl;
        }
        return 0;
    }

5. **使用Boost库的 `boost::filesystem`**:

    #include <iostream>
    #include <boost/filesystem.hpp>

    namespace fs = boost::filesystem;

    int main() {
        fs::path current_path = fs::current_path();
        std::cout << "Current path: " << current_path << std::endl;
        return 0;
    }