libcurl库nmake编译方案以及完整使用封装与测试ftp

编译过程请参照《libcurl库nmake编译方案》，下面是主要步骤简单摘抄与修改。

如果你不方便从github上下载，这里有https://autumoon.lanzoub.com/im40i36zznra

1. 找到x64 Native Tools Command Prompt for VS 2022 (本人使用的是VS2022)

C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Visual Studio 2022\Visual Studio Tools\VC

2. 运行x64 Native Tools Command Prompt for VS 2022

3. 输入命令nmake.exe /f Makefile.vc MODE=dll DEBUG=no MACHINE=x64 GEN_PDB=no WINBUILD_ACKNOWLEDGE_DEPRECATED=yes  即可编译x64位的release库

4. 生成成果物在curl-8.16.0\builds\libcurl-vc-x64-release-dll-ipv6-sspi-schannel 下

下面直接提供封装类与测试类。

#pragma once

#include <string>
#include <vector>
#include <functional>
#include <memory>
#include <filesystem>

// Include curl header directly to avoid type conflicts
#include <curl/curl.h>

namespace qycommon
{
    // FTP listing item (moved to namespace scope)
    struct RemoteEntry
    {
        std::string name;
        bool is_dir = false;
    };

    class CLibCurlUser
    {
    public:
        CLibCurlUser();
        ~CLibCurlUser();

        // Basic configuration
        void set_url(const std::string& url);
        void set_credentials(const std::string& user, const std::string& pwd); // empty for anonymous
        void set_connect_timeout(long seconds); // connect timeout
        void set_transfer_timeout(long seconds); // transfer timeout (overall)
        void set_passive(bool enable); // FTP passive/active
        void set_verbose(bool enable); // internal debug only, no stdout/stderr

        // Error info
        const std::string& last_error() const;

        // File operations
        bool upload_file(const std::string& local_path, const std::string& remote_url);
        bool download_file(const std::string& remote_url, const std::string& local_path);

        // Directory operations (recursive)
        bool upload_directory(const std::string& local_dir, const std::string& remote_base_url);
        bool download_directory(const std::string& remote_base_url, const std::string& local_dir);

    private:
        // Utils
        bool ensure_parent_directory_exists(const std::filesystem::path& filePath);
        bool create_local_directory(const std::filesystem::path& dirPath);

        // Remote directory ops
        bool remote_mkdir_recursive(const std::string& remote_dir_url);

        // FTP listing and parsing
        bool list_directory_mlsd(const std::string& remote_dir_url, std::vector<qycommon::RemoteEntry>& entries);
        bool list_directory_list(const std::string& remote_dir_url, std::vector<qycommon::RemoteEntry>& entries);

        // Error handling
        void set_error(const std::string& err);

        // Common curl options
        bool apply_common_opts(CURL* curl, const std::string& url);

        // URL helpers
        std::string url_join(const std::string& base, const std::string& name);
        std::string url_dirname(const std::string& url);
        std::string url_basename(const std::string& url);

    private:
        std::string m_baseUrl; // optional default url
        std::string m_user;
        std::string m_pwd;
        long m_connectTimeoutSec = 15;
        long m_transferTimeoutSec = 0; // 0 means unlimited
        bool m_passive = true;
        bool m_verbose = false;
        std::string m_lastError;
    };
}

#include "CLibCurlUser.h"

#include <curl/curl.h>
#include <cstdio>
#include <fstream>
#include <sstream>

namespace fs = std::filesystem;

namespace qycommon
{
    namespace
    {
        inline void trim(std::string& s)
        {
            auto is_space = [](unsigned char c) {
                return c == ' ' || c == '\t' || c == '\r' || c == '\n';
            };
            // trim left
            size_t i = 0;
            while (i < s.size() && is_space(static_cast<un