libcurl实现GET与POST请求(Win32, C++)

原创已于 2024-03-29 11:43:12 修改 · 523 阅读

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#c++ #开发语言 #C++ #Win32 #Windows #libcurl

于 2024-03-29 11:42:36 首次发布

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文章介绍了CCurlRequest类，用于发送GET和POST请求，包括初始化、配置CURL选项、设置头部、处理响应以及进度回调。它使用CURL库进行网络通信，展示了如何使用C++实现简单的HTTP请求操作。

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CCurlRequest.h

#pragma once
#include <string>
#include "curl/include/curl/curl.h"
#include <windows.h>

typedef struct _CURL_XFER_PROGRESS
{
    curl_off_t dlNow;
    curl_off_t dlTotal;
    curl_off_t ulNow;
    curl_off_t ulTotal;

    _CURL_XFER_PROGRESS()
    {
        ZeroMemory(this, sizeof(*this));
    }

}CURL_XFER_PROGRESS;

class CCurlRequest
{
public:

    CCurlRequest();
    ~CCurlRequest();
    bool Get(std::string strUrl, 
        std::string& strResponse,
        std::string strHeader = "Content-Type:application/json;charset=UTF-8"
    );

    bool Post(std::string strUrl, 
        std::string& strResponse, 
        const std::string& strParam, 
        std::string strHeader = "Content-Type:application/json;charset=UTF-8"
    );

private:
    bool _Initialize();
    void _Uninitialize();
    void _ResetProgress();

    static size_t _WriteFunc(
        void* pBuffer, 
        size_t size, 
        size_t nmemb, 
        void* pUserData
    );

    static int _ProgressFunc(
        void* pUserData, 
        curl_off_t dlTotal, 
        curl_off_t dlNow, 
        curl_off_t ulTotal, 
        curl_off_t ulNow
    );

private:

    CURL* m_pCurl;
    std::string m_strResponse;
    CURL_XFER_PROGRESS m_dataProgress;
};

CCurlRequest.cpp

#include "CCurlRequest.h"

CCurlRequest::CCurlRequest()
    :
    m_pCurl(nullptr)
{
    _Initialize();
}

CCurlRequest::~CCurlRequest()
{
    _Uninitialize();
}

bool CCurlRequest::_Initialize()
{
    if (nullptr != m_pCurl)
    {
        return true;
    }

    m_pCurl = curl_easy_init();
    if (nullptr == m_pCurl)
    {
        return false;
    }

    curl_easy_setopt(m_pCurl, CURLOPT_WRITEFUNCTION, _WriteFunc);               // 设置写入回调
    curl_easy_setopt(m_pCurl, CURLOPT_WRITEDATA, static_cast<void*>(this));     // 设置写入回调参数
    curl_easy_setopt(m_pCurl, CURLOPT_NOPROGRESS, 0L);                          // 设置进度回调
    curl_easy_setopt(m_pCurl, CURLOPT_XFERINFOFUNCTION, _ProgressFunc);         // 设置进度回调
    curl_easy_setopt(m_pCurl, CURLOPT_XFERINFODATA, static_cast<void*>(this));  // 设置进度回调参数
    curl_easy_setopt(m_pCurl, CURLOPT_NOSIGNAL, 1L);                            // 指示 libcurl 不要使用任何信号/警报处理程序，即使在使用超时时时也是如此
    curl_easy_setopt(m_pCurl, CURLOPT_LOW_SPEED_LIMIT, 1L);                     // 设置低速限制
    curl_easy_setopt(m_pCurl, CURLOPT_LOW_SPEED_TIME, 1L);                      // 设置低速时间
    curl_easy_setopt(m_pCurl, CURLOPT_CONNECTTIMEOUT, 60);                      // 设置连接超时秒数
    curl_easy_setopt(m_pCurl, CURLOPT_TIMEOUT, 60000);                          // 设置读取操作超时秒数
    curl_easy_setopt(m_pCurl, CURLOPT_SSL_VERIFYPEER, 0L);                      // 设置我们是否应该在 ssl 握手中验证对等体
    curl_easy_setopt(m_pCurl, CURLOPT_SSL_VERIFYHOST, 0L);                      // 设置我们是否应该从 ssl 中的对等证书中验证公用名
    curl_easy_setopt(m_pCurl, CURLOPT_FOLLOWLOCATION, 1L);                      // 设置重定向
    curl_easy_setopt(m_pCurl, CURLOPT_VERBOSE, 0L);                             // 设置是否打印 libcurl 执行过程

    return true;
}

void CCurlRequest::_Uninitialize()
{
    if (nullptr != m_pCurl)
    {
        curl_easy_cleanup(m_pCurl);
        m_pCurl = nullptr;
    }
}

void CCurlRequest::_ResetProgress()
{
    m_dataProgress.dlNow = -1;
    m_dataProgress.dlTotal = -1;
    m_dataProgress.ulNow = -1;
    m_dataProgress.ulTotal = -1;
}

size_t CCurlRequest::_WriteFunc(
    void* pBuffer, 
    size_t size, 
    size_t nmemb, 
    void* pUserData
)
{
    size_t realsize = size * nmemb;
    if (NULL == pBuffer || NULL == pUserData)
    {
        return realsize;
    }

    CCurlRequest* pThis = static_cast<CCurlRequest*>(pUserData);
    pThis->m_strResponse += std::string((const char*)pBuffer, realsize);

    return realsize;
}

int CCurlRequest::_ProgressFunc(
    void* pUserData, 
    curl_off_t dlTotal, 
    curl_off_t dlNow, 
    curl_off_t ulTotal, 
    curl_off_t ulNow
)
{
    UNREFERENCED_PARAMETER(dlTotal);
    UNREFERENCED_PARAMETER(dlNow);
    UNREFERENCED_PARAMETER(ulTotal);
    UNREFERENCED_PARAMETER(ulNow);

    // 执行默认的进度函数
    //return CURL_PROGRESSFUNC_CONTINUE;

    CCurlRequest* pThis = static_cast<CCurlRequest*>(pUserData);

    CURL_XFER_PROGRESS info;
    info.dlNow = dlNow;
    info.dlTotal = dlTotal;
    info.ulNow = ulNow;
    info.ulTotal = ulTotal;

    //下载进度记录, 有变化时更新打印
    if (0 != memcmp(&info, &pThis->m_dataProgress, sizeof(CURL_XFER_PROGRESS)))
    {
        //printf("Download: %lld / %lld  Upload: %lld / %lld\n", dlNow, dlTotal, ulNow, ulTotal);
        pThis->m_dataProgress = info;
    }

    return CURLE_OK;
}

bool CCurlRequest::Get(
    std::string strUrl, 
    std::string& strResponse,
    std::string strHeader/* = "Content-Type:application/json;charset=UTF-8"*/
)
{
    CURLcode curlCode = CURLE_OK;
    if (nullptr == m_pCurl)
    {
        return false;
    }

    _ResetProgress();// 重置传输进度

    curl_slist* slist = curl_slist_append(NULL, strHeader.c_str());     // 添加头

    curl_easy_setopt(m_pCurl, CURLOPT_URL, strUrl.c_str());             // 设置链接URL
    curl_easy_setopt(m_pCurl, CURLOPT_POST, 0L);                        // 设置为提交数据
    curl_easy_setopt(m_pCurl, CURLOPT_HTTPHEADER, slist);               // 设置头

    curlCode = curl_easy_perform(m_pCurl);
    curl_slist_free_all(slist);
    strResponse = std::move(m_strResponse);
    return CURLE_OK == curlCode;
}

bool CCurlRequest::Post(
    std::string strUrl, 
    std::string& strResponse, 
    const std::string& strParam, 
    std::string strHeader/* = "Content-Type:application/json;charset=UTF-8"*/)
{
    CURLcode curlCode = CURLE_OK;
    if (nullptr == m_pCurl)
    {
        return false;
    }

    _ResetProgress();// 重置传输进度

    curl_slist* slist = curl_slist_append(NULL, strHeader.c_str());     // 添加头

    curl_easy_setopt(m_pCurl, CURLOPT_URL, strUrl.c_str());             // 设置链接URL
    curl_easy_setopt(m_pCurl, CURLOPT_POSTFIELDS, strParam.c_str());    // 设置body
    curl_easy_setopt(m_pCurl, CURLOPT_POSTFIELDSIZE, strParam.size());  // 设置body长度
    curl_easy_setopt(m_pCurl, CURLOPT_POST, 1L);                        // 设置为提交数据
    curl_easy_setopt(m_pCurl, CURLOPT_HTTPHEADER, slist);               // 设置头

    curlCode = curl_easy_perform(m_pCurl);
    curl_slist_free_all(slist);
    strResponse = std::move(m_strResponse);
    return CURLE_OK == curlCode;
}

main.cpp

// CurlDownload.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>
#include <tchar.h>
#include "CCurlDownloadMgr.h"
#include "ThreadPool.h"
#include "CCurlRequest.h"
#include "CStrUtils.h"
#include "CTimeUtils.h"

#define GET_URL1  R"(https://gitee.com/flame_cyclone/fcassistant-binary/releases/download/1.0.1.15/LuaExample.lua)"
#define GET_URL2  R"(https://gitee.com/flame_cyclone/fcassistant-binary/releases/download/1.0.1.15/LuaExample.lua2)"

#define POST_URL  R"(https://gitee.com/flame_cyclone/fcassistant-binary/releases/download/1.0.1.15/LuaExample.lua)"

int main()
{
    curl_global_init(CURL_GLOBAL_ALL);


    CCurlRequest obj;
    std::string strResponse;
    obj.Get(GET_URL1, strResponse);
    obj.Post(POST_URL, strResponse, "{}");

    curl_global_cleanup();

    return 0;
}