C++中LibCurl库的使用教程分享

#define CURL_STATICLIB
#define BUILDING_LIBCURL
#include <iostream>
#include "curl/curl.h"
#pragma comment (lib,"libcurl_a.lib")
#pragma comment (lib,"wldap32.lib")
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"Crypt32.lib")
using namespace std;
int main(int argc, char *argv[])
{
	CURL *curl;
	CURLcode res;
	curl = curl_easy_init();
	if (curl)
	{
		curl_easy_setopt(curl, CURLOPT_URL, "https://www.lyshark.com");
		res = curl_easy_perform(curl);
		curl_easy_cleanup(curl);
	}
	std::cout << "返回状态: " << res << std::endl;
	system("pause");
	return 0;
}

#define CURL_STATICLIB
#define BUILDING_LIBCURL
#include <iostream>
#include "curl/curl.h"
#pragma comment (lib,"libcurl_a.lib")
#pragma comment (lib,"wldap32.lib")
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"Crypt32.lib")
using namespace std;
// 设置CURLOPT_WRITEFUNCTION回调函数,返回为空屏蔽输出
static size_t write_data(char *d, size_t n, size_t l, void *p)
{
	return 0;
}
// 获取网站返回值
void GetStatus(char *UrlPage)
{
	CURLcode return_code;
	// 初始化模块
	return_code = curl_global_init(CURL_GLOBAL_WIN32);
	if (CURLE_OK != return_code)
	{
		return;
	}
	// 初始化填充请求头
	struct curl_slist *headers = NULL;
	headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0)");
	headers = curl_slist_append(headers, "Referer: https://www.lyshark.com");
	// 初始化请求库
	CURL *easy_handle = curl_easy_init();
	if (NULL != easy_handle)
	{
		// CURLOPT_HTTPHEADER 自定义设置请求头
		curl_easy_setopt(easy_handle, CURLOPT_HTTPHEADER, headers);
		// CURLOPT_URL 自定义请求的网站
		curl_easy_setopt(easy_handle, CURLOPT_URL, UrlPage);
		// CURLOPT_WRITEFUNCTION 设置回调函数,屏蔽输出
		curl_easy_setopt(easy_handle, CURLOPT_WRITEFUNCTION, write_data);
		// 执行CURL访问网站
		return_code = curl_easy_perform(easy_handle);
		char *ipAddress = { 0 };
		// CURLINFO_PRIMARY_IP 获取目标IP信息
		return_code = curl_easy_getinfo(easy_handle, CURLINFO_PRIMARY_IP, &ipAddress);
		if ((CURLE_OK == return_code) && ipAddress)
		{
			std::cout << "目标IP: " << ipAddress << std::endl;
		}
		long retcode = 0;
		// CURLINFO_RESPONSE_CODE 获取目标返回状态
		return_code = curl_easy_getinfo(easy_handle, CURLINFO_RESPONSE_CODE, &retcode);
		if ((CURLE_OK == return_code) && retcode)
		{
			std::cout << "返回状态码: " << retcode << std::endl;
		}
	}
	curl_easy_cleanup(easy_handle);
	curl_global_cleanup();
}
int main(int argc, char *argv[])
{
	GetStatus("https://www.lyshark.com");
	system("pause");
	return 0;
}

#define CURL_STATICLIB
#define BUILDING_LIBCURL
#include <iostream>
#include "curl/curl.h"
#pragma comment (lib,"libcurl_a.lib")
#pragma comment (lib,"wldap32.lib")
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"Crypt32.lib")
using namespace std;
bool SendPost(char *Url, char *Cookie, char *PostVal)
{
	CURL *curl;
	CURLcode res;
	// 初始化库
	curl = curl_easy_init();
	if (curl)
	{
		// 设置请求头
		struct curl_slist *headers = NULL;
		headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0)");
		headers = curl_slist_append(headers, "Referer: https://www.lyshark.com");
		// 设置请求头
		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
		// 指定URL
		curl_easy_setopt(curl, CURLOPT_URL, Url);
		// 指定cookie参数
		curl_easy_setopt(curl, CURLOPT_COOKIEFILE, Cookie);
		// 指定post内容
		curl_easy_setopt(curl, CURLOPT_POSTFIELDS, PostVal);
		// 是否代理
		// curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");
		res = curl_easy_perform(curl);
		curl_easy_cleanup(curl);
	}
	return true;
}
int main(int argc, char *argv[])
{
	// 传入网址 cookie 以及post参数
	SendPost("https://www.lyshark.com/post.php", "1e12sde342r2", "&logintype=uid&u=xieyan&psw=xxx86");
	system("pause");
	return 0;
}

#define CURL_STATICLIB
#define BUILDING_LIBCURL
#include <iostream>
#include "curl/curl.h"
#pragma comment (lib,"libcurl_a.lib")
#pragma comment (lib,"wldap32.lib")
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"Crypt32.lib")
using namespace std;
FILE *fp;
size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
	int written = fwrite(ptr, size, nmemb, (FILE *)fp);
	return written;
}
BOOL GetUrl(char *URL, char *FileName)
{
	CURL *curl;
	curl_global_init(CURL_GLOBAL_ALL);
	curl = curl_easy_init();
	curl_easy_setopt(curl, CURLOPT_URL, URL);
	// 在屏幕打印请求连接过程和返回http数据
	curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
	// 查找次数,防止查找太深
	curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 1);
	// 设置连接超时
	curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 3);
	// 接收数据时超时设置
	curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3);
	if ((fp = fopen(FileName, "w")) == NULL)
	{
		curl_easy_cleanup(curl);
		return FALSE;
	}
	// CURLOPT_WRITEFUNCTION 将后继的动作交给write_data函数处理
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
	curl_easy_perform(curl);
	curl_easy_cleanup(curl);
	return TRUE;
}
int main(int argc, char *argv[])
{
	// 下载网页到本地
	GetUrl("https://www.lyshark.com", "./lyshark.html");
	system("pause");
	return 0;
}

#define CURL_STATICLIB
#define BUILDING_LIBCURL
#include <iostream>
#include <string>
#include "curl/curl.h"
#pragma comment (lib,"libcurl_a.lib")
#pragma comment (lib,"wldap32.lib")
#pragma comment (lib,"ws2_32.lib")
#pragma comment (lib,"Crypt32.lib")
using namespace std;
// 存储回调函数
size_t WriteCallback(char *contents, size_t size, size_t nmemb, void *userp)
{
	((std::string*)userp)->append((char*)contents, size * nmemb);
	return size * nmemb;
}
// 获取数据并放入string中.
std::string GetUrlPageOfString(std::string url)
{
	std::string read_buffer;
	CURL *curl;
	curl_global_init(CURL_GLOBAL_ALL);
	curl = curl_easy_init();
	if (curl)
	{
		// 忽略证书检查
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
		// 重定向
		curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
		// URL路径
		curl_easy_setopt(curl, CURLOPT_URL, url);
		// 查找次数,防止查找太深
		curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 1);
		// 连接超时
		curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 3);
		// 接收数据时超时设置
		curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3);
		// 写入回调函数
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &read_buffer);
		curl_easy_perform(curl);
		curl_easy_cleanup(curl);
		return read_buffer;
	}
	return "None";
}
int main(int argc, char *argv[])
{
	std::string urls = GetUrlPageOfString("https://www.lyshark.com");
	std::cout << "接收长度: " << urls.length() << " bytes" << std::endl;
	system("pause");
	return 0;
}