C++使用curl發送get請求

libcurl的編譯在其它博客裏已經介紹了，這裏不再講解。

#include<iostream>
#include<string>
#include<curl\curl.h>
using namespace std;
//get請求和post請求數據響應函數
size_t req_reply(void *ptr, size_t size, size_t nmemb, void *stream)
{
	//在註釋的裏面可以打印請求流，cookie的信息
	//cout << "----->reply" << endl;
	string *str = (string*)stream;
	//cout << *str << endl;
	(*str).append((char*)ptr, size*nmemb);
	return size * nmemb;
}
//http GET請求  
CURLcode curl_get_req(const std::string &url, std::string &response)
{
	//curl初始化  
	CURL *curl = curl_easy_init();
	// curl返回值 
	CURLcode res;
	if (curl)
	{
		//設置curl的請求頭
		struct curl_slist* header_list = NULL;
		header_list = curl_slist_append(header_list, "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko");
		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header_list);

		//不接收響應頭數據0代表不接收 1代表接收
		curl_easy_setopt(curl, CURLOPT_HEADER, 0);

		//設置請求的URL地址 
		curl_easy_setopt(curl, CURLOPT_URL, url.c_str());

		//設置ssl驗證
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);

		//CURLOPT_VERBOSE的值爲1時，會顯示詳細的調試信息
		curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);

		curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);

		//設置數據接收函數
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, req_reply);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&response);

		curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);

		//設置超時時間
		curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 6); // set transport and time out time  
		curl_easy_setopt(curl, CURLOPT_TIMEOUT, 6);

		// 開啓請求  
		res = curl_easy_perform(curl);
	}
	// 釋放curl 
	curl_easy_cleanup(curl);
	return res;
}
int main()
{
	string getUrlStr = "https://www.baidu.com/";
	string getResponseStr;
	auto res = curl_get_req(getUrlStr, getResponseStr);
	if (res == CURLE_OK)
	{
		cout << getResponseStr << endl;
	}
	getchar();
	return 0;
}

注意使用curl接收的數據字符串編碼格式爲utf8編碼的，在vs2015中控制檯上對於中文是顯示不正常，需要進項編碼轉換，utf8轉換爲ansi格式。