基于libcurl实现REST风格http/https的get和post
c/c++开发中经常要用到http/https协议，直接使用socket工作量很大，要是使用socket实现https，那更不可思议，开源的c/c++的http客户端框架，libcurl是首选，而且也相当成熟稳定，最近C++项目中用到https请求，就做下研究。
libcurl简介(来源官网)
libcurl是一个跨平台的网络协议库，支持http, https, ftp, gopher, telnet, dict, file, 和ldap 协议。libcurl同样支持HTTPS证书授权，HTTP POST, HTTP PUT, FTP 上传, HTTP基本表单上传，代理，cookies,和用户认证。官网地址：https://curl.haxx.se/libcurl/
实现HTTP/GET：
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1 /********************************************************
2 Copyright (C), 2016-2018,
3 FileName: Get
4 Author: woniu201
5 Email: wangpengfei.201@163.com
6 Created: 2018/10/15
7 Description: 实现HTTP/HTTPS GET请求
8 ********************************************************/
9 #include "main.h"
10
11 size_t WriteGetResp(void *buffer, size_t size, size_t nmemb, void *userp)
12 {
13 ((string*)userp)->append((char*)buffer, 0, size*nmemb);
14 return size*nmemb;
15 }
16
17 /************************************
18 @ Brief: GET请求
19 @ Author: woniu201
20 @ Created: 2018/10/15
21 @ Return:
22 ************************************/
23 int HttpGet(char* url)
24 {
25 string respData;
26 CURL* curl;
27 CURLcode res;
28
29 curl = curl_easy_init();
30 if (curl == NULL)
31 {
32 return 1;
33 }
34
35 curl_easy_setopt(curl, CURLOPT_URL, url);
36 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteGetResp);
37 curl_easy_setopt(curl, CURLOPT_WRITEDATA, &respData);
38
39 // curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 5000); //libcurl存在毫秒超时bug,如果设备小于1000ms立即返回失败
40 // curl_easy_setopt(curl, CURLOPT_TIMEOUT_MS, 5000); //设置超时时间
41
42 bool bCA = FALSE;
43 if (!bCA)
44 {
45 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);//设定为不验证证书和HOST
46 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, FALSE);
47 }
48 else
49 {
50 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, TRUE);
51 curl_easy_setopt(curl, CURLOPT_CAINFO, "");
52 }
53
54 res = curl_easy_perform(curl);
55 if (res != CURLE_OK)
56 {
57 cout << curl_easy_strerror(res) << endl;
58 }
59
60 curl_easy_cleanup(curl);
61
62 cout << Utf8ToAscii(respData) << endl;
63 return 0;
64 }
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实现HTTP/POST：
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1 /********************************************************
2 Copyright (C), 2016-2018,
3 FileName: Post
4 Author: woniu201
5 Email: wangpengfei.201@163.com
6 Created: 2018/10/15
7 Description: 实现HTTP/HTTPS POST请求
8 ********************************************************/
9 #include "main.h"
10
11 size_t WritePostBodyResp(void *buffer, size_t size, size_t nmemb, void *userp)
12 {
13 ((string*)userp)->append((char*)buffer, 0, size*nmemb);
14 return size*nmemb;
15 }
16
17 size_t WritePostHeaderResp(void *buffer, size_t size, size_t nmemb, void *userp)
18 {
19 ((string*)userp)->append((char*)buffer, 0, size*nmemb);
20 return size*nmemb;
21 }
22
23 /************************************
24 @ Brief: POST请求
25 @ Author: woniu201
26 @ Created: 2018/10/15
27 @ Return:
28 ************************************/
29 int HttpPost(char* url, char* body)
30 {
31 string respBodyData;
32 string respHeadData;
33 CURL* curl;
34 CURLcode res;
35
36 //设置头
37 struct curl_slist *headers = NULL;
38 headers = curl_slist_append(headers, "Content-Type:application/json;charset=UTF-8");
39
40 curl = curl_easy_init();
41 if (curl == NULL)
42 {
43 return 1;
44 }
45
46 curl_easy_setopt(curl, CURLOPT_URL, url);
47 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body);
48 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
49
50 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, WritePostHeaderResp);
51 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WritePostBodyResp);
52 curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &respHeadData);
53 curl_easy_setopt(curl, CURLOPT_WRITEDATA, &respBodyData);
54
55 // curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 5000); //libcurl存在毫秒超时bug,如果设备小于1000ms立即返回失败
56 // curl_easy_setopt(curl, CURLOPT_TIMEOUT_MS, 5000); //设置超时时间
57
58 bool bCA = FALSE;
59 if (!bCA)
60 {
61 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);//设定为不验证证书和HOST
62 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, FALSE);
63 }
64 else
65 {
66 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, TRUE);
67 curl_easy_setopt(curl, CURLOPT_CAINFO, "");
68 }
69
70 res = curl_easy_perform(curl);
71 if (res != CURLE_OK)
72 {
73 cout << curl_easy_strerror(res) << endl;
74 }
75 curl_slist_free_all(headers);
76 curl_easy_cleanup(curl);
77
78 cout << Utf8ToAscii(respHeadData) << endl;
79 cout << Utf8ToAscii(respBodyData) << endl;
80
81 return 0;
82 }
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其他代码：
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1 /********************************************************
2 Copyright (C), 2016-2018,
3 FileName: utils
4 Author: woniu201
5 Email: wangpengfei.201@163.com
6 Created: 2018/10/15
7 Description: ASSIC--UTF8互转
8 ********************************************************/
9 #include "main.h"
10 #include
11 #include
12 #include
13 using namespace std;
14
15 wstring AsciiToUnicode(const string& str) {
16 // 预算-缓冲区中宽字节的长度
17 int unicodeLen = MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, nullptr, 0);
18 // 给指向缓冲区的指针变量分配内存
19 wchar_t *pUnicode = (wchar_t*)malloc(sizeof(wchar_t)*unicodeLen);
20 // 开始向缓冲区转换字节
21 MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, pUnicode, unicodeLen);
22 wstring ret_str = pUnicode;
23 free(pUnicode);
24 return ret_str;
25 }
26 string UnicodeToAscii(const wstring& wstr) {
27 // 预算-缓冲区中多字节的长度
28 int ansiiLen = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), -1, nullptr, 0, nullptr, nullptr);
29 // 给指向缓冲区的指针变量分配内存
30 char *pAssii = (char*)malloc(sizeof(char)*ansiiLen);
31 // 开始向缓冲区转换字节
32 WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), -1, pAssii, ansiiLen, nullptr, nullptr);
33 string ret_str = pAssii;
34 free(pAssii);
35 return ret_str;
36 }
37
38 wstring Utf8ToUnicode(const string& str) {
39 // 预算-缓冲区中宽字节的长度
40 int unicodeLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, nullptr, 0);
41 // 给指向缓冲区的指针变量分配内存
42 wchar_t *pUnicode = (wchar_t*)malloc(sizeof(wchar_t)*unicodeLen);
43 // 开始向缓冲区转换字节
44 MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, pUnicode, unicodeLen);
45 wstring ret_str = pUnicode;
46 free(pUnicode);
47 return ret_str;
48 }
49 string UnicodeToUtf8(const wstring& wstr) {
50 // 预算-缓冲区中多字节的长度
51 int ansiiLen = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, nullptr, 0, nullptr, nullptr);
52 // 给指向缓冲区的指针变量分配内存
53 char *pAssii = (char*)malloc(sizeof(char)*ansiiLen);
54 // 开始向缓冲区转换字节
55 WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, pAssii, ansiiLen, nullptr, nullptr);
56 string ret_str = pAssii;
57 free(pAssii);
58 return ret_str;
59 }
60
61 /************************************
62 @ Brief: ASSIC转UTF8
63 @ Author: woniu201
64 @ Created: 2018/10/16
65 @ Return:
66 ************************************/
67 string AsciiToUtf8(const string& str) {
68 return UnicodeToUtf8(AsciiToUnicode(str));
69 }
70
71 /************************************
72 @ Brief: UTF8转ASSIC
73 @ Author: woniu201
74 @ Created: 2018/10/16
75 @ Return:
76 ************************************/
77 string Utf8ToAscii(const string& str) {
78 return UnicodeToAscii(Utf8ToUnicode(str));
79 }
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1 #ifndef _MAIN_H
2 #define _MAIN_H
3
4 #include
5 #include
6 #include "include/curl.h"
7
8 using namespace std;
9
10
11 #pragma comment(lib, "ssleay32.lib")
12 #pragma comment(lib, "libcurl.lib")
13
14 string AsciiToUtf8(const string& str);
15 string Utf8ToAscii(const string& str);
16
17 int HttpGet(char* url);
18 int HttpPost(char* url, char* body);
19 int HttpDownload(char* url, char* filePath);
20 #endif
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对应libcurl库和头文件下载地址(支持HTTPS)：点击下载https://www.cnblogs.com/woniu201/p/9798278.html
