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：

Get.cpp

 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 }

实现HTTP/POST：

Post.cpp

 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 }

其他代码：

utils.cpp
 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 <string>
11 #include <Windows.h>
12 #include <wchar.h>
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 }  
 1 #ifndef _MAIN_H
 2 #define _MAIN_H
 3 
 4 #include <iostream>
 5 #include <string>
 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

对应libcurl库和头文件下载地址(支持HTTPS)：点击下载

扫码关注公众号

专注分享C/C++，C++(11,14,17)，STL，Java，Spring，mybatis，mysql，redis，分布式，高并发，设计模式，爬虫，docker，shell编程等相关技术，还有高薪互联网职位内推，在这里一起探讨，一起学习，一起进步，同时不定期分享视频书籍资源，充分利用碎片化时间，让我们的技术之路更加有乐趣。

posted @ 2018-10-16 15:31  蜗牛201  阅读(5499)  评论(0)  编辑  收藏  举报