linux下HttpGet、HttpPost的C++实现

傷城~ 2022-06-01 07:39 756阅读 0赞

## 前段时间，帮朋友实现linux C实现HTTP get 及POst请求，最原先打算使用libcurl库实现。但是考虑到和其他接口通信的情况，暂时使用C 来实现.代码可以自动解析URL连接，具体看下面代码： ##

**\[cpp\]** [view plain][] [copy][view plain]

1.  /\*File : http.h
2.   \*Auth : sjin
3.   \*Date : 20141206
4.   \*Mail : 413977243@qq.com
5.   \*/
6.  \#ifndef \_MY\_HTTP\_H
7.  \#define \_MY\_HTTP\_H
8.  
9.  \#define MY\_HTTP\_DEFAULT\_PORT 80
10. 
11. char \* http\_get(constchar \*url); 
12. char \* http\_post(constchar \*url,constchar \* post\_str); 
13. 
14. \#endif

**\[cpp\]** [view plain][] [copy][view plain]

1.  /\*File : http.c
2.   \*Auth : sjin
3.   \*Date : 20141206
4.   \*Mail : 413977243@qq.com
5.   \*/
6.  \#include <stdio.h>
7.  \#include <stdlib.h>
8.  \#include <arpa/inet.h>
9.  \#include <netdb.h>
10. \#include <string.h>
11. 
12. \#include "http.h"
13. 
14. \#define BUFFER\_SIZE 1024
15. \#define HTTP\_POST "POST /%s HTTP/1.1\\r\\nHOST: %s:%d\\r\\nAccept: \*/\*\\r\\n"\\
16. "Content-Type:application/x-www-form-urlencoded\\r\\nContent-Length: %d\\r\\n\\r\\n%s"
17. \#define HTTP\_GET "GET /%s HTTP/1.1\\r\\nHOST: %s:%d\\r\\nAccept: \*/\*\\r\\n\\r\\n"
18. 
19. 
20. staticint http\_tcpclient\_create(constchar \*host, int port)\{ 
21. struct hostent \*he; 
22. struct sockaddr\_in server\_addr; 
23. int socket\_fd; 
24. 
25. if((he = gethostbyname(host))==NULL)\{ 
26. return \-1; 
27.  \} 
28. 
29.  server\_addr.sin\_family = AF\_INET; 
30.  server\_addr.sin\_port = htons(port); 
31.  server\_addr.sin\_addr = \*((struct in\_addr \*)he->h\_addr); 
32. 
33. if((socket\_fd = socket(AF\_INET,SOCK\_STREAM,0))==-1)\{ 
34. return \-1; 
35.  \} 
36. 
37. if(connect(socket\_fd, (struct sockaddr \*)&server\_addr,sizeof(struct sockaddr)) == -1)\{ 
38. return \-1; 
39.  \} 
40. 
41. return socket\_fd; 
42. \} 
43. 
44. staticvoid http\_tcpclient\_close(int socket)\{ 
45.  close(socket); 
46. \} 
47. 
48. staticint http\_parse\_url(constchar \*url,char \*host,char \*file,int \*port) 
49. \{ 
50. char \*ptr1,\*ptr2; 
51. int len = 0; 
52. if(!url || !host || !file || !port)\{ 
53. return \-1; 
54.  \} 
55. 
56.  ptr1 = (char \*)url; 
57. 
58. if(!strncmp(ptr1,"http://",strlen("http://")))\{ 
59.  ptr1 += strlen("http://"); 
60.  \}else\{ 
61. return \-1; 
62.  \} 
63. 
64.  ptr2 = strchr(ptr1,'/'); 
65. if(ptr2)\{ 
66.  len = strlen(ptr1) - strlen(ptr2); 
67.  memcpy(host,ptr1,len); 
68.  host\[len\] = '\\0'; 
69. if(\*(ptr2 + 1))\{ 
70.  memcpy(file,ptr2 + 1,strlen(ptr2) - 1 ); 
71.  file\[strlen(ptr2) - 1\] = '\\0'; 
72.  \} 
73.  \}else\{ 
74.  memcpy(host,ptr1,strlen(ptr1)); 
75.  host\[strlen(ptr1)\] = '\\0'; 
76.  \} 
77. //get host and ip
78.  ptr1 = strchr(host,':'); 
79. if(ptr1)\{ 
80.  \*ptr1++ = '\\0'; 
81.  \*port = atoi(ptr1); 
82.  \}else\{ 
83.  \*port = MY\_HTTP\_DEFAULT\_PORT; 
84.  \} 
85. 
86. return 0; 
87. \} 
88. 
89. 
90. staticint http\_tcpclient\_recv(int socket,char \*lpbuff)\{ 
91. int recvnum = 0; 
92. 
93.  recvnum = recv(socket, lpbuff,BUFFER\_SIZE\*4,0); 
94. 
95. return recvnum; 
96. \} 
97. 
98. staticint http\_tcpclient\_send(int socket,char \*buff,int size)\{ 
99. int sent=0,tmpres=0; 
100. 
101. while(sent < size)\{ 
102.  tmpres = send(socket,buff+sent,size-sent,0); 
103. if(tmpres == -1)\{ 
104. return \-1; 
105.  \} 
106.  sent += tmpres; 
107.  \} 
108. return sent; 
109. \} 
110. 
111. staticchar \*http\_parse\_result(constchar\*lpbuf) 
112. \{ 
113. char \*ptmp = NULL; 
114. char \*response = NULL; 
115.  ptmp = (char\*)strstr(lpbuf,"HTTP/1.1"); 
116. if(!ptmp)\{ 
117.  printf("http/1.1 not faind\\n"); 
118. return NULL; 
119.  \} 
120. if(atoi(ptmp + 9)!=200)\{ 
121.  printf("result:\\n%s\\n",lpbuf); 
122. return NULL; 
123.  \} 
124. 
125.  ptmp = (char\*)strstr(lpbuf,"\\r\\n\\r\\n"); 
126. if(!ptmp)\{ 
127.  printf("ptmp is NULL\\n"); 
128. return NULL; 
129.  \} 
130.  response = (char \*)malloc(strlen(ptmp)+1); 
131. if(!response)\{ 
132.  printf("malloc failed \\n"); 
133. return NULL; 
134.  \} 
135.  strcpy(response,ptmp+4); 
136. return response; 
137. \} 
138. 
139. char \* http\_post(constchar \*url,constchar \*post\_str)\{ 
140. 
141. char post\[BUFFER\_SIZE\] = \{ '\\0'\}; 
142. int socket\_fd = -1; 
143. char lpbuf\[BUFFER\_SIZE\*4\] = \{ '\\0'\}; 
144. char \*ptmp; 
145. char host\_addr\[BUFFER\_SIZE\] = \{ '\\0'\}; 
146. char file\[BUFFER\_SIZE\] = \{ '\\0'\}; 
147. int port = 0; 
148. int len=0; 
149. char \*response = NULL; 
150. 
151. if(!url || !post\_str)\{ 
152.  printf(" failed!\\n"); 
153. return NULL; 
154.  \} 
155. 
156. if(http\_parse\_url(url,host\_addr,file,&port))\{ 
157.  printf("http\_parse\_url failed!\\n"); 
158. return NULL; 
159.  \} 
160. //printf("host\_addr : %s\\tfile:%s\\t,%d\\n",host\_addr,file,port);
161. 
162.  socket\_fd = http\_tcpclient\_create(host\_addr,port); 
163. if(socket\_fd < 0)\{ 
164.  printf("http\_tcpclient\_create failed\\n"); 
165. return NULL; 
166.  \} 
167. 
168.  sprintf(lpbuf,HTTP\_POST,file,host\_addr,port,strlen(post\_str),post\_str); 
169. 
170. if(http\_tcpclient\_send(socket\_fd,lpbuf,strlen(lpbuf)) < 0)\{ 
171.  printf("http\_tcpclient\_send failed..\\n"); 
172. return NULL; 
173.  \} 
174. //printf("发送请求:\\n%s\\n",lpbuf);
175. 
176. /\*it's time to recv from server\*/
177. if(http\_tcpclient\_recv(socket\_fd,lpbuf) <= 0)\{ 
178.  printf("http\_tcpclient\_recv failed\\n"); 
179. return NULL; 
180.  \} 
181. 
182.  http\_tcpclient\_close(socket\_fd); 
183. 
184. return http\_parse\_result(lpbuf); 
185. \} 
186. 
187. char \* http\_get(constchar \*url) 
188. \{ 
189. 
190. char post\[BUFFER\_SIZE\] = \{ '\\0'\}; 
191. int socket\_fd = -1; 
192. char lpbuf\[BUFFER\_SIZE\*4\] = \{ '\\0'\}; 
193. char \*ptmp; 
194. char host\_addr\[BUFFER\_SIZE\] = \{ '\\0'\}; 
195. char file\[BUFFER\_SIZE\] = \{ '\\0'\}; 
196. int port = 0; 
197. int len=0; 
198. 
199. if(!url)\{ 
200.  printf(" failed!\\n"); 
201. return NULL; 
202.  \} 
203. 
204. if(http\_parse\_url(url,host\_addr,file,&port))\{ 
205.  printf("http\_parse\_url failed!\\n"); 
206. return NULL; 
207.  \} 
208. //printf("host\_addr : %s\\tfile:%s\\t,%d\\n",host\_addr,file,port);
209. 
210.  socket\_fd = http\_tcpclient\_create(host\_addr,port); 
211. if(socket\_fd < 0)\{ 
212.  printf("http\_tcpclient\_create failed\\n"); 
213. return NULL; 
214.  \} 
215. 
216.  sprintf(lpbuf,HTTP\_GET,file,host\_addr,port); 
217. 
218. if(http\_tcpclient\_send(socket\_fd,lpbuf,strlen(lpbuf)) < 0)\{ 
219.  printf("http\_tcpclient\_send failed..\\n"); 
220. return NULL; 
221.  \} 
222. // printf("发送请求:\\n%s\\n",lpbuf);
223. 
224. if(http\_tcpclient\_recv(socket\_fd,lpbuf) <= 0)\{ 
225.  printf("http\_tcpclient\_recv failed\\n"); 
226. return NULL; 
227.  \} 
228.  http\_tcpclient\_close(socket\_fd); 
229. 
230. return http\_parse\_result(lpbuf); 
231. \}

转自：http://blog.csdn.net/dezhihuang/article/details/51355639

[view plain]: http://blog.csdn.net/sjin_1314/article/details/41776679#