* GET - 从指定的资源请求数据。
* POST - 向指定的资源提交要被处理的数据
* PUT请求：如果两个请求相同，后一个请求会把第一个请求覆盖掉。（所以PUT用来改资源）
* Post请求：后一个请求不会把第一个请求覆盖掉。（所以Post用来增资源）

POST

/****************************************************************************                                  _   _ ____  _*  Project                     ___| | | |  _ \| |*                             / __| | | | |_) | |*                            | (__| |_| |  _ <| |___*                             \___|\___/|_| \_\_____|** Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.** This software is licensed as described in the file COPYING, which* you should have received as part of this distribution. The terms* are also available at https://curl.haxx.se/docs/copyright.html.** You may opt to use, copy, modify, merge, publish, distribute and/or sell* copies of the Software, and permit persons to whom the Software is* furnished to do so, under the terms of the COPYING file.** This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY* KIND, either express or implied.****************************************************************************/
/* <DESC>* simple HTTP POST using the easy interface* </DESC>*  GET - 从指定的资源请求数据。*  POST - 向指定的资源提交要被处理的数据*/
#include <stdio.h>
#include <curl/curl.h>int main(void)
{CURL *curl;CURLcode res;/* In windows, this will init the winsock stuff */curl_global_init(CURL_GLOBAL_ALL);/* get a curl handle */curl = curl_easy_init();if(curl) {/* First set the URL that is about to receive our POST. This URL canjust as well be a https:// URL if that is what should receive thedata. */curl_easy_setopt(curl, CURLOPT_URL, "http://10.170.6.66/moo.cgi");/* Now specify the POST data */curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "name=daniel&project=curl");/* Perform the request, res will get the return code */res = curl_easy_perform(curl);/* Check for errors */if(res != CURLE_OK)fprintf(stderr, "curl_easy_perform() failed: %s\n",curl_easy_strerror(res));/* always cleanup */curl_easy_cleanup(curl);}curl_global_cleanup();return 0;
}

PUT

/****************************************************************************                                  _   _ ____  _*  Project                     ___| | | |  _ \| |*                             / __| | | | |_) | |*                            | (__| |_| |  _ <| |___*                             \___|\___/|_| \_\_____|** Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.** This software is licensed as described in the file COPYING, which* you should have received as part of this distribution. The terms* are also available at https://curl.haxx.se/docs/copyright.html.** You may opt to use, copy, modify, merge, publish, distribute and/or sell* copies of the Software, and permit persons to whom the Software is* furnished to do so, under the terms of the COPYING file.** This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY* KIND, either express or implied.****************************************************************************/
/* <DESC>* HTTP PUT with easy interface and read callback* </DESC>*  PUT请求：如果两个请求相同，后一个请求会把第一个请求覆盖掉。（所以PUT用来改资源）*  Post请求：后一个请求不会把第一个请求覆盖掉。（所以Post用来增资源）*/
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <curl/curl.h>/** This example shows a HTTP PUT operation. PUTs a file given as a command* line argument to the URL also given on the command line.** This example also uses its own read callback.** Here's an article on how to setup a PUT handler for Apache:* http://www.apacheweek.com/features/put*/static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
{size_t retcode;curl_off_t nread;/* in real-world cases, this would probably get this data differentlyas this fread() stuff is exactly what the library already would doby default internally */retcode = fread(ptr, size, nmemb, stream);nread = (curl_off_t)retcode;fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T" bytes from file\n", nread);return retcode;
}int main(int argc, char **argv)
{CURL *curl;CURLcode res;FILE * hd_src;struct stat file_info;char *file;char *url;if(argc < 3)return 1;file = argv[1];url = argv[2];/* get the file size of the local file */stat(file, &file_info);/* get a FILE * of the same file, could also be made withfdopen() from the previous descriptor, but hey this is justan example! */hd_src = fopen(file, "rb");/* In windows, this will init the winsock stuff */curl_global_init(CURL_GLOBAL_ALL);/* get a curl handle */curl = curl_easy_init();if(curl) {/* we want to use our own read function */curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);/* enable uploading */curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);/* HTTP PUT please */curl_easy_setopt(curl, CURLOPT_PUT, 1L);/* specify target URL, and note that this URL should include a filename, not only a directory */curl_easy_setopt(curl, CURLOPT_URL, url);/* now specify which file to upload */curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);/* provide the size of the upload, we specicially typecast the valueto curl_off_t since we must be sure to use the correct data size */curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,(curl_off_t)file_info.st_size);/* Now run off and do what you've been told! */res = curl_easy_perform(curl);/* Check for errors */if(res != CURLE_OK)fprintf(stderr, "curl_easy_perform() failed: %s\n",curl_easy_strerror(res));/* always cleanup */curl_easy_cleanup(curl);}fclose(hd_src); /* close the local file */curl_global_cleanup();return 0;
}

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C语言CURL实现HTTP POST、GET、PUT

POST

PUT

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