一、下載
官網下載地址 ： https://curl.haxx.se/download.html
選擇最新的一個即可。
二、安裝
1、解壓
下載到的壓縮包為curl-7.51.0.tar.gz，使用命令 tar -zxvf curl-7.51.0.tar.gz 解壓。
2、進入解壓出的目錄curl-7.51.0，執行
（1）sudo ./configure
（2）sudo make
（3）sudo make install
安裝完成，在命令行測試是否可用，直接輸入curl，出現如下情況安裝基本成功
如果提示該命令不存在。則執行以下命令：
export PATH=$PATH:/usr/local/curl/bin
檢查/usr/include/里有沒有crul沒有的話，需要把解壓出的include文件夾下的文件復制過去。
cp -r curl-7.51.0/include/curl/ /usr/include/
檢查庫和頭文件
[root@localhost curl-7.51.0]# curl-config --cflags
-I/usr/local/include
[root@localhost curl-7.51.0]# curl-config --libs
-L/usr/local/lib -lcurl
以后使用gcc編譯使用libcurl的c代碼，都需加上-lcurl。
三、編譯代碼
使用libcurl官網的例子，只稍微修改。
- /***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2015, 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.
- *
- ***************************************************************************/
- #include <stdio.h>
- #include <curl/curl.h>
- /* <DESC>
- * Get a single file from an FTPS server.
- * </DESC>
- */
- struct FtpFile {
- const char *filename;
- FILE *stream;
- };
- static size_t my_fwrite(void *buffer, size_t size, size_t nmemb,
- void *stream)
- {
- struct FtpFile *out=(struct FtpFile *)stream;
- if(out && !out->stream) {
- /* open file for writing */
- out->stream=fopen(out->filename, "wb");
- if(!out->stream)
- return -1; /* failure, can't open file to write */
- }
- return fwrite(buffer, size, nmemb, out->stream);
- }
- int main(void)
- {
- CURL *curl;
- CURLcode res;
- struct FtpFile ftpfile={
- "yourfile.bin", /* name to store the file as if successful */
- NULL
- };
- printf("come in");
- return 0;
- curl_global_init(CURL_GLOBAL_DEFAULT);
- curl = curl_easy_init();
- if(curl) {
- /*
- * You better replace the URL with one that works! Note that we use an
- * FTP:// URL with standard explicit FTPS. You can also do FTPS:// URLs if
- * you want to do the rarer kind of transfers: implicit.
- */
- curl_easy_setopt(curl, CURLOPT_URL,
- "ftp://user@server/home/user/file.txt");
- /* Define our callback to get called when there's data to be written */
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
- /* Set a pointer to our struct to pass to the callback */
- curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);
- /* We activate SSL and we require it for both control and data */
- curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
- /* Switch on full protocol/debug output */
- curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
- res = curl_easy_perform(curl);
- /* always cleanup */
- curl_easy_cleanup(curl);
- if(CURLE_OK != res) {
- /* we failed */
- fprintf(stderr, "curl told us %d\n", res);
- }
- }
- if(ftpfile.stream)
- fclose(ftpfile.stream); /* close the local file */
- curl_global_cleanup();
- return 0;
- }
編譯：gcc ftpsget.c -o ddd.out -lcurl
執行：
可能會出現的問題：error while loading shared libraries: libcurl.so.4: cannot open shared object file: No such file or directory
解決方法：
查找 libcurl所有相關的so庫所在位置，在/etc/ld.so.conf中加入libcurl有關so庫所在目錄。
進入根目錄/，執行find -name *libcurl.so*，就會發現所在目錄。
在/etc/ld.so.conf中加入 /usr/local/lib 這一行，
保存/etc/ld.so.conf
執行命令 /sbin/ldconfig -v 生效。