C语言curl实现FTP上传、下载、获取文件信息
2024-05-06 14:04:08
目录
Get a single file from an FTP server.
Checks a single file's size and mtime from an FTP server.
Get a single file from an FTP server.but also stores the received response-lines
Get a single file from an FTPS server.2
Performs an FTP upload and renames the file just after a successful transfer.
FTP upload a file from memory
Upload to FTP, resuming failed transfers.
Get a single file from an FTP server.
/**************************************************************************** _ _ ____ _* 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.****************************************************************************/
#include <stdio.h>#include <curl/curl.h>/* <DESC>* Get a single file from an FTP 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->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 = {"testfile", /* name to store the file as if successful */NULL};curl_global_init(CURL_GLOBAL_DEFAULT);curl = curl_easy_init();if(curl) {/** You better replace the URL with one that works!*/curl_easy_setopt(curl, CURLOPT_URL,"http://10.170.6.66/testfile");/* 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);/* 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;
}
Checks a single file's size and mtime from an FTP server.
/**************************************************************************** _ _ ____ _* 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.****************************************************************************/
#include <stdio.h>
#include <string.h>#include <curl/curl.h>/* <DESC>* Checks a single file's size and mtime from an FTP server.* </DESC>*/static size_t throw_away(void *ptr, size_t size, size_t nmemb, void *data)
{(void)ptr;(void)data;/* we are not interested in the headers itself,so we only return the size we would have saved ... */return (size_t)(size * nmemb);
}int main(void)
{char ftpurl[] = "http://10.170.6.66/testfile";CURL *curl;CURLcode res;long filetime = -1;double filesize = 0.0;const char *filename = strrchr(ftpurl, '/') + 1;curl_global_init(CURL_GLOBAL_DEFAULT);curl = curl_easy_init();if(curl) {curl_easy_setopt(curl, CURLOPT_URL, ftpurl);/* No download if the file */curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);/* Ask for filetime */curl_easy_setopt(curl, CURLOPT_FILETIME, 1L);curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, throw_away);curl_easy_setopt(curl, CURLOPT_HEADER, 0L);/* Switch on full protocol/debug output *//* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */res = curl_easy_perform(curl);if(CURLE_OK == res) {/* https://curl.haxx.se/libcurl/c/curl_easy_getinfo.html */res = curl_easy_getinfo(curl, CURLINFO_FILETIME, &filetime);if((CURLE_OK == res) && (filetime >= 0)) {time_t file_time = (time_t)filetime;printf("filetime %s: %s", filename, ctime(&file_time));}res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD,&filesize);if((CURLE_OK == res) && (filesize>0.0))printf("filesize %s: %0.0f bytes\n", filename, filesize);}else {/* we failed */fprintf(stderr, "curl told us %d\n", res);}/* always cleanup */curl_easy_cleanup(curl);}curl_global_cleanup();return 0;
}
Get a single file from an FTP server.but also stores the received response-lines
/**************************************************************************** _ _ ____ _* Project ___| | | | _ \| |* / __| | | | |_) | |* | (__| |_| | _ <| |___* \___|\___/|_| \_\_____|** Copyright (C) 1998 - 2016, 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>* Similar to ftpget.c but also stores the received response-lines* in a separate file using our own callback!* </DESC>*/
static size_t
write_response(void *ptr, size_t size, size_t nmemb, void *data)
{FILE *writehere = (FILE *)data;return fwrite(ptr, size, nmemb, writehere);
}#define FTPBODY "ftp-list"
#define FTPHEADERS "ftp-responses"int main(void)
{CURL *curl;CURLcode res;FILE *ftpfile;FILE *respfile;/* local file name to store the file as */ftpfile = fopen(FTPBODY, "wb"); /* b is binary, needed on win32 *//* local file name to store the FTP server's response lines in */respfile = fopen(FTPHEADERS, "wb"); /* b is binary, needed on win32 */curl = curl_easy_init();if(curl) {/* Get a file listing from sunet */curl_easy_setopt(curl, CURLOPT_URL, "http://10.170.6.66/testfile");curl_easy_setopt(curl, CURLOPT_WRITEDATA, ftpfile);/* If you intend to use this on windows with a libcurl DLL, you must useCURLOPT_WRITEFUNCTION as well */curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_response);curl_easy_setopt(curl, CURLOPT_HEADERDATA, respfile);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(ftpfile); /* close the local file */fclose(respfile); /* close the response file */return 0;
}
Get a single file from an FTPS server.2
/**************************************************************************** _ _ ____ _* 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.****************************************************************************/#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->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.txt", /* name to store the file as if successful */NULL};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,"http://10.170.6.66/testfile");/* 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;
}
Performs an FTP upload and renames the file just after a successful transfer.
/**************************************************************************** _ _ ____ _* 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.****************************************************************************/
#include <stdio.h>
#include <string.h>#include <curl/curl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#ifdef WIN32
#include <io.h>
#else
#include <unistd.h>
#endif/* <DESC>* Performs an FTP upload and renames the file just after a successful* transfer.* </DESC>*///#define LOCAL_FILE "/tmp/uploadthis.txt"
//#define UPLOAD_FILE_AS "while-uploading.txt"
//#define REMOTE_URL "ftp://example.com/" UPLOAD_FILE_AS
//#define RENAME_FILE_TO "renamed-and-fine.txt"#define LOCAL_FILE "uploadthis.txt"
#define UPLOAD_FILE_AS "while-uploading.txt"
#define REMOTE_URL "http://10.170.6.66/"
#define RENAME_FILE_TO "renamed-and-fine.txt"/* NOTE: if you want this example to work on Windows with libcurl as aDLL, you MUST also provide a read callback with CURLOPT_READFUNCTION.Failing to do so will give you a crash since a DLL may not use thevariable's memory when passed in to it from an app like this. */
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
{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 */size_t 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(void)
{CURL *curl;CURLcode res;FILE *hd_src;struct stat file_info;curl_off_t fsize;struct curl_slist *headerlist = NULL;static const char buf_1 [] = "RNFR " UPLOAD_FILE_AS;static const char buf_2 [] = "RNTO " RENAME_FILE_TO;/* get the file size of the local file */if(stat(LOCAL_FILE, &file_info)) {printf("Couldn't open '%s': %s\n", LOCAL_FILE, strerror(errno));return 1;}fsize = (curl_off_t)file_info.st_size;printf("Local file size: %" CURL_FORMAT_CURL_OFF_T " bytes.\n", fsize);/* get a FILE * of the same file */hd_src = fopen(LOCAL_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) {/* build a list of commands to pass to libcurl */headerlist = curl_slist_append(headerlist, buf_1);headerlist = curl_slist_append(headerlist, buf_2);/* 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);/* specify target */curl_easy_setopt(curl, CURLOPT_URL, REMOTE_URL);/* pass in that last of FTP commands to run after the transfer */curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);/* now specify which file to upload */curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);/* Set the size of the file to upload (optional). If you give a *_LARGEoption you MUST make sure that the type of the passed-in argument is acurl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you mustmake sure that to pass in a type 'long' argument. */curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,(curl_off_t)fsize);/* 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));/* clean up the FTP commands list */curl_slist_free_all(headerlist);/* always cleanup */curl_easy_cleanup(curl);}fclose(hd_src); /* close the local file */curl_global_cleanup();return 0;
}
FTP upload a file from memory
/**************************************************************************** _ _ ____ _* 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>* FTP upload a file from memory* </DESC>*/
#include <stdio.h>
#include <string.h>
#include <curl/curl.h>static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing elit. ""Nam rhoncus odio id venenatis volutpat. Vestibulum dapibus ""bibendum ullamcorper. Maecenas finibus elit augue, vel ""condimentum odio maximus nec. In hac habitasse platea dictumst. ""Vestibulum vel dolor et turpis rutrum finibus ac at nulla. ""Vivamus nec neque ac elit blandit pretium vitae maximus ipsum. ""Quisque sodales magna vel erat auctor, sed pellentesque nisi ""rhoncus. Donec vehicula maximus pretium. Aliquam eu tincidunt ""lorem.";struct WriteThis {const char *readptr;size_t sizeleft;
};static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
{struct WriteThis *upload = (struct WriteThis *)userp;size_t max = size*nmemb;if(max < 1)return 0;if(upload->sizeleft) {size_t copylen = max;if(copylen > upload->sizeleft)copylen = upload->sizeleft;memcpy(ptr, upload->readptr, copylen);upload->readptr += copylen;upload->sizeleft -= copylen;return copylen;}return 0; /* no more data left to deliver */
}int main(void)
{CURL *curl;CURLcode res;struct WriteThis upload;upload.readptr = data;upload.sizeleft = strlen(data);/* In windows, this will init the winsock stuff */res = curl_global_init(CURL_GLOBAL_DEFAULT);/* Check for errors */if(res != CURLE_OK) {fprintf(stderr, "curl_global_init() failed: %s\n",curl_easy_strerror(res));return 1;}/* get a curl handle */curl = curl_easy_init();if(curl) {/* First set the URL, the target file */curl_easy_setopt(curl, CURLOPT_URL,"ftp://example.com/path/to/upload/file");/* User and password for the FTP login */curl_easy_setopt(curl, CURLOPT_USERPWD, "login:secret");/* Now specify we want to UPLOAD data */curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);/* we want to use our own read function */curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);/* pointer to pass to our read function */curl_easy_setopt(curl, CURLOPT_READDATA, &upload);/* get verbose debug output please */curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);/* Set the expected upload size. */curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,(curl_off_t)upload.sizeleft);/* 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;
}
Upload to FTP, resuming failed transfers.
/**************************************************************************** _ _ ____ _* 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>* Upload to FTP, resuming failed transfers.* </DESC>*/#include <stdlib.h>
#include <stdio.h>
#include <curl/curl.h>/* parse headers for Content-Length */
static size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb,void *stream)
{int r;long len = 0;r = sscanf(ptr, "Content-Length: %ld\n", &len);if(r)*((long *) stream) = len;return size * nmemb;
}/* discard downloaded data */
static size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
{(void)ptr;(void)stream;return size * nmemb;
}/* read data to upload */
static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
{FILE *f = stream;size_t n;if(ferror(f))return CURL_READFUNC_ABORT;n = fread(ptr, size, nmemb, f) * size;return n;
}static int upload(CURL *curlhandle, const char *remotepath,const char *localpath, long timeout, long tries)
{FILE *f;long uploaded_len = 0;CURLcode r = CURLE_GOT_NOTHING;int c;f = fopen(localpath, "rb");if(!f) {perror(NULL);return 0;}curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);if(timeout)curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);/* disable passive mode */curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);for(c = 0; (r != CURLE_OK) && (c < tries); c++) {/* are we resuming? */if(c) { /* yes *//* determine the length of the file already written *//** With NOBODY and NOHEADER, libcurl will issue a SIZE* command, but the only way to retrieve the result is* to parse the returned Content-Length header. Thus,* getcontentlengthfunc(). We need discardfunc() above* because HEADER will dump the headers to stdout* without it.*/curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);r = curl_easy_perform(curlhandle);if(r != CURLE_OK)continue;curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);fseek(f, uploaded_len, SEEK_SET);curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);}else { /* no */curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);}r = curl_easy_perform(curlhandle);}fclose(f);if(r == CURLE_OK)return 1;else {fprintf(stderr, "%s\n", curl_easy_strerror(r));return 0;}
}int main(void)
{CURL *curlhandle = NULL;curl_global_init(CURL_GLOBAL_ALL);curlhandle = curl_easy_init();upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",0, 3);curl_easy_cleanup(curlhandle);curl_global_cleanup();return 0;
}
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