LIBCURL实现FTP上传下载功能
/*****************************************************************************
FTP上传下载功能
*/
#include
#include
#include
#include
/* parse headers for Content-Length */
size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
int r;
long len = 0;
/* _snscanf() is Win32 specific */
//r = _snscanf(ptr, size * nmemb, "Content-Length: %ld/n", &len);
r = sscanf(ptr, "Content-Length: %ld/n", &len);
if (r) /* Microsoft: we don't read the specs */
*((long *) stream) = len;
return size * nmemb;
}
/* discard downloaded data */
size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
return size * nmemb;
}
//write data to upload
size_t writefunc(void *ptr, size_t size, size_t nmemb, void *stream)
{
return fwrite(ptr, size, nmemb, stream);
}
/* read data to upload */
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;
}
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 == NULL) {
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);
curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */
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;
}
}
// 下载
int download(CURL *curlhandle, const char * remotepath, const char * localpath,
long timeout, long tries)
{
FILE *f;
curl_off_t local_file_len = -1 ;
long filesize =0 ;
CURLcode r = CURLE_GOT_NOTHING;
struct stat file_info;
int use_resume = 0;
//获取本地文件大小信息
if(stat(localpath, &file_info) == 0)
{
local_file_len = file_info.st_size;
use_resume = 1;
}
//追加方式打开文件，实现断点续传
f = fopen(localpath, "ab+");
if (f == NULL) {
perror(NULL);
return 0;
}
curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
//连接超时设置
curl_easy_setopt(curlhandle, CURLOPT_CONNECTTIMEOUT, timeout);
//设置头处理函数
curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &filesize);
// 设置断点续传
curl_easy_setopt(curlhandle, CURLOPT_RESUME_FROM_LARGE, use_resume?local_file_len:0);
curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, writefunc);
curl_easy_setopt(curlhandle, CURLOPT_WRITEDATA, f);
curl_easy_setopt(curlhandle, CURLOPT_NOPROGRESS, 1L);
curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
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(int c, char **argv) {
CURL *curlhandle = NULL;
CURL *curldwn = NULL;
curl_global_init(CURL_GLOBAL_ALL);
curlhandle = curl_easy_init();
curldwn = curl_easy_init();
upload(curlhandle, "ftp://ffcs:[email protected]/ipmsg.log", "C://ipmsg.log", 1, 3);
download(curldwn, "ftp://ffcs:[email protected]/2009.txt", "C://id.log", 1, 3);
curl_easy_cleanup(curlhandle);
curl_easy_cleanup(curldwn);
curl_global_cleanup();
return 0;
}