libcurl ftp下载实例
来源：互联网 发布：淘宝号购买 编辑：程序博客网 时间：2024/05/29 18:23
从ftp站点下载文件的例子.
view plaincopy to clipboardprint?
#include <stdio.h>;
#include < curl/curl.h>;
#include <curl/types.h>;
#include < curl/easy.h>;
struct FtpFile //定义一个结构为了传递给my_fwrite函数.可用curl_easy_setopt的CURLOPT_WRITEDATA选项传递
{
char *filename;
FILE *stream;
};
int my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream)
{
struct FtpFile *out=(struct FtpFile *)stream; // stream指针其实就是 指向struct FtpFile ftpfile的
if(out && !out->stream)
{
out->stream=fopen(out->filename, "wb"); //没有这个流的话就创建一个 名字是out->filename.
if(!out->stream)
return -1;
}
return fwrite(buffer, size, nmemb, out->stream);
}
int main(int argc, char *argv[])
{
CURL *curl;
CURLcode res;
struct FtpFile ftpfile={argv[2],NULL}; //初始化一个FtpFile结构
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if(curl)
{
curl_easy_setopt(curl, CURLOPT_URL,argv[1]);
curl_easy_setopt(curl, CURLOPT_USERPWD,"user:passwd");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile); //给相关函数的第四个参数 传递一个结构体的指针
curl_easy_setopt(curl, CURLOPT_VERBOSE, TRUE); //CURLOPT_VERBOSE 这个选项很常用 用来在屏幕上显示对服务器相关操作返回的信息
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
if(CURLE_OK != res)
fprintf(stderr, "curl told us %d/n", res);
}
if(ftpfile.stream)
fclose(ftpfile.stream);
curl_global_cleanup();
return 0;
}
/*****************************************************************************
FTP上传下载功能
*/
#include <stdlib.h>
#include <stdio.h>
#include <curl/curl.h>
#include <sys/stat.h>
/* 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:ffcs@135.125.97.42/ipmsg.log", "C://ipmsg.log", 1, 3);
download(curldwn, "ftp://ffcs:ffcs@135.125.97.42/2009.txt", "C://id.log", 1, 3);
curl_easy_cleanup(curlhandle);
curl_easy_cleanup(curldwn);
curl_global_cleanup();
return 0;
}
- libcurl ftp下载实例
- libcurl ftp下载实例
- Libcurl 从FTP服务器下载
- libcurl之ftp上传 & 下载 （转）
- libcurl 下载ftp服务器全部文件
- libcurl 下载ftp服务器全部文件
- FTP下载文件实例
- libcurl 库的ftp上传和下载代码
- libcurl 库的ftp上传和下载代码
- libcurl 库的ftp上传和下载代码
- libcurl 库的ftp上传和下载代码
- libcurl 库的ftp上传和下载代码
- libcurl官方实例代码（HTTP,FTP,上传下载等等）
- libcurl (ftp)库
- libcurl 实现ftp客户端不支持下载size大小为0文件----半吊子解决方案
- qt5集成libcurl实现tftp和ftp的方法之四：实现ftp文件上传和下载
- LIBCURL实现FTP上传下载功能
- 小记 libcurl下载
- Linux 上的TC 流量控制几个例子（80端口流量限制）
- sql 函数练习
- web服务器关机的原因之一
- Java 异步方法转同步
- The document "MainStoryboard.storyboard" could not be opened. Could not read archive.
- libcurl ftp下载实例
- ScrollView中的LinearLayout不能fill_parent
- 45度角Tile地图通过具体位置获得地图的行列数详解
- ListView实现漂亮的自定义表格实例
- Swift和keystone认证服务器结合实现多租户
- 蓝桥杯 C++ 5位正整数倒叙输出
- “摧龙八式——成功销售的八个步骤”笔记（下）
- cocos2d-x中CCNode的init和onEnter
- 课外....
