2019独角兽企业重金招聘Python工程师标准>>> 
由于项目的需要，利用libcurl编写程序与ftp服务器通信，进行文件上传或下载，愈发地感到curl功能的强悍。其实在命令行下直接使用curl命令就可以完成这些功能，但是需要获取上传下载行为的状态以便更好地控制。直接上代码：
//ftp-manager.h
#ifndef _FTP_MANAGER_H_
#define _FTP_MANAGER_H_
/*FTP OPERATION CODE*/
typedef enum FTP_STATE
{
FTP_UPLOAD_SUCCESS,
FTP_UPLOAD_FAILED,
FTP_DOWNLOAD_SUCCESS,
FTP_DOWNLOAD_FAILED
}FTP_STATE;
/*FTP OPERATIONS OPTIONS*/
typedef struct FTP_OPT
{
char *url; /*url of ftp*/
char *user_key; /*username:password*/
char *file; /*filepath*/
}FTP_OPT;
#ifdef __cplusplus
extern "C" {
#endif
/*upload file to ftp server*/
FTP_STATE ftp_upload(const FTP_OPT ftp_option);
/*download file from ftp server*/
FTP_STATE ftp_download(const FTP_OPT ftp_option);
#ifdef __cplusplus
}
#endif
#endif
//ftp-manager.c
#include
#include
#include
#include "ftp-manager.h"
/*****************util api******************/
int get_file_size(FILE *file)
{
int size = 0;
fseek(file, 0L, SEEK_END);
size = ftell(file);
fseek(file, 0L, SEEK_SET);
return size;
}
/******************curl api****************/
CURL *curl_init()
{
curl_global_init(CURL_GLOBAL_DEFAULT);
CURL *curl = curl_easy_init();
if(NULL == curl)
{
fprintf(stderr, "Init curl failed.\n");
exit(1);
}
return curl;
}
void curl_set_upload_opt(CURL *curl, const char *url, const char *user_key, FILE *file)
{
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_USERPWD, user_key);
curl_easy_setopt(curl, CURLOPT_READDATA, file);
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
curl_easy_setopt(curl, CURLOPT_INFILESIZE, get_file_size(file));
curl_easy_setopt(curl, CURLOPT_FTP_CREATE_MISSING_DIRS, 1);
// curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
}
void curl_set_download_opt(CURL *curl, const char *url, const char *user_key, FILE *file)
{
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_USERPWD, user_key);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, file);
// curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
}
void curl_exit(CURL *curl)
{
curl_easy_cleanup(curl);
curl_global_cleanup();
}
CURLcode curl_perform(CURL *curl)
{
CURLcode ret = curl_easy_perform(curl);
if(ret != 0)
{
fprintf(stderr, "Perform curl failed.\n");
curl_exit(curl);
exit(1);
}
return ret;
}
/****************ftp upload & download api******************/
FTP_STATE ftp_upload(const FTP_OPT ftp_option)
{
FTP_STATE state;
CURL *curl;;
FILE *fp = fopen(ftp_option.file, "r");
if(NULL == fp)
{
fprintf(stderr, "Open file failed at %s:%d\n", __FILE__, __LINE__);
return FTP_UPLOAD_FAILED;
}
curl = curl_init();
curl_set_upload_opt(curl, ftp_option.url, ftp_option.user_key, fp);
if(CURLE_OK == curl_perform(curl))
state = FTP_UPLOAD_SUCCESS;
else
state = FTP_UPLOAD_FAILED;
curl_exit(curl);
fclose(fp);
return state;
}
FTP_STATE ftp_download(const FTP_OPT ftp_option)
{
FTP_STATE state;
CURL *curl;
FILE *fp = fopen(ftp_option.file, "w");
if(NULL == fp)
{
fprintf(stderr, "Open file failed at %s:%d\n", __FILE__, __LINE__);
return FTP_UPLOAD_FAILED;
}
curl = curl_init();
curl_set_download_opt(curl, ftp_option.url, ftp_option.user_key, fp);
if(CURLE_OK == curl_perform(curl))
state = FTP_DOWNLOAD_SUCCESS;
else
state = FTP_DOWNLOAD_FAILED;
curl_exit(curl);
fclose(fp);
return state;
}
//test.c
#include
#include "ftp-manager.h"
int main()
{
FTP_OPT ftp_opt;
ftp_opt.url = "ftp://127.0.0.1//var/ftp/upload.txt";
ftp_opt.user_key = "xxx:xxx";
ftp_opt.file = "/home/xxx/project/ftpManager/upload.txt";
if(FTP_UPLOAD_SUCCESS == ftp_upload(ftp_opt))
printf("Upload success.\n");
else
printf("Upload failed.\n");
ftp_opt.url = "ftp://127.0.0.1//var/ftp/download.txt";
ftp_opt.file = "/home/xxx/project/ftpManager/download.txt";
if(FTP_DOWNLOAD_SUCCESS == ftp_download(ftp_opt))
printf("Download success.\n");
else
printf("Download failed.\n");
return 0;
}