使用libcurl库，开发简单的ftp上传工具

#include <unistd.h>   #include <stdlib.h>   #include <stdio.h>   #include <curl/curl.h>   #include <string.h>     int debugFun(CURL* curl, curl_infotype type, char* str, size_t len, void* stream)   {       //只打印CURLINFO_TEXT类型的信息       if(type == CURLINFO_TEXT)       {           fwrite(str, 1, len, (FILE*)stream);       }   }     int main(int argc, char** argv)   {       CURL* curl;       CURLcode res;       char errorBuf[CURL_ERROR_SIZE];       FILE *sendFile, *debugFile;       char ftpurl[256 + 1];       char usrpasswd[64 + 1];              curl_slist *slist=NULL;         if(argc != 7)       {           printf("Usage:\n\t./ftp ip username password ftpPath destFileName srcFile");           return -1;       }         //将相关的调试信息打印到dubugFile.txt中       if(NULL == (debugFile = fopen("debugFile.txt", "a+")))           return -1;         //打开ftp上传的源文件       if(NULL == (sendFile = fopen(argv[6], "r")))       {           fclose(debugFile);           return -1;       }         //获取需要发送文件的大小       fseek(sendFile, 0, SEEK_END);       int sendSize = ftell(sendFile);       if(sendSize < 0)       {           fclose(debugFile);           fclose(sendFile);           return -1;       }       fseek(sendFile, 0L, SEEK_SET);         if((res = curl_global_init(CURL_GLOBAL_ALL)) != 0)       {           fclose(debugFile);           fclose(sendFile);           return -1;       }       if((curl = curl_easy_init()) == NULL)       {           fclose(debugFile);           fclose(sendFile);           curl_global_cleanup();           return -1;       }         if(argv[4][strlen(argv[4]) - 1] != '/')           sprintf(ftpurl, "ftp://%s/%s/%s", argv[1], argv[4], argv[5]);       else          sprintf(ftpurl, "ftp://%s/%s%s", argv[1], argv[4], argv[5]);       curl_easy_setopt(curl, CURLOPT_URL, ftpurl);       //设置ftp上传url,组成如下的URL       //ftp://192.168.31.145//root/subdir/curl/testftp.txt         sprintf(usrpasswd, "%s:%s", argv[2], argv[3]);       curl_easy_setopt(curl, CURLOPT_USERPWD, usrpasswd);         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);       curl_easy_setopt(curl, CURLOPT_DEBUGDATA, debugFile);              curl_easy_setopt(curl, CURLOPT_READDATA, sendFile);        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);       curl_easy_setopt(curl, CURLOPT_INFILESIZE, sendSize);       curl_easy_setopt(curl, CURLOPT_FTP_CREATE_MISSING_DIRS, 1);         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, debugFun);         res = curl_easy_perform(curl);       if(0 != res)       {           fclose(sendFile);           fclose(debugFile);           curl_easy_cleanup(curl);           curl_global_cleanup();           return -1;       }         curl_easy_cleanup(curl);       fclose(sendFile);       fclose(debugFile);         curl_global_cleanup();       return 0;      }  

 

使用示范：

#./ftp 192.168.31.145 user passwd /root/wanghf/curl destFile srcFile

 

下面是debugFile.txt中的信息：

About to connect() to 192.168.31.145 port 21    Trying 192.168.31.145... connected   Connected to 192.168.31.145 (192.168.31.145) port 21  Entry path is '/root'  Connect data stream passively   disabling EPSV usage     Trying 192.168.31.145... connected   Connecting to 192.168.31.145 (192.168.31.145) port 51581  Remembering we are in dir /root/wanghf/curl/   Connection #0 to host 192.168.31.145 left intact   Closing connection #0 

 

刚刚开始学习libcurl库，还有很多的细节不是很熟悉，这个示例很简单，也没有考虑到任何的异常，仅仅能够实现功能，能将文件上传到ftp服务器上，使用该例子，需要开启ftp服务器。

 

文章来源于：http://www.iteye.com/topic/628630