FTP客户端:FTP Client:win32 console appplication

最新推荐文章于 2025-05-09 09:16:17 发布

武汉小锋

最新推荐文章于 2025-05-09 09:16:17 发布

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CC 4.0 BY-SA版权

文章标签： buffer socket iostream stream file office

本文链接：https://blog.youkuaiyun.com/woshipangxiaofeng/article/details/5385838

本文介绍了一个简单的FTP客户端程序的实现过程，使用C++语言，并通过WinSock进行网络通信。该客户端可以连接到FTP服务器，发送用户名和密码进行身份验证，请求文件大小并下载指定文件。

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#include

"stdafx.h"

#include

"iostream"

#include

<WinSock2.h>

#include

<IO.h>

using

namespace std;

#pragma

comment(lib,"ws2_32.lib")

int

main()

{

WORD wVersionRequested;

WSADATA wsaData;

int

err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );

( err != 0 )

{

return

-1;

}

( LOBYTE( wsaData.wVersion ) != 1 ||

HIBYTE( wsaData.wVersion ) != 1 )

{

WSACleanup( );

return

-1;

}

SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addrSrv;

addrSrv.sin_addr.S_un.S_addr=inet_addr(

"127.0.0.1"

);

addrSrv.sin_family = AF_INET;

addrSrv.sin_port = htons(21);

int

b = connect(sockClient, (SOCKADDR*)&addrSrv,

sizeof

(SOCKADDR));

(b == SOCKET_ERROR)

{

cout<<

"fail"

<<endl;

}

char

recvBuf[100];

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

//send the user name

char

buffer[256];

memset(buffer,0,256);

strcpy(buffer,

"USER "

);

strcat(buffer,

"username"

);

strcat(buffer,

"/r/n"

);

send(sockClient,buffer + 0, strlen(buffer), 0);

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

//send the password

memset(buffer,0,256);

strcpy(buffer,

"PASS "

);

strcat(buffer,

"password"

);

strcat(buffer,

"/r/n"

);

send(sockClient,buffer + 0, strlen(buffer), 0);

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

//tell server the file should be downloaded

memset(buffer,0,256);

strcpy(buffer,

"SIZE "

);

strcat(buffer,

"OFFICE12.exe"

);

strcat(buffer,

"/r/n"

);

send(sockClient,buffer + 0, strlen(buffer), 0);

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

memset(buffer,0,256);

sprintf(buffer,

"PASV/r/n"

);

send(sockClient,buffer + 0, strlen(buffer), 0);

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

const char

* pdir;

pdir=strchr(recvBuf,

'('

);

pdir++;

printf(

"%s"

,pdir);

union

{

unsigned char

b[4];

unsigned __int32

ui;

}uip;

union

{

unsigned char

b[2];

unsigned __int16

hi;

}uport;

unsigned __int32

u32[6];

sscanf(pdir,

"%u,%u,%u,%u,%u,%u"

,&u32[0],&u32[1],&u32[2],&u32[3],&u32[4],&u32[5],&u32[6]);

uip.b[3] = (

unsigned char

)u32[0];

uip.b[2] = (

unsigned char

)u32[1];

uip.b[1] = (

unsigned char

)u32[2];

uip.b[0] = (

unsigned char

)u32[3];

uport.b[1] = (

unsigned char

)u32[4];

uport.b[0] = (

unsigned char

)u32[5];

// send the command to receive the file

memset(buffer,0,256);

sprintf(buffer,

"RETR %s/r/n","OFFICE12.exe"

);

send(sockClient,buffer + 0, strlen(buffer), 0);

memset(recvBuf, 0, 100);

recv(sockClient,recvBuf,100,0);

cout<<recvBuf<<endl;

SOCKET sockFile = socket(AF_INET, SOCK_STREAM, 0);

sockaddr_in myaddr;

memset(&myaddr, 0,

sizeof

(sockaddr_in));

myaddr.sin_family = AF_INET;

myaddr.sin_addr.S_un.S_addr = htonl(uip.ui);

myaddr.sin_port = htons(uport.hi);

b = connect(sockFile, (LPSOCKADDR)&myaddr, (

int)sizeof

(sockaddr_in));

(b == SOCKET_ERROR)

{

cout<<

"fail"

<<endl;

}

char

buffer1[4*4096];

//16KB

int

iresult = 0;

memset(buffer1,0,4*4096);

int

index = 0;

FILE* file=fopen(

"D://OFFICE12.exe","wb"

);

while

(true

)

{

++index;

iresult = recv(sockFile, buffer1, 4*4096, 0);

(iresult == 0)

{

break

;

}

fwrite(buffer1,

sizeof(char

),iresult,file);

}

cout<<index<<endl;

closesocket(sockClient);

WSACleanup();

cin.get();

return

}