code

// Client.cpp : 定義控制臺應用程序的入口點。

//

#include "stdafx.h"

#include

#include

#include

#pragma comment(lib,"WS2_32.lib")

using namespace std;

#define PORT 21//FTP端口

#define IP_ADDR "x.x.x.x"//主機地址

int getPortNum(char* buf);

bool executeFTPCmd(SOCKET controlSocket, char* buf, int len, int stateCode);

int getStateCode(char* buf);

int main()

{

WSADATA dat;

SOCKET controlSocket, dataSocket;

SOCKADDR_IN serverAddr;

int dataPort, ret, stateCode;

char buf[100]={0}, sendBuf[1024]={0};

//初始化，很重要

if (WSAStartup(MAKEWORD(2,2),&dat)!=0)//Windows Sockets Asynchronous啟動

{

cout<

system("pause");

return -1;

}

//創建Socket

controlSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

if(controlSocket==INVALID_SOCKET)

{

cout<

system("pause");

return -1;

}

//構建服務器訪問參數結構體

serverAddr.sin_family=AF_INET;

serverAddr.sin_addr.S_un.S_addr=inet_addr(IP_ADDR);//地址

serverAddr.sin_port=htons(PORT);//端口

memset(serverAddr.sin_zero,0,sizeof(serverAddr.sin_zero));

//連接

ret=connect(controlSocket,(struct sockaddr*)&serverAddr,sizeof(serverAddr));

if(ret==SOCKET_ERROR)

{

cout<

system("pause");

return -1;

}

cout<

//接收返回狀態信息

recv(controlSocket,buf,100,0);

cout<

//根據返回信息提取狀態碼，進行判斷

if(getStateCode(buf) != 220)

{

cout<

system("pause");

exit(-1);

}

//用戶名

memset(buf,0,100);

sprintf(buf,"USER %s\r\n","xxxx");

executeFTPCmd(controlSocket, buf, 100, 331);//331

//密碼

memset(buf,0,100);

sprintf(buf,"PASS %s\r\n","xxxx");

executeFTPCmd(controlSocket, buf, 100, 230);//230

//=======================================

//切換到被動模式

memset(buf,0,100);

sprintf(buf,"PASV\r\n");

executeFTPCmd(controlSocket, buf, 100, 227);//227

//返回的信息格式為---h1,h2,h3,h4,p1,p2

//其中h1,h2,h3,h4為服務器的地址，p1*256+p2為數據端口

dataPort=getPortNum(buf);

//客戶端數據傳輸socket

dataSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

serverAddr.sin_port=htons(dataPort);//更改連接參數中的port值

ret=connect(dataSocket,(struct sockaddr*)&serverAddr,sizeof(serverAddr));

if(ret==SOCKET_ERROR)

{

cout<

system("pause");

return -1;

}

cout<

//更改當前目錄

memset(buf,0,100);

sprintf(buf,"CWD %s\r\n","/ftpxxxx/web/monitor");//250

executeFTPCmd(controlSocket, buf, 100, 250);

//上傳文件

memset(buf,0,100);

sprintf(buf,"STOR %s\r\n","1.jpg");

executeFTPCmd(controlSocket, buf, 100, 125);//125

FILE* f=fopen("1.jpg","rb");

if(f==NULL)

{

cout<

cout<

exit(-1);

}

while( !feof(f) )

{

fread(sendBuf, 1, 1024, f);

send(dataSocket, sendBuf, 1024, 0);

}

fclose(f);

//釋放資源

closesocket(dataSocket);

closesocket(controlSocket);

WSACleanup();

system("pause");

return 0;

}

//從返回信息“227 Entering Passive Mode (182,18,8,37,10,25).”中

//獲取數據端口

int getPortNum(char* buf)

{

int num1=0,num2=0;

char* p=buf;

int cnt=0;

while( 1 )

{

if(cnt == 4 && (*p) != ',')

{

num1 = 10*num1+(*p)-'0';

}

if(cnt == 5)

{

num2 = 10*num2+(*p)-'0';

}

if((*p) == ',')

{

cnt++;

}

p++;

if((*p) == ')')

{

break;

}

}

cout<

return num1*256+num2;

}

//通過控制socket執行FTP命令

bool executeFTPCmd(SOCKET controlSocket, char* buf, int len, int stateCode)

{

send(controlSocket, buf, len, 0);

memset(buf, 0, len);

recv(controlSocket, buf, 100, 0);

cout<

if(getStateCode(buf) == stateCode)

{

return true;

}

else

{

cout<

return false;

}

}

//從返回信息中獲取狀態碼

int getStateCode(char* buf)

{

int num=0;

char* p=buf;

while(p != NULL)

{

num=10*num+(*p)-'0';

p++;

if(*p==' ')

{

break;

}

}

return num;

}

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