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Posted on 2008-04-26 09:24 HYin 阅读(6006) 评论(2) 编辑 收藏 引用
我们网络实验使用socket实现一个ftp客户端，前几天我一个很困惑一些技术上的问题，因为在网上基本上没有这样的样例，所以我将代码贴了上来，不是完整的代码，只有一个核心部分，我想要实现的就是像QFtp一样的功能，不过还有很多地方要完善。
  /**//*
 * HLftp.h
* \date 2008-04-22
* \author HanYin
 */
#ifndef HL_FTP_H
#define HL_FTP_H
#include "HLutil.h"
#include <QtNetwork>
#include <QString>
class QUrlInfo;
namespace hy
 {
class HLftp : public QObject
  {
Q_OBJECT
public :
explicit HLftp( QObject * parent =NULL );
~HLftp();
enum State {
Unconnected,
HostLookup,
Connecting,
Connected,
LoggingIn,
LoggedIn,
Closing,
Closed
 };
enum Command {
None,
SetTransferMode,
SetProxy,
ConnectToHost,
Login,
Close,
List,
Cd,
Get,
Put,
Remove, // haven't accomplished
Mkdir,
Rmdir,
Rename,
RawCommand
};
enum TransferType {
Binary,
Ascii
};
enum TransferMode {
Active,
Passive
};
public :
/**//**
* Connects to an FTP server and logs in with the supplied username and* password.
*/
int connectToHost( const QString & hostname, uint port = 21 );
/**//**
* logs in with the supplied username and* password.
*/
int login( const QString & username = QString("anonymous"), const QString & password = QString("anonymous") );
/**//**
* Disconnects from the FTP server.
*/
int disconnect();
/**//**
* Get the directory dir of the FTP server it is connected to.
* Default to working directory.
*/
int list( const QString &dir = QString() );
/**//**
* Changes the working directory (like cd). Returns true if successful.
*/
int cwd( const QString & dir );
/**//**
* Enter binary mode for sending binary files.
*/
int bin();
/**//**
* Enter ASCII mode for sending text files. This is usually the default mode.
* Make sure you use binary mode if you are sending images or other binary
* data, as ASCII mode is likely to corrupt them.
*/
int ascii();
/**//**
* Sends a file to be stored on the FTP server.
* The file is sent in passive mode to avoid NAT or
* firewall problems at the client end.
*/
int put( QIODevice *dev, const QString &file );
/**//**
* download a file from the FTP server.
* The file is sent in passive mode to avoid NAT or
* firewall problems at the client end.
*/
int get( const QString &file, QIODevice *dev );
/**//**
* Get information of Server system.
*/
int syst();
/**//**
* Cut down current data link.
*/
int abort();
/**//**
* Set transfer mode.
*/
int setTransferMode( TransferMode mode );
/**//**
* get current state.
*/
State currentState() const;
/**//**
* get current command.
*/
Command currentCommand() const;
/**//**
* get current transfer type.
*/
TransferType currentTransferType() const;
/**//**
* get current transfer type.
*/
void openDebug( bool b )
{ m_bDebug = b; }
signals :
void commandStarted( int id );
void commandFinished( int id, bool error );
void listInfo(const QUrlInfo & url);
void readyRead();
void dataTransferProgress(qint64, qint64); // haven't accomplished.
protected :
/**//**
* Returns the working directory of the FTP server it is connected to.
*/
QString pwd();
/**//**
* Send a raw command to the FTP server.
*/
void sendLine( QString cmd );
/**//**
* Get a raw command to the FTP server.
*/
QString getLine();
private :
QTcpSocket * m_pControlSocket;
QTcpSocket * m_pDataSocket;
State m_eCurrentState;
Command m_eCurrentCommand;
TransferType m_eTransferType;
TransferMode m_eTransferMode;
ServerSystemType m_eServerSystemType;
QString m_sDataIP;
uint m_iDataPort;
bool m_bSetModeSuccess;
// all ids for states.
int connect_id;
int login_id;
int close_id;
int list_id;
int pwd_id;
int cwd_id;
int bin_id;
int ascii_id;
int put_id;
int get_id;
int transfertype_id;
int syst_id;
int abort_id;
// For Debug.
bool m_bDebug;
};
inline HLftp::State HLftp::currentState() const
{
return m_eCurrentState;
}
inline HLftp::Command HLftp::currentCommand() const
{
return m_eCurrentCommand;
}
inline HLftp::TransferType HLftp::currentTransferType() const
{
return m_eTransferType;
}
}
#endif/**//*
* HLftp.cpp
* \date 2008-04-22
* \author HanYin
*/
#include "HLftp.h"
#include <QDataStream>
#include <QUrlInfo>
namespace hy
{
HLftp::HLftp( QObject * parent )
: m_pDataSocket(NULL), m_pControlSocket(NULL)
{
m_bDebug = true;
m_eCurrentState = Unconnected;
m_eCurrentCommand = None;
m_eTransferType = Ascii;
m_eTransferMode = Active;
m_eServerSystemType = SYS_OTHERS;
m_pControlSocket = new QTcpSocket();
// temporarily for this.
connect_id = 100;
login_id = 200;
close_id = 300;
}
HLftp::~HLftp()
{
if ( NULL != m_pControlSocket )
delete m_pControlSocket;
if ( NULL != m_pDataSocket )
delete m_pDataSocket;
}
int HLftp::connectToHost( const QString & hostname, uint port )
{
// if the socket is busy, close it.
if ( m_pControlSocket->isOpen() )
m_pControlSocket->close();
// connect to the host
m_eCurrentState = Connecting;
m_eCurrentCommand = ConnectToHost;
emit commandStarted(connect_id);
m_pControlSocket->connectToHost( hostname, port );
QString response = getLine();
if ( ! response.startsWith("220") )
{
emit commandFinished( connect_id, true ); // connect failure
return connect_id;
}
else
{
emit commandFinished( connect_id, false ); // connect successfully
}
// connect to the host
m_eCurrentState = Connected;
return connect_id;
}
int HLftp::login( const QString & username, const QString & password )
{
// set current state to be logging in.
m_eCurrentState = LoggingIn;
m_eCurrentCommand = Login;
emit commandStarted(login_id);
// send user name and password if needed
sendLine( QObject::tr("USER ") + username );
QString response = getLine();
if ( !response.startsWith("331") && !response.startsWith("230") )
{
emit commandFinished( login_id, true );
return login_id;
}
// if needing password
if ( response.startsWith("331") )
{
sendLine( QObject::tr("PASS ") + password );
response = getLine();
if ( ! response.startsWith("230") )
{
emit commandFinished( login_id, true );
return login_id;
}
else
{
emit commandFinished( login_id, false );
}
}
else
{
emit commandFinished( login_id, false );
}
// set current state to be connected.
m_eCurrentState = LoggedIn;
return login_id;
}
int HLftp::disconnect()
{
// set current state to be closing.
m_eCurrentState = Closing;
m_eCurrentCommand = Close;
emit commandStarted(close_id);
// Aborts the current command and deletes all scheduled commands.
m_pControlSocket->abort();
// Closes the connection to the FTP server.
m_pControlSocket->close();
emit commandFinished( close_id, false );
// set current state to be closing.
m_eCurrentState = Closed;
return close_id;
}
int HLftp::list( const QString &dir )
{
m_eCurrentCommand = List;
// Get directory to be listed.
QString directory = dir;
if ( directory.isEmpty() ) // if empty, current working directory.
{
directory = pwd();
}
// sending command, make it passive.
sendLine("PASV");
QString response = getLine();
if ( ! response.startsWith("227") )
{
emit commandFinished( get_id, true );
return list_id;
}
else
{
m_eTransferMode = Passive;
}
int begin = response.indexOf('(') +1;
int end = response.indexOf( ')', begin );
QString substring = response.mid( begin, end-begin ); // cut out ip and data port.
int i;
QString temp_ip;
temp_ip.clear();
// get IP string.
end =-1;
for ( i=0; i<3; i++ )
{
begin = end +1;
end = substring.indexOf( ',', begin+1 );
temp_ip.append( substring.mid( begin, end-begin ) );
temp_ip.append(".");
}
begin = end +1;
end = substring.indexOf( ',', begin+1 );
temp_ip.append( substring.mid( begin, end-begin ) );
// get port.
uint temp_port =0;
begin = end +1;
end = substring.indexOf( ',', begin );
temp_port = substring.mid( begin, end-begin ).toUInt() * 256;
begin = end +1;
temp_port += substring.mid( begin, -1 ).toUInt();
// Create a new data link from Server to get all lists.
emit commandStarted(list_id);
sendLine( QObject::tr("LIST ") + directory );
m_pDataSocket = new QTcpSocket(this);
m_pDataSocket->connectToHost( temp_ip, temp_port );
m_pDataSocket->write( "USER\r\n", 8 );
response = getLine();
if (! response.startsWith("150") )
{
emit commandFinished( put_id, true );
return list_id;
}
char buffer[500];
int byteRead = 0;
while (true) {
if ( ! m_pDataSocket->waitForReadyRead() )
break;
byteRead = m_pDataSocket->readLine( buffer, 500 );
QString temp_string(buffer);
QUrlInfo url = HLutil::parseFileList( temp_string, m_eServerSystemType );
emit listInfo( url );
}
m_pDataSocket->flush();
m_pDataSocket->close();
delete m_pDataSocket;
response = getLine();
if ( ! response.startsWith("226 ") )
{
emit commandFinished( get_id, true );
}
else
{
emit commandFinished( get_id, false );
}
return list_id;
}
int HLftp::cwd( const QString & dir )
{
m_eCurrentCommand = Cd;
emit commandStarted(cwd_id);
// sending command.
sendLine( QObject::tr("CWD ") + dir );
QString response = getLine();
if ( ! response.startsWith("250") )
{
emit commandFinished( cwd_id, true );
return cwd_id;
}
else
{
emit commandFinished( cwd_id, false );
return cwd_id;
}
}
int HLftp::bin()
{
emit commandStarted(bin_id);
// sending command.
sendLine( QObject::tr("TYPE I") );
QString response = getLine();
if ( ! response.startsWith("200") )
{
m_eTransferType = Binary;
emit commandFinished( bin_id, true );
return bin_id;
}
else
{
emit commandFinished( bin_id, false );
return bin_id;
}
}
int HLftp::ascii()
{
emit commandStarted(ascii_id);
// sending command.
sendLine( QObject::tr("TYPE A") );
QString response = getLine();
if ( ! response.startsWith("200") )
{
m_eTransferType = Ascii;
emit commandFinished( ascii_id, true );
return ascii_id;
}
else
{
emit commandFinished( ascii_id, false );
return ascii_id;
}
}
int HLftp::put(QIODevice *dev, const QString &file )
{
m_eCurrentCommand = Put;
// sending command, make it passive.
sendLine("PASV");
QString response = getLine();
if ( ! response.startsWith("227") )
{
emit commandFinished( put_id, true );
return put_id;
}
else
{
m_eTransferMode = Passive;
}
int begin = response.indexOf('(')+1;
int end = response.indexOf(')', begin);
QString substring = response.mid( begin, end-begin ); // cut out ip and data port.
int i;
QString temp_ip;
temp_ip.clear();
// get IP string.
for ( i=0; i<4; i++ )
{
begin = end +1;
end = substring.indexOf( ',', begin );
temp_ip.append( substring.mid( begin, end-begin ) );
}
// get port.
uint temp_port =0;
begin = end +1;
end = substring.indexOf( ',', begin );
temp_port = substring.mid( begin, end-begin ).toUInt() * 256;
begin = end +2;
temp_port += substring.mid( begin, -1 ).toUInt();
// now set up a new data link use given ip and port.
emit commandStarted(put_id);
sendLine( QObject::tr("STOR ") + file );
m_pDataSocket = new QTcpSocket();
m_pDataSocket->connectToHost( temp_ip, temp_port );
response = getLine();
if (! response.startsWith("150 ") )
{
emit commandFinished( put_id, true );
return put_id;
}
char buffer[4096];
int byteRead = 0;
memset( buffer, 0, 4096 );
while ( ( byteRead = dev->read( buffer, 4096 ) ) != -1 ) {
m_pDataSocket->write( buffer, byteRead );
}
m_pDataSocket->flush();
m_pDataSocket->close();
dev->close();
delete m_pDataSocket;
response = getLine();
if ( ! response.startsWith("226 ") )
{
emit commandFinished( put_id, true );
}
else
{
emit commandFinished( put_id, false );
}
return put_id;
}
int HLftp::get( const QString &file, QIODevice * dev )
{
m_eCurrentCommand = Get;
// sending command, make it passive.
sendLine("PASV");
QString response = getLine();
if ( ! response.startsWith("227") )
{
emit commandFinished( get_id, true );
return list_id;
}
else
{
m_eTransferMode = Passive;
}
int begin = response.indexOf('(') +1;
int end = response.indexOf( ')', begin );
QString substring = response.mid( begin, end-begin ); // cut out ip and data port.
int i;
QString temp_ip;
temp_ip.clear();
// get IP string.
end =-1;
for ( i=0; i<3; i++ )
{
begin = end +1;
end = substring.indexOf( ',', begin+1 );
temp_ip.append( substring.mid( begin, end-begin ) );
temp_ip.append(".");
}
begin = end +1;
end = substring.indexOf( ',', begin+1 );
temp_ip.append( substring.mid( begin, end-begin ) );
// get port.
uint temp_port =0;
begin = end +1;
end = substring.indexOf( ',', begin );
temp_port = substring.mid( begin, end-begin ).toUInt() * 256;
begin = end +1;
temp_port += substring.mid( begin, -1 ).toUInt();
// now set up a new data link use given ip and port.
emit commandStarted(get_id);
sendLine( QObject::tr("RETR ") + file );
m_pDataSocket = new QTcpSocket();
m_pDataSocket->connectToHost( temp_ip, temp_port );
response = getLine();
if (! response.startsWith("150 ") )
{
emit commandFinished( put_id, true );
return put_id;
}
char buffer[4096];
int byteRead = 0;
memset( buffer, 0, 4096 );
while ( m_pDataSocket->waitForReadyRead() ) {
if ( ( byteRead = m_pDataSocket->read( buffer, 4096 ) ) == -1 )
{
break;
}
dev->write( buffer, byteRead );
}
m_pDataSocket->flush();
m_pDataSocket->close();
dev->close();
delete m_pDataSocket;
m_pDataSocket = NULL;
response = getLine();
if ( ! response.startsWith("226 ") )
{
emit commandFinished( get_id, true );
}
else
{
emit commandFinished( get_id, false );
}
return get_id;
}
int HLftp::syst()
{
emit commandStarted(syst_id);
// sending command.
sendLine( QObject::tr("SYST") );
QString response = getLine();
if ( ! response.startsWith("200") )
{
emit commandFinished( syst_id, true );
return syst_id;
}
else
{
emit commandFinished( syst_id, false );
return syst_id;
}
}
int HLftp::abort()
{
if ( NULL != m_pDataSocket )
m_pDataSocket->abort();
return abort_id;
}
QString HLftp::pwd()
{
emit commandStarted(pwd_id);
// send command.
sendLine( QObject::tr("PWD") );
QString response = getLine();
if ( response.startsWith("257") )
{
int opening = response.indexOf('/');
int closing = response.indexOf('\"', opening + 1);
emit commandFinished( pwd_id, false );
QString temp = response.mid( opening, closing-opening );
return temp;
}
else
{
emit commandFinished( pwd_id, true );
return QString();
}
}
QString HLftp::getLine()
{
if ( ! m_pControlSocket->isOpen() )
{
qDebug() << "error : HLftp::getLine() : socket is not open\n" << endl;
return QString();
}
char buffer[500];
m_pControlSocket->waitForReadyRead();
m_pControlSocket->readLine( buffer, 500 );
m_pControlSocket->read(m_pControlSocket->bytesAvailable());
qDebug() << "> get: " << buffer << endl;
return QString(buffer);
}
void HLftp::sendLine( QString cmd )
{
if ( ! m_pControlSocket->isOpen() )
{
qDebug() << "error : HLftp::sendLine( QString cmd ) : socket is not open\n" << endl;
}
m_pControlSocket->waitForBytesWritten();
cmd.append("\r\n");
m_pControlSocket->write( cmd.toStdString().c_str(), cmd.size() );
qDebug() << "> send: " << cmd.toStdString().c_str() << endl;
}
}
下面是一个辅助类，主要是提供一些算法
/**//*
* HLutil.h
* \date 2008-04-22
* \author HanYin
*/
#ifndef HL_UTIL_H
#define HL_UTIL_H
class QString;
class QUrlInfo;
class QStringList;
namespace hy
{
typedef unsigned int UINT;
// Temporarily put here, to be upgraded.
enum ServerSystemType {
SYS_WINDOWS,
SYS_UNIX,
SYS_OTHERS
};
/**//**
* Provide enough.
*/
class HLutil
{
public :
static HLutil * getUtil();
~HLutil();
static QUrlInfo parseFileList( const QString & str, ServerSystemType systemType );
static QStringList seperateString( char sep, const QString & str );
private :
// To make it could not be create by instantiated.
HLutil() {}
HLutil( const HLutil & ) {}
HLutil & operator =( const HLutil & util ) {}
// a static member to control single.
static UINT m_uNum;
static HLutil * m_pInstance;
};
}
#endif
/**//*
* HLutil.cpp
* \date 2008-04-22
* \author HanYin
*/
#include "HLutil.h"
#include <QUrlInfo>
#include <QString>
#include <QChar>
#include <QStringList>
#include <QDebug>
namespace hy
{
UINT HLutil::m_uNum = 0;
HLutil * HLutil::m_pInstance = NULL;
HLutil::~HLutil()
{
if ( NULL != m_pInstance )
{
delete m_pInstance;
m_pInstance = NULL;
m_uNum = 0;
}
}
HLutil * HLutil::getUtil()
{
if ( m_uNum == 0 )
{
m_uNum = 1;
m_pInstance = new HLutil();
}
return m_pInstance;
}
QUrlInfo HLutil::parseFileList( const QString & str, ServerSystemType systemType )
{
QStringList strList = seperateString( ' ', str );
QUrlInfo url;
uint num = strList.size();
if ( num == 4 )
{
if ( strList.at(2).toUpper() == QString("<DIR>").toUpper() )
{
url.setDir(true);
}
else
{
url.setFile(true);
url.setSize( strList.at(2).toUInt() );
}
url.setName( strList.at(3) );
}
else if ( num == 9 || num == 12 )
{
QString temp = strList.at(0);
if ( temp[0]=='d' || temp[0]=='D' )
{
url.setDir(true);
url.setName( strList.at(8) );
}
else if ( temp[0]=='-' )
{
url.setFile(true);
url.setSize( strList.at(4).toUInt() );
url.setName( strList.at(8) );
}
else if ( temp[0]=='l' )
{
url.setSymLink(true);
url.setDir(true);
url.setName( strList.at(11) );
}
else
{
qDebug() << "HLutil::parseFileList( const QString & str, ServerSystemType systemType ) :\n"
"there is unrecognized URL - DIR" << endl;
return QUrlInfo();
}
}
else
{
qDebug() << "HLutil::parseFileList( const QString & str, ServerSystemType systemType ) :\n"
"there is unrecognized SYS_TYPE" << endl;
return QUrlInfo();
}
return url;
}
QStringList HLutil::seperateString( char sep, const QString & str )
{
QStringList strList;
strList.clear();
uint i=0, num = str.size();
QChar ch = str[0];
QString temp_string;
temp_string.clear();
while (true)
{
if ( ch == ' ' || ch == '\t' )
{
if ( ++i == num )
break;
ch = str[i];
continue;
}
temp_string.append(ch);
if ( ++i == num )
break;
ch = str[i];
if ( ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' )
{
strList.append(temp_string);
}
}
return strList;
}
}
Feedback
# re: 使用QTcpSocket实现FTP客户端的一个beta1.0版本(Qt4.3) 回复 更多评论
2008-04-26 23:08 by
# re: 使用QTcpSocket实现FTP客户端的一个beta1.0版本(Qt4.3) 回复 更多评论
2008-04-26 23:08 by
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