Qt用FTP进行上传下载

2013-04-09 11:03:59 1k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

qt FTP客户端编程三、FTP客户端编程在Qt中，QFtp类为我们实现了FTP协议的客户端所需要的功能，比如它不仅提供了完成最常用的各种FTP操作的函数，还能执行任意的FTP命令。需要注意，QFtp类以异步方式工作，比如当我们调用诸如get()或者put()函数时，会立即返回，当控制权返还给Qt的事件循环后，方才进行数据传输。这样做的好处是，当FTP命令执行过程中，用户界面仍能对客户的动作作出迅速的响应。现在，我们将用实例来说明如何利用get()来检索一个文件。我们的示例是一个控制台程序，名为myftp 阅读详情

#include "ftpclient.h"

#include "ui_ftpclient.h"

#include <QString>

#include <QMessageBox>

#include <QtGui>



FtpClient::FtpClient(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::FtpClient)

{

    ui->setupUi(this);

    LabelServer=new QLabel(tr("服务器："));                //192.168.108.6

    LabelUser=new QLabel(tr("用户名："));

    LabelPassword=new QLabel(tr("密码："));            //ft4w685Y

    PushButtonLogin=new QPushButton;

    PushButtonPut=new QPushButton;

    PushButtonGet=new QPushButton;

    PushButtonLogin->setText(tr("登录"));

    PushButtonPut->setText(tr("上传"));

    PushButtonGet->setText(tr("下载"));



    LineEditServer=new QLineEdit;

    QHBoxLayout *layout1=new QHBoxLayout;

    layout1->addWidget(LabelServer);

    layout1->addWidget(LineEditServer);



    LineEditUser=new QLineEdit;

    QHBoxLayout *layout2=new QHBoxLayout;

    layout2->addWidget(LabelUser);

    layout2->addWidget(LineEditUser);



    LineEditPassword=new QLineEdit;

    QHBoxLayout *layout3=new QHBoxLayout;

    layout3->addWidget(LabelPassword);

    layout3->addWidget(LineEditPassword);



    QHBoxLayout *layout4=new QHBoxLayout;

    layout4->addWidget(PushButtonPut);

    layout4->addWidget(PushButtonGet);



    QVBoxLayout *mainlayout=new QVBoxLayout;

    mainlayout->addLayout(layout1);

    mainlayout->addLayout(layout2);

    mainlayout->addLayout(layout3);

    mainlayout->addWidget(PushButtonLogin);

    mainlayout->addLayout(layout4);

    setLayout(mainlayout);

    PushButtonPut->setEnabled(false);

    PushButtonGet->setEnabled(false);

    connect(PushButtonLogin,SIGNAL(clicked()),this,SLOT(slotLogin()));

    connect(PushButtonPut,SIGNAL(clicked()),this,SLOT(slotPut()));

    connect(PushButtonGet,SIGNAL(clicked()),this,SLOT(slotGet()));

}



FtpClient::~FtpClient()

{

    delete ui;

}



void FtpClient::slotLogin()

{

    QString serverAddress = LineEditServer->text();

    if(serverAddress.isEmpty())

    {

        QMessageBox::warning(this,tr("error"),tr("Please input server address!"));

        return;

    }

    QString userName=LineEditUser->text();

    if(userName.isEmpty())

    {

        QMessageBox::warning(this,tr("error"),tr("Please input user name!"));

        return;

    }

    QString password=LineEditPassword->text();

    ftpClient=new QFtp();

    ftpClient->connectToHost(serverAddress);



    connect(ftpClient,SIGNAL(stateChanged(int)),this,SLOT(slotStateChanged(int)));

    connect(ftpClient,SIGNAL(done(bool)),this,SLOT(slotDone(bool)));



    ftpClient->login(userName,password);

    curStatus=LOGIN;

}



void FtpClient::slotStateChanged(int state)

{

    if(state==QFtp::LoggedIn)

    {

        PushButtonPut->setEnabled(true);

        PushButtonGet->setEnabled(true);

    }

}



void FtpClient::slotPut()

{

    bool ok;

    QString fileName=QInputDialog::getText(this,tr("Put File:"),

            tr("Please input file name:"),QLineEdit::Normal,QString(),&ok);

    if(ok&&!fileName.isEmpty())

    {

        QFile *remoteFileName=new QFile(fileName);

        ftpClient->put(remoteFileName,fileName);

//        QFile *dataFile=new QFile("filename");

//        dataFile->open(QIODevice::ReadOnly);

//        ftpClient->put(dataFile,"filename");

    }

    curStatus=PUT;

}



void FtpClient::slotGet()

{

    bool ok;

    QString fileName=QInputDialog::getText(this,tr("Get File:"),

            tr("Please input file name:"),QLineEdit::Normal,QString(),&ok);

    if(ok&&!fileName.isEmpty())

    {

        localFile=new QFile(fileName);

        localFile->open(QIODevice::WriteOnly);

        ftpClient->get(fileName,localFile);

    }

    curStatus=GET;

}



void FtpClient::slotDone(bool error)

{

    if(error)

    {

        QMessageBox::warning(this,tr("error"),ftpClient->errorString());

        return;

    }

    if(curStatus==LOGIN)

    {

        PushButtonLogin->setEnabled(false);

        curStatus=None;

    }

    if(curStatus==PUT)

    {

        QMessageBox::warning(this,tr("succeed"),tr("Put file succeed!"));

        curStatus=None;

    }

    if(curStatus==GET)

    {

        localFile->close();

        QMessageBox::warning(this,tr("succeed"),tr("Get file succeed!"));

        curStatus=None;

    }

}

最主要的问题是，上传文件的函数slotPut()，无论怎样都上传不了文件。在工程文件夹下随便一个记事本，上传时写这记事本的文件名也上传不了。难道Qt写文件上传不能像php一样一个<input type="file">就有一个控件能点，浏览整个计算机的文件后选择一个文件上传？

还有，下载那块是能下载，但却是直接下载到工程文件夹下的，也不能选择下载到具体电脑的哪个位置。应该是put()和get()函数只能这样吧？能用别的函数吗？

求具体实例代码啊~~

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