你们不看Qt里的example吗 Qt/example/network/ftp
#ifndef FTPWINDOW_H
#define FTPWINDOW_H
#include <QDialog>
#include <QHash>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QFile;
class QFtp;
class QLabel;
class QLineEdit;
class QTreeWidget;
class QTreeWidgetItem;
class QProgressDialog;
class QPushButton;
class QUrlInfo;
QT_END_NAMESPACE
class FtpWindow : public QDialog
{
Q_OBJECT
public:
FtpWindow(QWidget *parent = 0);
QSize sizeHint() const;
//![0]
private slots:
void connectOrDisconnect();
void downloadFile();
void cancelDownload();
void ftpCommandFinished(int commandId, bool error);
void addToList(const QUrlInfo &urlInfo);
void processItem(QTreeWidgetItem *item, int column);
void cdToParent();
void updateDataTransferProgress(qint64 readBytes,
qint64 totalBytes);
void enableDownloadButton();
//![0]
private:
QLabel *ftpServerLabel;
QLineEdit *ftpServerLineEdit;
QLabel *statusLabel;
QTreeWidget *fileList;
QPushButton *cdToParentButton;
QPushButton *connectButton;
QPushButton *downloadButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QProgressDialog *progressDialog;
//![1]
QHash<QString, bool> isDirectory;
QString currentPath;
QFtp *ftp;
QFile *file;
//![1]
};
#endif
#include <QtGui>
#include <QtNetwork>
#include "ftpwindow.h"
FtpWindow::FtpWindow(QWidget *parent)
: QDialog(parent), ftp(0)
{
ftpServerLabel = new QLabel(tr("Ftp &server:"));
ftpServerLineEdit = new QLineEdit("ftp.trolltech.com");
ftpServerLabel->setBuddy(ftpServerLineEdit);
statusLabel = new QLabel(tr("Please enter the name of an FTP server."));
fileList = new QTreeWidget;
fileList->setEnabled(false);
fileList->setRootIsDecorated(false);
fileList->setHeaderLabels(QStringList() << tr("Name") << tr("Size") << tr("Owner") << tr("Group") << tr("Time"));
fileList->header()->setStretchLastSection(false);
connectButton = new QPushButton(tr("Connect"));
connectButton->setDefault(true);
cdToParentButton = new QPushButton;
cdToParentButton->setIcon(QPixmap(":/images/cdtoparent.png"));
cdToParentButton->setEnabled(false);
downloadButton = new QPushButton(tr("Download"));
downloadButton->setEnabled(false);
quitButton = new QPushButton(tr("Quit"));
buttonBox = new QDialogButtonBox;
buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
progressDialog = new QProgressDialog(this);
connect(fileList, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
this, SLOT(processItem(QTreeWidgetItem *, int)));
connect(fileList, SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),
this, SLOT(enableDownloadButton()));
connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));
connect(connectButton, SIGNAL(clicked()), this, SLOT(connectOrDisconnect()));
connect(cdToParentButton, SIGNAL(clicked()), this, SLOT(cdToParent()));
connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
QHBoxLayout *topLayout = new QHBoxLayout;
topLayout->addWidget(ftpServerLabel);
topLayout->addWidget(ftpServerLineEdit);
topLayout->addWidget(cdToParentButton);
topLayout->addWidget(connectButton);
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addLayout(topLayout);
mainLayout->addWidget(fileList);
mainLayout->addWidget(statusLabel);
mainLayout->addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr("FTP"));
}
QSize FtpWindow::sizeHint() const
{
return QSize(500, 300);
}
//![0]
void FtpWindow::connectOrDisconnect()
{
if (ftp) {
ftp->abort();
ftp->deleteLater();
ftp = 0;
//![0]
fileList->setEnabled(false);
cdToParentButton->setEnabled(false);
downloadButton->setEnabled(false);
connectButton->setEnabled(true);
connectButton->setText(tr("Connect"));
#ifndef QT_NO_CURSOR
setCursor(Qt::ArrowCursor);
#endif
return;
}
#ifndef QT_NO_CURSOR
setCursor(Qt::WaitCursor);
#endif
//![1]
ftp = new QFtp(this);
connect(ftp, SIGNAL(commandFinished(int, bool)),
this, SLOT(ftpCommandFinished(int, bool)));
connect(ftp, SIGNAL(listInfo(const QUrlInfo &)),
this, SLOT(addToList(const QUrlInfo &)));
connect(ftp, SIGNAL(dataTransferProgress(qint64, qint64)),
this, SLOT(updateDataTransferProgress(qint64, qint64)));
fileList->clear();
currentPath.clear();
isDirectory.clear();
//![1]
//![2]
QUrl url(ftpServerLineEdit->text());
if (!url.isValid() || url.scheme().toLower() != QLatin1String("ftp")) {
ftp->connectToHost(ftpServerLineEdit->text(), 21);
ftp->login();
} else {
ftp->connectToHost(url.host(), url.port(21));
if (!url.userName().isEmpty())
ftp->login(QUrl::fromPercentEncoding(url.userName().toLatin1()), url.password());
else
ftp->login();
if (!url.path().isEmpty())
ftp->cd(url.path());
}
//![2]
fileList->setEnabled(true);
connectButton->setEnabled(false);
connectButton->setText(tr("Disconnect"));
statusLabel->setText(tr("Connecting to FTP server %1...")
.arg(ftpServerLineEdit->text()));
}
//![3]
void FtpWindow::downloadFile()
{
QString fileName = fileList->currentItem()->text(0);
//![3]
//
if (QFile::exists(fileName)) {
QMessageBox::information(this, tr("FTP"),
tr("There already exists a file called %1 in "
"the current directory.")
.arg(fileName));
return;
}
//![4]
file = new QFile(fileName);
if (!file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, tr("FTP"),
tr("Unable to save the file %1: %2.")
.arg(fileName).arg(file->errorString()));
delete file;
return;
}
ftp->get(fileList->currentItem()->text(0), file);
progressDialog->setLabelText(tr("Downloading %1...").arg(fileName));
downloadButton->setEnabled(false);
progressDialog->exec();
}
//![4]
//![5]
void FtpWindow::cancelDownload()
{
ftp->abort();
}
//![5]
//![6]
void FtpWindow::ftpCommandFinished(int, bool error)
{
#ifndef QT_NO_CURSOR
setCursor(Qt::ArrowCursor);
#endif
if (ftp->currentCommand() == QFtp::ConnectToHost) {
if (error) {
QMessageBox::information(this, tr("FTP"),
tr("Unable to connect to the FTP server "
"at %1. Please check that the host "
"name is correct.")
.arg(ftpServerLineEdit->text()));
connectOrDisconnect();
return;
}
statusLabel->setText(tr("Logged onto %1.")
.arg(ftpServerLineEdit->text()));
fileList->setFocus();
downloadButton->setDefault(true);
connectButton->setEnabled(true);
return;
}
//![6]
//![7]
if (ftp->currentCommand() == QFtp::Login)
ftp->list();
//![7]
//![8]
if (ftp->currentCommand() == QFtp::Get) {
if (error) {
statusLabel->setText(tr("Canceled download of %1.")
.arg(file->fileName()));
file->close();
file->remove();
} else {
statusLabel->setText(tr("Downloaded %1 to current directory.")
.arg(file->fileName()));
file->close();
}
delete file;
enableDownloadButton();
progressDialog->hide();
//![8]
//![9]
} else if (ftp->currentCommand() == QFtp::List) {
if (isDirectory.isEmpty()) {
fileList->addTopLevelItem(new QTreeWidgetItem(QStringList() << tr("<empty>")));
fileList->setEnabled(false);
}
}
//![9]
}
//![10]
void FtpWindow::addToList(const QUrlInfo &urlInfo)
{
QTreeWidgetItem *item = new QTreeWidgetItem;
item->setText(0, urlInfo.name());
item->setText(1, QString::number(urlInfo.size()));
item->setText(2, urlInfo.owner());
item->setText(3, urlInfo.group());
item->setText(4, urlInfo.lastModified().toString("MMM dd yyyy"));
QPixmap pixmap(urlInfo.isDir() ? ":/images/dir.png" : ":/images/file.png");
item->setIcon(0, pixmap);
isDirectory[urlInfo.name()] = urlInfo.isDir();
fileList->addTopLevelItem(item);
if (!fileList->currentItem()) {
fileList->setCurrentItem(fileList->topLevelItem(0));
fileList->setEnabled(true);
}
}
//![10]
//![11]
void FtpWindow::processItem(QTreeWidgetItem *item, int /*column*/)
{
QString name = item->text(0);
if (isDirectory.value(name)) {
fileList->clear();
isDirectory.clear();
currentPath += "/" + name;
ftp->cd(name);
ftp->list();
cdToParentButton->setEnabled(true);
#ifndef QT_NO_CURSOR
setCursor(Qt::WaitCursor);
#endif
return;
}
}
//![11]
//![12]
void FtpWindow::cdToParent()
{
#ifndef QT_NO_CURSOR
setCursor(Qt::WaitCursor);
#endif
fileList->clear();
isDirectory.clear();
currentPath = currentPath.left(currentPath.lastIndexOf('/'));
if (currentPath.isEmpty()) {
cdToParentButton->setEnabled(false);
ftp->cd("/");
} else {
ftp->cd(currentPath);
}
ftp->list();
}
//![12]
//![13]
void FtpWindow::updateDataTransferProgress(qint64 readBytes,
qint64 totalBytes)
{
progressDialog->setMaximum(totalBytes);
progressDialog->setValue(readBytes);
}
//![13]
//![14]
void FtpWindow::enableDownloadButton()
{
QTreeWidgetItem *current = fileList->currentItem();
if (current) {
QString currentFile = current->text(0);
downloadButton->setEnabled(!isDirectory.value(currentFile));
} else {
downloadButton->setEnabled(false);
}
}
int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(ftp);
QApplication app(argc, argv);
FtpWindow ftpWin;
ftpWin.show();
return ftpWin.exec();
}
