#include <QtGui>#include <QtNetwork>#include "dialog.h"Dialog::Dialog(QWidget *parent)    : QDialog(parent){    loadSize = 4*1024;    TotalBytes = 0;    bytesWritten = 0;    bytesToWrite = 0;    clientProgressBar = new QProgressBar;    clientStatusLabel = new QLabel(tr("客戶端就緒"));    startButton = new QPushButton(tr("開始"));    quitButton = new QPushButton(tr("退出"));    openButton = new QPushButton (tr("打開"));    startButton->setEnabled(false);    buttonBox = new QDialogButtonBox;    buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);    buttonBox->addButton(openButton, QDialogButtonBox::ActionRole);    buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);    connect(startButton, SIGNAL(clicked()), this, SLOT(start()));    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));    connect(openButton, SIGNAL(clicked()), this, SLOT(openFile()));    connect(&tcpClient, SIGNAL(connected()), this, SLOT(startTransfer()));    connect(&tcpClient, SIGNAL(bytesWritten(qint64)),            this, SLOT(updateClientProgress(qint64)));    connect(&tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),            this, SLOT(displayError(QAbstractSocket::SocketError)));    QVBoxLayout *mainLayout = new QVBoxLayout;    mainLayout->addWidget(clientProgressBar);    mainLayout->addWidget(clientStatusLabel);    mainLayout->addStretch(1);    mainLayout->addSpacing(10);    mainLayout->addWidget(buttonBox);    setLayout(mainLayout);    setWindowTitle(tr("發(fā)送文件"));}void Dialog::start(){    startButton->setEnabled(false);    QApplication::setOverrideCursor(Qt::WaitCursor);    bytesWritten = 0;    clientStatusLabel->setText(tr("連接中..."));    tcpClient.connectToHost(QHostAddress::LocalHost, 16689);}void Dialog::startTransfer(){    localFile = new QFile(fileName);    if (!localFile->open(QFile::ReadOnly )) {        QMessageBox::warning(this, tr("應(yīng)用程序"),                             tr("無法讀取文件 %1:\n%2.")                             .arg(fileName)                             .arg(localFile->errorString()));        return;    }    TotalBytes = localFile->size();    QDataStream sendOut(&outBlock,QIODevice::WriteOnly);    sendOut.setVersion(QDataStream::Qt_4_3);        QString currentFile = fileName.right(fileName.size() - fileName.lastIndexOf('/')-1);    sendOut<<qint64(0)<<qint64(0)<<currentFile;    TotalBytes +=  outBlock.size();    sendOut.device()->seek(0);    sendOut<<TotalBytes<<qint64((outBlock.size()-sizeof(qint64)*2));    bytesToWrite = TotalBytes - tcpClient.write(outBlock);    clientStatusLabel->setText(tr("已連接"));    qDebug()<<currentFile<<TotalBytes;    outBlock.resize(0);}void Dialog::updateClientProgress(qint64 numBytes){    bytesWritten += (int)numBytes;    if (bytesToWrite > 0){    	outBlock = localFile->read(qMin(bytesToWrite, loadSize)); 	bytesToWrite -= (int)tcpClient.write(outBlock);	outBlock.resize(0);        }    else{      	localFile->close();    }    clientProgressBar->setMaximum(TotalBytes);    clientProgressBar->setValue(bytesWritten);    clientStatusLabel->setText(tr("已發(fā)送 %1MB")                               .arg(bytesWritten / (1024 * 1024)));}void Dialog::displayError(QAbstractSocket::SocketError socketError){    if (socketError == QTcpSocket::RemoteHostClosedError)        return;    QMessageBox::information(this, tr("網(wǎng)絡(luò)"),                             tr("產(chǎn)生如下錯誤: %1.")                             .arg(tcpClient.errorString()));    tcpClient.close();    clientProgressBar->reset();    clientStatusLabel->setText(tr("客戶端就緒"));    startButton->setEnabled(true);    QApplication::restoreOverrideCursor();}void Dialog::openFile(){    fileName = QFileDialog::getOpenFileName(this);        if (!fileName.isEmpty())            startButton->setEnabled(true);	    }