Qt socket的文件传输

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QDebug> #include <QFile> #define LOCALE_8_BIT(STR) QString::fromLocal8Bit(STR) MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow), m_tcpServer(NULL), m_tcpSocket(NULL), m_bytesreceived(0), m_bytestotal(0), m_bytesfilenamesize(0) { ui->setupUi(this); ui->btnDisconnect->hide(); this->setWindowTitle(LOCALE_8_BIT("服务端")); m_tcpServer = new QTcpServer(this); m_tcpServer->listen(QHostAddress::Any,520); connect(m_tcpServer,SIGNAL(newConnection()),this,SLOT(Solt_newConnection())); } MainWindow::~MainWindow() { delete ui; delete m_tcpServer; } void MainWindow::Solt_newConnection() { ui->btnDisconnect->show(); m_tcpSocket = m_tcpServer->nextPendingConnection(); connect(m_tcpSocket,SIGNAL(disconnected()),this,SLOT(Solt_disconnected())); connect(m_tcpSocket,SIGNAL(readyRead()),this,SLOT(Slot_readyRead())); } void MainWindow::Solt_disconnected() { ui->btnDisconnect->hide(); m_tcpSocket = NULL; } void MainWindow::Slot_readyRead() { if(m_tcpSocket == NULL) { return; } qint64 readLen = m_tcpSocket->bytesAvailable(); qDebug() << "Slot_readyRead" << readLen; //发送网络数据如果比较小或者网络好就响应一次readyread就可以了，比较大就会响应很多次这里需要if判断 QDataStream dStream(m_tcpSocket); if(m_bytesreceived == 0) //还没接受任何数据 { //如果发送了总大小空间数据 和文件名大小 if(readLen >= sizeof(qint64) * 2) { qDebug() << LOCALE_8_BIT("头数据接收完成"); dStream >> m_bytestotal; dStream >> m_bytesfilenamesize; m_bytesreceived += sizeof(qint64) * 2; //一次性全部接受完 qDebug() << m_bytestotal << m_bytesfilenamesize << m_bytesreceived << readLen; if(readLen + m_bytesreceived >= m_bytestotal) { QString fileName; QByteArray data; dStream >> fileName; dStream >> data; qDebug() << LOCALE_8_BIT("接受完成") << fileName << LOCALE_8_BIT(data); m_bytesreceived = m_bytestotal = m_bytesfilenamesize; QFile file(fileName); if(file.open(QIODevice::WriteOnly)) { file.write(data); file.close(); } } } } else //多次接受 { qDebug() << "n+1:" << readLen + m_bytesreceived << m_bytestotal; if(readLen + m_bytesreceived >= m_bytestotal) { qDebug() << LOCALE_8_BIT("接受完成n+1"); m_bytesreceived = m_bytestotal = m_bytesfilenamesize; QString fileName; QByteArray data; dStream >> fileName; dStream >> data; QFile file(fileName); if(file.open(QIODevice::WriteOnly)) { file.write(data); file.close(); } } } } void MainWindow::on_btnSend_clicked() { } void MainWindow::on_btnDisconnect_clicked() { if(m_tcpSocket == NULL) { return; } m_tcpSocket->close(); }