怎么用QT制作一个简易的传输文件小工具

本篇内容主要讲解“怎么用QT制作一个简易的传输文件小工具”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么用QT制作一个简易的传输文件小工具”吧!

先看下效果图

可以看到既可以接受文件也可进行发送文件，只要2台电脑在统一局域网内，就可发送和接受数据。

本地文件下出现了一份传输的文件。

直接看代码

.h

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>#include <QPushButton>#include <QLineEdit>#include <QTcpSocket>#include <QTcpServer>#include <QFile>#include <QTextEdit>#include <QProgressBar>class Widget : public QWidget{    Q_OBJECTpublic:    Widget(QWidget *parent = nullptr);    ~Widget();    void Init();private slots:    void onTcpConnected();    void onConnectClicked();    void ServerNewConnect();    void SocketReadData();    void onOpenFileClicked();    void onSendClicked();    void updateClientProgress(qint64 numBytes);private:    QPushButton *m_pConnectBtn=nullptr;    QLineEdit *m_pIpAddressEdit=nullptr;    QLineEdit *m_pPortEdit=nullptr;    QWidget *m_pTitleWgt=nullptr;    QLineEdit *m_pFilePathEdit=nullptr;    QPushButton *m_pOpenFileBtn=nullptr;    QPushButton *m_pSendBtn=nullptr;    QTextEdit *m_pTextEdit=nullptr;    QProgressBar *m_pReceiverBar=nullptr;    QProgressBar *m_pSendBar=nullptr;    QTcpSocket *m_pTcpSocket=nullptr;    QTcpServer *m_pTcpServer=nullptr;    QTcpSocket *m_pTcpServerSocket=nullptr;    //------receiver    qint64 m_bytesReceived;    qint64 m_fileNameSize;    qint64 m_totalBytes;    QString m_fileName;    QFile *m_localFile;    QByteArray m_inBlock;    //send    QFile *m_ClientlocalFile;    QString m_ClientfileName;    qint64 m_ClienttotalBytes;    qint64 m_ClientbytesWritten=0;    qint64 m_ClientbytesToWrite;    qint64 m_ClinetpayloadSize;    QByteArray m_ClientoutBlock;};#endif // WIDGET_H

.cpp

#include "widget.h"#include <QHBoxLayout>#include <QLabel>#include <QValidator>#include <QMessageBox>#include <QFileDialog>Widget::Widget(QWidget *parent)    : QWidget(parent){    this->resize(800,600);    Init();    m_pTcpSocket=new QTcpSocket(this);    connect(m_pTcpSocket,&QTcpSocket::connected,this,&Widget::onTcpConnected);  //若连接成功，则触发此信号    connect(m_pTcpSocket,SIGNAL(bytesWritten(qint64)),this,SLOT(updateClientProgress(qint64))); //发送数据    m_pTcpServer=new QTcpServer(this);    m_totalBytes=0;    m_bytesReceived=0;    m_fileNameSize=0;    connect(m_pTcpServer,&QTcpServer::newConnection,this,&Widget::ServerNewConnect);     if(!m_pTcpServer->listen(QHostAddress::Any, 2021))   //端口为2021     {         QMessageBox::warning(this,"Warning",m_pTcpServer->errorString(),QMessageBox::Ok);         return;     }}Widget::~Widget(){}void Widget::Init(){    m_pConnectBtn=new QPushButton(tr("Connect"),this);    m_pIpAddressEdit=new QLineEdit(this);    m_pPortEdit=new QLineEdit(this);    m_pPortEdit->setValidator(new QIntValidator());    m_pTitleWgt=new QWidget(this);    m_pIpAddressEdit->setFixedWidth(200);    m_pPortEdit->setFixedWidth(200);    m_pConnectBtn->setFixedSize(100,25);    QLabel *ipLabel=new QLabel(tr("IpAddress:"),this);    QLabel *portLabel=new QLabel(tr("Port:"),this);    ipLabel->setFixedWidth(60);    portLabel->setFixedWidth(40);    QHBoxLayout *titleLayout=new QHBoxLayout(this);    titleLayout->addWidget(ipLabel);    titleLayout->addWidget(m_pIpAddressEdit);    titleLayout->addWidget(portLabel);    titleLayout->addWidget(m_pPortEdit);    titleLayout->addWidget(m_pConnectBtn);    titleLayout->setMargin(5);    titleLayout->setSpacing(10);    titleLayout->addStretch();    m_pTitleWgt->setFixedHeight(40);    m_pTitleWgt->setLayout(titleLayout);    m_pIpAddressEdit->setText("192.168.2.110");    m_pPortEdit->setText("2021");    m_pPortEdit->setEnabled(false);    m_pFilePathEdit=new QLineEdit(this);    m_pOpenFileBtn=new QPushButton(tr("Open File"),this);    m_pSendBtn=new QPushButton(tr("Send"));    m_pFilePathEdit->setFixedWidth(500);    m_pOpenFileBtn->setFixedSize(100,25);    m_pSendBtn->setFixedSize(100,25);    m_pSendBtn->setEnabled(false);    QWidget *bottomWgt=new QWidget(this);    QHBoxLayout *bottomLayout=new QHBoxLayout(this);    bottomLayout->addWidget(m_pFilePathEdit);    bottomLayout->addWidget(m_pOpenFileBtn);    bottomLayout->addWidget(m_pSendBtn);    bottomLayout->setMargin(5);    bottomLayout->setSpacing(5);    bottomLayout->addStretch();    bottomWgt->setLayout(bottomLayout);    m_pTextEdit=new QTextEdit(this);    QLabel *receiverLabel=new QLabel(tr("Receiver Speed"),this);    QLabel *SendLabel=new QLabel(tr("Send Speed"),this);    receiverLabel->setFixedWidth(100);    SendLabel->setFixedWidth(100);    m_pReceiverBar=new QProgressBar(this);    m_pSendBar=new QProgressBar(this);    m_pReceiverBar->setFixedSize(300,30);    m_pSendBar->setFixedSize(300,30);    m_pReceiverBar->setOrientation(Qt::Horizontal);    m_pSendBar->setOrientation(Qt::Horizontal);    QWidget *receiverBarWgt=new QWidget(this);    QHBoxLayout *receiverBarLayout=new QHBoxLayout(this);    receiverBarLayout->addWidget(receiverLabel);    receiverBarLayout->addWidget(m_pReceiverBar);    receiverBarLayout->addStretch();    receiverBarLayout->setSpacing(5);    receiverBarWgt->setLayout(receiverBarLayout);    QWidget *sendBarWgt=new QWidget(this);    QHBoxLayout *sendBarLayout=new QHBoxLayout(this);    sendBarLayout->addWidget(SendLabel);    sendBarLayout->addWidget(m_pSendBar);    sendBarLayout->addStretch();    sendBarLayout->setSpacing(5);    sendBarWgt->setLayout(sendBarLayout);    connect(m_pConnectBtn,&QPushButton::clicked,this,&Widget::onConnectClicked);    connect(m_pOpenFileBtn,&QPushButton::clicked,this,&Widget::onOpenFileClicked);    connect(m_pSendBtn,&QPushButton::clicked,this,&Widget::onSendClicked);    QVBoxLayout *mainLayout=new QVBoxLayout(this);    mainLayout->addWidget(m_pTitleWgt);    mainLayout->addWidget(bottomWgt);    mainLayout->addWidget(receiverBarWgt);    mainLayout->addWidget(sendBarWgt);    mainLayout->addWidget(m_pTextEdit);    mainLayout->setMargin(0);    mainLayout->addStretch();    this->setLayout(mainLayout);}void Widget::onTcpConnected(){    m_pTextEdit->append("Connect Server Success!");}void Widget::onConnectClicked(){    QString strip=m_pIpAddressEdit->text();    QString strport=m_pPortEdit->text();    if(strip!=""&&strport!="")    {        m_pTcpSocket->connectToHost(strip,strport.toInt());  //请求连接    }    else    {        QMessageBox::warning(this,"Warning","IpAddress or Port is Null",QMessageBox::Ok);    }}void Widget::ServerNewConnect(){    m_pTcpServerSocket = m_pTcpServer->nextPendingConnection(); //服务端接受消息    QObject::connect(m_pTcpServerSocket, &QTcpSocket::readyRead, this, &Widget::SocketReadData);    m_pTextEdit->append("Connect Client Success");}void Widget::SocketReadData(){    QDataStream in(m_pTcpServerSocket);    in.setVersion(QDataStream::Qt_5_11);    if (m_bytesReceived<=sizeof(qint64)*2){        if((m_pTcpServerSocket->bytesAvailable()>=sizeof(qint64)*2)&&(m_fileNameSize==0)){            in>>m_totalBytes>>m_fileNameSize;            m_bytesReceived +=sizeof(qint64)*2;        }        if((m_pTcpServerSocket->bytesAvailable()>=m_fileNameSize)&&(m_fileNameSize!=0)){                    in>>m_fileName;                    m_bytesReceived+=m_fileNameSize;                    m_localFile = new QFile(m_fileName);                    if (!m_localFile->open(QFile::WriteOnly)){                        qDebug() << "server: open file error!";                        return;                    }                }                else{                    return;                }    }    if(m_bytesReceived<m_totalBytes) {            m_bytesReceived+=m_pTcpServerSocket->bytesAvailable();            m_inBlock = m_pTcpServerSocket->readAll();            m_localFile->write(m_inBlock);            m_inBlock.resize(0);        }        m_pReceiverBar->setMaximum(m_totalBytes);        m_pReceiverBar->setValue(m_bytesReceived);        if (m_bytesReceived==m_totalBytes){            m_localFile->close();            QString strSuccess=QString("File %1 ReceiverSucess").arg(m_fileName);            m_pTextEdit->append(strSuccess);            m_pTcpServerSocket->close();            m_totalBytes=0;            m_bytesReceived=0;            m_fileNameSize=0;        }}void Widget::onOpenFileClicked(){    QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),                                                    "/home",                                                    tr("File (*.*)"));    if(fileName!="")    {        m_ClientfileName=fileName;        m_pSendBtn->setEnabled(true);        m_pFilePathEdit->setText(fileName);    }}void Widget::onSendClicked(){    m_ClientoutBlock.clear();    m_ClientlocalFile=new QFile(m_ClientfileName);   if(!m_ClientlocalFile->open(QFile::ReadOnly)){       qDebug()<<"client:open file error!";       return;   }   m_ClienttotalBytes=m_ClientlocalFile->size();   QDataStream sendOut(&m_ClientoutBlock,QIODevice::WriteOnly);   sendOut.setVersion(QDataStream::Qt_5_11);   QString currentFileName=m_ClientfileName.right(m_ClientfileName.size()-m_ClientfileName.lastIndexOf('/')-1);   sendOut<<qint64(0)<<qint64(0)<<currentFileName;   m_ClienttotalBytes+=m_ClientoutBlock.size();   sendOut.device()->seek(0);   sendOut<<m_ClienttotalBytes<<qint64(m_ClientoutBlock.size()-sizeof(qint64)*2);   m_ClientbytesToWrite=m_ClienttotalBytes-m_pTcpSocket->write(m_ClientoutBlock);   m_ClientoutBlock.resize(0);}void Widget::updateClientProgress(qint64 numBytes){    m_ClientbytesWritten+=(int)numBytes;    if(m_ClientbytesToWrite>0){        m_ClientoutBlock=m_ClientlocalFile->read(qMin(m_ClientbytesToWrite,m_ClinetpayloadSize));        m_ClientbytesToWrite-=(int)m_pTcpSocket->write(m_ClientoutBlock);        m_ClientoutBlock.resize(0);    }    else{        m_ClientlocalFile->close();    }    m_pSendBar->setMaximum(m_ClienttotalBytes);    m_pSendBar->setValue(m_ClientbytesWritten);    if(m_ClientbytesWritten==m_ClienttotalBytes){        QString sendSuccess=QString("Send File %1 Success").arg(m_fileName);        m_pTextEdit->append(sendSuccess);        m_ClientlocalFile->close();        m_pTcpSocket->close();        m_ClientbytesWritten=0;    }}

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