Qt PC 安卓 tcp传输文件

废话不多说，如题，上代码

      qt PC端
      头文件
      //网络部分
      #include <QTcpSocket>
      #include <QFile>
      #include <QFileDialog>
      #include <QHeaderView>
      #include <QScrollBar>
      具体实现
      void MainForm::openFile() //打开文件
      {
          filename = QFileDialog::getOpenFileName(this);
         if(!filename.isEmpty())
          {
             qDebug()<<"open file ok"<<filename;
          }
      }
      void MainForm::send()
      {
          tcpClient->connectToHost(ui->lineEdit->text(),8888);
      }
      void MainForm::startTransfer()
      {
          localFile = new QFile(filename);
         if(!localFile->open(QFile::ReadOnly))
          {
              QMessageBox::information(this,"警告","文件打开失败",QMessageBox::Ok);
             return;
          }
          totalBytes = localFile->size();
         QDataStream sendout(&outlock,QIODevice::WriteOnly);
          sendout.setVersion(QDataStream::Qt_5_3);
          QString currentFileName = filename.right(filename.size()-filename.lastIndexOf("/")-1);
          sendout << qint64(0) << qint64(0) <<currentFileName;
          totalBytes += outlock.size();
          sendout.device()->seek(0);
          sendout<<totalBytes<<qint64((outlock.size() - sizeof(qint64)*2));
          bytestowrite = totalBytes - tcpClient->write(outlock);
         qDebug("已连接");
          outlock.resize(0);
      }
      void MainForm::updaraclientprogress(qint64 numbytes)
      {
          bytesWrittens += (int)numbytes;
         if(bytestowrite > 0)
          {
              outlock = localFile->read(qMin(bytestowrite,locaksize));
              bytestowrite -= (int)tcpClient->write(outlock);
              outlock.resize(0);
          }
         else {
              localFile->close();
          }
         qDebug()<<bytestowrite<<"-------------------->>";
         if(bytesWrittens == totalBytes)
          {
             qDebug("发送完成");
              localFile->close();
              tcpClient->close();
              QMessageBox::information(this,"提示","同步完成",QMessageBox::Ok);
          }
      }
  
 

      接收端
      void Widget::start()
      {
          reciverBytes = 0;
          tcpserver.listen(QHostAddress::Any,8888);           //监听任意IP的8888端口
         connect(&tcpserver,SIGNAL(newConnection()),this,SLOT(acceptConnection()));   //当有新的连接连入客户端时，启动文件接受
      }
      //建立连接
      void Widget::acceptConnection()
      {
          tcpserverconnection = tcpserver.nextPendingConnection();                                                                            //建立连接
         connect(tcpserverconnection,SIGNAL(readyRead()),this,SLOT(updataServerProgress()));                                                 //发送连接信号
         connect(tcpserverconnection,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(disPlayError(QAbstractSocket::SocketError)));     //将新的连接与信息处理连接，当连接出现问题是，输出相应的错误信息
          QString IPAddressString;                                                                                                            //用于存放对方的Ip地址，
          QList<QHostAddress> ipAddresslist = QNetworkInterface::allAddresses();                                                              //获取所有的IP地址
         for(int i=0;i<ipAddresslist.size();i++)                                                                                             //获取连入主机的IP
          {
             if(ipAddresslist.at(i) != QHostAddress::LocalHost && ipAddresslist.at(i).toIPv4Address())                                       //获得IPv4
              {
                  IPAddressString = ipAddresslist.at(i).toString();                                                                           //获得IPv4地址
                 break;
              }
             if(ipAddresslist.isEmpty())                                                                                                     //如果ip地址列表为空，则表示现在没有任何用户连接到主机，显示主机自己的IP，其实，这个也是不会执行的，有连接不然会有IP，不会存在连接存在，而IP没有的时候
              {
                  IPAddressString = QHostAddress(QHostAddress::LocalHost).toString();                                                         //获取本机IP地址
              }
          }
      }
      void Widget::updataServerProgress() //接收文件
      {
         QDataStream in(tcpserverconnection);
          in.setVersion(QDataStream::Qt_5_3);                                                                                                 //使用QDataStream::Qt_5_3 协议解析数据
         if(reciverBytes <= sizeof(qint64)*2)                                                                                                //如果文件数据小雨16字节，那么是刚开始传输数据，我们保存的我//未来的头文件信息
          {
             if((tcpserverconnection->bytesAvailable()>=sizeof(qint64)*2)&&(fileNameSize ==0))
              {                                                                                                                               //接收数据总大小信息和文件名大小信息
                  in >> totalBytes >>fileNameSize;
                  reciverBytes += sizeof(qint64)*2;
              }
             if((tcpserverconnection->bytesAvailable()>=fileNameSize)&&(fileNameSize!=0))
              {                                                                                                                               //接受文件名，并建立文件
                  in >> fileName;
                  reciverBytes += fileNameSize;
                  localFile = new QFile(fileName);
                 if(!localFile->open(QFile::WriteOnly))
                  {
                     return;
                  }
              }
         else return;
          }
         if(reciverBytes < totalBytes)
          {                                                                                                                                   //如果接收数据小于总数据，那么将数据信息写入文件中。
              reciverBytes += tcpserverconnection->bytesAvailable();
              inblokc = tcpserverconnection->readAll();
              localFile->write(inblokc);
              inblokc.resize(0);
          }
         if(reciverBytes == totalBytes)
          {                                                                                                                                   //接受完成时，关闭文件，变量初始化
              tcpserverconnection->close();
              localFile->close();
              totalBytes =0;
              reciverBytes =0;
              fileNameSize = 0;
      // opendatabase(); //如果要使用数据库作为文件的解析，可直接调用数据库文件解析函数即可
          }
      }
  
 

文章来源: dreamlife.blog.csdn.net，作者：DreamLife.，版权归原作者所有，如需转载，请联系作者。

原文链接：dreamlife.blog.csdn.net/article/details/47339203