圖片檔案

現在遇到的問題是writeRawData()讀取大檔案時程式崩潰，思路是分多次進行讀取和傳送，待寫
={}不明白可以去看我前面的文章，connect的過載

傳送端

  qDebug()<<"start to find pix"<<endl;
  QImage pic("D:/svn//timg.jpg");

  if(pic.isNull()){
    qDebug()<<"can not find pix"<<endl;
    return ;
  }
  else{
    qDebug()<<"succeed tot find pix"
 
<<endl;
  }
  QByteArray block; //用於暫存我們要傳送的資料
  QDataStream out(&block,QIODevice::ReadWrite);
  out.setVersion(QDataStream::Qt_4_6);
  qDebug()<<"pic.size:"<<pic.size()<<endl;
  //  out<<tr("hello Tcp!!!");
  out<<pic;
  out.device()->seek(0);
  QTcpSocket *clientConnection =
 
 tcpServer->nextPendingConnection();
  clientConnection->write(block);

接收端

  /*全域性變數  
  *QImage image;
  *QByteArray res_block;
  */
 connect(tcpSocket, &QTcpSocket::readyRead,
          [=](){
 //從通訊套接字中取出內容
 QByteArray array = tcpSocket->readAll();
 qDebug()<<"size:"<<array.
 
size()<<endl;
 res_block=res_block+array;
 qDebug()<<"res_block size:"<<res_block.size()<<endl;
 QDataStream image_stream(&res_block,QIODevice::ReadWrite);
 image_stream>>image;
 });

任意檔案(無法讀取大檔案)

傳送端

  QFile file("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  int flag=file.open(QIODevice::ReadOnly);
  QDataStream in(&file);
  QFileInfo fileInfo("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
  char datRawArray[fileInfo.size()];
  in.readRawData(datRawArray, fileInfo.size());
  QByteArray block(datRawArray,fileInfo.size());
  quint32 write_len = clientConnection->write(block);

接收端

  /*全域性變數  
  *QDataStream file_stream;
  *QByteArray  res_block;
  *QFile       file;
  */

  file.setFileName("D:/svn/UVSScure/Client/build/image_res.jpg");
  file.open(QIODevice::ReadWrite);
  file_stream.setDevice(&file);
  connect(tcpSocket, &QTcpSocket::readyRead,
          [=](){
    //從通訊套接字中取出內容
    QByteArray array = tcpSocket->readAll();
    qDebug()<<"size:"<<array.size()<<endl;
    res_block=res_block+array;
    qDebug()<<"res_block size:"<<res_block.size()<<endl;
    QDataStream image_stream(&res_block,QIODevice::ReadWrite);
	file_stream.writeRawData(res_block,res_block.size();//這個函式放在ondisconnect中 
	 });

}

TCP收發大檔案

1. TCP分多次傳送讀取和接收大檔案

  
  QFile file("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  int flag=file.open(QIODevice::ReadOnly);
  QDataStream in(&file);
  QFileInfo fileInfo("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
  
  connect(clientConnection,SIGNAL(disconnected()),clientConnection,
          SLOT(deleteLater()));
  
  int file_size;
  file_size=fileInfo.size();
  
  connect(clientConnection,&QTcpSocket::bytesWritten,[=](qint64 num){
    static int total_size=0;
    total_size+=num;
    qDebug()<<"num:"<<num<<endl;
    qDebug()<<"total_size:"<<total_size<<endl;
    qDebug()<<"file_size:"<<file_size<<endl;
    
    if(total_size>file_size){
      clientConnection->disconnectFromHost();
      qDebug()<<"wrirte finished!"<<endl;
      total_size=0;
    }
  });
  
  int buffer_size=65535;
  char datRawArray[buffer_size];
  qDebug()<<"nomal"<<fileInfo.size()<<endl;
  while(!in.atEnd()){
    in.readRawData(datRawArray, buffer_size);
    QByteArray block(datRawArray,buffer_size);
    qDebug()<<"block_size:"<<block.size()<<endl;
    quint32 write_len = clientConnection->write(block);
    qDebug("write len:%d",write_len);
  }

2. TCP接收檔案

  connect(tcpSocket,SIGNAL(disconnected()),this,SLOT(ondisconnect()));
  file.setFileName("D:/svn/UVSScure/Client/build/image_res.jpg");
  file.open(QIODevice::ReadWrite);
  file_stream.setDevice(&file);

  connect(tcpSocket, &QTcpSocket::readyRead,
          [=](){
    //從通訊套接字中取出內容
    QByteArray array = tcpSocket->readAll();
    qDebug()<<"size:"<<array.size()<<endl;
    res_block=res_block+array;
    qDebug()<<"res_block size:"<<res_block.size()<<endl;

  });

void ondisconnect(){
  if(file_stream.writeRawData(res_block,res_block.size())){
    qDebug()<<"write csv file successful"<<endl;
  }
  else{
    qDebug()<<"fail to save csv file"<<endl;
  }  
  file.close();
  qDebug()<<"file closed !"<<endl;
}

TCP一次性發送發大檔案

  QFile file("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  int flag=file.open(QIODevice::ReadOnly);
  QDataStream in(&file);
  QFileInfo fileInfo("D:/svn/UVSScure/Client/build/jpeg_2_128.jpg");
  QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
  QByteArray total_file;
  connect(clientConnection,SIGNAL(disconnected()),clientConnection,
          SLOT(deleteLater()));
  
  int file_size;
  file_size=fileInfo.size();
  
  connect(clientConnection,&QTcpSocket::bytesWritten,[=](qint64 num){
      clientConnection->disconnectFromHost();
  });
  
  int buffer_size=65535;
  char datRawArray[buffer_size];
  qDebug()<<"nomal"<<fileInfo.size()<<endl;
  while(!in.atEnd()){
    in.readRawData(datRawArray, buffer_size);
    QByteArray block(datRawArray,buffer_size);
    qDebug()<<"block_size:"<<block.size()<<endl;
    total_file+=block
  }
  quint32 write_len = clientConnection->write(total_file);
  qDebug("write len:%d",write_len);