qt 拷贝文件设置进度条

/**

• @brief FuncModuleWin::copyFile
• @param fromFIleName 优盘里面的文件
• @param toFileName 拷贝到/bin里面的启动文件

• @return

  /

  bool FuncModuleWin::copyFile(const QString &fromFIleName, const QString &toFileName)

  {

  char byteTemp = new char[4096];//字节数组

  int fileSize = 0;

  int totalCopySize = 0;

  QFile tofile;

  ui->progressBar_copy->setValue(0);

  tofile.setFileName(toFileName);

  tofile.open(QIODevice::WriteOnly)

  QDataStream out(&tofile);

  out.setVersion(QDataStream::Qt_4_8);

  QFile fromfile;

  fromfile.setFileName(fromFIleName);

  if(!fromfile.open(QIODevice::ReadOnly)){

  qDebug() << “open fromfile failed！！！”;

  return false;

  }

  fileSize = fromfile.size();

  QDataStream in(&fromfile);

  in.setVersion(QDataStream::Qt_4_8);

  ui->progressBar_copy->setRange(0, fileSize);

  while(!in.atEnd())

  {

  int readSize = 0;

  //读入字节数组,返回读取的字节数量，如果小于4096，则到了文件尾

  readSize = in.readRawData(byteTemp, 4096);

  out.writeRawData(byteTemp, readSize);

  totalCopySize += readSize;

  ui->progressBar_copy->setValue(totalCopySize);

  }

  if(totalCopySize == fileSize){

  tofile.setPermissions(QFile::ExeUser);

  return true;

  }

  else

  return false;

  }

  原文中缺少“ tofile.open(QIODevice::WriteOnly)”，即创建输出文件以及读写方式。

  转自：转载路径