qt 拷貝文件設置進度條

/**

• @brief FuncModuleWin::copyFile

• @param fromFIleName 優盤裏面的文件

• @param toFileName 拷貝到/bin裏面的啓動文件

• @return
  /
  bool FuncModuleWin::copyFile(const QString &fromFIleName, const QString &toFileName)
  {
  char byteTemp = new char[4096];//字節數組
  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;
  //讀入字節數組,返回讀取的字節數量，如果小於4096，則到了文件尾
  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)”，即創建輸出文件以及讀寫方式。
  轉自：轉載路徑