qt 拷贝文件设置进度条

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/**  * @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);     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; }