Copy a File over the Network

[raphaelf]

Hi everybody,

i am trying to copy a File over the Network and i would like to show in a progressbar the status of copy..

I have tried this example but it takes to long.

i heard about QUrlOperator, but under QT 4 its not working..

Could somebody show me how to copy a big file over the network and show the status in a progressbar?

QFile src("W:\\1Data\\Public\\Transfer\\Notes.exe");
QFile dst("notes.exe");
if(!src.open(QFile::ReadOnly) || !dst.open(QFile::WriteOnly)) return;
 
qint64 len = src.bytesAvailable();
ui.dlg->setRange(0,len);
ui.dlg->show();
char ch;
while(!src.atEnd()){  
	src.getChar(&ch);
	dst.putChar(ch);
	ui.dlg->setValue(ui.dlg->value()+1);  
	qApp->processEvents();}

QFile src("W:\\1Data\\Public\\Transfer\\Notes.exe");
QFile dst("notes.exe");
if(!src.open(QFile::ReadOnly) || !dst.open(QFile::WriteOnly)) return;

qint64 len = src.bytesAvailable();
ui.dlg->setRange(0,len);
ui.dlg->show();
char ch;
while(!src.atEnd()){  
	src.getChar(&ch);
	dst.putChar(ch);
	ui.dlg->setValue(ui.dlg->value()+1);  
	qApp->processEvents();}

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Thanks

[marcel]

It is slow because you're copying byte by byte... What if the file is 1Mb in size?
Try using QDataStream::readRawData and QDataSteam::writeBytes to read and write bigger chunks.

[raphaelf]

Hi,

Data between 50-300 MB

I search here and in the docs a example but i didint find it

Could somebody help me to use my code, but for big files?

[Fastman]

If use Windows - fastest metod:

qint16 nRet = CopyFileEx(source.utf16(), destination.utf16(), CopyProgressRoutine, (LPVOID)this, false, COPY_FILE_RESTARTABLE);

qint16 nRet = CopyFileEx(source.utf16(), destination.utf16(), CopyProgressRoutine, (LPVOID)this, false, COPY_FILE_RESTARTABLE);

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CallBack :

static DWORD WINAPI CopyProgressRoutine(LARGE_INTEGER TotalFileSize,
											LARGE_INTEGER TotalBytesTransferred, 
											LARGE_INTEGER StreamSize, 
											LARGE_INTEGER StreamBytesTransferred, 
											DWORD dwStreamNumber, 
											DWORD dwCallbackReason, 
											HANDLE hSourceFile, 
											HANDLE hDestinationFile, 
											LPVOID lpData )
	{
		CWorkFiles &progressInfo = *(CWorkFiles *)lpData;
		qint16 nPrc = (int)((TotalBytesTransferred.QuadPart * 100) / TotalFileSize.QuadPart);
 
		if ((nPrc - progressInfo.nPrc_old) >= 5)
		{
			//For Example: write copy progress in database
                        //db_work db;
			//db.SetPercent(nPrc, progressInfo.nId);
			//db.CloseDB();
			//progressInfo.nPrc_old = nPrc;
		}
 
		return PROGRESS_CONTINUE;
	}

static DWORD WINAPI CopyProgressRoutine(LARGE_INTEGER TotalFileSize,
											LARGE_INTEGER TotalBytesTransferred, 
											LARGE_INTEGER StreamSize, 
											LARGE_INTEGER StreamBytesTransferred, 
											DWORD dwStreamNumber, 
											DWORD dwCallbackReason, 
											HANDLE hSourceFile, 
											HANDLE hDestinationFile, 
											LPVOID lpData )
	{
		CWorkFiles &progressInfo = *(CWorkFiles *)lpData;
		qint16 nPrc = (int)((TotalBytesTransferred.QuadPart * 100) / TotalFileSize.QuadPart);
		
		if ((nPrc - progressInfo.nPrc_old) >= 5)
		{
			//For Example: write copy progress in database
                        //db_work db;
			//db.SetPercent(nPrc, progressInfo.nId);
			//db.CloseDB();
			//progressInfo.nPrc_old = nPrc;
		}
		
		return PROGRESS_CONTINUE;
	}

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if you can use only QT:

bool CWorkFiles::copyFile (QString source, QString &destination, bool overwrite, bool move,qint16 nSysID)
{	
	db_work db;
 
	QFileInfo sourceInfo = QFileInfo(source);
	QFileInfo destinationInfo = QFileInfo(destination);
 
	if(!sourceInfo.exists()) 
	{
		qDebug("File Copy Failed - Source File does not exists.");
		return false;
	}
	else if(!sourceInfo.isFile())
	{
		qDebug("File Copy Failed - Source is not a file.");
		return false;
	}
	else if(!destinationInfo.exists())
	{
		qDebug("File Copy Failed - Destination cannot be found.");
		return false;
	}
 
	if(destinationInfo.isDir())
		destination = (QFileInfo(QDir(destinationInfo.absoluteFilePath()), sourceInfo.fileName())).filePath(); 
	else if(!destinationInfo.isFile())
	{
		qDebug("File Copy failed - Destination is neither a file or directory.");
		return false;
	}
 
	if(!overwrite && QFile::exists(destination))
	{
		qDebug("File Copy failed - Destination file exists, overwrite disabled.");
		return false; 
	}
 
	QFile sourceFile(source);
	QFile destinationFile(destination);
 
	if(sourceFile.open(QIODevice::ReadOnly) && destinationFile.open(QIODevice::WriteOnly))
	{
		// show progress
		double nPercent = 0.00;
		double nNewPercent = 0.00;
		uint dataLength = 32 * 1024;
		char *data = new char[dataLength];
		double completed = 0;
		double nFsize; 
		nFsize = sourceFile.size();
		double dMn;
 
		if (nFsize > 0)
		{
			db.SetPercent(0, nSysID);
			db.CloseDB();
			dMn = (100 / nFsize);
			qint16 nCount = 0;
			while(!sourceFile.atEnd())
			{
				qint64 nReaded = sourceFile.read(data, dataLength);
				if (nReaded <= 0)
					continue;
				completed += nReaded;
				destinationFile.write(data, nReaded);
				destinationFile.flush();
				nNewPercent = nPercent;
				nCount++;
 
				if (nCount > 100 || dataLength !=nReaded)
				{
					nPercent = completed * dMn;
					db.SetPercent((qint64)nPercent, nSysID);
					db.CloseDB();
					nCount = 0;
				}
			}
		}
		else
		{
			delete[] data;
			return false;
		}
		delete[] data;
 
		db.SetPercent(100, nSysID);
		db.CloseDB();
 
		if(move)
		{
			if(!sourceFile.remove())
			{
				destinationFile.remove();
				sourceFile.close();
				destinationFile.close();
				qDebug("File Copy failed - Source file could not be removed.");
				return false;
			}
		}
		sourceFile.close();
		destinationFile.close();
	}
	else
	{
		sourceFile.close();
		destinationFile.close();
		qDebug("DBG: Error - Source or destination file could not be opened.");
		qDebug("File Copy failed - Source or destination file could not be opened.");
		return false;
	}
	return true;
}

bool CWorkFiles::copyFile (QString source, QString &destination, bool overwrite, bool move,qint16 nSysID)
{	
	db_work db;

	QFileInfo sourceInfo = QFileInfo(source);
	QFileInfo destinationInfo = QFileInfo(destination);

	if(!sourceInfo.exists()) 
	{
		qDebug("File Copy Failed - Source File does not exists.");
		return false;
	}
	else if(!sourceInfo.isFile())
	{
		qDebug("File Copy Failed - Source is not a file.");
		return false;
	}
	else if(!destinationInfo.exists())
	{
		qDebug("File Copy Failed - Destination cannot be found.");
		return false;
	}

	if(destinationInfo.isDir())
		destination = (QFileInfo(QDir(destinationInfo.absoluteFilePath()), sourceInfo.fileName())).filePath(); 
	else if(!destinationInfo.isFile())
	{
		qDebug("File Copy failed - Destination is neither a file or directory.");
		return false;
	}

	if(!overwrite && QFile::exists(destination))
	{
		qDebug("File Copy failed - Destination file exists, overwrite disabled.");
		return false; 
	}

	QFile sourceFile(source);
	QFile destinationFile(destination);

	if(sourceFile.open(QIODevice::ReadOnly) && destinationFile.open(QIODevice::WriteOnly))
	{
		// show progress
		double nPercent = 0.00;
		double nNewPercent = 0.00;
		uint dataLength = 32 * 1024;
		char *data = new char[dataLength];
		double completed = 0;
		double nFsize; 
		nFsize = sourceFile.size();
		double dMn;
		
		if (nFsize > 0)
		{
			db.SetPercent(0, nSysID);
			db.CloseDB();
			dMn = (100 / nFsize);
			qint16 nCount = 0;
			while(!sourceFile.atEnd())
			{
				qint64 nReaded = sourceFile.read(data, dataLength);
				if (nReaded <= 0)
					continue;
				completed += nReaded;
				destinationFile.write(data, nReaded);
				destinationFile.flush();
				nNewPercent = nPercent;
				nCount++;

				if (nCount > 100 || dataLength !=nReaded)
				{
					nPercent = completed * dMn;
					db.SetPercent((qint64)nPercent, nSysID);
					db.CloseDB();
					nCount = 0;
				}
			}
		}
		else
		{
			delete[] data;
			return false;
		}
		delete[] data;

		db.SetPercent(100, nSysID);
		db.CloseDB();

		if(move)
		{
			if(!sourceFile.remove())
			{
				destinationFile.remove();
				sourceFile.close();
				destinationFile.close();
				qDebug("File Copy failed - Source file could not be removed.");
				return false;
			}
		}
		sourceFile.close();
		destinationFile.close();
	}
	else
	{
		sourceFile.close();
		destinationFile.close();
		qDebug("DBG: Error - Source or destination file could not be opened.");
		qDebug("File Copy failed - Source or destination file could not be opened.");
		return false;
	}
	return true;
}

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For Windiws i'am use first example, because the sizes of files with which I work 1-15Gb the second example too works not bad - but more slowly.

[raphaelf]

Hi,

Thank you very much, it works :=)