convertir un ULARGE

Bonjour, comment convertir un ULARGE_INTEGER dans un type de base ou dans un type Qt? Le but serai que l'avoir dans un qint64.
Voila mon code:

Code:

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	PULARGE_INTEGER lpFreeBytesAvailable;
	PULARGE_INTEGER lpTotalNumberOfBytes;
	PULARGE_INTEGER lpTotalNumberOfFreeBytes;
	WCHAR lpDirectoryName[mountPoint.length()+1];
	mountPoint.toWCharArray(lpDirectoryName)*2;
	if(GetDiskFreeSpaceEx(lpDirectoryName,lpFreeBytesAvailable,lpTotalNumberOfBytes,lpTotalNumberOfFreeBytes)==0)
	{
		DEBUGCONSOLE(10,"freeSpaceDrive","Unable stat this mount point: "+mountPoint);
		return -1;
	}
	else
	{
		DEBUGCONSOLE(90,"freeSpaceDrive","lpFreeBytesAvailable: "+QString::number(lpFreeBytesAvailable));
		DEBUGCONSOLE(90,"freeSpaceDrive","lpTotalNumberOfBytes: "+QString::number(lpTotalNumberOfBytes));
		DEBUGCONSOLE(90,"freeSpaceDrive","lpTotalNumberOfFreeBytes: "+QString::number(lpTotalNumberOfFreeBytes));
		qint64 tempReturn=0;
		double temp=lpFreeBytesAvailable;
		tempReturn=(double)lpFreeBytesAvailable.QuadPart;
		tempReturn*=(double)lpTotalNumberOfBytes.QuadPart;
		tempReturn*=(double)lpTotalNumberOfFreeBytes.QuadPart;
		return tempReturn;
	}

Aucune solution sur internet n'as marché.