@
QString TvInfo(QString & tdrive)
{

WCHAR szVolumeName[256] ;
WCHAR szFileSystemName[256];
DWORD dwSerialNumber = 0;
DWORD dwMaxFileNameLength=256;
DWORD dwFileSystemFlags=0;

bool ret = false;
qDebug()<<  "get bool return-----" <<GetVolumeInformation( (WCHAR *) tdrive.utf16(),szVolumeName,256,&dwSerialNumber,&dwMaxFileNameLength,&dwFileSystemFlags,szFileSystemName,256);
qDebug()<< "FileSystemName format type----"<<QString::fromUtf16 ( (const ushort *) szFileSystemName) ;
qDebug()<< "VolumeName--------v"<<QString::fromUtf16 ( (const ushort *) szVolumeName).toAscii();
qDebug()<< "SerialNumber"<<dwSerialNumber ;
qDebug()<< "MaxFileNameLength"<<dwMaxFileNameLength ;

qDebug()<< "FileSystemFlags"<< dwFileSystemFlags;

qDebug()<< "hello "<< 256 ;
if(!ret)return QString("");
QString vName=QString::fromUtf16 ( (const ushort *) szVolumeName) ;
vName.trimmed();
return vName;
}

void Drive::GetDriveDetail()
{
qDebug()<<"all get drive here////////////////////////////////////////////////////";
foreach( QFileInfo drive, QDir::drives() )
{
qDebug()<<"--------------------------------";
QString tdrv=drive.absolutePath();
bool tdrvisdirectory=drive.isDir();
qDebug()<<"tdrvisdirectory---------"<<tdrvisdirectory;
qDebug()<<"path----"<<tdrv ;
QString volume_name = TvInfo(tdrv);
qDebug()<<"volume name--------"<<volume_name;
}
}@

my output is.
@
all get drive here////////////////////////////////////////////////////

tdrvisdirectory--------- true
path---- "C:/"
get bool return----- 1
FileSystemName format type---- "NTFS"
VolumeName--------v ""
SerialNumber 2551737821
MaxFileNameLength 255
FileSystemFlags 65470719
hello 256
volume name-------- ""

tdrvisdirectory--------- true
path---- "F:/"
get bool return----- 1
FileSystemName format type---- "NTFS"
VolumeName--------v "New Volume"
SerialNumber 208470474
MaxFileNameLength 255
FileSystemFlags 65470719
hello 256
volume name-------- ""
@

here i want list of drives, total size, used space, free space ,drive is external ,hard disk.but some thing are missing