得到驱动器信息

RFs 可以通过 Drive() 方法得到一个 TDriveInfo 的对像，该对像描述的驱动器信息

定义如下：TInt Drive(TDriveInfo& anInfo,TInt aDrive=KDefaultDrive) const

传入一个 TDriveInfo 对像，及一个 EDriveA~Z 的对像， DriveA~Z 表示驱动器，如果要遍例所有的驱动器

可以通过

TInt driverNumber =EDriveA;
for (;driverNumber<=EDriveZ;driverNumber++)
{
  ifs.Drive(di,driverNumber);
  if (di.iDriveAtt == KDriveAbsent)
   continue;

  }

TDriveInfo 有 iDriveAtt 属性表示驱动器属性，有以下值

Location: e32std.h

Drive attributes

--------------------------------------------------------------------------------
KDriveAttLocal
const TUint KDriveAttLocal
Description
Drive is local.　　本地驱动
--------------------------------------------------------------------------------
KDriveAttRom
const TUint KDriveAttRom
Description
ROM drive. ROM 驱动
--------------------------------------------------------------------------------
KDriveAttRedirected
const TUint KDriveAttRedirected
Description
Output from a process on one drive redirected to another drive.

进程在一个驱动的输出重新定向到另外一个驱动上
--------------------------------------------------------------------------------
KDriveAttSubsted
const TUint KDriveAttSubsted
Description
Drive letter has been substituted (assigned a path).

驱动器被替代（指向一个路径）
--------------------------------------------------------------------------------
KDriveAttInternal
const TUint KDriveAttInternal
Description
Drive is internal (not removable).
--------------------------------------------------------------------------------
KDriveAttRemovable
const TUint KDriveAttRemovable
Description
Drive is removable.

其它的属性 iMediaAtt 及 iType和iBattery 可以查询 sdk

具体使用请看以下代码（来自 sdk例子）

#include "DriveInfoLx.h"
#include <e32base.h>
#include <e32std.h>
#include <e32cons.h>            // Console
#include <f32file.h>

//  Constants
_LIT(KTextConsoleTitle, "Console");
_LIT(KTextFailed, " failed, leave code = %d");
_LIT(KTextPressAnyKey, " [press any key]\n");

//  Global Variables
LOCAL_D CConsoleBase* console;  // write all messages to this
RFs ifs;
//  Local Functions
void formatDriveInfo(TDes& abuf,TDriveInfo &di);
void printDriveInfo()
{
User::LeaveIfError(ifs.Connect());
TDriveInfo di;
TBuf<256> buf;
TInt driverNumber =EDriveA;
for (;driverNumber<=EDriveZ;driverNumber++)
{
  ifs.Drive(di,driverNumber);
  if (di.iDriveAtt == KDriveAbsent)
   continue;

  formatDriveInfo(buf,di);
  buf.Delete(0,buf.Length());
  console->Getch();
}

ifs.Close();
}
void formatDriveInfo(TDes& abuf,TDriveInfo &di)
{
_LIT(KFormatString,"iType=%02x,iDriveAtt=%02x,iMediaAtt=%02x\n");
_LIT(KBatLow,"Battery low\n");
_LIT(KBatgood,"Battery good\n");
_LIT(KBatNotsupported,"Battery not supported");
_LIT(KNotPresent,"No media present\n");
_LIT(Kfloppy,"Media is floppy disk\n");
_LIT(KHard,"Media is hard disk\n");
_LIT(KCDROM,"Media is CD-ROM\n");
_LIT(KRam,"Media is RAM\n");
_LIT(KRom,"Media is ROM\n");
_LIT(KFlash,"Media is flash\n");
_LIT(KRemote,"Media is remote\n");
_LIT(KUnknown,"Media is unknown\n");
_LIT(KDriveAtts,"Drive attributes:");
_LIT(KLocal," local");
_LIT(KRomDrive," Rom");
_LIT(KRedirected," redirected");
_LIT(KSubstituted," substituted");
_LIT(KInternal," internal");
_LIT(KRemoveable," removeable");
_LIT(KDynamic," dynamic");
_LIT(KDual," dual-desity");
_LIT(KFormattable," formattable");
_LIT(KWriteProtected," write-protected");
_LIT(KnewLine,"\n");
_LIT(KMediaAtts,"\nMedia attributes:");
abuf.AppendFormat(KFormatString,TInt(di.iType),TInt(di.iBattery),TInt(di.iDriveAtt)
  ,TInt(di.iMediaAtt));
switch(di.iBattery)
{
case EBatLow:
  abuf.Append(KBatLow);
  break;
case EBatGood:
  abuf.Append(KBatgood);
  break;
default:
  abuf.Append(KBatNotsupported);
}
switch(di.iType)
{
case EMediaNotPresent:
  abuf.Append(KNotPresent);
  break;
case EMediaFloppy:
  abuf.Append(Kfloppy);
  break;
case EMediaHardDisk:
  abuf.Append(KHard);
  break;
case EMediaCdRom:
  abuf.Append(KCDROM);
  break;
case EMediaRam:
  abuf.Append(KRam);
  break;
case EMediaFlash:
  abuf.Append(KFlash);
  break;
case EMediaRom:
  abuf.Append(KRom);
  break;
case EMediaRemote:
  abuf.Append(KRemote);
  break;
default:
  abuf.Append(KUnknown);
}

abuf.Append(KDriveAtts);
if (di.iDriveAtt && KDriveAttLocal)
  abuf.Append(KLocal);
if (di.iDriveAtt && KDriveAttRom)
  abuf.Append(KRomDrive);
if (di.iDriveAtt && KDriveAttRedirected)
  abuf.Append(KRedirected);
if (di.iDriveAtt && KDriveAttSubsted)
  abuf.Append(KSubstituted);
if (di.iDriveAtt && KDriveAttInternal)
  abuf.Append(KInternal);
if (di.iDriveAtt && KDriveAttRemovable)
  abuf.Append(KRemoveable);
abuf.Append(KMediaAtts);
if (di.iMediaAtt && KMediaAttVariableSize)
  abuf.Append(KDynamic);
if (di.iMediaAtt && KMediaAttDualDensity)
  abuf.Append(KDual);
if (di.iMediaAtt && KMediaAttFormattable)
  abuf.Append(KFormattable);
if (di.iMediaAtt && KMediaAttWriteProtected)
  abuf.Append(KWriteProtected);
abuf.Append(KnewLine);
console->Printf(abuf);

}
LOCAL_C void MainL(const TDesC& aArgs)
    {
    //
    // add your program code here, example code below
    //
    //console->Write(_L("Hello, world!\n"));
printDriveInfo();
    console->Printf(_L("Command line args: \"%S\"\n"), &aArgs);
    }

通过 TVolumeInfo 可以得到驱动器的总空间及剩余空间大小，及 DriveInfo 信息，同时也能得到 Drive Name ,但代码里写上就是无法得到
VolumeName，不知是不是模拟器与真机不同，以下是测试代码

void viewVolumnInfo()
{
    User::LeaveIfError(ifs.Connect());
    _LIT(KVInfo,"drive:%S\nTotal size:%d\nFree Size:%d\n");

    TVolumeInfo  vi;
    TInt driveNum=EDriveA;
    for (;driveNum<=EDriveZ;driveNum++)
    {
        TInt error = ifs.Volume(vi,driveNum);
        if (error !=KErrNone )
        {

            console->Printf(KVInfo,&vi.iName,vi.iSize,vi.iFree);
            console->Getch();
        }

    }

    ifs.Close();
}