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SYMBIAN OS V9.4

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DriveInfo: drive lists and drive and volume information

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Example code

Found in: examples\Base\FileServer\DriveInfo

The files reproduced here are the main files contained in the examples directory. Some extra files may be needed to run the examples, and these will be found in the appropriate examples directory. 

// DriveInfo.cpp
//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.


#include <f32file.h>
#include "CommonFramework.h"
    

LOCAL_D RFs fsSession;

// example functions
void PrintDriveVolInfo();

// utility functions
void FormatDriveInfo(TDes& aBuffer, const TDriveInfo aDriveInfo);
void FormatVolumeInfo(TDes& aBuffer, const TVolumeInfo aVolumeInfo);

void WaitForKey()
    {
    _LIT(KMessage,"Press any key to continue\n\n");
    console->Printf(KMessage);
    console->Getch();
    }

// do the example
LOCAL_C void doExampleL()
    {
    // Connect to file server
    User::LeaveIfError(fsSession.Connect()); // Start session
    PrintDriveVolInfo();
    fsSession.Close(); // close file server session
    }

void PrintDriveVolInfo()
    {
    _LIT(KMessage,"PrintDriveVolInfo()\n");
    _LIT(KValidDriveMsg,"\nValid drives as characters (and as numbers) are:\n");
    _LIT(KDriveChar,"%c");
    _LIT(KDriveNum,"(%d) ");
    _LIT(KNewLine,"\n");
    _LIT(KAvailDriveMsg,"\nUsing DriveList(), available drives are: ");
    _LIT(KDriveAtts,"%c: %02x ");
    _LIT(KDriveInfo,"\nDrive information for %c: drive is:\n%S");
    _LIT(KVolInfo,"\nVolume information for %c: is:\n%S");

    console->Printf(KMessage);

    // Print the valid drives as characters and as numbers. 
    // Then print the drive list (list of available drives), and
    // information about each drive in the list using Drive(). 
    // Finally, print volume information.

    console->Printf(KValidDriveMsg);

    TInt driveNumber=EDriveA; 
    TChar driveLetter; 
    for (; driveNumber<=EDriveZ; driveNumber++)
        {
        if (fsSession.IsValidDrive(driveNumber))
            {
            fsSession.DriveToChar(driveNumber,driveLetter);
            console->Printf(KDriveChar,TUint(driveLetter));
            fsSession.CharToDrive(driveLetter, driveNumber);
            console->Printf(KDriveNum,driveNumber);
            }
        }
    console->Printf(KNewLine);

    TDriveList drivelist; 
    User::LeaveIfError(fsSession.DriveList(drivelist));
    // A TDriveList (the list of available drives), is an array of 
    // 26 bytes. Each byte with a non zero value signifies that the 
    // corresponding drive is available.

    console->Printf(KAvailDriveMsg);
    for (driveNumber=EDriveA; driveNumber<=EDriveZ;driveNumber++)
        {
        if (drivelist[driveNumber]) // if drive-list entry non-zero, drive is available
            {
            User::LeaveIfError(fsSession.DriveToChar(driveNumber,driveLetter));
            // The following line prints the drive letter followed by the hex value 
            // of the integer indicating that drive's attributes 
            console->Printf(KDriveAtts,TUint(driveLetter), drivelist[driveNumber]);
            }
        }
    console->Printf(KNewLine);

    // Print information about available drives 

    TBuf<200> buffer;
    TDriveInfo driveInfo; 
    for (driveNumber=EDriveA; driveNumber<=EDriveZ; driveNumber++)
        {
        fsSession.Drive(driveInfo,driveNumber);
        if (driveInfo.iDriveAtt==KDriveAbsent)
            // test whether drive is available. If not, skip to next drive
            continue;
        FormatDriveInfo(buffer,driveInfo);
        User::LeaveIfError(fsSession.DriveToChar(driveNumber,driveLetter));
        console->Printf(KDriveInfo,TUint(driveLetter),&buffer);
        buffer.Zero();
        WaitForKey();
        }

    // Print volume information for all available drives. TVolumeInfo
    // provides drive information, and additional information about
    // the volume. Just print out the volume information.
 
    TVolumeInfo volumeInfo;
    for (driveNumber=EDriveA; driveNumber<=EDriveZ; driveNumber++)
        {
        TInt err=fsSession.Volume(volumeInfo,driveNumber);
        if (err!=KErrNotReady) 
            // Volume() returns KErrNotReady if no volume present.
            // In this case, check next drive number
            {
            buffer.Zero();
            FormatVolumeInfo(buffer,volumeInfo);
            User::LeaveIfError(fsSession.DriveToChar(driveNumber,driveLetter));
            console->Printf(KVolInfo,
                (TUint)driveLetter,&buffer);
            WaitForKey();
            }
        }
    }

void FormatDriveInfo(TDes& aBuffer, const TDriveInfo aDriveInfo)
    {
    // Append battery, media and drive information to aBuffer
    // Define descriptor constants using the _LIT macro 
    _LIT(KFormatString,"iType=%02x,iBattery=%02x,iDriveAtt=%02x,iMediaAtt=%02x\n");
    _LIT(KBatLow,"Battery low\n");
    _LIT(KBatGood,"Battery good\n");
    _LIT(KBatNotSupported,"Battery not supported\n");
    _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(KFlash,"Media is flash\n");
    _LIT(KRom,"Media is ROM\n");
    _LIT(KRemote,"Media is remote\n");
    _LIT(KNANDFlash,"Media is NAND flash\n");
    _LIT(KUnknown,"Media unknown\n");
    _LIT(KDriveAtts,"Drive attributes:");
    _LIT(KLocal," local");
    _LIT(KROMDrive," ROM");
    _LIT(KRedirected," redirected");
    _LIT(KSubstituted," substituted");
    _LIT(KInternal," internal");
    _LIT(KRemovable," removable");
    _LIT(KMediaAtts,"\nMedia attributes:");
    _LIT(KDynamic," dynamic");
    _LIT(KDual," dual-density");
    _LIT(KFormattable," formattable");
    _LIT(KLockable," lockable");
    _LIT(KLocked," locked");
    _LIT(KHasPassword," has password");
    _LIT(KWriteProtected," write-protected");
    _LIT(KNewLine,"\n");

    aBuffer.AppendFormat(KFormatString, TInt(aDriveInfo.iType), 
        TInt(aDriveInfo.iBattery), TInt(aDriveInfo.iDriveAtt), TInt(aDriveInfo.iMediaAtt));

    switch (aDriveInfo.iBattery)
        {
        case EBatLow:
            aBuffer.Append(KBatLow);
            break;
        case EBatGood:
            aBuffer.Append(KBatGood);
            break;
        default:
            aBuffer.Append(KBatNotSupported);
        }

    switch (aDriveInfo.iType)
            {
        case EMediaNotPresent:
            aBuffer.Append(KNotPresent);            
            break;
        case EMediaFloppy:
            aBuffer.Append(KFloppy);
            break;
        case EMediaHardDisk:   
            aBuffer.Append(KHard);
            break;
        case EMediaCdRom:
            aBuffer.Append(KCDROM);
            break;
        case EMediaRam:
            aBuffer.Append(KRam);
            break;
        case EMediaFlash:
            aBuffer.Append(KFlash);
            break;
        case EMediaRom:
            aBuffer.Append(KRom);
            break;
        case EMediaRemote:
            aBuffer.Append(KRemote);
            break;
        case EMediaNANDFlash:
            aBuffer.Append(KNANDFlash);
            break;
        default: 
            aBuffer.Append(KUnknown);

        }
        aBuffer.Append(KDriveAtts);
        if (aDriveInfo.iDriveAtt & KDriveAttLocal)
           aBuffer.Append(KLocal);
        if (aDriveInfo.iDriveAtt & KDriveAttRom)
            aBuffer.Append(KROMDrive);
       if (aDriveInfo.iDriveAtt & KDriveAttRedirected)
           aBuffer.Append(KRedirected);
        if (aDriveInfo.iDriveAtt & KDriveAttSubsted)
           aBuffer.Append(KSubstituted);
        if (aDriveInfo.iDriveAtt & KDriveAttInternal)
           aBuffer.Append(KInternal);
        if (aDriveInfo.iDriveAtt & KDriveAttRemovable)
           aBuffer.Append(KRemovable);
        aBuffer.Append(KMediaAtts);
        if (aDriveInfo.iMediaAtt & KMediaAttVariableSize)
            aBuffer.Append(KDynamic);
        if (aDriveInfo.iMediaAtt & KMediaAttDualDensity)
            aBuffer.Append(KDual);
        if (aDriveInfo.iMediaAtt & KMediaAttFormattable)
            aBuffer.Append(KFormattable);
        if (aDriveInfo.iMediaAtt & KMediaAttWriteProtected)
            aBuffer.Append(KWriteProtected);
        if (aDriveInfo.iMediaAtt & KMediaAttLockable)
            aBuffer.Append(KLockable);
        if (aDriveInfo.iMediaAtt & KMediaAttLocked)
            aBuffer.Append(KLocked);
        if (aDriveInfo.iMediaAtt & KMediaAttHasPassword)
            aBuffer.Append(KHasPassword);
        aBuffer.Append(KNewLine);
    }

void FormatVolumeInfo(TDes& aBuffer, const TVolumeInfo aVolumeInfo)
    {
    // Append volume information to aBuffer
    _LIT(KUID,"Unique ID: %08x\n");
    _LIT(KSize,"Size: %Ld bytes\n");
    _LIT(KFree,"Free space: %Ld bytes\n");
    _LIT(KVolName,"Volume name: %S\n");
    aBuffer.AppendFormat(KUID,aVolumeInfo.iUniqueID);
    aBuffer.AppendFormat(KSize,aVolumeInfo.iSize);
    aBuffer.AppendFormat(KFree,aVolumeInfo.iFree);
    aBuffer.AppendFormat(KVolName,&aVolumeInfo.iName);
    }
// DriveInfo.mmp
//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.

// using relative paths for source and userinclude directories

// No explicit capabilities required to run this.

TARGET        DriveInfo.exe
TARGETTYPE    exe
UID           0
VENDORID 0x70000001

SOURCEPATH    .
SOURCE        DriveInfo.cpp

USERINCLUDE   .
USERINCLUDE   ..\..\CommonFramework
SYSTEMINCLUDE \Epoc32\include

LIBRARY       euser.lib efsrv.lib

CAPABILITY    None
// BLD.INF
// Component description file
//
// Copyright (C) Symbian Software Ltd 2000-2005.  All rights reserved.


PRJ_MMPFILES

DriveInfo.mmp

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Description

The DriveInfo example retrieves a list of the available drives, the type of media present in each drive, the media and drive attributes and volume information.

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Classes used

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