How to check free space on memory card

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ID	...	Creation date	2008 November
Platform	S60 3rd,3rd FP1, 3rd Fp2	Tested on devices	N78
Category	Symbian C++	Subcategory	General

Keywords (APIs, classes, methods, functions): keywords=TDriveInfo,TDriveInfo::Drive(),TDriveInfo::Volume()

Overview

This snippet can be self-signed.

Use case

If the user application needs to write a big file into the memory card, the application should check the available free space before the operation. The following snippet provides a solution to this.

Source file

//necessary library
LIBRARY efsrv.lib

//necessary header file
#include <f32file.h>
 
RFs fileSession;
TVolumeInfo volumeInfo;
 
//open RFs session
fileSession.Connect();
 
//freeSpace will store number of free memory card in Bytes
TBuf<64> freeSpace;
TInt64 freeKBytes;
//Contains drive information.
TDriveInfo driveInfo;
 
//check all drives from A to Z
for (TInt driveNumber=EDriveA; driveNumber<=EDriveZ; driveNumber++)
    {
    //Gets information of this drive 
    fileSession.Drive(driveInfo,driveNumber);
 
    //if this drive is EMediaNANDFlash,we find drive of Memory card
    // also reported my DiBo Members that on some devices it can be EMediaHardDisk 
    // ref: [http://discussion.forum.nokia.com/forum/showthread.php?t=156990]
    if(driveInfo.iType == EMediaNANDFlash)
       {
       //recode its free space in bytes
       fileSession.Volume(volumeInfo,driveNumber); 
       freeKBytes = volumeInfo.iFree/1024;
       freeSpace.Num(freeKBytes);         	
       break; 
       }
    }
 
....
//close RFs session
fileSession.Close();

Postconditions

The freeSpace variable the free memory space in bytes, on the memory card.

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