Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

free disk space

Posted on 2001-08-07
1
641 Views
Last Modified: 2013-12-26
i need a function in c that takes as a parameter a pathname. using this the function needs to return the free disk space in bytes of the volume that contains the passed in path.

i have used the sample code from FullPath.c, which i found included with the Metroworks compiler as well as on Apple's website itself. however, this code does not work with macOS8.6.

i need this routine to work with macOS8.6 and 9.0.
my routine only uses carbon compatible stuff and yet it fails.

--------------- here is what i tried (note: some things are defined elsewhere UINT32, UINT64, etc)

UINT32 diskFreeSpace( const TCHAR *szPath ) {
     OSErr result;
     FSSpec spec;
     AliasHandle alias;
     Boolean wasChanged;
     Str32 nullString;
     FSVolumeInfo volInfo;
     UINT64 freeBytes = 0;
     nullString[ 0 ] = 0;
     result = NewAliasMinimalFromFullPath( strlen( szPath ), szPath, nullString, nullString, &alias );
printf( "NewAliasMinimalFromFullPath (result = %d)\n", result );
     if( result == noErr ) {
          result = ResolveAlias(NULL, alias, &spec, &wasChanged);
printf( "ResolveAlias (result = %d)\n", result );
          if( spec.vRefNum == 0 ) {
               spec.parID = 0;
               spec.name[0] =  0;
          }
          DisposeHandle((Handle)alias);
          result = FSGetVolumeInfo( spec.vRefNum, 0, NULL, kFSVolInfoBlocks, &volInfo, NULL, NULL );
printf( "FSGetVolumeInfo (result = %d)\n", result );
          if( result == noErr ) {
printf( "blocksize = %d\nfreeblocks = %d\n", volInfo.blockSize, volInfo.freeBlocks );
               freeBytes = (UINT64)(volInfo.blockSize) * (UINT64)(volInfo.freeBlocks);
               if( freeBytes > (UINT64)0xffffffff ) return (UINT32)0xffffffff;
               return (UINT32)freeBytes;
          }
     }
     return 0;
}

----------------- this is the (correct) output on macOS9.0

path = "Macintosh HD:Desktop Folder:FreeSpaceTest:"
NewAliasMinimalFromFullPath (result = 0)
ResolveAlias (result = 0)
FSGetVolumeInfo (result = 0)
blocksize = 4096
freeblocks = 4421296

----------------- this is the (failed) output on macOS8.6

path = "Macintosh HD:Desktop Folder:FreeSpaceTest:"
NewAliasMinimalFromFullPath (result = 0)
ResolveAlias (result = 0)
FSGetVolumeInfo (result = -50)

0
Comment
Question by:musashi
1 Comment
 

Accepted Solution

by:
dioncrannitch earned 300 total points
ID: 7084855
I think the problem here is that FSGetVolumeInfo (and all the other FSXXX calls) only works on Mac OS 9 and higher. You can tell because in the header information it says it is available "in InterfaceLib 9.0 and later".

I use PBXGetVolInfoSync like this:

     paramBlock.ioNamePtr = nil;
     paramBlock.ioVRefNum = vRef;
     paramBlock.ioXVersion = 0;
     paramBlock.ioVolIndex = 0;

     result = PBXGetVolInfoSync(&paramBlock);
     if (result == noErr)
          freeBytes = paramBlock.ioVFreeBytes;

which should work on 8.5 and higher.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
deburging in oracle form 12 104
post4 challenge 28 104
building a service to accessed via telnet client, want colors ? 4 92
Not needed 13 119
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question