Re: Copying large files with progress indicator

FROM : Mike Abdullah
DATE : Tue Aug 01 17:38:19 2006

On 1 Aug 2006, at 02:33, Adam R. Maxwell wrote:

>
> On Jul 31, 2006, at 17:06, Mike Abdullah wrote:
>

>> OK, that rather surprises me - why haven't Apple done a decent 
>> file copying system in Cocoa yet!  Maybe I should file a request.
>>
>> So, I downloaded MoreFilesX.  It's readme says quite a bit about 
>> the HFD+ APIs.  Am I right in thinking that the code will use the 
>> HFS+ if suitable, but that it will still work for non-HFS+ 
>> operations?

>
> You might want to look at FSCopyObject; I think it's more modern 
> (and easier to use) than MoreFilesX <http://developer.apple.com/

> samplecode/FSCopyObject/index.html>.  It loses xattrs on 10.4, 
> though, unfortunately.
>
> If you can require 10.4, take a look at FSCopyObjectAsync, which 
> has a callback for periodic updates.  These functions are only 
> documented in the Files.h header, though.
>
> -- Adam
>


10.4 only is fine for me.  I've had a look at FSCopyObjectAsync, and 
after a search around, found Apple's nice FSFileOperation sample code:

http://developer.apple.com/samplecode/FSFileOperation/

I've got a quick simple project up and running using this, however, I 
wonder if someone could help clarify something for me.  My code is:

- (IBAction)doCopy:(id)sender
{
   OSStatus err;
   FSRef  sourceFileRef, destinationDirectoryRef;
   
   // Build the parameters
   FSFileOperationRef fileOp = FSFileOperationCreate(kCFAllocatorDefault);
   
   FSPathMakeRef((UInt8 *)[@"/Users/dev/Desktop/test.dmg" 
fileSystemRepresentation], &sourceFileRef, NULL);
   
   FSPathMakeRef((UInt8 *)[@"/Users/dev/Desktop/Copy/" 
fileSystemRepresentation], &destinationDirectoryRef, NULL);
   
   OptionBits options = kFSFileOperationDefaultOptions;
   
   
   // Do the copy
   err = FSCopyObjectAsync(fileOp, &sourceFileRef, 
&destinationDirectoryRef, NULL, options, NULL, 0.01, NULL);
   
   while (YES)
   {
   CFRunLoopRunInMode(kCFRunLoopDefaultMode, 5.0, true);
   
   CFDictionaryRef infoDict2;
   (void) FSFileOperationCopyStatus(fileOp, NULL, NULL, &err, 
&infoDict2, NULL);
   
   NSLog(@"%@", (NSDictionary *)infoDict2);
   }
}

Now obviously, I need to do this in a separate thread which isn't a 
problem.  However, what I don't really understand is what exactly 
goes on with the CFRunLoopRunInMode call.  It seems that during the 
duration of this method, that's when a chunk of file copying is 
actually done, but once I stick the code in a thread, should I really 
use this, or is there something better?

Mike.