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Re: Determining the size of a directory Part 3

Why aren't you using fts? Someone posted an example in the last thread.

-- Finlay


On Sun, 31 Oct 2004 14:12:58 +0100, Dominik Freyer <email@hidden> wrote:
> Hi there,
> I'm still trying to determine directory sizes for big filesystem trees.
> I've been running about a problem I couldn't get rid of. My function
> that uses the du tool in a NSTask to get the size of a file or dir runs
> most of the time very well. If the file that has to be size-determined
> is a symbolic link the size will be 4 (which is correct) and gets
> returned, but after returning to the calling method all variables of
> this method are empty and I get an EXC_BAD_ACCESS. I know, that I get
> this, because I'm trying to access some values of the no more available
> variables. This behaviour doesn't appear, if a directory or every other
> file is determined.
> I got rid of this problem by testing the file-type and ignoring
> symbolic links, but I found the same problem with a file in my
> ~/Library/Application Support/Adress Book/images Folder called
> 6D35A9EE-063A-11D8-9905-0030657AB734. It is a 4 KB file (the same size
> of a symbolic link) but not shown as a link in Finder or Terminal. Here
> the both important methods:
>
> This method uses du as a NSTask and returns the determined size to the
> calling method
>
> - (NSNumber*)getSizeOfDirectory:(NSString*)path
> {
> NSNumber *sizeField;
> if([[[NSFileManager defaultManager] fileAttributesAtPath:path
> traverseLink:NO]fileType]!=NSFileTypeSymbolicLink ||
> [[[NSFileManager defaultManager] fileAttributesAtPath:path
> traverseLink:NO]fileType]!=NSFileTypeUnknown)
> {
> NSArray *args;
> NSPipe *fromPipe;
> NSFileHandle *fromDu;
> NSData *duOutput;
> NSString *size;
> NSArray *stringComponents;
> unsigned char aBuffer[70];
>
> args = [NSArray arrayWithObjects:@"-ks",path,nil];
> fromPipe=[NSPipe pipe];
> fromDu=[fromPipe fileHandleForWriting];
> NSTask *duTool=[[NSTask alloc]init];
>
> [duTool setLaunchPath:@"/usr/bin/du"];
> [duTool setStandardOutput:fromDu];
> [duTool setArguments:args];
> [duTool launch];
> duOutput=[[fromPipe fileHandleForReading] availableData];
> [duOutput getBytes:aBuffer];
> size=[NSString stringWithCString:aBuffer];
> stringComponents=[size pathComponents];
> size=[stringComponents objectAtIndex:0];
> size=[size substringToIndex:[size length]-1];
> return sizeField =[NSNumber numberWithUnsignedLongLong:(unsigned
> long long)[size doubleValue]];
> }
> else return sizeField=[NSNumber
> numberWithUnsignedLongLong:(unsigned long long)0];
> }
>
> This is the calling method which calls getSizeOfDirectory.
> - (void)drawSequoiaField:(int)x y:(int)y xdelta:(int)xdelta
> ydelta:(int)ydelta givenPath:(NSString*)givenPath
> sizeOfParent:(unsigned long long)sizeOfParent
> {
> if([[NSFileManager defaultManager] fileExistsAtPath:givenPath])
> {
> NSArray *pathContents = [[NSFileManager defaultManager]
> directoryContentsAtPath:givenPath];
> NSString *dirContent,*completePath;
> NSNumber *sizeOfChosenObject;
> int i,xvalue,ratio;
> xvalue=x;
> for(i=0;i<[pathContents count];i++)
> {
> dirContent = [pathContents objectAtIndex:i];
> completePath = [givenPath stringByAppendingString:dirContent];
> sizeOfChosenObject = [self getSizeOfDirectory:completePath];
> ratio = [sizeOfChosenObject unsignedLongLongValue] * xdelta /
> sizeOfParent;
> NSLog(completePath);
> [self lockFocus];
> [NSBezierPath strokeRect:NSMakeRect(xvalue,0,ratio,xdelta)];
> [self unlockFocus];
> xvalue=xvalue+ratio;
>
> if([[[NSFileManager defaultManager] fileAttributesAtPath:[[givenPath
> stringByAppendingString:dirContent] stringByAppendingString:@"/"]
> traverseLink:NO]fileType]==NSFileTypeDirectory)
> [self drawSequoiaField:xvalue
> y:0
> xdelta:0
> ydelta:0
> givenPath:[[givenPath stringByAppendingString:dirContent]
> stringByAppendingString:@"/"]
> sizeOfParent:[sizeOfChosenObject unsignedLongLongValue]];
> }
> }
> }
>
> Another smaller problem I have is a small memory leak I have in
> getSizeOfDirectory or drawSequoiaField. I found this with MallocDebug,
> but couldn't get the problem. Does anybody see it?
> Is it right that every class that begins with a NS (like NSString,
> NSNumber or NSArray) is already autoreleased?
>
> Thanks for your help in advance
> Dominik
>
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References: 
 >Determining the size of a directory Part 3 (From: Dominik Freyer <email@hidden>)



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