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02.21.2008 at 09:37PM PST, ID: 23183623 | Points: 500
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Convert bytes to kb/mb

Asked by TheMaximumWeasel in Cocoa Programming Language, Miscellaneous Programming, Objective-C Programming Language

I have an integer that holds an amount of bytes. How would I make a function that returns an NSString with a value of kb or mb depending on what is appropriate.

So if the value of bytes is over 1024 show in KB and if its over 1024 KB show it in MB. Also I need it to round to one decimal place.

Examples:
55803 returns @"54.5 KB"
3671316 returns @"3.5 MB"
362 returns @"362 B" <- No decimals if in bytes :p

Thanks,
MaxStart Free Trial
[+][-]02.21.2008 at 09:48PM PST, ID: 20954968

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[+][-]02.22.2008 at 04:23AM PST, ID: 20956511

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02.21.2008 at 09:48PM PST, ID: 20954968
enrique_salazar:
Simple, divide it by 1024 recursively, until the result is less than zero (0) then show the previous result

3671316 / 1024 = 3585,26953125 / 1024 = 3,501239776611328125

3,501239776611328125 /1024 = 0,0034191794693470001220703125

then you show 3,501239776611328125, but you can round it to decimal parts, then: 3.5

Count the number of times you divide, for the first division append the KB, for the second, append MB, for the third GB, and so...

 
02.21.2008 at 10:00PM PST, ID: 20955008
TheMaximumWeasel:
how does divinding make a number less than 0? Can you write the function? I am a beginner at this.

Max
 
02.22.2008 at 04:23AM PST, ID: 20956511
enrique_salazar:
sry!
no less than zero, less than 1.

my bad.
 
02.22.2008 at 08:43PM PST, ID: 20963700
TheMaximumWeasel:
ok this instance method compiles perfectly, but it does not work and I can't figure it out.
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- (NSString *)reduceBytes:(long long)bytes {
	int type = 0;
	long long reducedBytes = bytes;
	while(reducedBytes > 1024) {
		reducedBytes = bytes / 1024;
		type++;
	}
	NSString *returnString;
	switch(type) {
		case 0:
			returnString = [ NSString stringWithFormat: @"%lld", reducedBytes ];
			break;
		case 1:
			returnString = [ NSString stringWithFormat: @"%f KB", (float)(((int)(reducedBytes * 10)) /10) ];
			break;
		case 2:
			returnString = [ NSString stringWithFormat: @"%f MB", (float)(((int)(reducedBytes * 10)) /10) ];
			break;
		case 3:
			returnString = [ NSString stringWithFormat: @"%f GB", (float)(((int)(reducedBytes * 10)) /10) ];
			break;
	}
	return returnString;
}
Open in New Window
 
02.23.2008 at 04:22AM PST, ID: 20964683
enrique_salazar:
1. is not reducedbytes>1024, is reducedbytes>1

2. between line 4 and 5 add prev_reducedBytes=reducedBytes;
3. Line 5 Should be reducedBytes=reducedBytes / 1024;
4. between line 7 and 8 add type=type-1;   since the while will add an extra type cause will check in the next loop.

5. Inside the case, use pre_reducedBytes instead of reducedBytes.

Hope it works
 
02.23.2008 at 07:18AM PST, ID: 20965209
TheMaximumWeasel:
if I check to see if its greater than 1024, I don't have to do the prev_reducedBytes or the type-1 crap.

Max
 
02.23.2008 at 08:07AM PST, ID: 20965393
enrique_salazar:
It is not crap, be more respectful with someone trying to help.
 
02.23.2008 at 09:03AM PST, ID: 20965637
TheMaximumWeasel:
No, I wasn't trying to insult you, I am sorry. When I mean crap I mean like extra code that is not needed.

Max

Here is what I got working:
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NSString *reduceBytes(unsigned long bytes) {
	const char *suffixTable[] = {"bytes", "KB", "MB", "GB", "TB", NULL};
	/*
	if (bytes == 1) {
		return @"1 byte";
	}
	*/
	int suffixIdx = 0;
	double reducedBytes = (double)bytes;
	while (reducedBytes >= 1000.0 && suffixTable[suffixIdx + 1] != NULL) {
		suffixIdx++;
		reducedBytes /= 1024.0;
	}
	return [ NSString stringWithFormat: @"%.1f %s", reducedBytes, suffixTable[suffixIdx] ];
}
Open in New Window
 
02.25.2008 at 04:11PM PST, ID: 20980602
enrique_salazar:
np ;)

a little translation misunderstanding
 
02.26.2008 at 08:30AM PST, ID: 20985835
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