I've written methods that help me get the size of files/folders and translate the result in a human readable string. Problem is, when this size exceeds about 2.1GB, the number returned changes to a random negative number, like "-4324234423 bytes", which is useless.
Things I've found out about & done about this issue:
32GB is limited to this size, so I compile in 64bit instead.
I've tried using both CGFloat and NSUInteger, but both still return the same value as NSInteger.
I am quite frustrated, I don't know what I am missing. Here are my methods:
- (NSString *)stringFromFileSize:(int)theSize
{
CGFloat floatSize = theSize;
if (theSize<1023)
return([NSString stringWithFormat:#"%i bytes",theSize]);
floatSize = floatSize / 1024;
if (floatSize<1023)
return([NSString stringWithFormat:#"%1.1f KB",floatSize]);
floatSize = floatSize / 1024;
if (floatSize<1023)
return([NSString stringWithFormat:#"%1.2f MB",floatSize]);
floatSize = floatSize / 1024;
return([NSString stringWithFormat:#"%1.2f GB",floatSize]);
}
- (NSUInteger)sizeOfFile:(NSString *)path
{
NSDictionary *fattrib = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
NSUInteger fileSize = (NSUInteger)[fattrib fileSize];
return fileSize;
}
- (NSUInteger)sizeOfFolder:(NSString*)folderPath
{
NSArray *contents;
NSEnumerator *enumerator;
NSString *path;
contents = [[NSFileManager defaultManager] subpathsAtPath:folderPath];
enumerator = [contents objectEnumerator];
NSUInteger fileSizeInt = 0;
while (path = [enumerator nextObject]) {
NSDictionary *fattrib = [[NSFileManager defaultManager] attributesOfItemAtPath:[folderPath stringByAppendingPathComponent:path] error:nil];
fileSizeInt +=[fattrib fileSize];
}
return fileSizeInt;
}
What am I missing? Is NSFileManager returning a 32bit value? What's causing this?
Thanks!
Alas, nearly all systems have "int" being 32-bit, even if you "compile for 64-bit". (Windows, Mac and Linux work this way). See http://en.wikipedia.org/wiki/64-bit#Specific_C-language_data_models.
You can either pass long to your stringFromFileSize method, or you can pass a NSUInteger.
A little bit late, but you can use this single line with the right number formatter:
NSString *fileSizeStr = [NSByteCountFormatter stringFromByteCount:fileSize countStyle:NSByteCountFormatterCountStyleFile];
Related
I really need you guy HELP , I run my program in Xcode and its successful but later,
Its show me this error: **Thread 1: Program received signal :"EXC_BAD_ACCESS" on my program line that I have **bold below :
- (NSString *) ocrImage: (UIImage *) uiImage
{
CGSize imageSize = [uiImage size];
double bytes_per_line = CGImageGetBytesPerRow([uiImage CGImage]);
double bytes_per_pixel = CGImageGetBitsPerPixel([uiImage CGImage]) / 8.0;
CFDataRef data = CGDataProviderCopyData(CGImageGetDataProvider([uiImage CGImage]));
const UInt8 *imageData = CFDataGetBytePtr(data);
// this could take a while. maybe needs to happen asynchronously.
**char* text = tess->TesseractRect(imageData,(int)bytes_per_pixel,(int)bytes_per_line, 0, 0,(int) imageSize.height,(int) imageSize.width);**
// Do something useful with the text!
NSLog(#"Converted text: %#",[NSString stringWithCString:text encoding:NSUTF8StringEncoding]);
return [NSString stringWithCString:text encoding:NSUTF8StringEncoding];
}
Thank you guy .
make sure that imageData is not NULL here. That's the most common cause of what you're seeing. You should reconsider your title to something more related to your problem, and focus on the stacktrace and all the variables you are passing to TesseractRect().
The other major likelihood is that tess (whatever that is) is a bad pointer, or that is not part of the correct C++ class (I assume this is Objective-C++; you're not clear on any of that).
- (NSString *)readAndProcessImage:(UIImage *)uiImage
{
CGSize imageSize = [uiImage size];
int bytes_per_line = (int)CGImageGetBytesPerRow([uiImage CGImage]);
int bytes_per_pixel = (int)CGImageGetBitsPerPixel([uiImage CGImage]) / 8.0;
CFDataRef data =
CGDataProviderCopyData(CGImageGetDataProvider([uiImage CGImage]));
const UInt8 *imageData = CFDataGetBytePtr(data);
// this could take a while. maybe needs to happen asynchronously?
char *text = tess.TesseractRect(imageData, bytes_per_pixel, bytes_per_line, 0,
0, imageSize.width, imageSize.height);
NSString *textStr = [NSString stringWithUTF8String:text];
delete[] text;
CFRelease(data);
return textStr;
}
I'm using the following code to encrypt files in cocoa:
- (NSData *)AES256EncryptWithKey:(NSString *)key
{
// 'key' should be 32 bytes for AES256, will be null-padded otherwise
char keyPtr[kCCKeySizeAES256 + 1]; // room for terminator (unused)
bzero( keyPtr, sizeof( keyPtr ) ); // fill with zeroes (for padding)
// fetch key data
[key getCString:keyPtr maxLength:sizeof( keyPtr ) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
//See the doc: For block ciphers, the output size will always be less than or
//equal to the input size plus the size of one block.
//That's why we need to add the size of one block here
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc( bufferSize );
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt( kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
keyPtr, kCCKeySizeAES256,
NULL /* initialization vector (optional) */,
[self bytes], dataLength, /* input */
buffer, bufferSize, /* output */
&numBytesEncrypted );
if( cryptStatus == kCCSuccess )
{
//the returned NSData takes ownership of the buffer and will free it on deallocation
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free( buffer ); //free the buffer
return nil;
}
And wrote this for the connection to the file:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"foo" ofType:#"rtf"];
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSString *key = [withFileKey stringValue];
NSString *newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSString *encrypted = [newStr AES256EncryptWithKey:key];
NSLog(#"File encryption:%#", encrypted);
[filePathName setStringValue:filePath];
if (!data) {
NSLog(#"Unable to read file");
}
Basically what I did was first of all get the filepath of the file the user wants. Then convert the data in the file to a string. Then encrypt that string with the AES256EncryptWithKey: method. However, when I decrypt a plain text file for example, it returns a bunch of garbage like fonts and all that stuff, then the few lines I wrote. Something like this:
\ansicpg1252\cocoartf1138\cocoasubrtf100
{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fnil\fcharset0 Menlo-Bold;}
{\colortbl;\red255\green255\blue255;}
\margl1440\margr1440\vieww10800\viewh8400\viewkind0
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural
\f0\fs24 \cf0 Hello my name is bobby bob\
\
\pard\tx560\pardeftab560\pardirnatural
\f1\b\fs22 \cf0 \CocoaLigature0 YAY!\
and I am awesome!!}
Shouldn't I be taking the data and then encrypting that (conversion to bytes), then convert the encrypted data and convert it to a string to display? I tried something like that but it didn't work. :(
Something like:
NSData *encryptedData = [data AES256EncryptWithKey:yourkey];
And then:
NSString *convertData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
?
Your help is greatly appreciated. Thanks!
Your code appears hard-coded to load foo.rtf. This looks like an RTF file. Where is the "plain text file" you're talking about?
EDIT We had a lot of discussion on this, so I wrote up a blog post about how to correctly use CCCrypt().
I’m trying to upload a video of size 100MB through Asset Library. But when i try to use -(NSUInteger)getBytes:(uint8_t *)buffer fromOffset:(long long)offset length:(NSUInteger)length error:(NSError **)error of ALAssetRepresentation I get memory full error. I also need to put the data in buffer to NSData. How can i achieve that?
I tried this way:
Byte *buffer = (Byte*)malloc(asset.defaultRepresentation.size);
NSUInteger k = [asset.defaultRepresentation getBytes:buffer fromOffset: 0.0
length:asset.defaultRepresentation.size error:nil];
NSData *adata = NSData *adata = [NSData dataWithBytesNoCopy:buffer
length:j freeWhenDone:YES];
It really works!
As #runeb said the answer is not working properly with large files. You should do something like that:
int bufferSize = 2048;
int offset = 0;
NSString* name=nil;
while(offset<asset.size){
Byte *buffer = (Byte*)malloc(bufferSize);
NSUInteger buffered = [asset getBytes:buffer fromOffset:offset length:bufferSize error:nil];
NSData *data;
data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:NO];
if(!name){
//Creates the file and gives it a unique name
name = [FileUtils saveVideoFromAsset:data];
}
else{
//Append data to the file created...
[FileUtils appendData:data toFile:name];
}
offset+=buffered;
free(buffer);
}
In order to append data to a file you can use that:
NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:filePath];
[myHandle seekToEndOfFile];
[myHandle writeData:videoData];
I hope that helps!
ust add #autoreleasepool block, so that any autorleased objects should be cleaned up. it looks like that ARC has something changed after iOS7
#autoreleasepool {
NSUInteger readStatus = [rep getBytes:buffer fromOffset:_startFromByte length:chunkSize error:NULL];
}
I am getting random malloc crashes in stringByReplacingOccurrencesOfString. I've noticed that it crashes on longer strings, but I can't seem to find why. What could be the problem?
The error:
CashTrader(53448,0xb0103000) malloc: *** error for object 0x5c5eca0: incorrect checksum for freed object - object was probably modified after being freed.
Input encryptedparams
raStwjnw9uiOEHzF00UazOUp879zUuLwJ6J300BH2DMH29Pww/4mOR3oHXv4F/CL
Sample Code:
-(NSURL *)createReqUrl:(NSString *)hostString secure:(BOOL)usessl urlRoot:(NSString*)urlRoot encryptedParam:(NSString *)encryptedparams{
NSString *encryptString;
encryptString = nil;
encryptString = [encryptedparams stringByReplacingOccurrencesOfString:#"+" withString:#"%%2b"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"/" withString:#"%%2f"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"=" withString:#"%%3d"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"#" withString:#"%%40"];
NSString *answer = [[NSString alloc] initWithString:urlRoot];
answer = [[answer stringByAppendingString:encryptString] stringByReplacingOccurrencesOfString:#"%%" withString:#"%"];
NSString *scheme = nil;
if (usessl)
scheme = #"https://";
else
scheme = #"http://";
return [[NSURL alloc] initWithString:[[scheme stringByAppendingString:hostString] stringByAppendingString:answer]];;
}
I do believe your encryptString should be NSMutableString.
(have searched, but not been able to find a simple solution to this one either here, or in Cocoa docs)
Q. How can I trim all leading whitespace only from an NSString? (i.e. leaving any other whitespace intact.)
Unfortunately, for my purposes, NSString's stringByTrimmingCharactersInSet method works on both leading and trailing.
Mac OS X 10.4 compatibility needed, manual GC.
This creates an NSString category to do what you need. With this, you can call NSString *newString = [mystring stringByTrimmingLeadingWhitespace]; to get a copy minus leading whitespace. (Code is untested, may require some minor debugging.)
#interface NSString (trimLeadingWhitespace)
-(NSString*)stringByTrimmingLeadingWhitespace;
#end
#implementation NSString (trimLeadingWhitespace)
-(NSString*)stringByTrimmingLeadingWhitespace {
NSInteger i = 0;
while ((i < [self length])
&& [[NSCharacterSet whitespaceCharacterSet] characterIsMember:[self characterAtIndex:i]]) {
i++;
}
return [self substringFromIndex:i];
}
#end
This is another solution using Regular Expressions (requires iOS 3.2):
NSRange range = [string rangeOfString:#"^\\s*" options:NSRegularExpressionSearch];
NSString *result = [string stringByReplacingCharactersInRange:range withString:#""];
And if you want to trim the trailing whitespaces only you can use #"\\s*$" instead.
This code is taking blanks.
NSString *trimmedText = [strResult stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(#"%#",trimmedText);
Here is a very efficient (uses CoreFoundation) way of doing it (Taken from kissxml):
- (NSString *)trimWhitespace {
NSMutableString *mStr = [self mutableCopy];
CFStringTrimWhitespace((CFMutableStringRef)mStr);
NSString *result = [mStr copy];
[mStr release];
return [result autorelease];
}
NSString *myText = #" foo ";
NSString *trimmedText = [myText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSLog(#"old = [%#], trimmed = [%#]", myText, trimmedText);
Here's what I would do, and it doesn't involve categories!
NSString* outputString = inputString;
NSRange range = [inputString rangeOfCharacterFromSet: [NSCharacterSet whitespaceCharacterSet]
options:0];
if (range.location == 0)
outputString = [inputString substringFromIndex: range.location + range.length];
This is much less code.
I didn't really have much time to test this, and I'm not sure if 10.4 contains the UTF8String method for NSString, but here's how I'd do it:
NSString+Trimming.h
#import <Foundation/Foundation.h>
#interface NSString (Trimming)
-(NSString *) stringByTrimmingWhitespaceFromFront;
#end
NSString+Trimming.m
#import "NSString+Trimming.h"
#implementation NSString (Trimming)
-(NSString *) stringByTrimmingWhitespaceFromFront
{
const char *cStringValue = [self UTF8String];
int i;
for (i = 0; cStringValue[i] != '\0' && isspace(cStringValue[i]); i++);
return [self substringFromIndex:i];
}
#end
It may not be the most efficient way of doing this but it should work.
str = [str stringByReplacingOccurrencesOfString:#" " withString:#""];