I have a problem with the next code:
NSDictionary * imagen = [[NSDictionary alloc] initWithDictionary:[envio resultValue]];
NSString *imagenS = [imagen valueForKey:#"/Result"];
ClaseMaestra *b1 = [[ClaseMaestra alloc]init];
NSData *imagenDecode = [[NSData alloc] initWithData:[b1 base64DataFromString:imagenS]];
NSLog(#"Decode Image:");
NSLog(#"%#", imagenDecode);
//SAVE IMAGE
NSArray *sysPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *docDirectory = [sysPaths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#david.png",docDirectory];
[imagenDecode writeToFile:filePath atomically:YES];
Blockquote
[envio resultValue] --> return a NSDictionary with one image in Base 64 codification.
I want decoder and save this image but in my console I have showed this message:
2011-08-23 19:19:39.750 WSStub[38501:a0f] *************************
2011-08-23 19:19:39.752 WSStub[38501:a0f] SendImage
2011-08-23 19:19:39.752 WSStub[38501:a0f] *************************
2011-08-23 19:19:39.759 WSStub[38501:a0f] -[ClaseMaestra base64DataFromString:]: unrecognized selector sent to instance 0xd00ad0
Program received signal: “EXC_BAD_ACCESS”.
ClaseMaestra interface is:
#import <Foundation/Foundation.h>
#class NSString;
#interface ClaseMaestra : NSObject
+ (NSMutableData *)base64DataFromString: (NSString *)string;
#end
I can´t understand the "unrecognized selector" error...
This is a class method and you call iton an instance of the class. You should either change it to an instance method. instead of:
+ (NSMutableData *)base64DataFromString: (NSString *)string;
Use:
- (NSMutableData *)base64DataFromString: (NSString *)string;
Or, change the call, instead of:
NSData *imagenDecode = [[NSData alloc] initWithData:[b1 base64DataFromString:imagenS]];
Use:
NSData *imagenDecode = [[NSData alloc] initWithData:[ClaseMaestra base64DataFromString:imagenS]];
What to choose depends on your needs.
base64DataFromString: is a class method (starts with a +). So instead of
ClaseMaestra *b1 = [[ClaseMaestra alloc]init];
NSData *imagenDecode = [[NSData alloc] initWithData:[b1 base64DataFromString:imagenS]];
You should do
NSData *data = [ClaseMaestra base64DataFromString:imagenS];
You are sending a class message to an instance. The receiver should be a class.
So do:
NSData *imagenDecode = [[NSData alloc] initWithData:[ClaseMaestra base64DataFromString:imagenS]];
You'll also get this error if you use the name of a private framework, eg: MPMovieView .Everyone knows you're not supposed to use those, but what I didn't know is that I was using one!
What's odd is, if you use Xibs, they load the system one and give you the same type of error (Class methods).
But if you load it in code, it shadows the system framework one. I spent a decent hour scratching my head, ensuring everything was hooked up right... it was, just needed to change how I named my custom stuff. Posting this for anyone with similar
Related
I want to parse a .csv file. For this I use the CHCSV Parser. But when I push into the view where the parser should start parsing, the app crashes.
Terminating app due to uncaught exception 'NSMallocException', reason:
'* -[NSConcreteMutableData appendBytes:length:]: unable to allocate
memory for length (4294967295)'
NSString *filePath = #"http://somewhere.com/test.csv";
NSString *fileContent = [NSString stringWithContentsOfURL:[NSURL URLWithString:filePath] encoding:NSUTF8StringEncoding error:nil];
self.csvParser = [[CHCSVParser alloc] initWithContentsOfCSVFile:fileContent];
Edit:
I'm developing for iOS 6+. Thanks for the great comments and answers. I hope to get the right solution.
Input Stream
It doesn't work. When I want to work with the input stream the app crashes because of the wrong encoding.
Incompatible integer to pointer conversion sending 'int' to
parameter of type 'NSStringEncoding *' (aka 'unsigned int *')
NSData *downloadData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://example.com/test.csv"]];
NSInputStream *stream = [NSInputStream inputStreamWithData:downloadData];
self.csvParser = [[CHCSVParser alloc] initWithInputStream:stream usedEncoding:NSUTF8StringEncoding delimiter:#";"];
self.csvParser.delegate = self;
[self.csvParser parse];
CSV-String
NSString *filePath = #"http://example.com/test.csv";
NSString *fileContent = [NSString stringWithContentsOfURL:[NSURL URLWithString:filePath] encoding:NSUTF8StringEncoding error:nil];
self.csvParser = [[CHCSVParser alloc] initWithCSVString:fileContent];
self.csvParser.delegate = self;
[self.csvParser parse];
This parse only (null).
Final Edit: Dave, the author of CHCSVParser, updated his code on github, so this problem should be solved when you use the most recent version. Get it now!
Okay, here we go:
First add the following code in CHCSVParser.m:
In method - (void)_sniffEncoding at the very beginning you have:
uint8_t bytes[CHUNK_SIZE];
NSUInteger readLength = [_stream read:bytes maxLength:CHUNK_SIZE];
[_stringBuffer appendBytes:bytes length:readLength];
[self setTotalBytesRead:[self totalBytesRead] + readLength];
change it to:
uint8_t bytes[CHUNK_SIZE];
NSUInteger readLength = [_stream read:bytes maxLength:CHUNK_SIZE];
if (readLength > CHUNK_SIZE) {
readLength = CHUNK_SIZE;
}
[_stringBuffer appendBytes:bytes length:readLength];
[self setTotalBytesRead:[self totalBytesRead] + readLength];
After that changed I got only null values so I changed the file path (in the sample project it is located in the main(), however I did the parsing in viewDidLoad.
Make sure you copied the file in your bundle directory for that to work!
file = [NSBundle pathForResource:#"Test" ofType:#"scsv" inDirectory:[[NSBundle mainBundle] bundlePath]];
Edit:
When you say you need to download the file you can do following (but notice that this is quick and dirty solution especially on mobile devices)
NSData *downloadData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://www.yourdomain.tld/Test.scsv"]];
NSInputStream *stream = [NSInputStream inputStreamWithData:downloadData];
The last line is the important one here you need to change.
Hope that solves your issue.
Edit 2:
I've just created a repository with a demo project for you where the code actually works. Perhaps you can find out what you do wrong (or at least different). Here is the link.
Edit 3:
Change
self.csvParser = [[CHCSVParser alloc] initWithInputStream:stream usedEncoding:NSUTF8StringEncoding delimiter:#";"];
to
self.csvParser = [[CHCSVParser alloc] initWithInputStream:stream usedEncoding:&encoding delimiter:';'];
i have a NSData object.
I want to convert it to a string, pass to a function and then reconvert back to NSData object.
But How?
I tried this method, but NSData value it's different from the original!
here my code:
// a generic class
APClass *c = [[APClass alloc] init];
c.aNumber = 123;
c.aString = #"my string";
// my data obj
NSMutableData *data = [NSMutableData data];
// archiver to store class in nsdata
NSKeyedArchiver *encoder = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[encoder encodeObject:[NSNumber numberWithInt:c.aNumber] forKey:#"aNum"];
[encoder encodeObject:c.aString forKey:#"aStr"];
[encoder finishEncoding];
[encoder release];
[c release];
NSLog(#"%#", data);
NSString *d = [NSString stringWithFormat:#"%#", data];
// ---
NSString *strFromData = [NSString stringWithFormat:#"%#", d];
NSData *dataNM = [strFromData dataUsingEncoding:NSUTF8StringEncoding];
// decoder to retrieve class from nsdata
NSKeyedUnarchiver *decoder = [[NSKeyedUnarchiver alloc] initForReadingWithData:dataNM];
int number = [[decoder decodeObjectForKey:#"aNum"] intValue];
NSString *string = [decoder decodeObjectForKey:#"aStr"];
[decoder finishDecoding];
[decoder release];
NSLog(#"[Number: %d] -- [String: %#]", number, string);
How can i convert back to original NSData?
data and dataNM are different in size.
Compiler give back this error:
2012-04-02 16:33:28.269 DataTest[18008:f803] -[__NSCFData
objectForKey:]: unrecognized selector sent to instance 0x6b46c80
2012-04-02 16:33:28.270 DataTest[18008:f803] * Terminating app due
to uncaught exception 'NSInvalidArgumentException', reason:
'-[__NSCFData objectForKey:]: unrecognized selector sent to instance
0x6b46c80'
thanks.
Solved.
Using dataUsingEncoding, value of NSData it's different.
To pass data around methods or apps, etc, i've used base64 convertion.
Encode
NSString *d =
[NSString stringWithFormat:#"appdue://obj=%#",
[APBase64Converter base64forData:data]];
Decode
NSData *data = [APBase64Converter base64DataFromString:urlParams];
APBase64Converter Is a lib that encode/decode easily data and strings.
Working example and APBase64Converter lib can be downloaded from here: http://goo.gl/8YNjS
Thanks all.
I "retain" this post for helps people and me next time!
Use
NSData to NSString:
- (id)initWithData:(NSData *)data encoding:(NSStringEncoding)encoding
and
NSString to NSData:
- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding
with encoding
NSUTF8StringEncoding
or
NSMacOSRomanStringEncoding (which is an 8-bit encoding).
Use Base64 class it is available in github
DatabaseResult* result = [self.database executeQuery:#"SELECT * FROM `images` WHERE image_id = ? AND imagetype = ?", self.routeId,self.imagetype];
for(EGODatabaseRow* row in result) {
NSString *strImage=[row stringForColumn:#"image_photo"];
[Base64 initialize];
NSData *data = [Base64 decode:strImage];
UIImage *image=[UIImage imageWithData:data];
}
This is how i convert String to data and then data to image.
I'm working with facebook connect and trying to handle the JSON object that i'm receiving.
I invoked the requstWithGraphPath method and need to get back a JSON object,
tried to parse it and getting an error:
SBJSON *parser = [[SBJSON new] autorelease];
NSData *data = [[NSData alloc] initWithData:result];
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; -> in this line - "[__NSCFDictionary length]: unrecognized selector sent to instance"
NSArray *events = [parser objectWithString:jsonString];
What's the problem?
Can I get the string in an other way or parse the object differently?
Thanks.
If you are working with the delegate callback
- (void)request:(FBRequest *)request didLoad:(id)result;
the parsing work has been done for you. Traverse the NSDictionary or NSArray to find the data you are looking for. If you are working with the delegate callback
- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data;
you should initialize an NSString with the data, and use the category method that SBJSON adds to NSString for creating an id. That is assuming the data is data that constructs a string.
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
id result = [jsonString JSONValue];
Are you sure the error happens on that line, or does it happen on the line above?
If result is an NSDictionary (or CFDictionary, same thing), then it is already parsed and you do not need to do that yourself — and it could cause that error message too, on the line above.
The line:
data = [[NSData alloc] initWithData:result];
is almost certainly not what you want to do, as it is equivalent to
data = [result copy];
assuming that result is an NSData object (or NSMutableData), which I'm guessing it isn't.
What does mean? I get this error when trying to iterate through a file in Cocoa obj-c.
I can't find any information on the web.
Would appreciate some help. Thanks.
EDIT
I've been following this tutorial (link) to preload Core Data. I've tried creating a Cococa application and have also tried doing this from within my iPhone app. I think all my setup code for Core Data is fine. Whenever this method is called I get EXEC BAD ACCESS.
- (void)loadInitialData
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
// name ZSTREET_1 ZSTREET_2 ZCITY ZZIP ZURL ZTEL latitude longitude
NSString *path = [[NSBundle mainBundle] pathForResource:#"placesdata" ofType:#"txt"];
NSString *fileString = [NSString stringWithContentsOfFile:path]; // reads file into memory as an NSString
NSArray *lines = [fileString componentsSeparatedByString:#"\r"]; // each line, adjust character for line endings
NSManagedObjectContext *context = [self managedObjectContext];
for (NSString *line in lines)
{
NSLog(line);
NSString* string = [[NSString alloc] initWithUTF8String:line];
NSArray *parts = [string componentsSeparatedByString:#"\t"];
// value mapping
NSString *name = [parts objectAtIndex:0];
NSString *street_1 = [parts objectAtIndex:1];
NSString *street_2 = [parts objectAtIndex:2];
NSString *city = [parts objectAtIndex:3];
NSString *zip = [parts objectAtIndex:4];
NSString *url = [parts objectAtIndex:5];
NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterDecimalStyle];
NSNumber *latitude = [f numberFromString:[parts objectAtIndex:6]];
NSNumber *longitude = [f numberFromString:[parts objectAtIndex:7]];
[f release];
// splitting the parts to create the objects
Place *place = (Place *)[NSEntityDescription insertNewObjectForEntityForName:#"Place" inManagedObjectContext:context];
Address *address = (Address *)[NSEntityDescription insertNewObjectForEntityForName:#"Address" inManagedObjectContext:context];
Location *location = (Location *)[NSEntityDescription insertNewObjectForEntityForName:#"Location" inManagedObjectContext:context];
// set attributes
[place setValue:name forKey:#"name"];
[address setValue:street_1 forKey:#"street_1"];
[address setValue:street_2 forKey:#"street_2"];
[address setValue:city forKey:#"city"];
[address setValue:zip forKey:"#zip"];
[address setValue:url forKey:#"url"];
[location setValue:latitude forKey:#"latitude"];
[location setValue:longitude forKey:#"longitude"];
// link the objects together
[place setValue:address forKey:#"address"];
[place setValue:location forKeyPath:#"address.location"];
[string release];
}
NSLog(#"Done initial load");
NSError *error;
if (![context save:&error]) {
NSLog(#"Error saving: %#", error);
}
[context release];
[pool drain];
}
For other people running into this problem with entirely different code, this is a bit of a red herring.
The warning is from the debugger itself. The debugger creates a struct containing info for each object in the system. After the EXC_BAD_ACCESS, it tried to create one of these but was unable to. Note that this is a warning and not an error so it may even be expected in situations like this.
In any event, the details surrounding this don't matter. You've got to find the source of your EXC_BAD_ACCESS. A common cause is trying to access an object after it has been released.
For someone who comes across this in the future, I got this problem because I was doing this too much:
NSString* aString = #"";
for(int i=0; i<someLargeNumber; i++) {
aString = [aString stringByAppendingFormat:#"..."];
}
Once I switched to using NSMutableString, the problem was resolved.
This line is wrong and should produce a compiler warning:
NSString* string = [[NSString alloc] initWithUTF8String:line];
The method initWithUTF8String: expects an UTF-8 encoded C string and not a NSString object.
Before you continue you should fix all compiler warnings! And you also should check that the parts array actually contains as many objects as you expect. You also need to use a format string with NSLog, you might even crash there if your line contains any % characters.
I happen to run into EXC_BAD_ACCESS on a fairly regular basis (which is not a good thing), because we haven't enabled ARC yet.
I find the best way to track those errors down by using the Profiler in Zombie modus. This post shows you how to "hunt for zombies":
How do I set up NSZombieEnabled in Xcode 4?
I have some source code to get the file name of an url
for example:
http://www.google.com/a.pdf
I hope to get a.pdf
because the way to join 2 NSStrings I can get is 'appendString' which only for adding a string at right side, so I planned to check each char one by one from the right side of string 'http://www.google.com/a.pdf', when it reach at the char '/', stop the checking, return string fdp.a , after that I change fdp.a to a.pdf
source codes are below
-(NSMutableString *) getSubStringAfterH : originalString:(NSString *)s0
{
NSInteger i,l;
l=[s0 length];
NSMutableString *h=[[NSMutableString alloc] init];
NSMutableString *ttt=[[NSMutableString alloc] init ];
for(i=l-1;i>=0;i--) //check each char one by one from the right side of string 'http://www.google.com/a.pdf', when it reach at the char '/', stop
{
ttt=[s0 substringWithRange:NSMakeRange(i, 1)];
if([ttt isEqualToString:#"/"])
{
break;
}
else
{
[h appendString:ttt];
}
}
[ttt release];
NSMutableString *h1=[[[NSMutableString alloc] initWithFormat:#""] autorelease];
for (i=[h length]-1;i>=0;i--)
{
NSMutableString *t1=[[NSMutableString alloc] init ];
t1=[h substringWithRange:NSMakeRange(i, 1)];
[h1 appendString:t1];
[t1 release];
}
[h release];
return h1;
}
h1 can reuturn the coorect string a.pdf, but if it returns to the codes where it was called, after a while system reports
'double free
*** set a breakpoint in malloc_error_break to debug'
I checked a long time and foudn that if I removed the code
ttt=[s0 substringWithRange:NSMakeRange(i, 1)];
everything will be Ok (of course getSubStringAfterH can not returns the corrent result I expected.), no error reported.
I try to fix the bug a few hours, but still no clue.
Welcome any comment
Thanks
interdev
The following line does the job if url is a NSString:
NSString *filename = [url lastPathComponent];
If url is a NSURL, then the following does the job:
NSString *filename = [[url path] lastPathComponent];
Try this:
Edit: from blow comment
NSString *url = #"http://www.google.com/a.pdf";
NSArray *parts = [url componentsSeparatedByString:#"/"];
NSString *filename = [parts lastObject];
I think if you have already had the NSURL object, there is lastPathComponent method available from the iOS 4 onwards.
NSURL *url = [NSURL URLWithString:#"http://www.google.com/a.pdf"];
NSString *filename = [url lastPathComponent];
Swift 3
Let's say that your url is http://www.google.com/a.pdf
let filename = url.lastPathComponent
\\filename = "a.pdf"
This is more error free and meant for getting the localized name in the URL.
NSString *localizedName = nil;
[url getResourceValue:&localizedName forKey:NSURLLocalizedNameKey error:NULL];
I haven't tried this yet, but it seems like you might be trying to do this the hard way. The iPhone libraries have the NSURL class, and I imagine that you could simply do:
NSString *url = [NSURL URLWithString:#"http://www.google.com/a.pdf"];
NSString *path = [url path];
Definitely look for a built in function. The libraries have far more testing and will handle the edge cases better than anything you or I will write in an hour or two (generally speaking).