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Editorial Team
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Asked: 2026-05-25T01:31:11+00:00

I have a problem with the next code: NSDictionary * imagen = [[NSDictionary alloc]

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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…

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1 Answer

  1. Editorial Team

    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.

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