序列化/反序列化编码器/解码器不工作

Question

这是我第一次尝试序列化数据，我一定做得不对，因为它不起作用。也许是因为我试图序列化的类是一个委托，或者是因为我填充数据的方式，或者可能还有无数其他错误。知道如何做到这一点的人能看看我的代码并给我一些提示吗？请

头文件：

#import <Foundation/Foundation.h>
@protocol IDTemplateDelegate <NSObject>
- (void)saveTemplateForUI;
@end
@interface IDTemplate : NSObject <NSCoding>
@property (nonatomic) const char *templateData;
@property (nonatomic) NSUInteger templateSize;
@property (nonatomic) int templateQuality;
@property (nonatomic) int templateLocation;
@property (nonatomic, assign) id<IDTemplateDelegate> delegate;
@end

实现文件：

#import "IDTemplate.h"
@implementation IDTemplate
@synthesize delegate;
- (id)initWithCoder:(NSCoder *)decoder
{
    self = [super init];
    if (self) {
        NSData *data = [decoder decodeObjectForKey:@"templateData"];
        [data getBytes:(void *)_templateData length:_templateSize];
        _templateSize = [decoder decodeIntegerForKey:@"templateSize"];
        _templateQuality = [decoder decodeIntForKey:@"templateQuality"];
        _templateLocation = [decoder decodeIntForKey:@"templateLocation"];
    }
    return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
    NSData *data = [NSData dataWithBytes:_templateData length:_templateSize];
    [encoder encodeObject:data forKey:@"templateData"];
    [encoder encodeInteger:_templateSize forKey:@"templateSize"];
    [encoder encodeInt:_templateQuality forKey:@"templateQuality"];
    [encoder encodeInt:_templateLocation forKey:@"templateLocation"];    
}
- (void)populateTemplate:(IDTemplate *)template
{
    self.templateData = template.templateData;
    self.templateSize = template.templateSize;
    self.templateQuality = template.templateQuality;
    self.templateLocation = template.templateLocation;
}
@end

调用代码在这里：

self.template是指向应该是我的序列化类的指针。也许我不能这样做？

- (void)generateTemplate:(cv::Mat)src
{
    Template template = *([self.cpp generateTemplate:src]);
    // self.template is a pointer to what should be my serialized class
    // maybe I can't do it this way?
    self.template = [[IDTemplate alloc] init]; 
    self.template.delegate = self;
    [self.template setTemplateData:template.getData()];
    [self.template setTemplateSize:template.getSize()];
    [self.template setTemplateQuality:template.getQuality()];
    [self.template setTemplateLocation:template.getLocation()];
    {// Setting up NSNotification for templateData
        NSMutableDictionary *templateData = [NSMutableDictionary dictionaryWithCapacity:1];
        [templateData setObject:self.template forKey:@"Template"];
        NSNotificationCenter *templateNote = [NSNotificationCenter defaultCenter];
        [templateNote postNotificationName:@"TemplateGenerated" object:nil userInfo:templateData];
    }
}

Answer 1

我注意到，在您的init方法中，在解码之前，您使用的是_templateSize。