NSDictionary到文件

我一直在研究SOAP Web服務，它使用Caché來避免之前完成的HTTP請求。NSDictionary到文件

當我嘗試將NSDictionary保存到文件時，出現錯誤（我想這是因爲它沒有遵循屬性列表結構），我知道如何解決它。

這是我的代碼：

[self loadCache]; 
NSData *responseData; 
NSMutableDictionary* dict = [_cache objectForKey:delegate.type]; 

if (dict != nil && [dict objectForKey:request.HTTPBody] != nil) { 
    responseData = [dict objectForKey:request.HTTPBody]; 
} else { 
    NSHTTPURLResponse* urlResponse = nil; 
    NSError *error = [[NSError alloc] init]; 
    responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error]; 
    if (dict == nil) { 
     dict = [[NSMutableDictionary alloc] init]; 
     [_cache setObject:dict forKey:delegate.type]; 
     [dict setObject:[NSNumber numberWithDouble:NSTimeIntervalSince1970] forKey:@"FECHA"]; 
    } 
    if (responseData == nil) { 
     responseData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"xml"]]; 
    } 
    NSLog(@"%@", [[request.HTTPBody copy] class]); 
    [dict setObject:responseData forKey:request.HTTPBody]; 

    [self saveCache]; 
}

loadCache功能：

- (void)loadCache { 
if (_loadedCache) return; 
NSString* docsurl = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 
docsurl = [docsurl stringByAppendingPathComponent:@"cache.txt"]; 
_cache = [[NSMutableDictionary alloc] initWithContentsOfFile:docsurl]; 
if (_cache == nil) _cache = [[NSMutableDictionary alloc] init]; 
}

saveCache功能：

- (void)saveCache { 
NSString* docsurl = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 
docsurl = [docsurl stringByAppendingPathComponent:@"cache.txt"]; 
if ([_cache writeToFile:docsurl atomically:YES]) { 
    NSLog(@"SAVED"); 
} else { 
    NSLog(@"ERROR"); 
} 
}

來源

2012-05-26 Vicenç Gascó

解決！我試圖使用NSData作爲KEY，並且它只能用作VALUE。 –