2011-07-21 19 views
1

当用户第一次使用我的应用程序时,它应该将配置文件从软件包复制到某个文件夹中。然后用户可以摆弄这个文件,如果他们搞砸了,他们可以简单地按'恢复',这将删除该文件并再次从该文件夹中复制。iOS:在应用程序启动时从软件包复制文件

- (void) resetPresets 
{ 
    LOG_(@"Copying tunings file from original..."); 

    // copy default tunings -> curr tunings file 

    NSString* appSupportDir = [NSFileManager appSupportDir]; 
    NSString* tuningsPath = [appSupportDir stringByAppendingPathComponent: @"tunings.txt"]; 

    NSBundle* bundle = [NSBundle mainBundle]; 
    NSString* origTuningsPath = [bundle pathForResource: @"tuningsOriginal" 
               ofType: @"txt" ]; 


    NSFileManager* fileManager = [NSFileManager defaultManager]; 
    NSError* error = nil; 

    if([fileManager fileExistsAtPath: tuningsPath]) 
    { 
     [fileManager removeItemAtPath: tuningsPath 
           error: & error ]; 
     if(error) 
      LOG(@"\n ERROR: %@ \n %@ \n", [error userInfo], [error localizedFailureReason]); 
    } 


    assert([fileManager fileExistsAtPath: origTuningsPath]); 

    [fileManager copyItemAtPath: origTuningsPath 
         toPath: tuningsPath 
          error: & error ]; 

    if(error) 
     LOG(@"\n ERROR: %@ \n %@ \n", [error userInfo], [error localizedFailureReason]); 


    LOG(@"done!"); 


    // load profiles from it 
    [self loadProfilesFromFile: tuningsPath ]; 

    // auto-sets active preset index to 0 & saves prefs 
    self.activeThemeIndex = 0; 
} 

依赖于一个简单分类:

#import "NSFileManager+addons.h" 


@implementation NSFileManager (NSFileManager_addons) 

+ (NSString *) appSupportDir 
{ 

    NSArray* paths = NSSearchPathForDirectoriesInDomains(
                 NSApplicationSupportDirectory, 
                 NSUserDomainMask, 
                 YES 
                 ); 

    NSString* appSupportDir = [paths objectAtIndex: 0]; 

    return appSupportDir; 
} 

@end 

这是导致问题的行:

[fileManager copyItemAtPath: origTuningsPath 
         toPath: tuningsPath 
          error: & error ]; 

,这是控制台输出:

[presets init] Presets -> first run! Setting up with default presets Copying tunings file from original... ERROR: { NSDestinationFilePath = "/var/mobile/Applications/38FC3C65-74AF-4892-B48D-A3508A8CF404/Library/Application Support/tunings.txt"; NSFilePath = "/var/mobile/Applications/38FC3C65-74AF-4892-B48D-A3508A8CF404/Fork.app/tuningsOriginal.txt"; NSUserStringVariant = Copy; } No such file or directory

为什么它抱怨没有苏ch文件或目录?显然,不应该有这样的文件存在。当你将一个文件复制到一个新的位置时,你不希望有一个文件在那里。

所以我想它是抱怨目录。但我使用相当标准的方法将目录捞出。到底是怎么回事?这不是正确的目录吗?还是我在做其他事情?

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