IOS檔案操作

1.從cache檔案夾拷貝到document檔案夾[cpp]  NSString *sqlFile = @"test.zip";   NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);   NSString *cacheDir = [cachePath objectAtIndex:0];   NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];   NSLog(databasePath);      NSFileManager *fileManager = [NSFileManager defaultManager];   // Copy the database sql file from the resourcepath to the documentpath   if ([fileManager fileExistsAtPath:databasePath])   {       //NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];       NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);       NSString *documentpath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;       NSString* databasePathFromApp = [documentpath stringByAppendingString:@"/test.zip"] ;       NSLog(databasePathFromApp);       NSError *error;       [fileManager copyItemAtPath:databasePath toPath:databasePathFromApp error:&error];       //        if (error != nil) {       //            NSLog(@"[Database:Error] %@", error);       //        }   }    2.從document檔案夾拷貝到cache檔案夾[cpp] NSString *sqlFile = @"qxd.db";        NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);        NSString *cacheDir = [cachePath objectAtIndex:0];        NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];                        NSFileManager *fileManager = [NSFileManager defaultManager];        // Copy the database sql file from the resourcepath to the documentpath        if (![fileManager fileExistsAtPath:databasePath]) {            NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];            NSError *error;            [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:&error];    //        if (error != nil) {    //            NSLog(@"[Database:Error] %@", error);    //        }        }