引用計數遞減不正確

Question

我收到filemanager對象引用計數的錯誤遞減。

-(void) checkDb{ 
BOOL success; 
// Create a FileManager object, we will use this to check the status of the database and to copy it over if required 
NSFileManager *fileManager = [NSFileManager defaultManager]; 

// Check if the database has already been created in the users filesystem 
success = [fileManager fileExistsAtPath:dbPath]; 

if (success) 
{ 
    //we found the file, we need to check version 
    sqlite3 *db; 
    //NSLog(@"Current Databasepath: %@",dbPath); 
    // Open the current db (found in the user's filessytem) 
    if(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK) { 
     const char *sql = "select dbversion from settings"; 
     sqlite3_stmt *rs; 
     if(sqlite3_prepare_v2(db, sql, -1, &rs, NULL) == SQLITE_OK) { 
      if (sqlite3_step(rs) == SQLITE_ROW) { 
       //not eof 
       int curDbVersion=sqlite3_column_int(rs,0); 
       if (curDbVersion>=minDbVersion){ 
        //good dbversion, no need to copy from resources 
        return; 
       } 
      } 
     } 
     sqlite3_finalize(rs); 
    } 
    sqlite3_close(db); 
} 

//we reached this section which means: 
//either database was not found, or invalid db version 
//so, we need to copy it from the resources directory (or maybe download it from internet?) 

// Get the path to the database in the application package 
NSString *dbPathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:dbName]; 

// Copy the database from the package to the users filesystem 
[fileManager copyItemAtPath:dbPathFromApp toPath:dbPath error:nil]; 

[fileManager release]; 

}

的程序運行完美，但是當我分析一下，我得到一個警告。

這裏的警告的截圖是我得到：

的東西可能我錯過任何提示？

Answer 1

記下您建立文件管理器的指針行：

NSFileManager *fileManager = [NSFileManager defaultManager]; 

的話copy，new，alloc，或retain都無處可尋：你沒有自己的文件管理器，因此，你應該不釋放它。

你的最後一行：

[fileManager release]; 

有效地試圖釋放defaultFileManager，你當然沒有自己。

Answer 2

不要release文件管理器 - 它是一個局部變量，將在稍後自動發佈。