将应用程序包中的文件复制到用户的应用程序支持文件夹

Question

我正在制作应用程序，需要将应用程序包中的某个文件复制到用户的应用程序支持文件夹。这是我实际使用的代码：

NSBundle *thisBundle = [NSBundle mainBundle]; 
NSString *executableName = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleExecutable"]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES); 
NSString *userpath = [paths objectAtIndex:0]; 
userpath = [userpath stringByAppendingPathComponent:executableName]; // The file will go in this directory 
NSString *saveFilePath = [userpath stringByAppendingPathComponent:@"db.sqlite"]; 
NSFileManager *fileManager = [[NSFileManager alloc] init]; 
[fileManager copyItemAtPath:[thisBundle pathForResource:@"db" ofType:@"sqlite"] toPath:saveFilePath error:NULL]; 

但是这不会复制任何东西，BTW这是一个Mac应用程序。

Answer 1

终于它与添加

if ([fileManager fileExistsAtPath:userpath] == NO) 
    [fileManager createDirectoryAtPath:userpath withIntermediateDirectories:YES attributes:nil error:nil]; 

工作而产生的代码是：

NSBundle *thisBundle = [NSBundle mainBundle]; 

NSString *executableName = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleExecutable"]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES); 
NSString *userpath = [paths objectAtIndex:0]; 
userpath = [userpath stringByAppendingPathComponent:executableName]; // The file will go in this directory 
NSString *saveFilePath = [userpath stringByAppendingPathComponent:@"db.sqlite"]; 
NSFileManager *fileManager = [[NSFileManager alloc] init]; 
if ([fileManager fileExistsAtPath:userpath] == NO) 
    [fileManager createDirectoryAtPath:userpath withIntermediateDirectories:YES attributes:nil error:nil]; 

[fileManager copyItemAtPath:[thisBundle pathForResource:@"db" ofType:@"sqlite"] toPath:saveFilePath error:NULL]; 

Answer 2

您可能要仔细检查你的文件路径：

NSLog(@"src: %@", [thisBundle pathForResource:@"db" ofType:@"sqlite"]); 
NSLog(@"dst: %@", saveFilePath);