Question

我有一个文本文件（songlist.txt），我的应用程序从服务器检索并在本地存储。当我尝试在我的应用程序中使用该文件的内容时，我得到了意想不到的结果。当我调查这个问题时，我发现奇怪的字符有时会出现在文本文件的NSString内容的末尾。

为什么这些奇怪的角色在这里？（以下是我的来源）：

字符串END处的STRANGE CHARACTERS示例：

1）我
2）upp†
3）mul†
4）ID

//文本文件的精确内容（songlist.txt）

Song One.mp3
Song Two.mp3
宋三.mp3
Song Four.mp3
Song Five.mp3

//Downloading Songlist from the internet, Saving it to Documents folder
-(void)downloadSongList
{
    NSString *songlistString;

    NSString *URLString_list = @"http://et.bicdoss.com/app/songlist.txt";
    NSURL *URL_list = [NSURL URLWithString:[URLString_list stringByAddingPercentEscapesUsingEncoding:                           NSASCIIStringEncoding]];

    // Get Data of Contents (for Write to Disk)
    NSData *songData = [NSData dataWithContentsOfURL:URL_list];

    if(songData == nil) {

        NSLog(@"SONGLIST.TXT NOT DOWNLOADED");

    }else{

    // Write Songlist.txt to disk
    NSString *filePath = [[self documentsDirectory] stringByAppendingPathComponent:@"Music/songlist.txt"];
    [songData writeToFile:filePath atomically:YES];
       NSLog(@"SONGLIST.TXT DOWNLOADED");
    }

}

// Retrieve songlist.txt from local documents folder
-(NSString*)getLocalSongList
{
NSData *textFileData = [NSData dataWithContentsOfFile:[[self documentsDirectory] stringByAppendingPathComponent:@"Music/songlist.txt"]];
NSString *textFileString = [NSString stringWithUTF8String:[textFileData bytes]];

return textFileString;          
}

//Create NSMutableArray of contents of songlist.txt (seperated by linebreaks)

...
NSMutableArray *files_catalog;
    files_catalog = [[NSMutableArray alloc] init];
    [files_catalog addObjectsFromArray:[[self getLocalSongList] componentsSeparatedByString: @"\n"]];
    [files_catalog retain];

    for(int a = 0; a<[files_catalog count]; a++){
        NSLog(@"Contents of Object %i (files_catalog) %@", a, [files_catalog objectAtIndex:a]);
/*

NOTE:
The above NSLog statement always gives strange output (note strange characters at the end of last filename:)

(output)
2010-02-02 21:22:27.145 SomeApp[19670:207] >>>>>>>>>>>>>>>>>>>> Cntnts of Objct 0 (files_catalog) Song One.mp3
2010-02-02 21:22:27.145 SomeApp[19670:207] >>>>>>>>>>>>>>>>>>>> Cntnts of Objct 1 (files_catalog) Song Two.mp3
2010-02-02 21:22:27.146 SomeApp[19670:207] >>>>>>>>>>>>>>>>>>>> Cntnts of Objct 2 (files_catalog) Song Three.mp3
2010-02-02 21:22:27.146 SomeApp[19670:207] >>>>>>>>>>>>>>>>>>>> Cntnts of Objct 3 (files_catalog) Song Four.mp3
2010-02-02 21:22:27.146 SomeApp[19670:207] >>>>>>>>>>>>>>>>>>>> Cntnts of Objct 4 (files_catalog) Song Five.mp3upp†


Some other examples of strange characters at the end were:

I
upp†
mul†
ID

*/
}

...

Answer 1

导入时，编码似乎搞砸了。尝试使用stringWithContentsOfFile：encoding：error：method。

[NSString stringWithContentsOfFile:[[self documentsDirectory] stringByAppendingPathComponent:@"Music/songlist.txt"] encoding:NSUTF8StringEncoding error:nil];

另外，它会跳过NSData步骤。

在我的NSString结束时，这些奇怪的'流氓角色'是什么？

1 个答案: