读取文档文件夹中的文本文件——Iphone SDK

I have this code below:

我有以下代码:

    NSString *fileName = [[NSUserDefaults standardUserDefaults] objectForKey:@"recentDownload"];
    NSString *fullPath = [NSBundle pathForResource:fileName ofType:@"txt" inDirectory:[NSHomeDirectory() stringByAppendingString:@"/Documents/"]];
    NSError *error = nil;

    [textViewerDownload setText:[NSString stringWithContentsOfFile:fullPath encoding: NSUTF8StringEncoding error:&error]];

textviewerdownload is the textview displaying the text from the file. The actual file name is stored in an NSUserDefault called recentDownload.

textviewerdownload是显示文件文本的textview。实际的文件名存储在名为recentDownload的NSUserDefault中。
When I build this, I click the button which this is under, and my application crashes.

当我构建它时，我点击它下面的按钮，我的应用程序崩溃了。
Is there anything wrong with the syntax or just simple error?

语法有问题吗?还是只是简单的错误?

3 个解决方案

#1

The NSBundle class is used for finding things within your applications bundle, but the Documents directory is outside the bundle, so the way you're generating the path won't work. Try this instead:

NSBundle类用于在应用程序包中查找内容，但是Documents目录不在这个包中，因此生成路径的方式将不起作用。试试这个:

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

NSString *fullPath = [[paths lastObject] stringByAppendingPathComponent:@"recentDownload.txt"];

#2

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *myPathDocs =  [documentsDirectory stringByAppendingPathComponent:@"myfile.txt"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:myPathDocs])
    {
        NSString *myPathInfo = [[NSBundle mainBundle] pathForResource:@"myfile" ofType:@"txt"];
        NSFileManager *fileManager = [NSFileManager defaultManager];
        [fileManager copyItemAtPath:myPathInfo toPath:myPathDocs error:NULL];
    }       

    //Load from File
NSString *myString = [[NSString alloc] initWithContentsOfFile:myPathDocs encoding:NSUTF8StringEncoding error:NULL];

This worked for me

这为我工作

Anyway, thank you all..

不管怎样,谢谢大家. .

#3

For read/write from text file check this url.

要从文本文件中读写，请检查此url。

#1