读取文档文件夹中的文本文件 - Iphone SDK

发布于 2024-08-30 08:50:22 字数 710 浏览 3 评论 0原文

我的代码如下：

    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 是显示文件中文本的 textview。实际文件名存储在名为 recentDownload 的 NSUserDefault 中。
当我构建这个时，我单击了它下面的按钮，我的应用程序崩溃了。
语法有什么问题还是只是简单的错误？

原文

I have this code below:

    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.
When I build this, I click the button which this is under, and my application crashes.
Is there anything wrong with the syntax or just simple error?

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飞烟轻若梦 2024-09-06 08:50:22

NSBundle 类用于在应用程序包中查找内容，但 Documents 目录位于包之外，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"];

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:

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

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

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你的背包 2024-09-06 08:50:22

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];

无论如何，这对我有用

，谢谢大家..

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

Anyway, thank you all..

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