从 NSString 创建安全文件名？

发布于 2024-11-28 22:34:30 字数 458 浏览 1 评论 0原文

有没有办法获取 NSString 并将其转换为安全版本，可以用作文件名保存到 iPhone 上的用户文档目录中。

我目前正在做这样的事情：

NSString *inputString = @"This is sample text which may have funny chars and spaces in.";

NSInteger len = [inputString length];        
NSString *newFilename = [[inputString substringToIndex:MIN(20, len)] stringByAppendingPathExtension:@"txt"];

这目前给我留下了类似的东西：

This is sample text .txt

需要确保文件名中不允许的字符也被删除。

原文

Is there way to take a NSString and turn it into a safe version that can be used as a filename to save to the user Documents directory on the iPhone.

I'm currently doing something like this:

NSString *inputString = @"This is sample text which may have funny chars and spaces in.";

NSInteger len = [inputString length];        
NSString *newFilename = [[inputString substringToIndex:MIN(20, len)] stringByAppendingPathExtension:@"txt"];

This currently leaves me with something like:

This is sample text .txt

Need to make sure characters that are not allowed in filenames and stripped out too.

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じ违心 2024-12-05 22:34:31

你可能最终会得到一些正则表达式或其他东西。仅仅是因为使用 except 过滤器太危险了（您可能会错过一些非法字符）。

因此，我建议您使用 RegexKitLite (http://regexkit.sourceforge.net/RegexKitLite/)，并结合以下代码行：

inputString = [inputString stringByReplacingOccurencesOfRegex:@"([^A-Za-z0-9]*)" withString:@""];

这将替换除 AZ、az 和 0-9 =) 之外的所有字符！

You'll probably end up with some regex or something. Simply because it's too dangerous to use a except-filter (you may miss some illegal chars).

Therefor I'ld recommend you to use RegexKitLite (http://regexkit.sourceforge.net/RegexKitLite/), combined with the following line of code:

inputString = [inputString stringByReplacingOccurencesOfRegex:@"([^A-Za-z0-9]*)" withString:@""];

This will replace all characters except A-Z, a-z and 0-9 =)!

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心如荒岛 2024-12-05 22:34:31

您也可以用老式的方式来代替使用正则表达式：

NSString* SanitizeFilename(NSString* filename)
{
    NSMutableString* stripped = [NSMutableString stringWithCapacity:filename.length];
    for (int t = 0; t < filename.length; ++t)
    {
        unichar c = [filename characterAtIndex:t];

        // Only allow a-z, A-Z, 0-9, space, -
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') 
        ||  (c >= '0' && c <= '9') || c == ' ' || c == '-')
            [stripped appendFormat:@"%c", c];
        else
            [stripped appendString:@"_"];
    }

    // No empty spaces at the beginning or end of the path name (also no dots
    // at the end); that messes up the Windows file system.
    return [stripped stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

You can also do it the old fashioned way instead of using a regex:

NSString* SanitizeFilename(NSString* filename)
{
    NSMutableString* stripped = [NSMutableString stringWithCapacity:filename.length];
    for (int t = 0; t < filename.length; ++t)
    {
        unichar c = [filename characterAtIndex:t];

        // Only allow a-z, A-Z, 0-9, space, -
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') 
        ||  (c >= '0' && c <= '9') || c == ' ' || c == '-')
            [stripped appendFormat:@"%c", c];
        else
            [stripped appendString:@"_"];
    }

    // No empty spaces at the beginning or end of the path name (also no dots
    // at the end); that messes up the Windows file system.
    return [stripped stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

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