解析保存到文本文件的字符串

发布于 2024-11-10 07:12:00 字数 264 浏览 3 评论 0原文

我将 Cocoa 应用程序中的数据保存到文本文件中。文本文件包含的信息如下所示：

foo1 -> foo2
blah -> lwjef
hi -> bye
hello -> goodbye

现在每行的第一部分由用户给出，但我需要获取每行在 -> 之后的部分。例如，如果用户输入foo1，我想在解析文本文件后输出foo2。有谁知道该怎么做？

原文

I save pieces of data from my Cocoa application into a text file. The text file contains information as shown:

foo1 -> foo2
blah -> lwjef
hi -> bye
hello -> goodbye

Now the first part of each row is given by the user, but I need to get the part of each row after the ->. For example, if the user enters foo1, I want to output foo2 after parsing the text file. Does anyone know how to do this?

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梦里兽 2024-11-17 07:12:00

解析一次：

NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
NSArray *lines = [string componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
for (NSString *line in lines) {
    NSArray *values = [line componentsSeparatedByString:@" -> "];
    if ([values count] != 2) {
        continue;
    }
    [dictionary setObject:[values objectAtIndex:1] forKey:[values objectAtIndex:0]];
}

然后查询密钥：

NSString *input = @"foo1";
NSString *answer = [dictionary objectForKey:input]; //@"foo2"

但是，如果数据最初来自您自己的应用程序，您可能应该这样做，而不是自定义（且不安全）的字符串格式：

//For saving:
[dictionary writeToFile:filePath atomically:YES];
//For loading:
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:filePath];

Parse once:

NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
NSArray *lines = [string componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
for (NSString *line in lines) {
    NSArray *values = [line componentsSeparatedByString:@" -> "];
    if ([values count] != 2) {
        continue;
    }
    [dictionary setObject:[values objectAtIndex:1] forKey:[values objectAtIndex:0]];
}

Then query for keys:

NSString *input = @"foo1";
NSString *answer = [dictionary objectForKey:input]; //@"foo2"

However, if the data originally came from your own application in the first place you should probably do this, instead of a custom (and insecure) string format:

//For saving:
[dictionary writeToFile:filePath atomically:YES];
//For loading:
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:filePath];

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