Question

我在下面有这个NSString。我希望能够获取每个应用程序的名称及其位置。有人可以帮助我或指出我正确的方向吗？提前谢谢。

Applications:

Xcode:

  Version: 4.5.2
  Last Modified: 11/3/12 11:45 PM
  Kind: Intel
  64-Bit (Intel): Yes
  App Store: Yes
  Location: /Applications/Xcode.app

Terminal:

  Version: 2.3
  Last Modified: 6/21/12 12:01 AM
  Kind: Intel
  64-Bit (Intel): Yes
  App Store: No
  Location: /Applications/Utilities/Terminal.app

Google Chrome:

  Version: 23.0.1271.64
  Last Modified: 10/31/12 7:59 PM
  Kind: Intel
  64-Bit (Intel): No
  App Store: No
  Location: /Applications/Google Chrome.app

App Store:

  Version: 1.2.1
  Last Modified: 4/18/12 7:52 PM
  Kind: Intel
  64-Bit (Intel): Yes
  App Store: No
  Location: /Applications/App Store.app

Answer 1

使用您的字符串创建NSScanner的实例。由于NSScanner的实例默认默认跳过空格和换行符，因此您需要在继续操作之前禁用此行为，如下所示：

[scanner setCharactersToBeSkipped:[[[NSCharacterSet alloc] init] autorelease]];

从这里开始，你会做这样的事情：

NSString *appName = nil;

[scanner scanString:@"Applications:" intoString:NULL];

NSCharacterSet *charset = [NSCharacterSet newlineCharacterSet];

[scanner scanCharactersFromSet:charset intoString:NULL];

while ([scanner isAtEnd] == NO)
{
    // Get your application name.
    [scanner scanUpToCharactersFromSet:charset intoString:&appName];
    [scanner scanCharactersFromSet:charset intoString:NULL];

    // You could do something with your application name here.

    // Skip over the other stuff.
    for (NSUInteger idx = 0; idx < 6; idx++)
    {
        [scanner scanUpToString:@":" intoString:NULL];
        [scanner scanString:@":" intoString:NULL];
        [scanner scanUpToCharactersFromSet:charset intoString:NULL];
        [scanner scanCharactersFromSet:charset intoString:NULL];
    }
}

请注意，尽管有外表，但我没有给你一个完整的解决方案。除了检查字符串的结尾之外，没有错误检查，并且不用说Real Applications检查错误。（甚至应该在一开始就检查字符串结尾。）此外，此代码段依赖于数据的严格表示，例如您提供的。

Answer 2

如果有简单的分隔符，我会使用componentsSeparatedByString。如果没有，请尝试使用带有NSRegularExpression的正则表达式来查找值

Answer 3

有很多方法可以解决这个问题。已提及NSRegularExpression。 NSScanner是另一个。这是一个潜在的解决方案（不保证正确性 - 只是一个指南。）

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSString *source = @"Applications:\n\nXcode:\n\n  Version: 4.5.\n  Last Modified: 11/3/12 11:45 PM\n  Kind: Intel\n  64-Bit (Intel): Yes\n App Store: Yes\n  Location: /Applications/Xcode.app";
        NSScanner *scanner = [NSScanner scannerWithString:source];
        [scanner scanUpToString:@":" intoString:NULL];
        [scanner scanString:@":" intoString:NULL];

        while( ![scanner isAtEnd] ) {
            NSString *appName = nil;
            NSString *appPath = nil;

            [scanner scanUpToCharactersFromSet:[NSCharacterSet alphanumericCharacterSet] intoString:NULL];
            [scanner scanCharactersFromSet:[NSCharacterSet alphanumericCharacterSet] intoString:&appName];

            NSString *junk = nil;
            [scanner scanUpToString:@"Location: " intoString:&junk];
            [scanner scanString:@"Location: " intoString:NULL];
            [scanner scanUpToString:@"\n" intoString:&appPath];
            [scanner scanString:@"\n" intoString:NULL];

            printf("app name = %s, path = %s\n",[appName UTF8String],[appPath UTF8String]);
        }

    }
    return 0;
}

在NSString中获取特定值

3 个答案: