从一个url中获得文本信息

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有时候你可能需要从一个url中获取一个文本文件中的信息。 下面的例子会从我的博客页面下载大量的html信息。

1. -(void) readFromURL{
           NSError *error;
           NSURL *url = [NSURL URLWithString:@"https://blog.prosight.me/"];
           NSString *content = [NSString stringWithContentsOfURL: url
                        encoding:NSUTF8StringEncoding
                        error:&error];
   }

    主要是应用NSString的类方法：

   + (id)stringWithContentsOfURL:(NSURL *)url encoding:(NSStringEncoding)enc error:(NSError **)error

    encoding可以为以下这些中的一种

2. enum {
      NSASCIIStringEncoding = 1,
      NSNEXTSTEPStringEncoding = 2,
      NSJapaneseEUCStringEncoding = 3,
      NSUTF8StringEncoding = 4,
      NSISOLatin1StringEncoding = 5,
      NSSymbolStringEncoding = 6,
      NSNonLossyASCIIStringEncoding = 7,
      NSShiftJISStringEncoding = 8,
      NSISOLatin2StringEncoding = 9,
      NSUnicodeStringEncoding = 10,
      NSWindowsCP1251StringEncoding = 11,
      NSWindowsCP1252StringEncoding = 12,
      NSWindowsCP1253StringEncoding = 13,
      NSWindowsCP1254StringEncoding = 14,
      NSWindowsCP1250StringEncoding = 15,
      NSISO2022JPStringEncoding = 21,
      NSMacOSRomanStringEncoding = 30,
      NSUTF16StringEncoding = NSUnicodeStringEncoding,
      NSUTF16BigEndianStringEncoding = 0×90000100,
      NSUTF16LittleEndianStringEncoding = 0×94000100,
      NSUTF32StringEncoding = 0×8c000100,
      NSUTF32BigEndianStringEncoding = 0×98000100,
      NSUTF32LittleEndianStringEncoding = 0×9c000100,
   };

    
4.