从一个url中获得文本信息(转)

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.