从一个url中取得文本信息(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。
-(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,
};