今天看见一个很棒的博客，只是无法粉丝之，就转载一下几篇很好用的博文吧
转载至：http://hi.baidu.com/may2150209/blog/item/198976ace7e583054b36d6f1.html
PS:发现博主也是转载的，anyway，好用就行
以下为正文
今天在尝试抓取起点中文网首页的时候遇到了一个问题 — 如果编码没有用对的话是没办
法读取任何东西的.
这也算是C#用的太多养成的坏习惯, 以前基本没怎么考虑过编码问题. 应该说, C#里面就算编码错了, 也能读进来东西,
只是一片乱码而已. Cocoa里面就狠了点, 直接抛异常了.
下面是刚开始写的一段代码, 把起点中文网的主页下载到一个字符串中.
NSURL *url = [[NSURL alloc]
initWithString:@"http://www.cmfu.com"];
NSError *error;
NSString *xml = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
if(xml == nil)
{ NSLog(@"Error reading url at %@", [error localizedFailureReason]); }
else { [result setString:xml]; }
死活下载失败, 错误信息就是编码不对. 好吧, 我打开了帮助查看了下所有的编码:
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 =
0x90000100,
NSUTF16LittleEndianStringEncoding =
0x94000100,
NSUTF32StringEncoding =
0x8c000100,
NSUTF32BigEndianStringEncoding =
0x98000100,
NSUTF32LittleEndianStringEncoding =
0x9c000100,
};
我一个一个的试,
居然全都不行! 崩溃了, 这都什么年代了, 难道Cocoa还不支持中文? 不可能啊.
估计是上面那份文档里面只是列出了最长用的几种编码(这里是苹果认为最长用的, 可见对于中国基本是无视了, 鄙视下!),
我就写了下面这段代码输出了所有支持的编码:
const NSStringEncoding *encodings = [NSString availableStringEncodings];
NSMutableString *str = [[NSMutableString alloc] init];
NSStringEncoding encoding;
while ((encoding = *encodings++) != 0)
{
[str appendFormat: @"%@ === %in", [NSString localizedNameOfStringEncoding：encoding], encoding]; }
[result setString: str];
好家伙, 果然被我猜中了, 下面就是所有支持的编码列表
Western (Mac OS Roman) === 30
Japanese (Mac OS) === -2147483647
Traditional Chinese (Mac OS) === -2147483646
Korean (Mac OS) === -2147483645
Arabic (Mac OS) === -2147483644
Hebrew (Mac OS) === -2147483643
Greek (Mac OS) === -2147483642
Cyrillic (Mac OS) === -2147483641
Devanagari (Mac OS) === -2147483639
Gurmukhi (Mac OS) === -2147483638
Gujarati (Mac OS) === -2147483637
Thai (Mac OS) === -2147483627
Simplified Chinese (Mac OS) === -2147483623
Tibetan (Mac OS) === -2147483622
Central European (Mac OS) === -2147483619
Symbol (Mac OS) === 6
Dingbats (Mac OS) === -2147483614
Turkish (Mac OS) === -2147483613
Croatian (Mac OS) === -2147483612
Icelandic (Mac OS) === -2147483611
Romanian (Mac OS) === -2147483610
Celtic (Mac OS) === -2147483609
Gaelic (Mac OS) === -2147483608
Keyboard Symbols (Mac OS) === -2147483607
Farsi (Mac OS) === -2147483508
Cyrillic (Mac OS Ukrainian) === -2147483496
Inuit (Mac OS) === -2147483412
Unicode (UTF-32LE) === -1677721344
Unicode (UTF-8) === 4
Unicode (UTF-16) === 10
Unicode (UTF-16BE) === -1879047936
Unicode (UTF-16LE) === -1811939072
Unicode (UTF-32) === -1946156800
Unicode (UTF-32BE) === -1744830208
Western (ISO Latin 1) === 5
Central European (ISO Latin 2) === 9
Western (ISO Latin 3) === -2147483133
Central European (ISO Latin 4) === -2147483132
Cyrillic (ISO 8859-5) === -2147483131
Arabic (ISO 8859-6) === -2147483130
Greek (ISO 8859-7) === -2147483129
Hebrew (ISO 8859-8) === -2147483128
Turkish (ISO Latin 5) === -2147483127
Nordic (ISO Latin 6) === -2147483126
Thai (ISO 8859-11) === -2147483125
Baltic Rim (ISO Latin 7) === -2147483123
Celtic (ISO Latin ===
-2147483122
Western (ISO Latin 9) === -2147483121
Romanian (ISO Latin 10) === -2147483120
Latin-US (DOS) === -2147482624
Greek (DOS) === -2147482619
Baltic Rim (DOS) === -2147482618
Western (DOS Latin 1) === -2147482608
Greek (DOS Greek 1) === -2147482607
Central European (DOS Latin 2) === -2147482606
Cyrillic (DOS) === -2147482605
Turkish (DOS) === -2147482604
Portuguese (DOS) === -2147482603
Icelandic (DOS) === -2147482602
Hebrew (DOS) === -2147482601
Canadian French (DOS) === -2147482600
Arabic (DOS) === -2147482599
Nordic (DOS) === -2147482598
Cyrillic (DOS) === -2147482597
Greek (DOS Greek 2) === -2147482596
Thai (Windows, DOS) === -2147482595
Japanese (Windows, DOS) === 8
Simplified Chinese (Windows, DOS) === -2147482591
Korean (Windows, DOS) === -2147482590
Traditional Chinese (Windows, DOS) === -2147482589
Western (Windows Latin 1) === 12
Central European (Windows Latin 2) === 15
Cyrillic (Windows) === 11
Greek (Windows) === 13
Turkish (Windows Latin 5) === 14
Hebrew (Windows) === -2147482363
Arabic (Windows) === -2147482362
Baltic Rim (Windows) === -2147482361
Vietnamese (Windows) === -2147482360
Western (ASCII) === 1
Japanese (Shift JIS X0213) === -2147482072
Chinese (GBK) === -2147482063
Chinese (GB 18030) === -2147482062
Japanese (ISO 2022-JP) === 21
Korean (ISO 2022-KR) === -2147481536
Japanese (EUC) === 3
Simplified Chinese (EUC) === -2147481296
Traditional Chinese (EUC) === -2147481295
Korean (EUC) === -2147481280
Japanese (Shift JIS) === -2147481087
Cyrillic (KOI8-R) === -2147481086
Traditional Chinese (Big 5) === -2147481085
Western (Mac Mail) === -2147481084
Simplified Chinese (HZ GB 2312) === -2147481083
Traditional Chinese (Big 5 HKSCS) === -2147481082
Ukrainian (KOI8-U) === -2147481080
Traditional Chinese (Big 5-E) === -2147481079
Western (NextStep) === 2
Non-lossy ASCII === 7
Western (EBCDIC Latin 1) === -2147480574
终于看到了熟悉的 GBK 编码, 对应的代码是 -2147482063. Ok, 更改一下最开始的代码
NSURL *url = [[NSURL alloc] initWithString:@"http://www.cmfu.com"];
NSError *error;
NSStringEncoding encoder;
NSString *xml = [NSString stringWithContentsOfURL:url encoding:encoder=-2147482063 error:&error];
if(xml == nil)
{ NSLog(@"Error reading url at %@", [error localizedFailureReason]); }
else { [result setString:xml]; }
终于搞定了! 看到熟悉的中文真是激动了.
注：转载的