1。如何读取UTF-8编码的文本文件?
2。如何读取GB2312(中文)的文本文件?
3。如何读取其它编码文件?
首先解决第一个问题,1。如何读取UTF-8编码的文本文件?
NSString *filePath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:fileName]; [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil] //当然也可以采用如下方法 //NSData *data = [NSData dataWithContentsOfFile:filePath]; //NSString *textFile = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
2。如何读取GB2312(中文)的文本文件?
可能很多人会想到,那还不简单,apple肯定提供了gb2312的文件编码常量,让我们看看有那些常量吧,看看 NSUTF8StringEncoding定义文件,应该会有GB2312的常量定义。
/* Note that in addition to the values explicitly listed below, NSStringEncoding supports encodings provided by CFString.
See CFStringEncodingExt.h for a list of these encodings.
See CFString.h for functions which convert between NSStringEncoding and CFStringEncoding.
*/
enum {
NSASCIIStringEncoding = 1,/* 0..127 only */
NSNEXTSTEPStringEncoding = 2,
NSJapaneseEUCStringEncoding = 3,
NSUTF8StringEncoding = 4,
NSISOLatin1StringEncoding = 5,
NSSymbolStringEncoding = 6,
NSNonLossyASCIIStringEncoding = 7,
NSShiftJISStringEncoding = 8, /* kCFStringEncodingDOSJapanese */
NSISOLatin2StringEncoding = 9,
NSUnicodeStringEncoding = 10,
NSWindowsCP1251StringEncoding = 11, /* Cyrillic; same as AdobeStandardCyrillic */
NSWindowsCP1252StringEncoding = 12, /* WinLatin1 */
NSWindowsCP1253StringEncoding = 13, /* Greek */
NSWindowsCP1254StringEncoding = 14, /* Turkish */
NSWindowsCP1250StringEncoding = 15, /* WinLatin2 */
NSISO2022JPStringEncoding = 21, /* ISO 2022 Japanese encoding for e-mail */
NSMacOSRomanStringEncoding = 30,
NSUTF16StringEncoding = NSUnicodeStringEncoding, /* An alias for NSUnicodeStringEncoding */
NSUTF16BigEndianStringEncoding = 0x90000100, /* NSUTF16StringEncoding encoding with explicit endianness specified */
NSUTF16LittleEndianStringEncoding = 0x94000100, /* NSUTF16StringEncoding encoding with explicit endianness specified */
NSUTF32StringEncoding = 0x8c000100,
NSUTF32BigEndianStringEncoding = 0x98000100, /* NSUTF32StringEncoding encoding with explicit endianness specified */
NSUTF32LittleEndianStringEncoding = 0x9c000100 /* NSUTF32StringEncoding encoding with explicit endianness specified */
};
typedef NSUInteger NSStringEncoding;
很遗憾,我没找到,不过Apple留了个线索让我取找,不过仔细看看它的注释
Note that in addition to the values explicitly listed below, NSStringEncoding supports encodings provided by CFString.
See CFStringEncodingExt.h for a list of these encodings.
See CFString.h for functions which convert between NSStringEncoding and CFStringEncoding.
我的英文比较不好,但大意是看明白了,不在下面支持了编码格式,在CFStringEncodingExt.h 里头文件申明 。
我们通过finder的文件查找方法找到CFStringEncodingExt.h 。
仔细看看确实找到了kCFStringEncodingGB_18030_2000 ( 我以为是kCFStringEncodingGB_2312_80 ,实际上不是) 但是这个是CFStringEncoding类型,我们需要NSEncode的类型。
CFString 和NSString具有相同的内存结构,也是NSString的重要补充,通过查找CFString的帮助文档,找到了这个方法 CFStringConvertEncodingToNSStringEncoding
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000); NSString *textFile = [NSString stringWithContentsOfFile:filePath encoding:enc error:nil];
那么第二个问题就解决了
3。如何读取其它编码文件?
相信,通过以上的方法,第三个问题也可以很顺利的解决了。
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