【iOS】如何判断文本文件的字符编码格式

来源：互联网发布：linux 3.14.79下载编辑：程序博客网时间：2024/04/29 06:13
总体思路：
遍历所有的字符编码，能正确读取输出转换的就是文本文件的编码格式。
代码如下：
[objc] view plaincopy
//  
//  main.m  
//  检测文本字符编码格式的小技巧  
//  
//  Created by 杜子兮 (duzixi) on 14-6-21.  
//  Copyright (c) 2014年 lanou3g.com All rights reserved.  
//  
  
#import <Foundation/Foundation.h>  
  
int main(int argc, const charchar * argv[])  
{  
  
    @autoreleasepool {  
          
        NSArray *arrEncoding = @[@(NSASCIIStringEncoding),  
                                 @(NSNEXTSTEPStringEncoding),  
                                 @(NSJapaneseEUCStringEncoding),  
                                 @(NSUTF8StringEncoding),  
                                 @(NSISOLatin1StringEncoding),  
                                 @(NSSymbolStringEncoding),  
                                 @(NSNonLossyASCIIStringEncoding),  
                                 @(NSShiftJISStringEncoding),  
                                 @(NSISOLatin2StringEncoding),  
                                 @(NSUnicodeStringEncoding),  
                                 @(NSWindowsCP1251StringEncoding),  
                                 @(NSWindowsCP1252StringEncoding),  
                                 @(NSWindowsCP1253StringEncoding),  
                                 @(NSWindowsCP1254StringEncoding),  
                                 @(NSWindowsCP1250StringEncoding),  
                                 @(NSISO2022JPStringEncoding),  
                                 @(NSMacOSRomanStringEncoding),  
                                 @(NSUTF16StringEncoding),  
                                 @(NSUTF16BigEndianStringEncoding),  
                                 @(NSUTF16LittleEndianStringEncoding),  
                                 @(NSUTF32StringEncoding),  
                                 @(NSUTF32BigEndianStringEncoding),  
                                 @(NSUTF32LittleEndianStringEncoding)  
                                 ];  
          
        NSArray *arrEncodingName = @[@"NSASCIIStringEncoding",  
                                     @"NSNEXTSTEPStringEncoding",  
                                     @"NSJapaneseEUCStringEncoding",  
                                     @"NSUTF8StringEncoding",  
                                     @"NSISOLatin1StringEncoding",  
                                     @"NSSymbolStringEncoding",  
                                     @"NSNonLossyASCIIStringEncoding",  
                                     @"NSShiftJISStringEncoding",  
                                     @"NSISOLatin2StringEncoding",  
                                     @"NSUnicodeStringEncoding",  
                                     @"NSWindowsCP1251StringEncoding",  
                                     @"NSWindowsCP1252StringEncoding",  
                                     @"NSWindowsCP1253StringEncoding",  
                                     @"NSWindowsCP1254StringEncoding",  
                                     @"NSWindowsCP1250StringEncoding",  
                                     @"NSISO2022JPStringEncoding",  
                                     @"NSMacOSRomanStringEncoding",  
                                     @"NSUTF16StringEncoding",  
                                     @"NSUTF16BigEndianStringEncoding",  
                                     @"NSUTF16LittleEndianStringEncoding",  
                                     @"NSUTF32StringEncoding",  
                                     @"NSUTF32BigEndianStringEncoding",  
                                     @"NSUTF32LittleEndianStringEncoding"  
                                    ];  
          
        for (int i = 0 ; i < [arrEncoding count]; i++) {  
            unsigned long encodingCode = [arrEncoding[i] unsignedLongValue];  
            NSLog(@"(%@)", arrEncodingName[i]);  
            NSError *error = nil;  
            NSString *filePath = @"/Users/dlios1/Desktop/event.xml"; // <---这里是要查看的文件路径  
            NSString *aString = [NSString stringWithContentsOfFile:filePath encoding:encodingCode  error:&error];  
            NSLog(@"Error:%@", [error localizedDescription]);  
            NSData *data = [aString dataUsingEncoding:encodingCode];  
            NSString *string = [[NSString alloc] initWithData:data encoding:encodingCode];  
            NSLog(@"%@", string);  
              
            /* 
            // 如果有必要，还可以把文件创建出来再测试 
            [string writeToFile:[NSString stringWithFormat:@"/Users/dlios1/Desktop/%@.xml", arrEncodingName[i]] 
                     atomically:YES 
                       encoding:encodingCode 
                          error:&error]; 
             */  
        }  
    }  
    return 0;  
}  
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