Object-c Hex 操作

#import <Foundation/Foundation.h>@interface NSString (FROAD_NSString_Additionss)- (Byte * ) getBytes;+ (NSString * ) stringFromBytes:(Byte *) byte bytesLen:(int)len;@end@implementation NSString (FROAD_NSString_Additionss)- (Byte * ) getBytes  {NSData * data = [self dataUsingEncoding: NSUTF16BigEndianStringEncoding];Byte * v_bytes = (Byte*)[data bytes];return v_bytes;//NSMutableArray * array = [[[NSMutableArray alloc] init] autorelease];////for (int i = 0 ;i < [data length] ; i++)//{//[array addObject:[NSNumber numberWithChar:v_bytes[i]]];//}//return [data length];}+ (NSString * ) stringFromBytes:(Byte *) byte bytesLen:(int)len{NSData * data = [[NSData alloc] initWithBytes:byte length:len];NSString * s = [[[NSString alloc] initWithData:data encoding:NSUTF16BigEndianStringEncoding] autorelease];return s ;}@end@interface Hex : NSObject{}@end@implementation Hex+ (Byte ) numFromChar : (char ) c{if ( c >='0' && c <= '9'){return c - '0';}else if (c >='A' && c <='Z') {return c - 'A' + 10;}else if (c >='a' && c <= 'z') {return c - 'a' + 10;}return -1;}+ (NSData * ) dataFromHexString : (NSString *) s_t{// 4F60 597D//0100 1111s_t = [s_t stringByReplacingOccurrencesOfString:@" "  withString: @""];if ([s_t length]%2 !=0){return nil;}Byte * retBytes = malloc(sizeof(char) * [s_t length]);Byte * ori = retBytes;for ( int i = 0 ; i < [s_t length]; ){char highBit = [s_t characterAtIndex:i ++];char lowBit = [s_t characterAtIndex:i ++];//to byte Byte a = [Hex numFromChar:highBit];Byte b = [Hex numFromChar:lowBit];*(retBytes ++)= (a<<4) | b;}NSData * data = [NSData dataWithBytes:ori length:[s_t length]/2];return data;}+ (NSString * ) stringFromByte:(Byte ) byteVal;{NSMutableString *str = [NSMutableString string];Byte byte1 = byteVal >> 4;Byte byte2 = byteVal & 0xf;[str appendFormat:@"%x" , byte1];[str appendFormat:@"%x" , byte2];return str;}//0000 0000 0000 0000+ (NSString *) stringFromShort :(short) shortVal{NSMutableString *str = [NSMutableString string];[str appendFormat:@"%x" , shortVal >> 12];[str appendFormat:@"%x" , (shortVal >> 8 ) & 0xf ];[str appendFormat:@"%x" , (shortVal >> 4 ) & 0xf];[str appendFormat:@"%x" , shortVal &0xf];return str;}+ (NSString * ) hexStringfromData:(NSData * )data{NSMutableString * str = [NSMutableString string];Byte * byte = (Byte *)[data bytes];for ( int i = 0 ;i < [data length] ;i ++){[str appendString:[Hex stringFromByte: *(byte + i)] ];}return str;}@endint main (int argc, const char * argv[]) {NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];//  String to utf bytes .//NSString * ori = @"注册成功123";////NSData * s_data = [ori dataUsingEncoding:NSUTF16BigEndianStringEncoding];////NSLog(@"%@" , s_data);//////utf bytes to  string .////NSString * s = [[NSString alloc] initWithData:s_data// encoding:NSUTF16BigEndianStringEncoding];//NSLog(@"%@" , s);// hexNSString * s = [Hex stringFromShort:(short)0x123A ];NSLog(@"%@" , s);NSString * v_s = @"4F60 597D";NSData  * data = [Hex dataFromHexString:v_s];NSLog(@"%@" , data);NSLog(@"%@" , [Hex hexStringfromData:data]);    [pool drain];    return 0;}