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iOS 2进制与16进制的转换

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@implementation NSString (StringToHexData)

//
// Decodes an NSString containing hex encoded bytes into an NSData object

  • (NSData *) stringToHexData
    {
    int len = [self length] / 2; // Target length
    unsigned char *buf = malloc(len)
    unsigned char *whole_byte = buf;
    char byte_chars[3] = {'\0','\0','\0'};

    int i;
    for (i=0; i < [self length] / 2; i++) {
    byte_chars[0] = [self characterAtIndex:i2];
    byte_chars[1] = [self characterAtIndex:i
    2+1];
    *whole_byte = strtol(byte_chars, NULL, 16);
    whole_byte++;
    }

    NSData *data = [NSData dataWithBytes:buf length:len];
    free( buf );
    return data;
    }

@end
@implementation NSData (DataToHexString)

  • (NSString *) dataToHexString
    {
    NSUInteger len = [self length];
    char * chars = (char *)[self bytes];
    NSMutableString * hexString = [[NSMutableString alloc] init];

for(NSUInteger i = 0; i < len; i++ )
[hexString appendString:[NSString stringWithFormat:@"%0.2hhx", >chars[i]]];

return hexString;
}
@end

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