数据转换
//
// DataTransfrom.h
//
//
// Created by Wayne on 2019/4/8.
// Copyright © 2019 Wayne. All rights reserved.
//
#import
@interfaceDataTransfrom :NSObject
+ (float)getFloatValue:(NSString*)hexString ;
+ (float)getFloatHighToLow:(NSString*)hexString;
+ (float)getJumpFloat:(NSString*)hexString ;
+ (int)getIntValue:(NSString*)hexString ;
+ (NSString*)getHexString:(float)data ;
+ (NSString*)getHexStringfromInt:(int)data ;
+ (NSData*)getData:(NSString*)hexString andSplit:(NSString*)splitSign ;
@end
//
// DataTransfrom.m
//
//
// Created by Wayne on 2019/4/8.
// Copyright © 2019 Wayne. All rights reserved.
//
#import "DataTransfrom.h"
@implementation DataTransfrom
+ (float)getFloatValue:(NSString*)hexString
{
floatvalue = 0;
NSScanner *scanner = [NSScanner scannerWithString:hexString] ;
unsigned long long longValue ;
[scanner scanHexLongLong: &longValue] ;
long decimal = (long)pow(2,23) ;
long long threshold = (long)powl(2,31) ;
long high = (long)(longValue/decimal) -127;
long low = longValue%decimal ;
long singlevalue = low + decimal ;
long clacvalue = singlevalue*powl(2, high) ;
value = (float)(clacvalue)/decimal ;
if (longValue >= threshold) {
value *= -1;
}
returnvalue ;
}
+ (float)getJumpFloat:(NSString*)hexString
{
float value = 0;
NSString*strOne = [hexString substringWithRange:NSMakeRange(0,2)] ;
NSString *strTwo = [hexString substringWithRange:NSMakeRange(2,2)] ;
NSString *strThree = [hexString substringWithRange:NSMakeRange(4,2)] ;
NSString *strFour = [hexString substringWithRange:NSMakeRange(6,2)] ;
NSScanner *scanner = [NSScanner scannerWithString: [NSStringstringWithFormat:@"%@%@%@%@",strFour,strThree,strTwo,strOne]] ;
unsigned long long longValue ;
[scanner scanHexLongLong:&longValue] ;
long decimal = (long)pow(2,23) ;
long longthreshold = (long)powl(2,31) ;
long high = (long)(longValue/decimal) -127;
long low = longValue%decimal ;
long singlevalue = low + decimal ;
long clacvalue = singlevalue*powl(2, high) ;
value = (float)(clacvalue)/decimal ;
if (longValue >= threshold) {
value *= -1;
}
returnvalue ;
}
+ (float)getFloatHighToLow:(NSString*)hexString
{
float value = 0;
NSString *strOne = [hexString substringWithRange:NSMakeRange(0,2)] ;
NSString *strTwo = [hexString substringWithRange:NSMakeRange(2,2)] ;
NSString *strThree = [hexString substringWithRange:NSMakeRange(4,2)] ;
NSString *strFour = [hexString substringWithRange:NSMakeRange(6,2)] ;
NSScanner *scanner = [NSScanner scannerWithString:[NSStringstringWithFormat:@"%@%@%@%@",strFour,strThree,strTwo,strOne]] ;
unsigned long long longValue ;
[scanner scanHexLongLong: &longValue] ;
long decimal = (long)pow(2,23) ;
long longthreshold = (long)powl(2,31) ;
long high = (long)(longValue/decimal) -127;
long low = longValue%decimal ;
long singlevalue = low + decimal ;
long clacvalue = singlevalue*powl(2, high) ;
value = (float)(clacvalue)/decimal ;
if(longValue >= threshold) {
value *= -1;
}
returnvalue ;
}
+ (NSString*)getHexString:(float)data
{
NSString *hexString =@"";
long decimal = powl(2,23) ;
long longthreshoid = powl(2,31) ;
BOOL isNegative = data >0?NO:YES;
if (isNegative) {
data *= -1;
}
float ratio =1;
while (data <1|| data >=2) {
if(data <1) {
data *=2;
ratio /=2;
}
if(data >=2) {
data = data/2;
ratio *=2;
}
}
long lowdata = (data -1)*decimal ;
intpowTimes =0;
while (ratio !=1) {
if (ratio >1) {
ratio /=2;
powTimes +=1;
}else{
ratio *=2;
powTimes -=1;
}
}
long highdata = powTimes +127;
long longtotaldata = highdata * decimal + lowdata ;
if(isNegative) {
totaldata += threshoid ;
}
for (inti =0;i <8;i++) {
intdata = totaldata%16;
totaldata /=16;
switch(data) {
case10:
hexString = [NSString stringWithFormat:@"A%@",hexString] ;
break;
case11:
hexString = [NSStringstringWithFormat:@"B%@",hexString] ;
break;
case12:
hexString = [NSString stringWithFormat:@"C%@",hexString] ;
break;
case13:
hexString = [NSString stringWithFormat:@"D%@",hexString] ;
break;
case14:
hexString = [NSString stringWithFormat:@"E%@",hexString] ;
break;
case15:
hexString = [NSString stringWithFormat:@"F%@",hexString] ;
break;
default:
hexString = [NSString stringWithFormat:@"%i%@",data,hexString] ;
break;
}
}
while(hexString.length<2) {
hexString = [NSStringstringWithFormat:@"0%@",hexString] ;
}
returnhexString ;
}
+ (NSString*)getHexStringfromInt:(int)data
{
inttotaldata = data ;
NSString*hexString =@"";
while (totaldata >0)
{
intsingle = totaldata%16;
totaldata /=16;
switch(single) {
case10:
hexString = [NSString stringWithFormat:@"A%@",hexString] ;
break;
case11:
hexString = [NSString stringWithFormat:@"B%@",hexString] ;
break;
case12:
hexString = [NSStringstringWithFormat:@"C%@",hexString] ;
break;
case13:
hexString = [NSString stringWithFormat:@"D%@",hexString] ;
break;
case14:
hexString = [NSStringstringWithFormat:@"E%@",hexString] ;
break;
case15:
hexString = [NSString stringWithFormat:@"F%@",hexString] ;
break;
default:
hexString = [NSString stringWithFormat:@"%i%@",single,hexString] ;
break;
}
}
while(hexString.length<2) {
hexString = [NSString stringWithFormat:@"0%@",hexString] ;
}
return hexString ;
}
+ (int)getIntValue:(NSString*)hexString
{
int value =0;
NSScanner *scanner = [NSScanner scannerWithString:hexString] ;
unsigned long long longValue ;
[scanner scanHexLongLong: &longValue] ;
value = (int)longValue ;
return value ;
}
+ (NSData*)getData:(NSString*)hexString andSplit:(NSString*)splitSign
{
NSMutableData *multidata = [[NSMutableData alloc] init] ;
NSArray *array = [hexString componentsSeparatedByString: splitSign] ;
for(NSString*datainarray) {
intidata = [self getIntValue: data] ;
[multidata appendBytes:&idata length:1] ;
}
returnmultidata ;
}
@end
