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