ios十進位制、十六進位制字串，byte，data等之間的轉換
十進位制->十六進位制
Byte bytes[]={0xA6,0x27,0x0A};
NSString *strIdL = [NSStringstringWithFormat:@"%@",[[NSStringalloc]initWithFormat:@"%02lx",(long)bytes[0]]];
十六進位制->十進位制
NSString *rechargeInfo
= @"0xff055008";
NSString *cardId2 = [rechargeInfosubstringWithRange:NSMakeRange(2,2)];
cardId2 = [NSString
NSString
*str = @"0xff055008";
//先以16為引數告訴strtoul字串引數表示16進位制數字，然後使用0x%X轉為數字型別
unsignedlongred
= strtoul([str UTF8String],0,16);
//strtoul如果傳入的字元開頭是“0x”,那麼第三個引數是0，也是會轉為十六進位制的,這樣寫也可以：
unsignedlongred
= strtoul([@"0x6587"UTF8String],0,0);
NSLog(@"轉換完的數字為：%lx",red);
#pragma mark --字串處理方法
//字串處理方法
+(NSString *)cutString:(NSString *)str{
NSString *targetStr=nil;
if (str.length>9) {
targetStr=[str substringFromIndex:9];
}
return targetStr;
}
+(NSString *)transToStr:(NSData *)data{
NSString *str=[NSStringstringWithFormat
return str;
}
//字串補零操作
+(NSString *)addZero:(NSString *)str withLength:(int)length{
NSString *string = nil;
if (str.length==length) {
return str;
}
if (str.length<length) {
NSUInteger inter = length-str.length;
for (int i=0;i< inter; i++) {
string = [NSString stringWithFormat:@"0%@",str];
str = string;
}
}
return string;
}
+(NSString *)stringFromHexString:(NSString *)hexString {//
char *myBuffer = (char *)malloc((int)[hexStringlength] / 2 +1);
bzero(myBuffer, [hexString length] / 2 + 1);
for (int i =0; i < [hexString length] - 1; i += 2) {
unsigned int anInt;
NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)];
NSScanner * scanner = [[NSScanneralloc] initWithString:hexCharStr] ;
[scanner scanHexInt:&anInt];
myBuffer[i / 2] = (char)anInt;
NSLog(@"myBuffer is %c",myBuffer[i /2] );
}
NSString *unicodeString = [NSStringstringWithCString:myBuffer encoding:4];
NSLog(@"———字串=======%@",unicodeString);
return unicodeString;
}
//10進位制轉16進位制
+(NSString *)ToHex:(longlong int)tmpid
{
NSString *nLetterValue;
NSString *str =@"";
long longint ttmpig;
for (int i =0; i<9; i++) {
ttmpig=tmpid%16;
tmpid=tmpid/16;
switch (ttmpig)
{
case 10:
nLetterValue =@"A";break;
case 11:
nLetterValue =@"B";break;
case 12:
nLetterValue =@"C";break;
case 13:
nLetterValue =@"D";break;
case 14:
nLetterValue =@"E";break;
case 15:
nLetterValue =@"F";break;
default:nLetterValue=[[NSStringalloc]initWithFormat:@"%lli",ttmpig];
}
str = [nLetterValue stringByAppendingString:str];
if (tmpid == 0) {
break;
}
}
return str;
}
//將16進位制的字串轉換成NSData
+ (NSMutableData *)convertHexStrToData:(NSString *)str {
if (!str || [str length] == 0) {
return nil;
}
NSMutableData *hexData = [[NSMutableDataalloc] initWithCapacity:8];
NSRange range;
if ([str length] %2 == 0) {
range = NSMakeRange(0,2);
} else {
range = NSMakeRange(0,1);
}
for (NSInteger i = range.location; i < [strlength]; i += 2) {
unsigned int anInt;
NSString *hexCharStr = [str substringWithRange:range];
NSScanner *scanner = [[NSScanneralloc] initWithString:hexCharStr];
[scanner scanHexInt:&anInt];
NSData *entity = [[NSDataalloc] initWithBytes:&anIntlength:1];
[hexData appendData:entity];
range.location += range.length;
range.length = 2;
}
return hexData;
}
+ (NSString *)convertDataToHexStr:(NSData *)data {
if (!data || [data length] == 0) {
return @"";
}
NSMutableString *string = [[NSMutableStringalloc] initWithCapacity:[datalength]];
[data enumerateByteRangesUsingBlock:^(constvoid *bytes, NSRange byteRange,BOOL *stop) {
unsigned char *dataBytes = (unsignedchar*)bytes;
for (NSInteger i =0; i < byteRange.length; i++) {
NSString *hexStr = [NSStringstringWithFormat:@"%x", (dataBytes[i]) &0xff];
if ([hexStr length] == 2) {
[string appendString:hexStr];
} else {
[string appendFormat:@"0%@", hexStr];
}
}
}];
return string;
}
//十進位制準換為十六進位制字串
+ (NSString *)hexStringFromString:(NSString *)string{
NSData *myD = [stringdataUsingEncoding:NSUTF8StringEncoding];
Byte *bytes = (Byte *)[myDbytes];
//下面是Byte轉換為16進位制。
NSString *hexStr=@"";
for(int i=0;i<[myDlength];i++)
{
NSString *newHexStr = [NSStringstringWithFormat:@"%x",bytes[i]&0xff];///16進位制數
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
return hexStr;
}
+(NSString *) parseByteArray2HexString:(Byte[]) bytes
{
NSMutableString *hexStr = [[NSMutableStringalloc]init];
int i = 0;
if(bytes)
{
while (bytes[i] != '\0')
{
NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16進位制數
if([hexByte length]==1)
[hexStr appendFormat:@"0%@", hexByte];
else
[hexStr appendFormat:@"%@", hexByte];
i++;
}
}
NSLog(@"bytes 的16進位制數為:%@",hexStr);
return hexStr;
}