首页 > 代码库 > iOS中NSString转换成HEX（十六进制）-NSData转换成int

iOS中NSString转换成HEX（十六进制）-NSData转换成int

2024-07-09 07:05:14   225人阅读

http://www.2cto.com/kf/201402/281501.html

 

1
2
3
4
5
6
NSString *str = @"0xff055008";
//先以16为参数告诉strtoul字符串参数表示16进制数字，然后使用0x%X转为数字类型
unsigned long red = strtoul([str UTF8String],0,16);
//strtoul如果传入的字符开头是“0x”,那么第三个参数是0，也是会转为十六进制的,这样写也可以：
unsigned long red = strtoul([@"0x6587" UTF8String],0,0);
NSLog(@"转换完的数字为：%lx",red);

 

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
// 十六进制转换为普通字符串的。
+ (NSString *)stringFromHexString:(NSString *)hexString { //
  
char *myBuffer = (char *)malloc((int)[hexString length] / 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 = [[[NSScanner alloc] initWithString:hexCharStr] autorelease];
[scanner scanHexInt:&anInt];
myBuffer[i / 2] = (char)anInt;
}
NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4];
NSLog(@"------字符串=======%@",unicodeString);
return unicodeString;
  
  
}
  
//普通字符串转换为十六进制的。
  
+ (NSString *)hexStringFromString:(NSString *)string{
NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];
Byte *bytes = (Byte *)[myD bytes];
//下面是Byte 转换为16进制。
NSString *hexStr=@"";
for(int i=0;i<[myD length];i++)
  
{
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数
  
if([newHexStr length]==1)
  
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
  
else
  
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
return hexStr;
}

 

 

1
2
3
4
5
6
//int 转data
int i = 1;
NSData *data = http://www.mamicode.com/[NSData dataWithBytes: &i length: sizeof(i)];
//data 转int
int i;
[data getBytes: &i length: sizeof(i)];


联系
我们