int 转16进制
NSString *hexString = [NSString stringWithFormat:@"%@",[[NSString alloc] initWithFormat:@"%1x",整形参数]];
16进制转int
unsigned long uint_ch = strtoul([str2 UTF8String], 0, 16);
//将十六进制的字符串转换成NSString则可使用如下式:
- (NSString *)convertHexStrToString:(NSString *)str
{
if (!str || [str length] == 0)
{
return nil;
}
NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8];NSRange range;if ([str length] % 2 == 0)
{
range = NSMakeRange(0,2);
} else {
range = NSMakeRange(0,1);
}for (NSInteger i = range.location; i < [str length]; i += 2)
{ unsigned int anInt;
NSString *hexCharStr = [str substringWithRange:range];
NSScanner *scanner = [[NSScanner alloc] initWithString:hexCharStr];
[scanner scanHexInt:&anInt];
NSData *entity = [[NSData alloc] initWithBytes:&anInt length:1];
[hexData appendData:entity];
range.location += range.length;
range.length = 2;
}
NSString *string = [[NSString alloc]initWithData:hexData encoding:NSUTF8StringEncoding];
return string;
}
`
//将NSString转换成十六进制的字符串则可使用如下方式:
- (NSString *)convertStringToHexStr:(NSString *)str {
if (!str || [str length] == 0)
{
return @"";
}
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];
[data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop)
{ unsigned char dataBytes = (unsigned char)bytes;
for (NSInteger i = 0; i < byteRange.length; i++)
{ NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
if ([hexStr length] == 2)
{ [string appendString:hexStr];
} else {
[string appendFormat:@"0%@", hexStr];
}
}
}];
return string;
}
