iOS中NSString轉換成HEX（十六進制）-NSData轉換成int

NSString?*str?=?@"0xff055008";??
//先以16為參數告訴strtoul字符串參數表示16進制數字，然后使用0x%X轉為數字類型??
unsigned?long?red?=?strtoul([str?UTF8String],0,16);??
//strtoul如果傳入的字符開頭是“0x”,那么第三個參數是0，也是會轉為十六進制的,這樣寫也可以：??
unsigned?long?red?=?strtoul([@"0x6587"?UTF8String],0,0);??
NSLog(@"轉換完的數字為：%lx",red);??

?

//?十六進制轉換為普通字符串的。???
+?(NSString?*)stringFromHexString:(NSString?*)hexString?{?//???
???
charchar?*myBuffer?=?(charchar?*)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;???
???
???
}???
???
//普通字符串轉換為十六進制的。???
???
+?(NSString?*)hexStringFromString:(NSString?*)string{???
NSData?*myD?=?[string?dataUsingEncoding:NSUTF8StringEncoding];???
Byte?*bytes?=?(Byte?*)[myD?bytes];???
//下面是Byte?轉換為16進制。???
NSString?*hexStr=@"";???
for(int?i=0;i<[myD?length];i++)???
???
{???
NSString?*newHexStr?=?[NSString?stringWithFormat:@"%x",bytes[i]&0xff];///16進制數???
???
if([newHexStr?length]==1)???
???
hexStr?=?[NSString?stringWithFormat:@"%@0%@",hexStr,newHexStr];???
???
else???
???
hexStr?=?[NSString?stringWithFormat:@"%@%@",hexStr,newHexStr];???
}???
return?hexStr;???
}???

//int?轉data??int?i?=?1;???NSData?*data?=?[NSData?dataWithBytes:?&i?length:?sizeof(i)];???//data?轉int??int?i;???[data?getBytes:?&i?length:?sizeof(i)];??
//int?轉data??
int?i?=?1;???
NSData?*data?=?[NSData?dataWithBytes:?&i?length:?sizeof(i)];???
//data?轉int??
int?i;???
[data?getBytes:?&i?length:?sizeof(i)];??