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);??

?

[objc] view plaincopy

//?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;???

}???

[objc] view plaincopy

//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)];??

轉載于:https://www.cnblogs.com/Free-Thinker/p/9155380.html

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