本人开发的都是和蓝牙有关在程序中 经常要用到异或运算
现在给大家罗列出来
1校验位异或 传入16进制串
-(NSData*)getcheckSum_BLE:(NSString*)byteStr
{
intlength = (int)byteStr.length/2;
NSData*data = [selfhexstrToBytes:byteStr];
Byte*bytes = (unsignedchar*)[databytes];
Bytesum =0;
for(inti =0;i
{
sum^=bytes[i];
}
NSString*str = [NSStringstringWithFormat:@"%@%@",byteStr,[selfToHex_BLE:sum]];
//NSLog(@"校验异或的结果%@",[str hexToBytes]);
//NSLog(@"进行校验运算");
return[self hexstrToBytes:str];
}
-(NSData*)hexstrToBytes:(NSString*)lenstr
{
NSMutableData* data = [NSMutableDatadata];
intidx;
for(idx =0; idx+2<= lenstr.length; idx+=2) {
NSRangerange =NSMakeRange(idx,2);
NSString* hexStr = [lenstrsubstringWithRange:range];
NSScanner* scanner = [NSScannerscannerWithString:hexStr];
unsignedintintValue;
[scannerscanHexInt:&intValue];
[dataappendBytes:&intValuelength:1];
}
returndata;
}
2 和0X5A异或
-(NSData*)yihuo0X5A:(NSMutableData*)dataresult
{
Byte*byte1 = (unsignedchar*)[dataresultbytes];
Bytesum =0x5A;
for(inti =0; i
{
byte1[i]^=sum;
}
NSData*data1 = [[NSDataalloc]initWithBytes:byte1length:dataresult.length];
NSString*string = [[NSStringalloc]initWithBytes:byte1length:dataresult.lengthencoding:NSUTF8StringEncoding];
returndata1;
}
因为在是蓝牙开发所以经常要对data进行拼接所以传入用可变的data
