一、整形装换成两个字节
intvalue =456;
unsignedcharbyte1 = (value &0xff00)>>8;//高8位
unsignedcharbyte2 = (value &0xff);//低8位
NSLog(@"byte1= %x byte2= %x ",byte1,byte2);
byte1 = 1; byte2= c8;
二、两个字节转换成十进制整数
charbytes[]={byte1,byte2};
unsignedcharby1 = (bytes[0] &0xff);//高8位
unsignedcharby2 = (bytes[1] &0xff);//低8位
inttemp = (by2|(by1<<8));
NSLog(@"temp = %d",temp);
temp = 456;
三、整形装换成三个字节
intvalue =134456;
unsignedcharbyte1 = (value &0xff0000)>>16;//最高8位
unsignedcharbyte2 = (value &0xff00)>>8;//中间8位
unsignedcharbyte3 = (value &0xff);//低8位
NSLog(@"byte1= %x byte2= %x byte3= %x ",byte1,byte2,byte3);
byte1= 2 byte2= d byte3= 38
四、三个字节转换成十进制整数
charbytes[]={byte1,byte2,byte3};
unsignedcharby1 = (bytes[0] &0xff);//高8位
unsignedcharby2 = (bytes[1] &0xff);//中8位
unsignedcharby3 = (bytes[2] &0xff);//低8位
inttemp = (by3|(by2<<8)|(by1<<16));
NSLog(@"temp = %d",temp);
temp = 134456
转：http://blog.csdn.net/qq_26705543/article/details/51065225
