MFC-获取最高字节或最低字节

 

    int i = 19680104;
    /*在一般的电脑中，int占用4字节，32比特，数据范围为 - 2147483648~2147483647[-2 ^ 31~2 ^ 31 - 1]
    19680104=0001 00101100   01001011 01101000

    */
    WORD il = LOWORD(i);    //获取低16bit
    /*WORD就是unsigned short
    在32位平台下如windows(32位)中short一般为16位
    il=19304=01001011 01101000   

    */

    WORD ih = HIWORD(i);    //获取最后32bit数的高16bit
    /*
    ih=300=0001 00101100
    */

    unsigned bh = HIBYTE(ih);//获取最后16bit数的高8bit
    /*
    bh=1=0001
    */

    unsigned bl= LOBYTE(ih);//获取低8bit
    /*
    bl=44=00101100
    */

    long int ii = 223372036854771234;
    /*
    long int 64位
    ii = 223372036854771234=0011 00011001 10010011 10101111       00011101 01111011 11101110 00100010
    */

    unsigned lll = HIWORD(ii);
    //lll=7547=0001110101111011