16进制数据拆分
转:8位16位32位数据的拆分与合并程序
https://blog.csdn.net/qq_31811537/article/details/71760334
拆分
//16位拆成两个8位
u16 data16 = 0x1234;
u8 data8_H,data8_L;
data8_H = (u8)(data16 >> 8);
data8_L = (u8)data16;
32位拆成4个8位
方法一:
u32 data32 = 0x12345678;
u8 data8_1,data8_2,data8_3,data8_4;
data8_1 = (u8)(data32 >> 24);
data8_2 = (u8)(data32 >> 16);
data8_3 = (u8)(data32 >> 8);
data8_4 = (u8)data32;
方法二:
u32 data32 = 0x12345678;
u8 data8_1,data8_2,data8_3,data8_4;
u8 *pa; //定义指针
pa = (u8 *)(&data32); //将32位地址,强制转换为8位地址
data8_1 = ((char )pa+3);
data8_2 = ((char )pa+2);
data8_3 = ((char )pa+1);
data8_4 = ((char )pa);
合并
2个8位合并成1个16位
u8 data8_H = 0x12;
u8 data8_L = 0x34;
u16 data16;
data16 = ((u16)data8_H << 8) | (u16)(data8_L));
4个8位合并成1个32位
u8 data8_1 = 0x12;
u8 data8_2 = 0x34;
u8 data8_3 = 0x56;
u8 data8_4 = 0x78;
u32 data32;
data32 = ((u32)data8_1 << 24) | ((u32)data8_2 << 16) | ((u32)data8_3 << 8) | ((u32)data8_4);
也可以%:取余
16进制的0x123456 % 0x100 结果等于 0x56, 这点与十进制是一样的。
商为0x1234,
再对0x1234%0x100,结果等于0x34,
商为0x12,
再对0x12%0x100,结果为0x12.
quint32 dataValue = 0x123456;
quint16 dataA = dataValue/0x100;
quint8 data1= dataValue % 0x100;
quint16 dataB = dataA/0x100;
quint8 data2 = dataA%0x100;
quint16 dataC = dataB/0x100;
quint8 data3 = dataB%0x100;