4字節(jié),根據(jù)符號(hào)性先將2字節(jié)的數(shù)據(jù)轉(zhuǎn)換成對(duì)應(yīng)的4字節(jié) ..."/>
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void Test()
{
//原則
//字節(jié)相同,只作二進(jìn)制拷貝
//2字節(jié)->4字節(jié),根據(jù)符號(hào)性先將2字節(jié)的數(shù)據(jù)轉(zhuǎn)換成對(duì)應(yīng)的4字節(jié)
//4字節(jié)->2字節(jié),直接拷貝低位
int i = 0;
{
//INT16 -> UINT16
//UINT16 -> UINT16
}
{
//INT32 -> UINT32
INT32 n1 = 0xffffffff;
UINT32 u1 = n1;//0xffffffff
++i;
}
{
//UINT32 -> INT32
UINT32 u1 = 0xffffffff;
INT32 n1 = u1;//0xffffffff
++i;
}
{
//INT16 -> INT32
INT16 n1 = 0xffff;
INT32 n2 = n1; //0xffffffff, 2字節(jié)擴(kuò)展到4字節(jié),符號(hào)保持不變
++i;
}
{
//INT16 -> UINT32
INT16 n1 = 0xffff;
UINT32 u1 = n1; //0xffffffff, INT16->INT32->UINT32
u1 = (UINT32)(n1&0x0000ffff); //0xffff
n1 = 0x1;
u1 = n1;//0x1
++i;
}
{
//UINT16 -> UINT32
UINT16 u1 = 0xffff;
UINT32 u2 = u1;//0x0000ffff,高位補(bǔ)0
++i;
}
{
//UINT16 -> INT32
UINT16 u1 = 0xffff;
INT32 n1 = u1;//0xffff, UINT16 -> UINT32 -> INT32
++i;
}
{
//INT32 -> INT16
INT32 n1 = 0xf0001000;
INT16 n2 = n1; //0x1000,直接截?cái)啵〉?字節(jié)
//INT32 -> UINT16
n1 = 0xf1234567;
UINT16 u1 = n1; //0x4567,直接截?cái)?,取?字節(jié)
++i;
}
{
//UINT32 -> INT16
UINT32 u1 = 0xf123f456;
INT16 n1 = u1; //0x4567,直接截?cái)啵〉?字節(jié)
//UINT32 -> UINT16
UINT16 u2 = u1; //0x4567,直接截?cái)?,取?字節(jié)
++i;
}
}
void Test2()
{
// UINT64 u1 = 0x1200003456000078;
// UINT32 u2= UINT32(u1&(UINT64)0x00000000ffffffff);
// UINT32 u3= UINT32(u1>>32);
// printf("UINT64 is: %0.16llx\n", u1);
// printf("UINT32 low: %0.8x\n", u2);
// printf("UINT32 hi: %0.8x\n", u3);
//%d需要一個(gè)INT32(如果不足4字節(jié),轉(zhuǎn)成4字節(jié)),轉(zhuǎn)成INT32,而不關(guān)心變量本身的數(shù)據(jù)類型
//%u需要一個(gè)UIN32(如果不足4字節(jié),轉(zhuǎn)成4字節(jié)),轉(zhuǎn)成UINT32,而不關(guān)心變量本身的數(shù)據(jù)類型
{
//%d/%u + INT32
INT32 n1 = 0xffffffff;
TEA_LOG(LOG_DEBUG, _T("INT32 %d, %u"), n1, n1);
//INT32 -1, 4294967295
}
{
//%d/%u + UINT32
UINT32 u1 = 0xffffffff;
TEA_LOG(LOG_DEBUG, _T("UINT32 %d, %u"), u1, u1);
//UINT32 -1, 4294967295
}
{
//%d/%u + INT16
INT16 n1 = 0xffff;
TEA_LOG(LOG_DEBUG, _T("INT16 %d, %u"), n1, n1);
//INT16 -1, 4294967295
//INT16 -> INT32 -> UINT32
}
{
//%d/%u + UINT16
UINT16 u1 = 0xffffffff;
TEA_LOG(LOG_DEBUG, _T("UINT16 %d, %u"), u1, u1);
//UINT16 65535, 65535
}
}
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