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// int2byte.cpp : 定義控制臺應用程序的入口點。
//
#include "stdafx.h"
#include <Windows.h>
/*
#define MAKEWORD(a, b) ((WORD)(((BYTE)(((DWORD_PTR)(a)) & 0xff)) | ((WORD)((BYTE)(((DWORD_PTR)(b)) & 0xff))) << 8))
#define MAKELONG(a, b) ((LONG)(((WORD)(((DWORD_PTR)(a)) & 0xffff)) | ((DWORD)((WORD)(((DWORD_PTR)(b)) & 0xffff))) << 16))
#define LOWORD(l) ((WORD)(((DWORD_PTR)(l)) & 0xffff))
#define HIWORD(l) ((WORD)((((DWORD_PTR)(l)) >> 16) & 0xffff))
#define LOBYTE(w) ((BYTE)(((DWORD_PTR)(w)) & 0xff))
#define HIBYTE(w) ((BYTE)((((DWORD_PTR)(w)) >> 8) & 0xff))
*/
// ==========================================================
// Big Endian / Small Endian utility functions
// ==========================================================
BOOL IsSmallEndian()
{
DWORD wd = 0x22;
if( *((BYTE *)&wd) == 0x22 ) // Small Endian
return TRUE;
else
return FALSE;
}
void SwapShort(WORD *sp) {
BYTE *cp = (BYTE *)sp, t = cp[0]; cp[0] = cp[1]; cp[1] = t;
}
void SwapLong(DWORD *lp) {
BYTE *cp = (BYTE *)lp, t = cp[0]; cp[0] = cp[3]; cp[3] = t;
t = cp[1]; cp[1] = cp[2]; cp[2] = t;
}
// int 2 byte
BYTE *Int2Byte(int nVal)
{
BYTE *pByte = new BYTE[4];
for (int i = 0; i<4;i++)
{
pByte[i] = (BYTE)(nVal >> 8*(3-i) & 0xff);
}
return pByte;
}
// byte 2 int
int Byte2Int(BYTE *pb)
{
// assume the length of pb is 4
int nValue=0;
for(int i=0;i < 4; i++)
{
nValue += ( pb[i] & 0xFF)<<(8*(3-i));
}
return nValue;
}
int _tmain(int argc, _TCHAR* argv[])
{
//PC， 小端字節
//////////////////////////////////////////////////////////////////////////
BYTE *byte = Int2Byte(0x12345678);
printf("byte[0]=0x%xh,byte[1]=0x%xh,byte[2]=0x%xh, byte[3]=0x%xh\n", byte[0], byte[1], byte[2],byte[3]);
int nVal = Byte2Int(byte);
printf("nVal=0x%xh\n\n",nVal);
//////////////////////////////////////////////////////////////////////////
// 小端字節應該是得到 0xefcdab89, 大端得到0x89abcdef
WORD wLow, wHigh;
DWORD dwData;
BYTE b[4] = {0x89, 0xab, 0xcd, 0xef};
DWORD dwVal = 0xefcdab89;
// DWORD分解成BYTE數組
WORD lo = LOWORD(dwVal),
hi = HIWORD(dwVal);
printf("lo=0x%xh,hi=0x%xh\n", lo, hi);
//BYTE數組組合成DWORD
wLow = MAKEWORD(b[0],b[1]);
wHigh = MAKEWORD(b[2], b[3]);
dwData = MAKELONG(wLow, wHigh);
printf("wLow=0x%xh,wHigh=0x%xh,dwData=0x%xh\n", wLow, wHigh, dwData);
getchar();
return 0;
}
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