// 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 Endianreturn TRUE;elsereturn 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 4int 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0x89abcdefWORD 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DWORDwLow = 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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