Conversion between integer variables (INT) and byte arrays (byte [])

// Int2byte. cpp: defines the entry point of the console application. // # 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) & 0 xFFFF) | (DWORD) (Word) (dword_ptr) (B) & 0 xFFFF ))) <16) # define loword (L) (Word) (dword_ptr) (L) & 0 xFFFF) # define hiword (L) (word) (dword_ptr) (L)> 16) & 0 xFFFF) # 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 bytebyte * 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 intint 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, small-end bytes ////////////////////////////////////// /// // 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", nval ); //////////////////////////////////////// /// // small-end bytes should be 0xefcdab89, 0x89abcdefword wlow, whigh; DWORD dwdata; byte B [4] = {0x89, 0xab, 0xcd, 0xef}; DWORD dwval = 0xefcdab89; // DWORD into byte array word Lo = loword (dwval), HI = hiword (dwval); printf ("Lo = 0x % XH, HI = 0x % XH \ n ", lo, hi); // combines byte arrays into 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 ;}