DWORD WORD BYTE 相互转换    DWORD  4个字节  WORD     2个字节  BYTE       1个字节 

1） DWORD--->WORD

　

    DWORD dw=0;                  WORD hW=HIWORD(dw);      WORD lW=LOWORD(lw);  

2）WORD--->DWORD

　

    DWORD dw=0;                  WORD hW=HIWORD(dw);      WORD lW=LOWORD(lw);                  dw=MAKELONG(lw,hw);  

3） WORD---->BYTE

　

    WORD word=0;      BYTE hb=HIBYTE(word);      BYTE lb=LOBYTE(word);  

4）BYTE------>WORD

　

    WORD word=0;      BYTE hb=HIBYTE(word);      BYTE lb=LOBYTE(word);            word = MAKEWORD(lb,hb);  

5) "ABCD" 或L“你好” 这样的四字节字符串 转换为DWORD 进行保存

　

    WCHAR str[3]={L"你好"};            memcpy(&dWord,str,4);                  WCHAR hChar=(WCHAR)HIWORD(dWord); // 好      WCHAR lChar=(WCHAR)LOWORD(dWord); // 你  

综合例子：

　

        char  *name="abcd";          DWORD dWord=0;                      WORD hw=HIWORD(dWord);          WORD lw=LOWORD(dWord);                BYTE hhb=HIBYTE(hw);          BYTE lhb=LOBYTE(hw);                BYTE hlb=HIBYTE(lw);          BYTE llb=LOBYTE(lw);                            hhb   =   name[0];           hlb   =   name[1];           lhb   =   name[2];           llb   =   name[3];                 hw   =   MAKEWORD(hlb,   hhb);  //ba          lw   =   MAKEWORD(llb,   lhb);  //dc                //dWord 为 "dcba"          dWord   =   MAKELONG(lw,   hw); //dcba                hw=HIWORD(dWord); // ba          lw=LOWORD(dWord); // dc                hhb=HIBYTE(hw);  // a          lhb=LOBYTE(hw);  // b                lhb=HIBYTE(lw);  // c          llb=LOBYTE(lw);  // d                        ///  对比程序  ///                // dWord 为 "abcd"          memcpy(&dWord,name,4);                hw=HIWORD(dWord); // cd          lw=LOWORD(dWord); // ab                hhb=HIBYTE(hw);   // d          lhb=LOBYTE(hw);   // c                lhb=HIBYTE(lw);   // b          llb=LOBYTE(lw);   // a  

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