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一、定义 在VC6.0的Microsoft Visual Studio/VC98/Include/windef.h 里，定义了BYTE,WORD,DWORD typedef unsigned long       DWORD; typedef unsigned char       BYTE; typedef unsigned short      WORD; 即: BYTE:8位 WORD: 16位 DWORD: 32位 二、Window 宏 1.LOBYTE( 从给定16位值中提取低位字节) BYTE LOBYTE( WORD wValue // value from which low-order byte is retrieved ); #define LOBYTE(w)   ((BYTE) (w)) 如：WORD w=-0x1234;//w在内存中以补码形式存储:0xedcc,即0xcc(低地址) 0xed（高地址） printf("w的低位字节:%x/n",LOBYTE(w));//输 出：w的低位字节:cc 2.HIBYTE( 从给定16位值中提取高位字节) BYTE HIBYTE( WORD wValue // value from which high-order byte is retrieved ); #define HIBYTE(w)   ((BYTE) (((WORD) (w) >> 8) & 0xFF)) 如：printf("w的高位字节:%x/n",HIBYTE(w));// 输出：w的高位字节:ed 3.LOWORD(从给定32位值中提取低位word) WORD LOWORD( DWORD dwValue // value from which low-order word is retrieved ); #define LOWORD(l)   ((WORD) (l)) 如: DWORD l = 0x12345678;//l在内存中存储为:0x78,0x56,0x34,0x12 printf("l的低位字:%x/n",LOWORD(l));// 输出：l的低位字:5678 4.HIWORD(从给定32位值中提取高位word) WORD HIWORD( DWORD dwValue // value from which high-order word is retrieved ); #define HIWORD(l)   ((WORD) (((DWORD) (l) >> 16) & 0xFFFF)) 如:printf("l的高位字:%x/n",HIWORD(l));//输出：l的高位字:1234 5.MAKEWORD(将两个给定的无符号字符值连接成为一个16位整数) WORD MAKEWORD( BYTE bLow, // low-order byte of short value BYTE bHigh // high-order byte of short value ); #define MAKEWORD(a, b) / ((WORD) (((BYTE) (a)) | ((WORD) ((BYTE) (b))) << 8)) 如: BYTE bLow=0x34,bHigh=0x12; printf("MAKEWORD(%x,%x)=%x/n",bLow,bHigh,MAKEWORD(bLow,bHigh)); 输出结果为: MAKEWORD(34,12)=1234

6.MAKELONG(将两个给定的16位值连接成为一个32位整数)

DWORD MAKELONG( WORD wLow, // low-order word of long value WORD wHigh // high-order word of long value ); #define MAKELONG(a, b) /     ((LONG) (((WORD) (a)) | ((DWORD) ((WORD) (b))) << 16))  如：WORD vLow=0x5678,vHigh=0x1234; printf("MAKELONG(%x,%x)=%x/n",vLow,vHigh,MAKELONG(vLow,vHigh)); 输出结果：MAKELONG(5678,1234)=12345678

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