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結(jié)構(gòu)和聯(lián)合分別用 struct、union 定義, 都是 ends 結(jié)束定義.
它們使用方法相同, 并可以互相嵌套; 主要區(qū)別是后者的各成員共用同一個地址.
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結(jié)構(gòu)示例:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

;定義結(jié)構(gòu)
MyPoint struct
??? X dd ?
??? Y dd ?
MyPoint ends

.data
??? ;聲明結(jié)構(gòu), 使用 <>、{} 均可
??? pt1 MyPoint <>
??? pt2 MyPoint {}
??? pt3 MyPoint <33,44>
??? pt4 MyPoint {55,66}
??? pt5 MyPoint {77,}
??? pt6 MyPoint {,88}
??? pt7 MyPoint {,}
.code
main proc
??? mov pt1.X, 11
??? mov pt1.Y, 22
??? inc pt1.X
??? PrintDec pt1.X ;12
??? PrintDec pt1.Y ;22
??? ;
??? PrintDec pt2.X ;0
??? PrintDec pt2.Y ;0
??? ;
??? PrintDec pt3.X ;33
??? PrintDec pt3.Y ;44
??? ;
??? PrintDec pt4.X ;55
??? PrintDec pt4.Y ;66
??? ;
??? PrintDec pt5.X ;77
??? PrintDec pt5.Y ;0
??? ;
??? PrintDec pt6.X ;0
??? PrintDec pt6.Y ;88
??? ;
??? PrintDec pt7.X ;0
??? PrintDec pt7.Y ;0
??? ret
main endp
end main
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聯(lián)合示例:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

;定義聯(lián)合
MyUnion union
??? D dd ?
??? W dw ?
??? B db ?
MyUnion ends

.data
??? u1 MyUnion <>
??? u2 MyUnion {1122h} ;只能有一個初始值
.code
main proc
??? mov u1.D, 12345678h
??? PrintHex u1.D ;12345678
??? PrintHex u1.W ;5678
??? PrintHex u1.B ;78
??? ;
??? PrintHex u2.D ;00001122
??? PrintHex u2.W ;1122
??? PrintHex u2.B ;22
??? ret
main endp
end main
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用寄存器引用結(jié)構(gòu)變量:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

MyPoint struct
??? X dd ?
??? Y dd ?
MyPoint ends

.data
??? pt1 MyPoint <11,22>
.code
main proc
??? lea ebx, pt1
??? PrintDec (MyPoint ptr [ebx]).X ;11
??? PrintDec (MyPoint ptr [ebx]).Y ;22
??? ret
main endp
end main
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定義時的數(shù)據(jù)初始化:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

MyStruct struct
??? FName db 12 dup(0)
??? FAge? db 66
MyStruct ends

.data
??? u1 MyStruct <>
??? u2 MyStruct <'張三', 88>
.code
main proc
??? PrintString u1.FName ;
??? PrintDec??? u1.FAge? ;66
???
??? PrintString u2.FName ;張三
??? PrintDec??? u2.FAge? ;88
??? ret
main endp
end main
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使用 SYSTEMTIME 結(jié)構(gòu)獲取系統(tǒng)時間的例子:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

;SYSTEMTIME 結(jié)構(gòu)定義在 windows.inc
;GetLocalTime 函數(shù)聲明在 kernel32.inc
.data
??? sysTime SYSTEMTIME <>
.code
main proc
??? invoke GetLocalTime, addr sysTime
??? PrintDec sysTime.wYear? ;2010
??? PrintDec sysTime.wMonth ;4
??? PrintDec sysTime.wDay?? ;22
??? ret
main endp
end main
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結(jié)構(gòu)嵌套:
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.386
.model flat, stdcall

include??? windows.inc
include??? kernel32.inc
include??? masm32.inc
include??? debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

Pt struct
?? X dd ?
?? Y dd ?
Pt ends

Rect struct
??? Left? Pt <>
??? Right Pt <>
Rect ends

.data
??? r1 Rect <>
??? r2 Rect <<55,66>, <77,88>>
.code
main proc
??? mov r1.Left.X, 11
??? mov r1.Left.Y, 22
??? mov r1.Right.X, 33
??? mov r1.Right.Y, 44
???
??? PrintDec r1.Left.X? ;11
??? PrintDec r1.Left.Y? ;22
??? PrintDec r1.Right.X ;33
??? PrintDec r1.Right.Y ;44
???
??? PrintDec r2.Left.X? ;55
??? PrintDec r2.Left.Y? ;66
??? PrintDec r2.Right.X ;77
??? PrintDec r2.Right.Y ;88
??? ret
main endp
end main

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