汇编-LENGTHOF返回数组中元素的个数
LENGTH OF操作符计算数组中元素的个数
.386 .model flat,stdcall .stack 4096 ExitProcess PROTO,dwExitCode:DWORD .data byte1 BYTE 10,20,30 arrayl WORD 30 DUP(?) ,0,0 array2 WORD 5 DUP(3 DUP(?) ) ;二维数组 ;如果在数组定义中出现了嵌套的DUP操作符, 则LENGTHOF返回的是两个计数值的乘积 array3 DWORD 1, 2, 3, 4 digitStr BYTE "12345678",0 .code main PROC mov eax,LENGTHOF byte1 mov ebx,LENGTHOF arrayl mov ecx,LENGTHOF array2 mov edx,LENGTHOF array3 mov esi,LENGTHOF digitStr ;EAX = 00000003h EBX = 00000020h ECX = 0000000Fh EDX = 00000004h ESI = 00000009h INVOKE ExitProcess,0 main ENDP END main
如果数组定义占据了多个程序行, 则LENGTHOF只针对第一行定义的数据
.386 .model flat,stdcall .stack 4096 ExitProcess PROTO,dwExitCode:DWORD .data myArray BYTE 10, 20, 30, 40, 50 BYTE 60, 70, 80, 90, 100 .code main PROC mov eax,LENGTHOF myArray ;EAX = 00000005 INVOKE ExitProcess,0 main ENDP END main
也可以在第一行结尾处用逗号,并在下一行继续进行数组初始化
.386 .model flat,stdcall .stack 4096 ExitProcess PROTO,dwExitCode:DWORD .data myArray BYTE 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 .code main PROC mov eax,LENGTHOF myArray ;EAX = 0000000Ah INVOKE ExitProcess,0 main ENDP END main