一、条件汇编伪指令和宏使用可以使汇编程序更加灵活

　　

二、通过伪指令来检查函数的参数是否为空，如果为空则输出警告信息

　　

INCLUDE Irvine32.incincludelib Irvine32.libincludelib kernel32.libincludelib user32.lib.datasource    BYTE    "this is source string",0.codemWriteStr MACRO    string        IFB 
     
                  ECHO --------------------------------------        ECHO * ERROR parameter missing in mWriteStr        ECHO * no code generated        ECHO --------------------------------------        EXITM    ENDIF        push edx    mov edx,offset string    call WriteString    pop edxendmmain PROC    ;mWriteStr source    mWriteStr    exitmain ENDPEND main
     

编译上面的程序时会输出警告信息：

C:\RadASM\Masm32\Bin\ML.EXE /c /coff /Cp /nologo /I"C:\RadASM\Masm32\Include" "MacroTest.asm" Assembling: MacroTest.asm--------------------------------------* ERROR parameter missing in mWriteStr* no code generated--------------------------------------C:\RadASM\Masm32\Bin\LINK.EXE /SUBSYSTEM:CONSOLE /RELEASE /VERSION:4.0 /LIBPATH:"C:\RadASM\Masm32\Lib" /OUT:"MacroTest.exe" "MacroTest.obj"Microsoft (R) Incremental Linker Version 5.12.8078Copyright (C) Microsoft Corp 1992-1998. All rights reserved.构建完成.总共编译时间 203 毫秒