问题描述
我想创建只使用MASM而不是MASM32库一个HelloWorld程序。这里是code片断:
.386
.MODEL平,STDCALL
选项casemap:无EXTRN的MessageBox:PROC
EXTRN了ExitProcess:PROC。数据
的HelloWorld DB你好!,0。code
开始: LEA EAX,的HelloWorld
MOV EBX,0
推EBX
推EAX
推EAX
推EBX
调用的MessageBox
推EBX
调用了ExitProcess年底启动
我能够组装这一点使用MASM:
C:\\ MASM32 \\ code>毫升/ C / COFF demo.asm
微软(R)宏汇编版本9.00.21022.08
版权所有(C)微软公司。版权所有。 组装:demo.asm
不过,我无法将其链接:
C:\\ MASM32 \\ code>链接/子系统:窗户/defaultlib:kernel32.lib / defaultlib:用户
32.lib demo.obj
微软(R)增量链接器版本9.00.21022.08
版权所有(C)微软公司。版权所有。demo.obj:错误LNK2001:无法解析的外部符号_MessageBox
demo.obj:错误LNK2001:无法解析的外部符号_ExitProcess
DEMO.EXE:致命错误LNK1120:2无法解析的外部
我包括库链接过程中,所以不知道为什么它仍然悬而未决说的符号?
更新:
C:\\ MASM32 \\ code>链接/子系统:窗户/defaultlib:kernel32.lib / defaultlib:用户
32.lib demo.obj
微软(R)增量链接器版本9.00.21022.08
版权所有(C)微软公司。版权所有。demo.obj:错误LNK2001:解析外部符号_MessageBox @ 16
DEMO.EXE:致命错误LNK1120:1无法解析的外部
更新2:最后的工作code
! .386
.MODEL平,STDCALL
选项casemap:无EXTRN MessageBoxA @ 16:PROC
EXTRN ExitProcess的@ 4:PROC。数据
的HelloWorld DB你好!,0。code
开始: LEA EAX,的HelloWorld
MOV EBX,0
推EBX
推EAX
推EAX
推EBX
调用MessageBoxA @ 16
推EBX
调用了ExitProcess @ 4年底启动
正确的函数名是 MessageBoxA @ 16
和 ExitProcess的@ 4
。
几乎所有的Win32 API函数是STDCALL,所以 @
标志中,然后用它们的参数占用的字节数。
此外,当一个Win32函数采用字符串,有两个变种:一个是需要一个ANSI字符串(名称 A
结尾),一个采用一个统一code字符串(名称是W
结尾)。你提供一个ANSI字符串,所以你要在 A
版本。
当你没有在汇编语言编程,编译器会处理这些点的给你。
I am trying to create a helloworld program using only masm and not masm32 libs. Here is the code snippet:
.386
.model flat, stdcall
option casemap :none
extrn MessageBox : PROC
extrn ExitProcess : PROC
.data
HelloWorld db "Hello There!", 0
.code
start:
lea eax, HelloWorld
mov ebx, 0
push ebx
push eax
push eax
push ebx
call MessageBox
push ebx
call ExitProcess
end start
I am able to assemble this using masm:
c:\masm32\code>ml /c /coff demo.asm
Microsoft (R) Macro Assembler Version 9.00.21022.08
Copyright (C) Microsoft Corporation. All rights reserved.
Assembling: demo.asm
However, I am unable to link it:
c:\masm32\code>link /subsystem:windows /defaultlib:kernel32.lib /defaultlib:user
32.lib demo.obj
Microsoft (R) Incremental Linker Version 9.00.21022.08
Copyright (C) Microsoft Corporation. All rights reserved.
demo.obj : error LNK2001: unresolved external symbol _MessageBox
demo.obj : error LNK2001: unresolved external symbol _ExitProcess
demo.exe : fatal error LNK1120: 2 unresolved externals
I am including the libs during linking, so not sure why it still says unresolved symbols?
UPDATE:
c:\masm32\code>link /subsystem:windows /defaultlib:kernel32.lib /defaultlib:user
32.lib demo.obj
Microsoft (R) Incremental Linker Version 9.00.21022.08
Copyright (C) Microsoft Corporation. All rights reserved.
demo.obj : error LNK2001: unresolved external symbol _MessageBox@16
demo.exe : fatal error LNK1120: 1 unresolved externals
UPDATE 2: Final working code!
.386
.model flat, stdcall
option casemap :none
extrn MessageBoxA@16 : PROC
extrn ExitProcess@4 : PROC
.data
HelloWorld db "Hello There!", 0
.code
start:
lea eax, HelloWorld
mov ebx, 0
push ebx
push eax
push eax
push ebx
call MessageBoxA@16
push ebx
call ExitProcess@4
end start
The correct function names are MessageBoxA@16
and ExitProcess@4
.
Almost all Win32 API functions are stdcall, so their names are decorated with an @
sign, followed by the number of bytes taken up by their parameters.
Additionally, when a Win32 function takes a string, there are two variants: one that takes an ANSI string (name ends in A
) and one that takes a Unicode string (name ends in W
). You're supplying an ANSI string, so you want the A
version.
When you're not programming in assembly the compiler takes care of these points for you.
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