我取了一个示例代码,该代码从FASM示例目录中创建一个简单的DLL,并根据我的需要对其进行调整。但是,当我进行一些(从我的 POV 中无辜)更改时,生成的二进制文件会损坏 - 运行使用此库的 exe 会产生错误代码0xC000007B又名INVALID_IMAGE_FORMAT。
DLL 代码:
; DLL creation example
format PE GUI 4.0 DLL
entry DllEntryPoint
include 'win32a.inc'
section '.text' code readable executable
proc DllEntryPoint hinstDLL,fdwReason,lpvReserved
mov eax,TRUE
ret
endp
proc ShowErrorMessage hWnd,dwError
local lpBuffer:DWORD
lea eax,[lpBuffer]
invoke FormatMessage,FORMAT_MESSAGE_ALLOCATE_BUFFER+FORMAT_MESSAGE_FROM_SYSTEM,0,[dwError],LANG_NEUTRAL,eax,0,0
invoke MessageBox,[hWnd],[lpBuffer],NULL,MB_ICONERROR+MB_OK
ret
endp
proc ShowLastError hWnd
ret
endp
section '.idata' import data readable writeable
library kernel,'KERNEL32.DLL',
user,'USER32.DLL'
import kernel,
GetLastError,'GetLastError',
SetLastError,'SetLastError',
FormatMessage,'FormatMessageA',
LocalFree,'LocalFree'
import user,
MessageBox,'MessageBoxA'
section '.edata' export data readable
export 'DLL.DLL',ShowErrorMessage,'ShowErrorMessage',ShowLastError,'ShowLastError'
section '.reloc' fixups data readable discardable
可执行代码:
format PE GUI 4.0
entry start
include 'win32a.inc'
section '.text' code readable executable
start:
jmp ShowLastError
section '.idata' import data readable writeable
library mydll,'DLL.DLL'
import mydll,
ShowLastError,'ShowLastError'
当我改变时,说:
export 'DLL.DLL',ShowErrorMessage,'ShowErrorMessage',ShowLastError,'ShowLastError'
行到
export 'DLL.DLL',ShowLastError,'ShowLastError'
代码中断。如果我将ShowErrorMessage
身体更改为仅ret
,也会发生同样的情况。
我对此完全感到困惑。这是一个 FASM 错误,还是我做错了什么?
我无法找到对此的解释,但至少我找到了解决方法。更改下一行
section '.reloc' fixups data readable discardable
到只是
data fixups
end data
修复了此问题。