60 lines
1.2 KiB
NASM
60 lines
1.2 KiB
NASM
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; DLL creation example
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format PE GUI 4.0 DLL
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entry DllEntryPoint
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include 'win32a.inc'
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section '.text' code readable executable
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proc DllEntryPoint hinstDLL,fdwReason,lpvReserved
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mov eax,TRUE
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ret
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endp
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; VOID ShowErrorMessage(HWND hWnd,DWORD dwError);
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proc ShowErrorMessage hWnd,dwError
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local lpBuffer:DWORD
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lea eax,[lpBuffer]
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invoke FormatMessage,FORMAT_MESSAGE_ALLOCATE_BUFFER+FORMAT_MESSAGE_FROM_SYSTEM,0,[dwError],LANG_NEUTRAL,eax,0,0
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invoke MessageBox,[hWnd],[lpBuffer],NULL,MB_ICONERROR+MB_OK
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invoke LocalFree,[lpBuffer]
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ret
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endp
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; VOID ShowLastError(HWND hWnd);
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proc ShowLastError hWnd
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invoke GetLastError
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stdcall ShowErrorMessage,[hWnd],eax
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ret
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endp
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section '.idata' import data readable writeable
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library kernel,'KERNEL32.DLL',\
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user,'USER32.DLL'
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import kernel,\
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GetLastError,'GetLastError',\
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SetLastError,'SetLastError',\
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FormatMessage,'FormatMessageA',\
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LocalFree,'LocalFree'
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import user,\
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MessageBox,'MessageBoxA'
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section '.edata' export data readable
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export 'ERRORMSG.DLL',\
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ShowErrorMessage,'ShowErrorMessage',\
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ShowLastError,'ShowLastError'
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section '.reloc' fixups data readable discardable
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if $=$$
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dd 0,8 ; if there are no fixups, generate dummy entry
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end if
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