OFN_PATHMUSTEXIST or OFN_LONGNAMES or\ OFN_EXPLORER

.IF uMsg==WM_CREATE invoke GetMenu,hWnd ; Получаем хэндл меню mov hMenu,eax mov ofn.lStructSize,SIZEOF ofn
push hWnd pop ofn.hWndOwner push hInstance pop ofn.hInstance
mov ofn.lpstrFilter, OFFSET FilterString mov ofn.lpstrFile, OFFSET buffer mov ofn.nMaxFile,MAXSIZE .ELSEIF uMsg==WM_DESTROY
.if hMapFile!=0 call CloseMapFile .endif invoke PostQuitMessage,NULL
.ELSEIF uMsg==WM_COMMAND mov eax,wParam .if lParam==0 .if ax==IDM_OPEN
mov ofn.Flags, OFN_FILEMUSTEXIST or \ OFN_PATHMUSTEXIST or OFN_LONGNAMES or\ OFN_EXPLORER or OFN_HIDEREADONLY invoke GetOpenFileName, ADDR ofn
.if eax==TRUE invoke CreateFile,ADDR buffer,\ GENERIC_READ ,\ 0,\
NULL,OPEN_EXISTING,FILE_ATTRIBUTE_ARCHIVE,\ NULL mov hFileRead,eax
invoke CreateFileMapping,hFileRead,NULL,PAGE_READONLY,0,0,NULL mov hMapFile,eax mov eax,OFFSET buffer
movzx edx,ofn.nFileOffset add eax,edx invoke SetWindowText,hWnd,eax invoke EnableMenuItem,hMenu,IDM_OPEN,MF_GRAYED
invoke EnableMenuItem,hMenu,IDM_SAVE,MF_ENABLED .endif .elseif ax==IDM_SAVE mov ofn.Flags,OFN_LONGNAMES or\
OFN_EXPLORER or OFN_HIDEREADONLY invoke GetSaveFileName, ADDR ofn .if eax==TRUE invoke CreateFile,ADDR buffer,\
GENERIC_READ or GENERIC_WRITE ,\ FILE_SHARE_READ or FILE_SHARE_WRITE,\
NULL,CREATE_NEW,FILE_ATTRIBUTE_ARCHIVE,\ NULL mov hFileWrite,eax
invoke MapViewOfFile,hMapFile,FILE_MAP_READ,0,0,0 mov pMemory,eax invoke GetFileSize,hFileRead,NULL invoke WriteFile,hFileWrite,pMemory,eax,ADDR SizeWritten,NULL invoke UnmapViewOfFile,pMemory call CloseMapFile invoke CloseHandle,hFileWrite
invoke SetWindowText,hWnd,ADDR AppName invoke EnableMenuItem,hMenu,IDM_OPEN,MF_ENABLED invoke EnableMenuItem,hMenu,IDM_SAVE,MF_GRAYED .endif
.else invoke DestroyWindow, hWnd .endif .endif
.ELSE invoke DefWindowProc,hWnd,uMsg,wParam,lParam ret .ENDIF
xor eax,eax ret WndProc endp
CloseMapFile PROC invoke CloseHandle,hMapFile mov hMapFile,0
invoke CloseHandle,hFileRead ret CloseMapFile endp
end start
Анализ:
invoke CreateFile,ADDR buffer,\ GENERIC_READ ,\ 0,\ NULL,OPEN_EXISTING,FILE_ATTRIBUTE_ARCHIVE,\ NULL

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