为什么在WM_TIMER中调用MESSAGEBOX后不能关闭对话框

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1. .386
   
2. .model flat,stdcall
   
3. option casemap:none
   
4. ;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   
5. include windows.inc
   
6. include user32.inc
   
7. includelib user32.lib
   
8. include kernel32.inc
   
9. includelib kernel32.lib
   
10. ;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    
11. DLG_MAIN equ 1
    
12. IDC_COUNT equ 100
    
13. ;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    
14. .data?
    
15. hInstance dd ?
    
16. dwTickCount dd ?
    
17. .data
    
18. dwCount dd 0
    
19. .code
    
20. _ProcDlgMain proc hWnd,uMsg,wParam,lParam
    
21. mov eax,uMsg
    
22. .if eax == WM_TIMER
    
23. 
    
24. invoke MessageBox,hWnd,addr dwTickCount,NULL,MB_OK
    
25. invoke KillTimer,hWnd,1
    
26. invoke EndDialog,hWnd,NULL
    
27. 
    
28. .elseif eax == WM_INITDIALOG
    
29. invoke GetTickCount
    
30. mov dwTickCount,eax
    
31. invoke SetTimer,hWnd,1,1000,NULL
    
32. .else
    
33. mov eax,FALSE
    
34. ret
    
35. .endif
    
36. mov eax,TRUE
    
37. ret
    
38. _ProcDlgMain endp
    
39. start:
    
40. invoke GetModuleHandle,NULL
    
41. mov hInstance,eax
    
42. invoke DialogBoxParam,hInstance,DLG_MAIN,NULL,offset _ProcDlgMain,NULL
    
43. end start

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