WM_DeleteWindow 与 GUI_EndDialog 两者的区别？

清风徐来

如题，不是很清楚

有梦为马

GUI_EndDialog不执行实际的删除操作，只是标记当前页面需要删除，在下一次WM_Exec时会检查标记，有删除标记WM_SF_DELETE则执行WM_DeleteWindow，相当于延迟删除的功能。WM_DeleteWindow则是立即删除。通常而言GUI_EndDialog更安全，可避免一些异步的回调错误访问到已删除的widget

glory

楼上所说完全正确，有源代码为证【pdf文档也有说明】：

1. /*********************************************************************
   
2. *
   
3. *       GUI_EndDialog
   
4. */
   
5. void GUI_EndDialog(WM_HWIN hDialog, int r) {
   
6.   WM_DIALOG_STATUS* pStatus;
   
7.   pStatus = GUI_GetDialogStatusPtr(hDialog);
   
8.   if (pStatus) {
   
9.     pStatus->ReturnValue = r;
   
10.     pStatus->Done = 1;
    
11.   }
    
12.   //
    
13.   // WM__DeleteSecure makes sure that the window will be deleted within
    
14.   // the next execution of WM_Exec instead of deleting it immediately.
    
15.   // Deleting immediately makes problems because further messages are
    
16.   // send to the window under certain circumstances.
    
17.   //
    
18.   WM__DeleteSecure(hDialog);
    
19. }

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1. /*********************************************************************
   
2. *
   
3. *       WM__DeleteSecure
   
4. */
   
5. void WM__DeleteSecure(WM_HWIN hWin) {
   
6.   WM_Obj * pWin;
   
7. 
   
8.   pWin = WM_H2P(hWin);
   
9.   pWin->Status |= WM_SF_DELETE;
   
10.   _DeleteWindows = 1;
    
11. }
    
12. 
    
13. /*********************************************************************
    
14. *
    
15. *       _DeleteDelayed
    
16. */
    
17. static void _DeleteDelayed(void) {
    
18.   WM_HWIN  hWin, hWinDelete;
    
19.   WM_Obj * pWin;
    
20. 
    
21.   WM_LOCK();
    
22.   for (hWin = WM__FirstWin; hWin;) {
    
23.     pWin = WM_H2P(hWin);
    
24.     if (pWin->Status & WM_SF_DELETE) {
    
25.       hWinDelete = hWin;
    
26.       hWin = pWin->hNextLin;
    
27.       WM_DeleteWindow(hWinDelete);
    
28.     } else {
    
29.       hWin = pWin->hNextLin;
    
30.     }
    
31.   }
    
32.   _DeleteWindows = 0;
    
33.   WM_UNLOCK();
    
34. }
    
35. 
    
36. /*********************************************************************
    
37. *
    
38. *       WM_Exec1
    
39. */
    
40. int WM_Exec1(void) {
    
41.   /* Delete windows if required */
    
42.   if (_DeleteWindows) {
    
43.     _DeleteDelayed();
    
44.   }
    
45.   /* Poll PID if necessary */
    
46.   if (WM_pfPollPID) {
    
47.     WM_pfPollPID();
    
48.   }
    
49.   if (WM_pfHandlePID) {
    
50.     if (WM_pfHandlePID())
    
51.       return 1;               /* We have done something ... */
    
52.   }
    
53.   if (WM_IsActive) {
    
54.     if (GUI_PollKeyMsg()) {
    
55.       return 1;               /* We have done something ... */
    
56.     }
    
57.   }
    
58. #ifdef WIN32
    
59.   if (WM_PollSimMsg()) {
    
60.     return 1;               /* We have done something ... */
    
61.   }
    
62. #endif
    
63.   if (WM_IsActive && WM__NumInvalidWindows) {
    
64.     WM_LOCK();
    
65.     _DrawNext();
    
66.     WM_UNLOCK();
    
67.     return 1;               /* We have done something ... */
    
68.   }
    
69.   return 0;                  /* There was nothing to do ... */
    
70. }
    

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清风徐来

有梦为马 发表于 2021-1-30 20:43
GUI_EndDialog不执行实际的删除操作，只是标记当前页面需要删除，在下一次WM_Exec时会检查标记，有删除标记 ...

谢谢 明白了