DoModal()函数的功能

帮忙回答一下，好吗？具体点。 问题点数：20、回复次数：4Top

1 楼bigelm（枯燥着快乐着）回复于 2005-06-30 15:12:40 得分 0

CDialog::DoModal    
  virtual   int   DoModal(   );  
   
  Return   Value  
   
  An   int   value   that   specifies   the   value   of   the   nResult   parameter   that   was   passed   to   the   CDialog::EndDialog   member   function,   which   is   used   to   close   the   dialog   box.   The   return   value   is   –1   if   the   function   could   not   create   the   dialog   box,   or   IDABORT   if   some   other   error   occurred.  
   
  Remarks  
   
  Call   this   member   function   to   invoke   the   modal   dialog   box   and   return   the   dialog-box   result   when   done.   This   member   function   handles   all   interaction   with   the   user   while   the   dialog   box   is   active.   This   is   what   makes   the   dialog   box   modal;   that   is,   the   user   cannot   interact   with   other   windows   until   the   dialog   box   is   closed.  
   
  If   the   user   clicks   one   of   the   pushbuttons   in   the   dialog   box,   such   as   OK   or   Cancel,   a   message-handler   member   function,   such   as   OnOK   or   OnCancel,   is   called   to   attempt   to   close   the   dialog   box.   The   default   OnOK   member   function   will   validate   and   update   the   dialog-box   data   and   close   the   dialog   box   with   result   IDOK,   and   the   default   OnCancel   member   function   will   close   the   dialog   box   with   result   IDCANCEL   without   validating   or   updating   the   dialog-box   data.   You   can   override   these   message-handler   functions   to   alter   their   behavior.  
   
  Note       PreTranslateMessage   is   now   called   for   modal   dialog   box   message   processing.  
   
  Example  
   
  void   CTstApp::OnAppAbout()  
  {  
        //   Construct   the   dialog   box   passing   the    
        //   ID   of   the   dialog   template   resource  
        CDialog   aboutDlg(IDD_ABOUTBOX);  
   
        //   Create   and   show   the   dialog   box  
        int   nRet   =   -1;  
        nRet   =   aboutDlg.DoModal();  
   
        //   Handle   the   return   value   from   DoModal  
        switch   (   nRet   )  
        {  
        case   -1:    
              AfxMessageBox("Dialog   box   could   not   be   created!");  
              break;  
        case   IDABORT:  
              //   Do   something  
              break;  
        case   IDOK:  
              //   Do   something  
              break;  
        case   IDCANCEL:  
              //   Do   something  
              break;  
        default:  
              //   Do   something  
              break;  
        };  
  }  
   
  够详细吗？Top

2 楼tans75（品味人生）回复于 2005-06-30 15:21:46 得分 0

怎么全是E文，看不懂呀！Top

3 楼hxue1981（雨山）回复于 2005-06-30 15:21:46 得分 5

顾名思义：DO     Modal  
  让对话框模式生效。主要还是用它来弹出一个对话框！  
  如CMyDialog   dlg;  
        dlg.DoModal();//弹出CMyDialog类定义的对话框Top

4 楼qrlvls（ 空 气 ）回复于 2005-06-30 15:31:11 得分 15

DoModal   实际上实现了对话框的创建、显示、关闭的全过程，实际上是一个函数中完成的  
  而且   DoModal   生成的是一个模态的对话框  
  DoModal   在一个函数中完成所有这些功能实际上依赖于它所伪造的一个消息循环   RunModalLoop  
  如果有举的话可以参照   MFC   的源代码Top

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