How to Change Modless dialog to Modal

Posted on 2003-02-21
Medium Priority
Last Modified: 2013-11-20
Hi there,
I want to switch the style of my dialog based application form Modless to Sytem Modal. I tried setting 'DS_SYSMODAL' flag in my InitDialog function
BOOL CMyDlg::OnInitDialog()
  DWORD style= this->GetStyle( );
  if(!(style & DS_SYSMODAL)){
     DWORD dwAdd = DS_SYSMODAL    ;
     this->ModifyStyleEx( 0, dwAdd, 0 );
This seems to set the style, but the displayed window is still Modless!! Isn't this a valid flag? or Am I doing this very late??
Is there any other way to achieve this?
Thanks for your help
Question by:DOJI
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Expert Comment

ID: 7994823
You can set the system modal style in the resource editor property pages for the dialog template.

Expert Comment

ID: 7998530
It's been a while, but I think it's more how you invoke the display of the dialog box.  Use CDialog::DoModal() to invoke it and you'll get modal behavior.

Author Comment

ID: 8007406
Hi northernchill,
Changing in Resource Editor is not an option. I want to do it dynamically sometimes modal and sometimes modeless.
Hi knitzl,
I am using DoModal() to inovoke the dialog. It invokes the dialog based on the property set in resource editor. In my resource editor the property is set to 'System Modal', I need to change the dialog to 'Modless' on certain condtions.
Thanks for the reply

Accepted Solution

northernchill earned 100 total points
ID: 8008698
I am a little confused, in your resource editor the System Modal property is set?  

If this is the case, when you want it to be modeless, do not call DoModal(), simply instantiate the object, create the window and then call ShowWindow().  This is how I normally display modeless dialogs.



Then when you want it to be modal,



Author Comment

ID: 8016997
Thanks northernchill, this will work. But on a second thought,I think, for my application it would be better to switch the dialog between 'Modal' and 'SystemModal'. In that case you can't use ShowWindow call. Is this possible to change a dialog to SystemModal after calling DoModal? Or By overriding DoModal function?? Or by setting some flag or changing the style??
Thanks for your suggestions

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