Urgent help needed with MDI Forms

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  • feltra
    #1

    Urgent help needed with MDI Forms

    Hi,

    The following is from my friend, who has some technical problem at
    present in accessing the web... I am writing for him... Kindly
    request your inputs ASAP, as he has some kind of deadline tomorrow.

    ............... ............... ............... ............... ............... ...............
    I am having an issue with MDI form. I have an MDI form and some Child
    forms. In order to enable for a choice, I am displaying a message box
    in the FormClosing event of both the forms. When the form is closed
    individually, the code works fine, closing the form depending on
    confirmation from the user, other wise the e.Cancel event is set to
    true.
    The problem is when I try to close the MDI form when the child
    forms are open. By virtue of the property in .NET it goes through the
    closing events of all the forms.., finally running the closing event
    of the MDI form, which is undesirable. Is it possible to display a
    different message box and close all child forms and the MDI form also,
    without calling the formclosing method of the child forms?

    If not, how do i display a message box confirmation when user clicks
    on the X on the form? Please help me.. Its urgent...
    ............... ............... ............... ............... ............... ............... ..

    Thanks & Regards,
    -feltra

    Tags: None
    • rowe_newsgroups
      #2
      Re: Urgent help needed with MDI Forms

      On Apr 11, 12:00 pm, "feltra" <fel...@gmail.c omwrote:
      Hi,
      >
      The following is from my friend, who has some technical problem at
      present in accessing the web... I am writing for him... Kindly
      request your inputs ASAP, as he has some kind of deadline tomorrow.
      >
      ............... ............... ............... ............... ............... ..............
      I am having an issue with MDI form. I have an MDI form and some Child
      forms. In order to enable for a choice, I am displaying a message box
      in the FormClosing event of both the forms. When the form is closed
      individually, the code works fine, closing the form depending on
      confirmation from the user, other wise the e.Cancel event is set to
      true.
      The problem is when I try to close the MDI form when the child
      forms are open. By virtue of the property in .NET it goes through the
      closing events of all the forms.., finally running the closing event
      of the MDI form, which is undesirable. Is it possible to display a
      different message box and close all child forms and the MDI form also,
      without calling the formclosing method of the child forms?
      >
      If not, how do i display a message box confirmation when user clicks
      on the X on the form? Please help me.. Its urgent...
      ............... ............... ............... ............... ............... ............... .
      >
      Thanks & Regards,
      -feltra
      Is it possible to display a
      different message box and close all child forms and the MDI form also,
      without calling the formclosing method of the child forms?
      Well, the formclosing method is going to be called on all of them
      period. What your friend could do is have a public property that
      controls which message is shown (if any) on closing. Then you just
      have to set that property before the method is called.
      If not, how do i display a message box confirmation when user clicks
      on the X on the form?
      I'm not in Visual Basic right now, so I can't confirm this, but if you
      want to do something immediately after the "X" is clicked and before
      any formclosed events fire, you'll probably need to override wndproc
      and listen for the appropriate window's message. Then just loop
      through any mdi children the form has and set the above mentioned
      property that will prevent the messages from showing. Below is an old
      post from Herfried Wagner that demonstrates what to do in the wndproc
      method. You should be able to adapt it to what you need.

      Thanks,

      Seth Rowe

      Is there a way I can get into a form's close/minimize/maximize events when
      those buttons (the 3 small squared button in the upper right corner of a
      form) are clicked?
      \\\
      Private Const WM_SYSCOMMAND As Int32 = &H112

      Private Const SC_MAXIMIZE As Int32 = &HF030
      Private Const SC_MINIMIZE As Int32 = &HF020
      Private Const SC_RESTORE As Int32 = &HF120
      Private Const SC_CLOSE As Int32 = &HF060

      Protected Overrides Sub WndProc(ByRef m As Message)
      If m.Msg = WM_SYSCOMMAND Then
      Select Case m.WParam.ToInt3 2()
      Case SC_MAXIMIZE
      Debug.WriteLine ("Form gets maximized.")
      Case SC_MINIMIZE
      Debug.WriteLine ("Form gets minimized.")
      Case SC_RESTORE
      Debug.WriteLine ("Form gets restored.")
      Case SC_CLOSE
      Debug.WriteLine ("Form gets closed.")
      End Select
      End If
      MyBase.WndProc( m)
      End Sub
      ///

      --
      M S Herfried K. Wagner
      M V P <URL:http://dotnet.mvps.org/>
      V B <URL:http://classicvb.org/petition/>

        Comment

        • feltra
          #3
          Re: Urgent help needed with MDI Forms

          Thanks a lot for the quick response, Rowe. I have fwded your message
          to my friend... Hope it solves the problem for him...

          Thanks & Regards,
          -feltra


          On Apr 11, 9:38 pm, "rowe_newsgroup s" <rowe_em...@yah oo.comwrote:
          On Apr 11, 12:00 pm, "feltra" <fel...@gmail.c omwrote:
          >
          >
          >
          Hi,
          >
          The following is from my friend, who has some technical problem at
          present in accessing the web... I am writing for him... Kindly
          request your inputs ASAP, as he has some kind of deadline tomorrow.
          >
          ............... ............... ............... ............... ............... ..............
          I am having an issue with MDI form. I have an MDI form and some Child
          forms. In order to enable for a choice, I am displaying a message box
          in the FormClosing event of both the forms. When the form is closed
          individually, the code works fine, closing the form depending on
          confirmation from the user, other wise the e.Cancel event is set to
          true.
          The problem is when I try to close the MDI form when the child
          forms are open. By virtue of the property in .NET it goes through the
          closing events of all the forms.., finally running the closing event
          of the MDI form, which is undesirable. Is it possible to display a
          different message box and close all child forms and the MDI form also,
          without calling the formclosing method of the child forms?
          >
          If not, how do i display a message box confirmation when user clicks
          on the X on the form? Please help me.. Its urgent...
          ............... ............... ............... ............... ............... ............... .
          >
          Thanks & Regards,
          -feltra
          Is it possible to display a
          different message box and close all child forms and the MDI form also,
          without calling the formclosing method of the child forms?
          >
          Well, the formclosing method is going to be called on all of them
          period. What your friend could do is have a public property that
          controls which message is shown (if any) on closing. Then you just
          have to set that property before the method is called.
          >
          If not, how do i display a message box confirmation when user clicks
          on the X on the form?
          >
          I'm not in Visual Basic right now, so I can't confirm this, but if you
          want to do something immediately after the "X" is clicked and before
          any formclosed events fire, you'll probably need to override wndproc
          and listen for the appropriate window's message. Then just loop
          through any mdi children the form has and set the above mentioned
          property that will prevent the messages from showing. Below is an old
          post from Herfried Wagner that demonstrates what to do in the wndproc
          method. You should be able to adapt it to what you need.
          >
          Thanks,
          >
          Seth Rowe
          >
          Is there a way I can get into a form's close/minimize/maximize events when
          those buttons (the 3 small squared button in the upper right corner of a
          form) are clicked?
          >
          \\\
          Private Const WM_SYSCOMMAND As Int32 = &H112
          >
          Private Const SC_MAXIMIZE As Int32 = &HF030
          Private Const SC_MINIMIZE As Int32 = &HF020
          Private Const SC_RESTORE As Int32 = &HF120
          Private Const SC_CLOSE As Int32 = &HF060
          >
          Protected Overrides Sub WndProc(ByRef m As Message)
          If m.Msg = WM_SYSCOMMAND Then
          Select Case m.WParam.ToInt3 2()
          Case SC_MAXIMIZE
          Debug.WriteLine ("Form gets maximized.")
          Case SC_MINIMIZE
          Debug.WriteLine ("Form gets minimized.")
          Case SC_RESTORE
          Debug.WriteLine ("Form gets restored.")
          Case SC_CLOSE
          Debug.WriteLine ("Form gets closed.")
          End Select
          End If
          MyBase.WndProc( m)
          End Sub
          ///
          >
          --
          M S Herfried K. Wagner
          M V P <URL:http://dotnet.mvps.org/>
          V B <URL:http://classicvb.org/petition/>

            Comment

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