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Modeless dialog quits by itself immediatly after creation

This is a discussion on Modeless dialog quits by itself immediatly after creation within the C++ Programming forums, part of the General Programming Boards category; Hi, I am using Modeless dialog in a CAD API program, launching it, it closes immediatly after it is created. ...

  1. #1
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    Modeless dialog quits by itself immediatly after creation

    Hi,

    I am using Modeless dialog in a CAD API program, launching it, it closes immediatly after it is created.

    I am using this two lines to create the dialog.

    MyDialog dlg;
    dlg.Create(IDD_DIALOG_SA,0);
    dlg.ShowWindow(SW_SHOW);


    It just flickers in the sceen, If I show the window, it stays no time. It doesnot call any message functions. Any one knows the reason please suggest resolution.

    Thanks in advance.

    Joseph

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    You need to run the message loop (RunModalLoop). It will block until the function closes, but it will not force it to be modal.
    Last edited by Elysia; 05-17-2011 at 07:24 AM.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
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    Where are you creating this dialog?

    Is sounds like the dialog variable is going out of scope right after the showwindow, meaning the function where the dialog is created ends, killing your dialog variable, therefore no dialog.

    You will need to have a variable for the dialog that will persist longer than the function it is created in.

  4. #4
    C++まいる!Cをこわせ! Elysia's Avatar
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    Regardless, you will still need to pump messages, which you do with RunModalLoop, and it will block, so there is no problem with running out of scope.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  5. #5
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    Thanks Dave. That worked. I have not used pointer to create dlg, used as local variable

    Thanks for all the replies.
    Last edited by joseph_isreavel; 05-18-2011 at 07:16 AM.

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