winapi - Hide an MFC dialog window

Question

I have written an MFC dialog based application which is launched by some another application. For now, I have not added any code. It is just the default files that I got. The other application can successfully launch my application.

I am trying to hide the window of my application when the other application launches it.

BOOL CMyApp::InitInstance()
{
    CMyAppDlg dlg;
    m_pMainWnd = &dlg;        

    INT_PTR nResponse = dlg.DoModal();

    if (nResponse == IDOK)
    {
    }
    else if (nResponse == IDCANCEL)
    { 
    }

    return FALSE;
}

I tried to use:

dlg.ShowWindow(SW_HIDE) 

but it still does not hide the window.

How can I accomplish this task?

Answer 1

I'd suggest you have another problem someplace.

If you create a totally new, blank MFC app (Visual Studio 2010) then in App::InitInstance, setting SW_HIDE rather than SW_SHOW does cause the resultant window to be hidden.

BOOL CProj1App::InitInstance()
{

// boilerplate code
      . . . 

// The one and only window has been initialized, so show and update it
m_pMainWnd->ShowWindow(SW_HIDE);   // WORKS!
m_pMainWnd->UpdateWindow();

return TRUE;
}