Dialog Application to Hide

JCO

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Sep 17, 2010, 7:42:07 PM9/17/10

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VS2008 C++, MFC

I want a dialog type app to be hidden when executed. I've done some reading
and I think I added all the necessary items to do this, but it still
displays itself when executed. This is what I've done so far. I understand
that a dialog, by design, will be set to "WM_SHOW" at the end of the
OnInitDialog(), therefore I must call WM_WINDOWPOSCHANGED (based on what
I've read). I can walk through the code and it steps into the
WM_WINDOWPOSCHANGED but I can't tell if the flag changes. Can anybody help
me. I'm guessing a changes were made to VS2008 that prevents dialogs from
starting up as Hidden.

//.h file
Created a variable:
protected:
BOOL m_bVisible;

public:
BOOL IsVisible(void) { return m_bVisible==true; }
void SetVisible(BOOL b) { m_bVisible = b; }
BOOL GetVisible(void) { return m_bVisible; }

//.cpp file

Constructor:
m_bVisible(FALSE);

//Message Map
BEGIN_MESSAGE_MAP(CMyTrayDlg, CDialog)
ON_REGISTERED_MESSAGE( UWM_TRAY_CALLBACK, OnTrayCallback )
//}}AFX_MSG_MAP
ON_WM_WINDOWPOSCHANGED()
ON_COMMAND(ID_FILE_HIDE, &CMyTrayDlg::OnFileHide)
ON_COMMAND(ID_FILE_RESTORE, &CMyTrayDlg::OnFileRestore)
ON_COMMAND(ID_FILE_EXIT, &CMyTrayDlg::OnFileExit)
END_MESSAGE_MAP()

//handles message WM_WINDOWPOSCHANGED
void CMyTrayDlg::OnWindowPosChanged(WINDOWPOS* lpwndpos)
{
if( !IsVisible() )
lpwndpos->flags &= ~SWP_SHOWWINDOW;

CDialog::OnWindowPosChanged(lpwndpos);

// TODO: Add your message handler code here
}

Joseph M. Newcomer

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Sep 18, 2010, 3:54:57 AM9/18/10

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Read my essay on dialog-based apps on my MVP Tips site; Nish allowed me to include his
code for hidden-at-startup dialog-based apps.
joe

Joseph M. Newcomer [MVP]
email: newc...@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

JCO

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Sep 19, 2010, 9:10:07 AM9/19/10

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Thanks Joseph. I had already read it and implemented you fix, however, it
will not start up in hidden mode. I did not include the code to Hide &
Restore the app (via menu) but I figured that was obvious. Plus, using the
menu works fine. I can hide the app and by using the menu in the System
Tray Icon, I can Restore (un-hide) the dialog.
Thanks

"Joseph M. Newcomer" <newc...@flounder.com> wrote in message
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Joseph M. Newcomer

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Sep 19, 2010, 7:22:42 PM9/19/10

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Read his code carefully; it really does come up hidden if you use the code as shown.
joe

JCO

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Sep 21, 2010, 1:18:46 PM9/21/10

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The only way I was able to get the application to start out hidden, is by
the code below:

void CMyTrayDlg::OnWindowPosChanged(WINDOWPOS* lpwndpos)
{
if( !IsVisible() )
{
lpwndpos->flags &= ~SWP_SHOWWINDOW;

ShowWindow(SW_HIDE); //should not have to do
RegisterTray(); //should not have to do
}
CDialog::OnWindowPosChanged(lpwndpos);
}

However, this method creates the "Flash" that you discussed in your essay.
I'm not sure what I'm doing wrong. I'm believe I followed your essay
correctly. My original post has the code for your review.
Thanks

"Joseph M. Newcomer" <newc...@flounder.com> wrote in message

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