Removing the app's Taskbar button

I'm trying to fill the NOTIFYICONDATA struct and pass it to
Shell_NotifyIcon() to delete my app's icon from the taskbar, but the Shell_NotifyIcon() method fails.  ( I'd also like to be able to add its icon in the system tray.)

I create an SDI app with the wizard, and put the following code at the end of InitInstance():

      NOTIFYICONDATA tnid;
      int res;

      tnid.cbSize = sizeof(NOTIFYICONDATA);
      tnid.hWnd = m_pMainWnd->m_hWnd;
      tnid.uID = IDR_MAINFRAME;
      tnid.uFlags = NIF_ICON;
      tnid.hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
      tnid.szTip[0] = '\0';
         
      res = Shell_NotifyIcon(NIM_DELETE, &tnid);

I must be setting some of the fields incorrectly.  Does someone know how to fill this struct?  Am I missing something?

Thanks!

P.S. Is the code/process any different for a dialog-based app?
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mcsilverAsked:
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davmarcConnect With a Mentor Commented:
I think you misunderstood the documentation.
Shell_NotifyIcon() adds/deletes/changes only icons in the status area of the taskbar (also known as Tray Notification Area).
Hence it can help you with your second request - adding an icon to the system tray.

If you want your app not to be shown in the taskbar like all other processes generally are, you should not create any windows...alternatively, try registering your app as a service.

Davide Marcato.
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mcsilverAuthor Commented:
The answer given was clear and easy to understand.  And it did clear up some confusion that I had.  But as for getting my code (included in the question) to work, the question was not answered.  Even if what it's supposed to do is to put an icon in the System Tray, the code still fails. :(  Help.  Also, for implementing the first part of the question, I just looked up "register" and "service" in the help and got no where.  Help.
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davmarcCommented:
Your code tries to remove a TNA icon that simply doesn't exist, that's why it doesn't work. This cannot be resolved.
If you want to *add* an icon, call Shell_NotifyIcon(NIM_ADD, &tnid).

As for the service thing, call RegisterServiceProcess().

Davide Marcato.
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