System Tray Icon Hint Message (BCB4.0)

I am using Borland C++ Builder 4.0 pro

I have an application that places an icon in the system tray, when the user minimizes the application it goes to the icon, and can be restored by double clicking the icon.  There also is a hint message that is displayed when the mouse is over the icon.

I would like the message to be updated when the user places the mouse over the icon.

At present I can update the hint message when the application starts, and when the user switches to other parts of the application, but NOT when the user actually has the mouse over the icon (just before the hint message is actually displayed.)

Below are the functions that handle the icon, and where I believe I need to make changes (though I am not 100% for sure about this)

void __fastcall TformMain::AddIcon()
{
   NOTIFYICONDATA IconData;
   IconData.cbSize = sizeof(NOTIFYICONDATA);
   IconData.uID = IDC_TRAYICON;
   IconData.hWnd = Handle;
   IconData.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
   IconData.uCallbackMessage = WM_TRAYNOTIFY;
   HINT_MESSAGE = displayHintMessage();
   lstrcpy(IconData.szTip, HINT_MESSAGE);
   IconData.hIcon = TrayIcon->Handle;

   Shell_NotifyIcon(NIM_ADD, &IconData);
}

void __fastcall TformMain::ModifyIcon()
{
   NOTIFYICONDATA IconData;
   IconData.cbSize = sizeof(NOTIFYICONDATA);
   IconData.uID = IDC_TRAYICON;
   IconData.hWnd = Handle;
   IconData.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
   IconData.uCallbackMessage = WM_TRAYNOTIFY;
   HINT_MESSAGE = displayHintMessage();  
   lstrcpy(IconData.szTip, HINT_MESSAGE);
   IconData.hIcon = TrayIcon->Handle;

   Shell_NotifyIcon(NIM_MODIFY, &IconData);
}

void __fastcall TformMain::WMTrayNotify(TMessage &Msg)
{
   switch(Msg.LParam)
   {
      case WM_RBUTTONUP:
         POINT WinPoint;
         GetCursorPos(&WinPoint);
         SetForegroundWindow(Handle);
         popupMenu->Popup(WinPoint.x, WinPoint.y);
         PostMessage(Handle, WM_NULL, 0, 0);
         break;
      case WM_LBUTTONDBLCLK:
         Application->Restore();
         break;
   }
}

Thanks in advance. . .
LordDameinAsked:
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DanRollinsConnect With a Mentor Commented:
In your WMTrayNotify handler, you could check for WM_MOUSEMOVE and at that time, call your ModifyIcon fn to update the text.

In my app, I use a different technique:  I have a timer that checks for status changes once every second, and updates the tip text (via my equivalent of your ModifyIcon() fn) if it has changed.

-- Dan
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LordDameinAuthor Commented:
Wow.  I have implemented a timer to check for status changes and update the tip text if needed.  That is a great technique.  Thanks! ! !
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DanRollinsCommented:
Glad to help.

You can also change the icon image.  For instance it looks pretty snazzy if the the icon gets a red 'x' over it when the program is stopped.  Advanced: If you cycle the icon changes more often, you can even make the thing look animated (though
that is distracting).

Just a side comment... that technique originally got me into trouble becasue I was doing a LoadIcon with each call -- rather than just assigning IconData.hIcon= a_pre_loaded_handle .

LoadIcon can be called repeatedly without problem (the system just returns the handle to the previously-loaded icon), so that was alright.... until I switched to
    LoadImage(...,...,IMAGE_ICON, 16,16,...)
so that I could display a 16x16 icon (it appears less 'blurred' when displayed in the tray).  In that case, each call to LoadImage chewed up a resouce handle (a resource leak!).  I actually shipped some product that way.  After running for a few hours, the entire operating system started croaking... menus broke, fonts failed, it was embarassing.

-- Dan
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