{***************************************************** * How can I create a tray icon? *
Fortunately, creating an application that runs in the system tray is pretty easy - only one (API) function, Shell_NotifyIcon, is needed to accomplish the task. The function is defined in the ShellAPI unit and requires two parameters.
The first parameter (dwMessage) specifies the action to be taken. This parameter can be one of the following values:
NIM_ADD: Adds an icon to the status area. NIM_DELETE: Deletes an icon from the status area. NIM_MODIFY: Modifies an icon in the status area.
* To display an icon in the system tray, call Shell_NotifyIcon with the NIM_ADD flag.
* Any time you want to change the icon, tooltip text, etc, you can call Shell_NotifyIcon with NIM_MODIFY.
* Before your program terminates, call Shell_NotifyIcon with NIM_DELETE to clear your icon from the system tray.
The second parameter (pnid) is a pointer to a TNotifyIconData structure holding the information about the icon.
The TNotifyIconData structure contains the following elements:
cbSize: Passes the size of the NOTIFYICONDATA data type. Data Type: DWORD.
hWnd: Handle of the window used to receive the notification message. Data Type: HWND.
uId: Identifier of the icon in the status area. Data Type: UINT.
uFlags: Array of flags that indicate which of the other members contain valid data. Data Type: UINT. Value: Any combination of the following constants to indicate that the member of this structure is valid and will be used:
NIF_ICON: Passing this flag indicates that the value for the hIcon will be the icon that appears in the taskbar status area.
NIF_MESSAGE: Passing this flag indicates that the uCallBackMessage value will be used as the callback message.
NIF_TIP: Passing this flag indicates that the value of szTip will be used as the ToolTip for the icon in the taskbar status area.
uCallBackMessage: Identifier of the notification message sent to the window that is used to receive the messages. Data Type: UINT.
hIcon: Handle of the icon that is displayed in the taskbar status area. Data Type: HICON.
szTip: String to be used as the ToolTip text. Data Type: Fixed-length AnsiChar 64 bytes long.
{ A component to make it easier to create a system tray icon. Install this component in the Delphi IDE (Component, Install component) and drop it on a form, and the application automatically becomes a tray icon. This means that when the application is minimized, it does not minimize to a normal taskbar icon, but to the little system tray on the side of the taskbar. A popup menu is available from the system tray icon, and your application can process mouse events as the user moves the mouse over the system tray icon, clicks on the icon, etc.
Copyright ? 1996 Tempest Software. All rights reserved. You may use this software in an application without fee or royalty, provided this copyright notice remains intact. }
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