The TTN_NEEDTEXT notification message retrieves text for a tool. This notification message is sent in the form of a WM_NOTIFY message.
TTN_NEEDTEXT idTT = (int) wParam; lpttt = (LPTOOLTIPTEXT) lParam;
No return value.
This notification message is sent to the window specified in the hwnd member of the TOOLINFO structure for the tool. This notification is sent only if the LPSTR_TEXTCALLBACK value is specified when the tool is added to a ToolTip control.
When a TTN_NEEDTEXT notification is received, the application can set or clear the TTF_RTLREADING value in the uFlags member of the TOOLTIPTEXT structure pointed to by lpttt as required. This is the only flag that can be changed during the notification callback.
TOOLINFO, TOOLTIPTEXT, WM_NOTIFY
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