The TrackMouseEvent function posts messages when the mouse pointer leaves a window or hovers over a window for a specified amount of time.
Syntax
BOOL TrackMouseEvent( LPTRACKMOUSEEVENT lpEventTrack );
Parameters
lpEventTrack [in, out] Pointer to a TRACKMOUSEEVENT structure that contains tracking information.
Return Value
If the function succeeds, the return value is nonzero . If the function fails, return value is zero. To get extended error information, call GetLastError. The function can post the following messages.MessageMeaningWM_NCMOUSEHOVERWindows 98/Me, Windows 2000/XP: The same meaning as WM_MOUSEHOVER except this is for the nonclient area of the window.WM_NCMOUSELEAVEWindows 98/Me, Windows 2000/XP: The same meaning as WM_MOUSELEAVE except this is for the nonclient area of the window.WM_MOUSEHOVERThe mouse hovered over the client area of the window for the period of time specified in a prior call to TrackMouseEvent. Hover tracking stops when this message is generated. The application must call TrackMouseEvent again if it requires further tracking of mouse hover behavior.WM_MOUSELEAVEThe mouse left the client area of the window specified in a prior call to TrackMouseEvent. All tracking requested by TrackMouseEvent is canceled when this message is generated. The application must call TrackMouseEvent when the mouse reenters its window if it requires further tracking of mouse hover behavior.
If the function succeeds, the return value is nonzero .
If the function fails, return value is zero. To get extended error information, call GetLastError.
The function can post the following messages.
Remarks
The mouse pointer is considered to be hovering when it stays within a specified rectangle for a specified period of time. Call SystemParametersInfo. and use the values SPI_GETMOUSEHOVERWIDTH, SPI_GETMOUSEHOVERHEIGHT, and SPI_GETMOUSEHOVERTIME to retrieve the size of the rectangle and the time. Note The _TrackMouseEvent function calls TrackMouseEvent if it exists, otherwise _TrackMouseEvent emulates TrackMouseEvent. The _TrackMouseEvent function is in commctrl.h and is exported by COMCTRL32.DLL.
The mouse pointer is considered to be hovering when it stays within a specified rectangle for a specified period of time. Call SystemParametersInfo. and use the values SPI_GETMOUSEHOVERWIDTH, SPI_GETMOUSEHOVERHEIGHT, and SPI_GETMOUSEHOVERTIME to retrieve the size of the rectangle and the time.
Function Information
Minimum DLL Versionuser32.dllHeaderDeclared in Winuser.h, include Windows.hImport libraryUser32.libMinimum operating systems Windows 98, Windows NT 4.0UnicodeImplemented as Unicode version.
See Also
Mouse Input, SystemParametersInfo, _TrackMouseEvent, TRACKMOUSEEVENT
<DllImport("user32.dll", SetLastError:=True, ExactSpelling:=True)> _ Public Shared Function TrackMouseEvent(ByVal tme As TRACKMOUSEEVENT) As Boolean End Function
[DllImport("user32.dll", SetLastError=true, ExactSpelling=true)] public static extern bool TrackMouseEvent(TRACKMOUSEEVENT tme);