Are You Having Trouble Hovering Over A Win32 Button?

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    In some cases, your computer may display an error code indicating that the win32 button is floating. This problem can be caused by a number of reasons.

    I created a C ++ project using Winapi to design some kind of window with a button and I want to change the text with the button when it actually moves with the mouse. For example, replace “Press me” with “Press me NOW!” When the mouse pointer hovers over it. I tried to search, but found no good options. Noticed


    that when the user navigates, a WM_NOTIFY message will be received, but I can’t promise that it was triggered by the mouseover process. I found that I could specifically use TrackMouseEvent to detect hover, but it is limited to any time period and I really want to take an action every minute the user hovers over the button.

      HWND Button = CreateWindow ("BUTTON", "Press me",        WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON | BS_NOTTIFY,        20, 240, 120, 20,        hwnd, (HMENU) 101, NULL, NULL); 

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  •   LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)    edit (message)        Case WM_NOTIFY:            // ??? This is where I get a message every time I hover over the button.        case WM_CREATE: // When Creating Windows            // ...        case WM_COMMAND: // Issuecommand execution            // ...        Pause;        Test // Form wm_destroy: destroyed            MessageQuitter (0);        Pause;            return DefWindowProc (hwnd, MSG, wParam, lParam); 

    Dispatched in a separate window on hover, indicating the amount of time it took for the previous TrackMouseEvent call in the client area of ​​the window.

      #define WM_MOUSEHOVER 0x02A1 



    Indicates whether many virtual keys are inactive. The parameters of this approach can be one or more for the following values.

    value Value
    The CTRL key was pressed.
    The left mouse button was pressed.
    The middle mouse button was pressed.
    The mouse with the fountain button was pressed.


    key pressed.
    First button

    0x0020 X is usually at the bottom.
    The second


    X button is below.


    The period of the least significant bit indicates the x coordinate of the entire cursor. This should be successfully aligned with the upper left corner of the perspective area.

    A higher-order word specifies any y-coordinate of the cursor. It works relative to the top left corner of the client area.



    The hangup complex stops when WM_MOUSEHOVER is generated. The application should call TrackMouseEvent if additional tracking of mouse hover behavior is required in the future.

    Use the following code and get the horizontal and vertical position:

      xPos = GET_X_LPARAM (lParam);yPos = GET_Y_LPARAM (lParam); 

    As stated above, the x coordinate is used to determine the smallest value for the tax return; The y-coordinate is primarily a high-order short order (both represent signed prices as they can take negative ratings in systems with multiplemonitors). The return value of the if is assigned to a variable. You can use the user MAKEPOINTS macro to get a robust POINTS structure from the return value. You can also use the GET_X_LPARAM macro and even GET_Y_LPARAM to retrieve the z-y coordinate or.


    requirement value
    Minimum Supported Client Windows 2000 Professional [Desktop Only]
    Minimum Supported Server Applications Windows servers of the late 90s [desktop applications only]
    Winuser.h (including Windowsx.h)

    See Also









    Mouse input

    Other Resources



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    win32 button hover

    Do not include LOWORD macrosor HIWORD to locate the x and y coordinates associated with the cursor position, since these macros all return incorrect results on systems that have multiple monitors. Systems with multiple clocks can have x- and negative matches, y- and LOWORD and HIWORD stop coordinates as unsigned values.

    win32 button hover

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