WM_CONTEXTMENU Notification

The WM_CONTEXTMENU message notifies a window that the user clicked the right mouse button (right-clicked) in the window.

Syntax

    WM_CONTEXTMENU

        WPARAM wParam
        LPARAM lParam;

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Introduction 

WM_CONTEXTMENU is a notification message used in Windows OS of old versions to add items to Windows Explorer context (right-click) menu. As you understand, because this notification message is used only for Windows 95 / Windows 98 (not on XP, Vista, x64 - 64-bit Windows), to add items to Windows Explorer Shell context menu you should use, according to Microsoft guidelines, appropriate .Net component - Windows Explorer Context Menu. Explorer Context Menu - is a .Net component that will add entries of all types to Windows Explorer context (right-click) menus.

Parameters

    wParam
        Handle to the window in which the user right-clicked the mouse. This can be a child window of the window receiving the message. For more information about processing this message, see the Remarks section.
    lParam
        The low-order word specifies the horizontal position of the cursor, in screen coordinates, at the time of the mouse click.

        The high-order word specifies the vertical position of the cursor, in screen coordinates, at the time of the mouse click.

Return Value

    No return value.

Remarks

    A window can process this message by displaying a shortcut menu using the TrackPopupMenu or TrackPopupMenuEx functions. To obtain the horizontal and vertical positions, use the following code.
    Copy Code

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

    If a window does not display a shortcut menu it should pass this message to the DefWindowProc function. If a window is a child window, DefWindowProc sends the message to the parent. Otherwise, DefWindowProc displays a default shortcut menu if the specified position is in the window's caption.

    DefWindowProc generates the WM_CONTEXTMENU message when it processes the WM_RBUTTONUP or WM_NCRBUTTONUP message or when the user types SHIFT+F10. The WM_CONTEXTMENU message is also generated when the user presses and releases the VK_APPS key.

    If the context menu is generated from the keyboard—for example, if the user types SHIFT+F10—then the x- and y-coordinates are -1 and the application should display the context menu at the location of the current selection rather than at (xPos, yPos).

Notification Requirements

    Minimum DLL Version    None
    Header    Declared in Winuser.h, include Windows.h
    Minimum operating systems    Windows 95, Windows NT 3.51