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WM_MBUTTONDOWN

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This message is posted when the user presses the middle mouse button while the cursor is located within the client area of a window. If another window has not captured the mouse, the OS posts the message to the window beneath the cursor. If another window has captured the mouse, the OS posts the message to the window that has captured the mouse.

A window receives this message through the WindowProc function for the window.

WM_MBUTTONDOWN 
  fwKeys = wParam; 
  xPos = LOWORD(lParam); 
  yPos = HIWORD(lParam);

Parameters

  • fwKeys
    Indicates the mouse buttons and keys that the user pressed. The following table shows the possible values, which can be combined.
    Value Description
    MK_CONTROL The user pressed the CTRL key.
    MK_LBUTTON The user pressed the left mouse button.
    MK_MBUTTON The user pressed the middle mouse button.
    MK_RBUTTON The user pressed the right mouse button.
    MK_SHIFT The user pressed the SHIFT key.
  • xPos
    Value of the low-order word of lParam. Specifies the x-coordinate of the pointer, relative to the upper-left corner of the client area.
  • yPos
    Value of the high-order word of lParam. Specifies the y-coordinate of the pointer, relative to the upper-left corner of the client area.

Return Values

An application that processes this message should return zero.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Windows.h.
Link Library: Coredll.lib.

See Also

GetAsyncKeyState | GetCapture | GetKeyState | SetCapture | WindowProc | HIWORD | LOWORD | WM_MBUTTONUP

 Last updated on Wednesday, April 14, 2004

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