Windows message mouse

Indicates whether various virtual keys are down. This parameter can be one or more of the following values. The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. The high-order word specifies the y-coordinate of the cursor. As noted above, the x-coordinate is in the low-order short of the return value; the y-coordinate is in the high-order short both represent signed values because they can take negative values on systems with multiple monitors.

Answered by:. Archived Forums. Also discuss all the other Microsoft libraries that are built on or extend the. Sign in to vote. How can i use keyboard events or mouse move events to be called using timers in C code?

In other words, likewise we can use timers in unmanaged code to send messages , how can this be achieved in. Wednesday, August 29, AM. Code Snippet. Wednesday, August 29, PM. Use a timer and SendKeys. SendKeys can't help, those keystrokes go to the window with the focus. First thing you'll have to do is find the app's main window handle, Process. The lParam parameter of the message specifies a handle to the window that is gaining the mouse capture.

Only the foreground window can capture mouse input. When a background window attempts to capture mouse input, it receives messages only for mouse events that occur when the cursor hot spot is within the visible portion of the window. Capturing mouse input is useful if a window must receive all mouse input, even when the cursor moves outside the window.

For example, an application typically tracks the cursor position after a mouse button down event, following the cursor until a mouse button up event occurs. If an application has not captured mouse input and the user releases the mouse button outside the window, the window does not receive the button-up message.

A thread can use the GetCapture function to determine whether one of its windows has captured the mouse. If one of the thread's windows has captured the mouse, GetCapture retrieves a handle to the window. The Mouse ClickLock accessibility feature enables a user lock down the primary mouse button after a single click. To an application, the button still appears to be pressed down. To unlock the button, an application can send any mouse message or the user can click any mouse button.

This feature lets a user do complex mouse combinations more simply. For example, those with certain physical limitations can highlight text, drag objects, or open menus more easily. For more information, see the following flags and the Remarks in SystemParametersInfo :. Although the mouse is an important input device for applications, not every user necessarily has a mouse.

Windows supports a mouse having up to three buttons. On a three-button mouse, the buttons are designated as the left, middle, and right buttons. Messages and named constants related to the mouse buttons use the letters L, M, and R to identify the buttons. The button on a single-button mouse is considered to be the left button.

Although Windows supports a mouse with multiple buttons, most applications use the left button primarily and the others minimally, if at all. Applications can also support a mouse wheel.

The mouse wheel can be pressed or rotated. When the mouse wheel is pressed, it acts as the middle third button, sending normal middle button messages to your application. When it is rotated, a wheel message is sent to your application. For more information, see The Mouse Wheel section. Applications can support application-command buttons. These buttons, called X buttons, are designed to allow easier access to an Internet browser, electronic mail, and media services.

To configure the mouse for a left-handed user, the application can use the SwapMouseButton function to reverse the meaning of the left and right mouse buttons.

Note, however, that the mouse is a shared resource, so reversing the meaning of the buttons affects all applications. Windows supports a mouse with five buttons. There is support for the keyboards that have extra keys for browser functions, media functions, application launching, and power management. The mouse generates an input event when the user moves the mouse, or presses or releases a mouse button. The system converts mouse input events into messages and posts them to the appropriate thread's message queue.

When mouse messages are posted faster than a thread can process them, the system discards all but the most recent mouse message. A window receives a mouse message when a mouse event occurs while the cursor is within the borders of the window, or when the window has captured the mouse. Mouse messages are divided into two groups: client area messages and nonclient area messages. Typically, an application processes client area messages and ignores nonclient area messages. A window receives a client area mouse message when a mouse event occurs within the window's client area.

It posts one of the following messages when the user presses or releases a mouse button while the cursor is within the client area. In addition, an application can call the TrackMouseEvent function to have the system send two other messages. The lParam parameter of a client area mouse message indicates the position of the cursor hot spot.