Detailed introduction to keyboard and mouse messages in Win32 SDK Basics (13)

1. Keyboard messages

1. Keyboard messages

WM_KEYDOWN - generated when a keyboard key is pressed.

WM_KEYUP - generated when the keyboard key pops up.

WM_SYSKEYDOWN —— Generated when the system key is pressed, such as ALT, F10, etc.

WM_SYSKEUP —— Generated when the system is released

WM_CHAR —— Character message

2. Message parameters:

Key message:

WPARAM - VirtualKey of the key

LPARAM - Key parameters, such as the number of times pressed

WM_CHAR:

WPARAM - Input characters (ASCII encoding)

LPARAM ——Relevant parameters of the button

3. Use of messages:

(1) KEYDOWN can repeat the message, KEYUP can only appear once when the key is released

(2) When TranslateMessage converts the WM_KEYDOWN message, WM_CHAR can be generated for visible characters, but there is no such message for invisible characters.

2. Mouse messages

1. Basic mouse messages

WM_LBUTTONDOWN——The left mouse button is pressed

WM_LBUTTONUP —— The left mouse button bounces up

WM_RBUTTONDOWN ——The right mouse button is pressed

WM_RBUTTONUP — — Right mouse button pops up

WM_MOUSEMOVE ——Mouse move message

1.1 Message parameters

WMPARAM ——The state of other keys, such as Ctrl/Shift, etc.

##LPARAM ——The position of the mouse, the window client area Coordinate System.

LOWORD X coordinate position

HIWORD Y coordinate position

1.2 Use of mouse messages

Generally, mouse press/move up appears in pairs. During mouse movement, a series of WM_MOUSEMOVE messages will be generated according to the movement speed.

2. Double-click the message

WM_LBUTTONDBLICLK——Double-click the left mouse button

WM_RBUTTONDBLICLK——Double-click the right mouse button

2.1 Message parameters

WMPARAM ——The status of other keys, such as Ctrl/Shift, etc.

LPARAM ——Mouse The position, the coordinate system of the window client area.

LOWORD X coordinate position

HIWORD Y coordinate position

You need to be in the registration window when using it When adding the CS_DBLCLS style to the class, the order of message generation:

WM_LBUTTONDOWN

WM_LBUTTONUP

WM_LBUTTONDBLCLK

WM_LBUTTONUP

3. Wheel message

WM_MOUSEWHEEL——Mouse wheel message

3.1 Message Parameter

WMPARAM —— The status of other buttons

HIWORD —— The offset of the scroll wheel, which is a multiple of 120, through the positive and negative poles Indicates the direction of scrolling.

Positive: scroll forward

Negative: scroll backward

LRARAM: Mouse current Position, screen coordinate system:

LOWORD X coordinate position

HIWORD Y coordinate position

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