The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed.
WM_KEYDOWN nVirtKey = (int) wParam; // virtual-key code lKeyData = lParam; // key data
Value |
Description |
0-15 |
Specifies the repeat count for the current message. The value is the number of times the keystroke is auto-repeated as a result of the user holding down the key. If the keystroke is held long enough, multiple messages are sent. However, the repeat count is not cumulative. |
16-23 |
Specifies the scan code. The value depends on the original equipment manufacturer (OEM). |
24 |
Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0. |
25-28 |
Reserved; do not use. |
29 |
Specifies the context code. The value is always 0 for a WM_KEYDOWN message. |
30 |
Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is 0 if the key is up. |
31 |
Specifies the transition state. The value is always 0 for a WM_KEYDOWN message. |
An application should return zero if it processes this message.
If the F10 key is pressed, the DefWindowProc function sets an internal flag. When DefWindowProc receives the WM_KEYUP message, the function checks whether the internal flag is set and, if so, sends a WM_SYSCOMMAND message to the top-level window. The wParam parameter of the message is set to SC_KEYMENU.
Because of the autorepeat feature, more than one WM_KEYDOWN message may be posted before a WM_KEYUP message is posted. The previous key state (bit 30) can be used to determine whether the WM_KEYDOWN message indicates the first down transition or a repeated down transition.
For enhanced 101- and 102-key keyboards, extended keys are the right ALT and CTRL keys on the main section of the keyboard; the INS, DEL, HOME, END, PAGE UP, PAGE DOWN and arrow keys in the clusters to the left of the numeric keypad; and the divide (/) and ENTER keys in the numeric keypad. Other keyboards may support the extended-key bit in the lKeyData parameter.
DefWindowProc, WM_CHAR, WM_KEYUP, WM_SYSCOMMAND
file: /Techref/os/win/api/win32/mess/src/msg25_2.htm, 4KB, , updated: 2002/11/1 19:06, local time: 2024/9/1 08:46,
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