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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WM_SYSDEADCHAR
The WM_SYSDEADCHAR message is sent to the window with the keyboard focus when
a WM_SYSKEYDOWN message is translated by the TranslateMessage function. WM_SYSDEADCHAR specifies the character code of a system dead key  that is, a dead key that is pressed while holding down the ALT key.
WM_SYSDEADCHAR
chCharCode = (TCHAR) wParam; // character code
lKeyData = lParam; // key data
Parameters
chCharCode
Value of wParam. Specifies the character code generated by the system dead key that is, a dead key that is pressed while holding down the ALT key.
lKeyData
Value of lParam. Specifies the repeat count, scan code, extended-key flag, context code,
previous key-state flag, and transition-state flag, as shown in the following
table:
Value
| Description
| 0 15
| Specifies the repeat count. The value is the number of times the keystroke is
repeated as a result of the user holding down the key.
| 1623
| 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.
| 2528
| Reserved; do not use.
| 29
| Specifies the context code. The value is 1 if the ALT key is held down while the key is pressed; otherwise, the value is 0.
| 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 1 if the key is being released,
or it is 0 if the key is being pressed.
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Return Values
An application should return zero if it processes this message.
Remarks
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.
See Also
TranslateMessage, WM_DEADCHAR, WM_SYSKEYDOWN
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