WM_SYSCHAR

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This message is posted to the window with the keyboard focus when a WM_SYSKEYDOWNmessage is translated by the TranslateMessagefunction. It specifies the character code of a system character key—that is, a character key that is pressed while the ALT key is down.

WM_SYSCHAR
chCharCode= 
(TCHAR)
wParam; 
lKeyData= lParam;

Parameters

chCharCode

Specifies the character code of the windowmenu key.

lKeyData

Specifies the repeat count, 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.
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.

Return Values

An application should return zero if it processes this message.

Remarks

When the context code is zero, the message can be passed to the TranslateAcceleratorfunction, which will handle it as though it were a standard key message instead of a system character-key message. This enables accelerator keys to be used with the active window even if the active window does not have the keyboard focus.

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; the PRINT SCRN key; the BREAK key; the NUMLOCK key; and the divide (/) and ENTER keys in the numeric keypad. Other keyboards may support the extended-key bit in the lKeyDataparameter.

Requirements

Runs on	Versions	Defined in	Include	Link to
Windows CE OS

Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.