Partager via


CWnd::OnKeyUp

The framework calls this member function when a nonsystem key is released.

afx_msg void OnKeyUp(
   UINT nChar,
   UINT nRepCnt,
   UINT nFlags 
);

Parameters

  • nChar
    Specifies the virtual key code of the given key. For a list of of standard virtual key codes, see Winuser.h

  • nRepCnt
    Repeat count (the number of times the keystroke is repeated as a result of the user holding down the key).

  • nFlags
    Specifies the scan code, key-transition code, previous key state, and context code, as shown in the following list:

    Value

    Description

    0–7

    Scan code (OEM-dependent value). Low byte of high-order word.

    8

    Extended key, such as a function key or a key on the numeric keypad (1 if it is an extended key; otherwise 0).

    9–10

    Not used.

    11–12

    Used internally by Windows.

    13

    Context code (1 if the ALT key is held down while the key is pressed; otherwise 0).

    14

    Previous key state (1 if the key is down before the call, 0 if the key is up).

    15

    Transition state (1 if the key is being released, 0 if the key is being pressed).

    For a WM_KEYUP message, the key-transition bit (bit 15) is 1 and the context-code bit (bit 13) is 0.

Remarks

A nonsystem key is a keyboard key that is pressed when the ALT key is not pressed or a keyboard key that is pressed when the CWnd has the input focus.

For IBM Enhanced 101- and 102-key keyboards, enhanced keys are the right ALT and the right 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 slash (/) and ENTER keys in the numeric keypad. Some other keyboards may support the extended-key bit in nFlags.

Notes

This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.

Requirements

Header: afxwin.h

See Also

Concepts

CWnd Class

CWnd Members

Hierarchy Chart

CWnd::OnChar

WM_KEYUP

CWnd::Default

WM_KEYDOWN