Usage of VC hotkeys and key combinations mfc c ++ hotkey wm_hotkey

The content described below is successfully debugged in the vc6.0 MFC program.

 

[1] use of hotkeys

It mainly uses two API functions: registerhotkey and unregisterhotkey. For details, see msdn. The edit box is used as an example to create cmyedit2, a derived class of cedit.

1) Respond to the wm_hotkey message

Registerhotkey can send wm_hotkey messages to the window. Therefore, wm_hotkey message ing is defined first.

Add afx_msg long onhotkey (wparam, lparam) to the. h file. The specific location is as follows:

 Protected: <br/> // {afx_msg (cmyedit2) <br/> afx_msg void ondestroy (); <br/> afx_msg int oncreate (lpcreatestruct ); <br/> //} afx_msg <br/> afx_msg long onhotkey (wparam, lparam); // manually add <br/> declare_message_map ()

Add on_message (wm_hotkey, onhotkey) to the. cpp file. The specific location is as follows:

Begin_message_map (cmyedit2, cedit) <br/> // {afx_msg_map (cmyedit2) <br/> on_wm_char () <br/> on_wm_destroy () <br/> on_wm_create () <br/> //} afx_msg_map <br/> on_message (wm_hotkey, onhotkey) // manually add <br/> end_message_map ()

Define the response function:

Long cmyedit2: onhotkey (wparam, lparam) <br/>{</P> <p> uint fumodifiers = (uint) loword (lparam ); // key-modifier flags <br/> uint uvirtkey = (uint) hiword (lparam ); // virtual-key code </P> <p> // determines the hotkey responded <br/> If (mod_control = fumodifiers & 'D' = ustmkey) <br/>{< br/> afxmessagebox (_ T ("you pressed the key combination Ctrl + D ")); <br/>}< br/> else if (mod_alt = fumodifiers & 'M' = u1_key) <br/>{< br/> afxmessagebox (_ T ("you pressed the combination key Alt + M ")); <br/>}< br/> else <br/> afxmessagebox (_ T ("you pressed the unknown hotkey"); </P> <p> return 0; <br/>}

 

2) Registration hotkey

Void cmyedit2: Init () <br/>{< br/> // this function can be used in presubclasswindow and oncreate; <br/> // if it is not used in the first two, you can go to cdialog: oninitdialog or <br/> // cview :: use </P> <p> assert (null! = Getsafehwnd ()); </P> <p> // register hotkey <br/> # ifdef _ debug // debug version <br/> int nret = registerhotkey (getsafehwnd (), m_nhotkeyid [0], mod_control, 'D'); // key Ctrl + D <br/> If (! Nret) <br/> afxmessagebox (_ T ("registerhotkey 0 false"); <br/> nret = registerhotkey (getsafehwnd (), m_nhotkeyid [1], mod_alt, 'M'); // The Hot Key Alt + M <br/> If (! Nret) <br/> afxmessagebox (_ T ("registerhotkey 1 false"); <br/> # else // release version <br/> registerhotkey (getsafehwnd (), m_nhotkeyid [0], mod_control, 'D'); // key Ctrl + D <br/> registerhotkey (getsafehwnd (), m_nhotkeyid [1], mod_alt, 'M '); // Hot Key Alt + M <br/> # endif <br/>}

3) unregister hotkey

Void cmyedit2: ondestroy () <br/>{< br/> cedit: ondestroy (); </P> <p> // unregister hotkey <br/> # ifdef _ debug <br/> int nret = unregisterhotkey (getsafehwnd (), m_nhotkeyid [0]); <br/> If (! Nret) <br/> afxmessagebox (_ T ("unregisterhotkey 0 false"); <br/> nret = unregisterhotkey (getsafehwnd (), m_nhotkeyid [1]); <br/> If (! Nret) <br/> afxmessagebox (_ T ("unregisterhotkey 1 false"); <br/> # else <br/> unregisterhotkey (getsafehwnd (), m_nhotkeyid [0]); <br/> unregisterhotkey (getsafehwnd (), m_nhotkeyid [1]); <br/> # endif </P> <p>}

 

Note: The position where Init () is used. Here, the isinit variable (bool value) is used to ensure that the init function is called only once.

Void cmyedit2: presubclasswindow () <br/>{< br/> // initialization <br/> If (! Isinit) <br/>{< br/> Init (); <br/> isinit = true; <br/>}</P> <p> cedit :: presubclasswindow (); <br/>}</P> <p> int cmyedit2: oncreate (maid) <br/>{< br/> If (cedit :: oncreate (lpcreatestruct) =-1) <br/> return-1; </P> <p> // initialization <br/> If (! Isinit) <br/>{< br/> Init (); <br/> isinit = true; <br/>}</P> <p> return 0; <br/>}< br/>

 

[2] (send with code) Send a key combination message

1) Send the wm_hotkey message

Wparam; <br/> lparam; </P> <p> // send the wm_hotkey message and press Ctrl + D. <br/> wparam = 0; <br/> lparam = makelong (mod_control, 'D'); <br/>: sendmessage (heditwnd, wm_hotkey, wparam, lparam );