c++ - Disable annoying sound when handling syskeydown message -


hi have written own custom control overriding mfc cedit. needed override sys_key_up , sys_key_down. each time control handles these message annoying sound heard if input invalid or something. knwo generates sound , how disable it.

upd code 

// cshotcutedit  class cshortcutedit : public cedit {     declare_dynamic(cshortcutedit)  public:     cshortcutedit();     virtual ~cshortcutedit();  protected:     declare_message_map()      afx_msg uint ongetdlgcode();      afx_msg void onkeydown(uint nchar, uint nrepcnt, uint nflags);      afx_msg void onsyskeydown(uint nchar, uint nrepcnt, uint nflags);      afx_msg void onsyskeyup(uint nchar, uint nrepcnt, uint nflags);      afx_msg void onkeyup(uint nchar, uint nrepcnt, uint nflags);      virtual bool pretranslatemessage(msg* pmsg);      virtual void dodataexchange(cdataexchange* pdx);      virtual void presubclasswindow();      virtual void onchar(uint uichar, uint uicount, uint uiflags);      // ... other members   };  // shotcutedit.cpp : implementation file //  #include "stdafx.h" #include "gridplus.h" #include "shortcutedit.h"   // cshotcutedit  implement_dynamic(cshortcutedit, cedit)  cshortcutedit::cshortcutedit() {  }  cshortcutedit::~cshortcutedit() {  }   begin_message_map(cshortcutedit, cedit)     on_wm_getdlgcode()     on_wm_keydown()     on_wm_syskeydown()     on_wm_syskeyup()     on_wm_keyup()     on_wm_char() end_message_map()  uint cshortcutedit::ongetdlgcode() {      return dlgc_wantarrows | dlgc_wantallkeys | dlgc_wantchars; }  void cshortcutedit::dodataexchange(cdataexchange* pdx) {     cedit::dodataexchange(pdx); }  bool cshortcutedit::pretranslatemessage(msg* pmsg) {     return cedit::pretranslatemessage(pmsg); }  void cshortcutedit::onsyskeyup(uint nchar, uint nrepcnt, uint nflags) {  }  void cshortcutedit::onsyskeydown(uint nchar, uint nrepcnt, uint nflags) {     // ... check alt or f10 , translate string; }  void cshortcutedit::onkeydown(uint nchar, uint nrepcnt, uint nflags) {     // .. check ctrl shift , translate string  }  void cshortcutedit::onkeyup(uint nchar, uint nrepcnt, uint nflags) {     setwindowtext(l"the desired shortcut is..."); // should print "alt+f10" example }  void cshortcutedit::onchar(uint uichar, uint uicount, uint uiflags) {  }   void cshortcutedit::presubclasswindow() {     hidecaret();     cedit::presubclasswindow(); }  // cshotcutedit message handlers

that's default behavior of edit control. notepad same thing in response alt+a key.

to avoid sound, overload pretranslatemessage

bool cshortcutedit::pretranslatemessage(msg* pmsg) {     if (pmsg->message == wm_syskeydown)     {         uint nflags = hiword(pmsg->lparam);         int nchar = (int)pmsg->wparam;          if (nchar == 'a' && nflags & kf_altdown)         {             trace("alt+a key\n");             return 1;         }     }      return cedit::pretranslatemessage(pmsg); }

also, if don't want edit control don't use one, rather using edit control , breaking every input.

you need chotkeyctrl


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