VC/MFC 鍵盤消息的截取與響應(yīng)
在MFC(Microsoft Foundation Class)對(duì)響應(yīng)消息進(jìn)行了封裝，
可以通過重載虛函數(shù)PreTranslateMessage()對(duì)所關(guān)心的消息進(jìn)行截取與響應(yīng)：
以下對(duì)截取與響應(yīng)鍵盤 Enter 消息的截取與響應(yīng)
這是對(duì)話框的響應(yīng)鍵盤 Enter 消息方式：
BOOL C**Dlg::PreTranslateMessage(MSG* pMsg)
{
// TODO: 在此添加專用代碼和/或調(diào)用基類
//判斷是否為鍵盤消息
if (WM_KEYFIRST <= pMsg->message && pMsg->message <= WM_KEYLAST)
{
//判斷是否按下鍵盤Enter鍵
if(pMsg->wParam==VK_RETURN)
{
//Do anything what you want to
return TRUE;
}
}
return CDialog::PreTranslateMessage(pMsg);
}
這是View視圖類響應(yīng)鍵盤 Enter 消息的方式：
BOOL C**View::PreTranslateMessage(MSG* pMsg)
{
if (WM_KEYFIRST <= pMsg->message && pMsg->message <= WM_KEYLAST)
{
if(pMsg->wParam==VK_RETURN )
{
//Do anything you want here
return TRUE;
}
}
return CFormView::PreTranslateMessage(pMsg);
}
在上面的代碼中，首先將pMsg->message所表示的消息同WM_KEYFIRST 和WM_KEYLAST比較，確定是鍵盤消息，然后通過消息參數(shù)pMsg->wParam的值來判斷是否是回車鍵（VK_RETURN，虛擬鍵碼可以下面相關(guān)資料中查到）。
常用的Delete鍵的虛擬鍵碼為：VK_DELETE
其他相關(guān)的自己慢慢找吧，呵呵。
#define VK_LBUTTON 0x01
#define VK_RBUTTON 0x02
#define VK_CANCEL 0x03
#define VK_MBUTTON 0x04
#if(_WIN32_WINNT >= 0x0500)
#define VK_XBUTTON1 0x05
#define VK_XBUTTON2 0x06
#endif
#define VK_BACK 0x08
#define VK_TAB 0x09
#define VK_CLEAR 0x0C
#define VK_RETURN 0x0D
#define VK_SHIFT 0x10
#define VK_CONTROL 0x11
#define VK_MENU 0x12
#define VK_PAUSE 0x13
#define VK_CAPITAL 0x14
#define VK_KANA 0x15
#define VK_HANGEUL 0x15
#define VK_HANGUL 0x15
#define VK_JUNJA 0x17
#define VK_FINAL 0x18
#define VK_HANJA 0x19
#define VK_KANJI 0x19
#define VK_ESCAPE 0x1B
#define VK_CONVERT 0x1C
#define VK_NONCONVERT 0x1D
#define VK_ACCEPT 0x1E
#define VK_MODECHANGE 0x1F
#define VK_SPACE 0x20
#define VK_PRIOR 0x21
#define VK_NEXT 0x22
#define VK_END 0x23
#define VK_HOME 0x24
#define VK_LEFT 0x25
#define VK_UP 0x26
#define VK_RIGHT 0x27
#define VK_DOWN 0x28
#define VK_SELECT 0x29
#define VK_PRINT 0x2A
#define VK_EXECUTE 0x2B
#define VK_SNAPSHOT 0x2C
#define VK_INSERT 0x2D
#define VK_DELETE 0x2E
#define VK_HELP 0x2F
#define VK_LWIN 0x5B
#define VK_RWIN 0x5C
#define VK_APPS 0x5D
#define VK_SLEEP 0x5F
#define VK_NUMPAD0 0x60
#define VK_NUMPAD1 0x61
#define VK_NUMPAD2 0x62
#define VK_NUMPAD3 0x63
#define VK_NUMPAD4 0x64
#define VK_NUMPAD5 0x65
#define VK_NUMPAD6 0x66
#define VK_NUMPAD7 0x67
#define VK_NUMPAD8 0x68
#define VK_NUMPAD9 0x69
#define VK_MULTIPLY 0x6A
#define VK_ADD 0x6B
#define VK_SEPARATOR 0x6C
#define VK_SUBTRACT 0x6D
#define VK_DECIMAL 0x6E
#define VK_DIVIDE 0x6F
#define VK_F1 0x70
#define VK_F2 0x71
#define VK_F3 0x72
#define VK_F4 0x73
#define VK_F5 0x74
#define VK_F6 0x75
#define VK_F7 0x76
#define VK_F8 0x77
#define VK_F9 0x78
#define VK_F10 0x79
#define VK_F11 0x7A
#define VK_F12 0x7B
#define VK_F13 0x7C
#define VK_F14 0x7D
#define VK_F15 0x7E
#define VK_F16 0x7F
#define VK_F17 0x80
#define VK_F18 0x81
#define VK_F19 0x82
#define VK_F20 0x83
#define VK_F21 0x84
#define VK_F22 0x85
#define VK_F23 0x86
#define VK_F24 0x87
#define VK_NUMLOCK 0x90
#define VK_SCROLL 0x91
#define VK_OEM_NEC_EQUAL 0x92 // '=' key on numpad
#define VK_OEM_FJ_JISHO 0x92 // 'Dictionary' key
#define VK_OEM_FJ_MASSHOU 0x93 // 'Unregister word' key
#define VK_OEM_FJ_TOUROKU 0x94 // 'Register word' key
#define VK_OEM_FJ_LOYA 0x95 // 'Left OYAYUBI' key
#define VK_OEM_FJ_ROYA 0x96 // 'Right OYAYUBI' key
#define VK_LSHIFT 0xA0
#define VK_RSHIFT 0xA1
#define VK_LCONTROL 0xA2
#define VK_RCONTROL 0xA3
#define VK_LMENU 0xA4
#define VK_RMENU 0xA5
#if(_WIN32_WINNT >= 0x0500)
#define VK_BROWSER_BACK 0xA6
#define VK_BROWSER_FORWARD 0xA7
#define VK_BROWSER_REFRESH 0xA8
#define VK_BROWSER_STOP 0xA9
#define VK_BROWSER_SEARCH 0xAA
#define VK_BROWSER_FAVORITES 0xAB
#define VK_BROWSER_HOME 0xAC
#define VK_VOLUME_MUTE 0xAD
#define VK_VOLUME_DOWN 0xAE
#define VK_VOLUME_UP 0xAF
#define VK_MEDIA_NEXT_TRACK 0xB0
#define VK_MEDIA_PREV_TRACK 0xB1
#define VK_MEDIA_STOP 0xB2
#define VK_MEDIA_PLAY_PAUSE 0xB3
#define VK_LAUNCH_MAIL 0xB4
#define VK_LAUNCH_MEDIA_SELECT 0xB5
#define VK_LAUNCH_APP1 0xB6
#define VK_LAUNCH_APP2 0xB7
#endif
#define VK_OEM_1 0xBA // ';:' for US
#define VK_OEM_PLUS 0xBB // '+' any country
#define VK_OEM_COMMA 0xBC // ',' any country
#define VK_OEM_MINUS 0xBD // '-' any country
#define VK_OEM_PERIOD 0xBE // '.' any country
#define VK_OEM_2 0xBF // '/?' for US
#define VK_OEM_3 0xC0 // '`~' for US
#define VK_OEM_4 0xDB // '[{' for US
#define VK_OEM_5 0xDC // '\|' for US
#define VK_OEM_6 0xDD // ']}' for US
#define VK_OEM_7 0xDE // ''"' for US
#define VK_OEM_8 0xDF
#define VK_OEM_AX 0xE1 // 'AX' key on Japanese AX kbd
#define VK_OEM_102 0xE2 // "<>" or "\|" on RT 102-key kbd.
#define VK_ICO_HELP 0xE3 // Help key on ICO
#define VK_ICO_00 0xE4 // 00 key on ICO
#if(WINVER >= 0x0400)
#define VK_PROCESSKEY 0xE5
#endif
#define VK_ICO_CLEAR 0xE6
在MFC Active控件中重寫handle事件，接受鍵盤輸入，作出相應(yīng)的處理，但是當(dāng)控件在C#或者VB表單上被調(diào)用時(shí)，handle事件只能接受到數(shù)字0~9和字母鍵的輸入，因?yàn)檫@些鍵值沒有改變，而其它鍵值在類Win32KeyboardMap所作的映射在此時(shí)失效（失效的原因？）。因此需要在控件的OnKeyDown事件中獲取鍵值，然后再用函數(shù)keyPress重新作映射。
而實(shí)際上，讓人折騰的是，OnKeyDown居然不能夠獲取到鍵盤上那四個(gè)至關(guān)重要的方向鍵輸入，對(duì)這四個(gè)鍵的輸入無動(dòng)于衷，查找了大半天終于在http://support.microsoft.com/kb/180402/zh-tw在找到原因，因此最終解決這個(gè)問題是在控件中添加PreTranslateMessage(MSG* pMsg)消息，函數(shù)實(shí)現(xiàn)大致如下
BOOL CTunnelComponentCtrl::PreTranslateMessage(MSG* pMsg)
{
// TODO: 在此添加專用代碼和/或調(diào)用基類
if(InTravelMode())
{
switch(pMsg->message)
{
case WM_KEYDOWN:
{
switch(pMsg->wParam)
{
case VK_DOWN:
case VK_UP:
{ m_Viewer->getEventQueue()->keyPress((osgGA::GUIEventAdapter::KeySymbol)pMsg->wParam);
break;
}
default:
break;
}
break;
}
default:
break;
}
}
return COleControl::PreTranslateMessage(pMsg);
}
