VC/MFC 键盘消息的截取与响应

http://hi.baidu.com/ruwind2010/blog/item/654e10d36563bc83a0ec9cbd.html



在MFC(Microsoft Foundation Class)对响应消息进行了封装，

可以通过重载虚函数PreTranslateMessage()对所关心的消息进行截取与响应：

以下对截取与响应键盘 Enter 消息的截取与响应

这是对话框的响应键盘 Enter 消息方式：

BOOL C**Dlg::PreTranslateMessage(MSG* pMsg)

{

// TODO: 在此添加专用代码和/或调用基类

//判断是否为键盘消息

if (WM_KEYFIRST <= pMsg->message && pMsg->message <= WM_KEYLAST)

{

//判断是否按下键盘Enter键

if(pMsg->wParam==VK_RETURN)

{

//Do anything what you want to

return TRUE;

}

}

return CDialog::PreTranslateMessage(pMsg);

}

这是View视图类响应键盘 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);

}

　　在上面的代码中，首先将pMsg->message所表示的消息同WM_KEYFIRST 和WM_KEYLAST比较，确定是键盘消息，然后通过消息参数pMsg->wParam的值来判断是否是回车键（VK_RETURN，虚拟键码可以下面相关资料中查到）。

常用的Delete键的虚拟键码为：VK_DELETE

其他相关的自己慢慢找吧，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控件中重写handle事件，接受键盘输入，作出相应的处理，但是当控件在C#或者VB表单上被调用时，handle事件只能接受到数字0~9和字母键的输入，因为这些键值没有改变，而其它键值在类Win32KeyboardMap所作的映射在此时失效（失效的原因？）。因此需要在控件的OnKeyDown事件中获取键值，然后再用函数keyPress重新作映射。

而实际上，让人折腾的是，OnKeyDown居然不能够获取到键盘上那四个至关重要的方向键输入，对这四个键的输入无动于衷，查找了大半天终于在http://support.microsoft.com/kb/180402/zh-tw在找到原因，因此最终解决这个问题是在控件中添加PreTranslateMessage(MSG*
pMsg)消息，函数实现大致如下

BOOL
CTunnelComponentCtrl::PreTranslateMessage(MSG*
pMsg)
{

// TODO: 在此添加专用代码和/或调用基类


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);
}