如下两个关于mfc函数的问题，求高手解答

Question

void CSNAKEView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch(nChar)
{……
……}
CView::OnKeyDown(nChar, nRepCnt, nFlags);
}
问题1:参数里的 UINT nRepCnt, UINT nFlags什么意思?
问题2:Switch语句后面的 CView::OnKeyDown(nChar, nRepCnt, nFlags);是什么意思??

Answer 1

参数一：UINT nChar,&nbsp;虚拟键盘码，#define VK_LBUTTON 0x01#define VK_RBUTTON 0x02#define VK_CANCEL 0x03#define VK_MBUTTON 0x04&nbsp;#if(_WIN32_WINNT >= 0x0500)#define VK_XBUTTON1 0x05&nbsp;#define VK_XBUTTON2 0x06&nbsp;#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&nbsp;#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#if(_WIN32_WINNT >= 0x0500)#define VK_PACKET 0xE7#endif#define VK_OEM_RESET 0xE9#define VK_OEM_JUMP 0xEA#define VK_OEM_PA1 0xEB#define VK_OEM_PA2 0xEC#define VK_OEM_PA3 0xED#define VK_OEM_WSCTRL 0xEE#define VK_OEM_CUSEL 0xEF#define VK_OEM_ATTN 0xF0#define VK_OEM_FINISH 0xF1#define VK_OEM_COPY 0xF2#define VK_OEM_AUTO 0xF3#define VK_OEM_ENLW 0xF4#define VK_OEM_BACKTAB 0xF5#define VK_ATTN 0xF6#define VK_CRSEL 0xF7#define VK_EXSEL 0xF8#define VK_EREOF 0xF9#define VK_PLAY 0xFA#define VK_ZOOM 0xFB#define VK_NONAME 0xFC#define VK_PA1 0xFD#define VK_OEM_CLEAR 0xFE参数二：UINT nRepCnt,nRepCnt参数保存了键被重击的次数。参数三：UINT nFlags，值是一个16位的UINT型.各位代表的意义如下:&nbsp;第0-7位:扫描码&nbsp;第8位:扩展键,比如说功能键(F1-12),或者数字区的键&nbsp;第9-10位:没有使用&nbsp;第11-12位:供Windows内部使用&nbsp;第13位:状态描述码(如果键按下时ATL键也是按下的,那么值为1,否则为0)&nbsp;第14位:前一个键的状态(如果是按下的,值为1,否则为0)&nbsp;第15位:变换状态(如果键是正在被按下,值为1,如果是正在放开,值为0)2:是让你不关心而且没有处理的键送给 CSNAKEView的父类函数去处理。

Answer 2

1.nRepCnt 按键的次数，nFlags一个标志，表示各种按键状态（值的对应定义见链接中的表）2.调用基类OnKeyDown方法