Pressing Ctrl will cause several key press messages

​ ​ He Zhidan ​​​

（ One ）, Create a new single document project CtrlEg.
（ Two ）, by CCtrlEgView Of WM_KEYDOWN News and WM_KEYUP Message add response function . The specific code is as follows ：

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       void 
       
       CCtrlEgView::
       
       OnKeyDown(
       
       UINT 
       
       nChar, 
       
       UINT 
       
       nRepCnt, 
       
       UINT 
       
       nFlags) 
       
       
{
       
       
 {
       
       
  
       
       CString 
       
       strMess ;
       
       
  
       
       strMess.
       
       Format(
       
       "CCtrlEgView::OnKeyDown nChar = %d nFlags = %x/n",
       
       nChar,
       
       nFlags);
       
       
  
       
       TRACE(
       
       strMess);
       
       
 }
       
       
 
       
       CView::
       
       OnKeyDown(
       
       nChar, 
       
       nRepCnt, 
       
       nFlags);
       
       
}
       
       void 
       
       CCtrlEgView::
       
       OnKeyUp(
       
       UINT 
       
       nChar, 
       
       UINT 
       
       nRepCnt, 
       
       UINT 
       
       nFlags) 
       
       
{
       
       
 {
       
       
  
       
       CString 
       
       strMess ;
       
       
  
       
       strMess.
       
       Format(
       
       "CCtrlEgView::OnKeyUp nChar = %d nFlags = %x/n",
       
       nChar,
       
       nFlags);
       
       
  
       
       TRACE(
       
       strMess);
       
       
 } 
       
       
 
       
       CView::
       
       OnKeyUp(
       
       nChar, 
       
       nRepCnt, 
       
       nFlags);
       
       
}
      
      
      
      

       
       
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（ 3、 ... and ） Press only Ctrl key , give the result as follows ：
CCtrlEgView::OnKeyDown nChar = 17 nFlags = 1d
CCtrlEgView::OnKeyUp   nChar = 17 nFlags = c01d
（ Four ） Press Ctrl+v, give the result as follows ：
CCtrlEgView::OnKeyDown nChar = 17 nFlags = 1d
CCtrlEgView::OnKeyUp   nChar = 17 nFlags = c01d
CCtrlEgView::OnKeyUp   nChar = 86 nFlags = c02f
（ 5、 ... and ）, Delete “ Paste ” Shortcut keys for commands , The specific operation is from the shortcut key resource IDR_MAINFRAME Delete item ID_EDIT_PASTE. Press again Ctrl+v key , give the result as follows ：
CCtrlEgView::OnKeyDown nChar = 17 nFlags = 1d
CCtrlEgView::OnKeyDown nChar = 86 nFlags = 2f
CCtrlEgView::OnKeyUp   nChar = 17 nFlags = c01d
CCtrlEgView::OnKeyUp   nChar = 86 nFlags = c02f

attach ：
#define VK_CONTROL        0x11
VK_0 thru VK_9 are the same as ASCII '0' thru '9' (0x30 - 0x39)
VK_A thru VK_Z are the same as ASCII 'A' thru 'Z' (0x41 - 0x5A)