VC++基础判断键盘消息

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头文件变量声明：

BOOL bShiftdown,bShiftup,bShiftB;

消息事件声明：

afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);afx_msg void OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags);afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);

增加消息映射：

BEGIN_MESSAGE_MAP(CtestnfcView, CView)ON_WM_KEYDOWN()ON_WM_KEYUP()ON_WM_CHAR()// 标准打印命令ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint)ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint)ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CtestnfcView::OnFilePrintPreview)END_MESSAGE_MAP()

按键消息事件的实现：

void CtestnfcView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) {// TODO: Add your message handler code here and/or call defaultif(nChar==VK_SHIFT)//判断Shift键是否被按下{//AfxMessageBox("dd");bShiftdown=TRUE;bShiftup=FALSE;Invalidate(TRUE);//显示信息}CView::OnKeyDown(nChar, nRepCnt, nFlags);}void CtestnfcView::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) {// TODO: Add your message handler code here and/or call defaultif(nChar==VK_SHIFT)//判断Shift键是否被释放{//AfxMessageBox("dd");bShiftup=TRUE;Invalidate(TRUE);//显示信息bShiftdown=FALSE;}CView::OnKeyUp(nChar, nRepCnt, nFlags);}void CtestnfcView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {// TODO: Add your message handler code here and/or call defaultif((nChar==98)||(nChar==66))//判断是否敲击了字符键B键或b键{if(bShiftdown){bShiftB=TRUE;bShiftdown=FALSE;Invalidate(TRUE);//显示信息}}CView::OnChar(nChar, nRepCnt, nFlags);}

界面的重绘：

void CtestnfcView::OnDraw(CDC* pDC){CtestnfcDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);if (!pDoc)return;// TODO: 在此处为本机数据添加绘制代码 if(bShiftdown)//按下了Shift键{pDC->TextOut(20,20,"用户按下了Shift键!");}if(bShiftup)//释放了Shift键{pDC->TextOut(20,20,"用户释放了Shift键!");}if(bShiftB)//同时按下了Shift键和B键{pDC->TextOut(20,20,"用户同时按下Shift键和B键!");bShiftB=FALSE;}}

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VC++基础 判断键盘消息

VC++基础判断键盘消息