vc 判断哪个按键 被按下 消息 按键 状态

 

测试Numlock 是否是亮的

环境控制台程序；

#include "stdafx.h"
#include <stdio.h>
#include <conio.h>
#include <windows.h>

bool CrnGetNumLockState();

int _tmain(int argc, _TCHAR* argv[])
{
if(CrnGetNumLockState())
   printf("NUM-Lock is light ");
else
   printf("Num-Lock is light-off ");
getch();
return 0;
}

bool CrnGetNumLockState()
{
    BYTE btKeyState[256];
    GetKeyboardState((LPBYTE)&btKeyState);

    return btKeyState[VK_NUMLOCK] & 1;
}

判断哪个按键被按下

MFC

BOOL CDemoDlg::PreTranslateMessage(MSG* pMsg)
{
// TODO: 在此添加专用代码和/或调用基类
// 假如截获键盘按下消息，就分析按下的哪个键，然后给相应的按钮发送消息

if(pMsg->message==WM_KEYDOWN)
{
   UINT iKey=(UINT)pMsg->wParam;
   switch(iKey)
   {
   case VK_NUMPAD0:

    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "0");
     CString key = "VK_NUMPAD0";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD1:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "1");
     CString key = "VK_NUMPAD1";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD2:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "2");
     CString key = "VK_NUMPAD2";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD3:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "3");
     CString key = "VK_NUMPAD3";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD4:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "4");
     CString key = "VK_NUMPAD4";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD5:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "5");
     CString key = "VK_NUMPAD5";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD6:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "6");
     CString key = "VK_NUMPAD6";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD7:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "7");
     CString key = "VK_NUMPAD7";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD8:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "8");
     CString key = "VK_NUMPAD8";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;
   case VK_NUMPAD9:
    {
     HWND hwnd = ::GetDlgItem(m_hWnd,IDC_EDIT_IN);

     ::SetWindowText(hwnd, "9");
     CString key = "VK_NUMPAD9";
     KeyRun(key);
     ::SetFocus(m_hWnd);
    }
    break;

   default:
    break;
   }
}
return CDialog::PreTranslateMessage(pMsg);
}