C++ Keypress

wcgan86

Hi all,

I am newbie in C++, i have a project to check the stuck key of keyboard using VC++ MFC Dialog. Only one key can be press at same time.

example:
I pressed and hold 'a' and then press 'b'. It should prompt out an error message regarding there was more than 1 key pressed.

Below is my coding, i only able to detect a key pressed. If the 'a' key haven't release, 'b' key pressed, it will go in the sub-program and display 'b' key pressed.

What pragrameter i should using in MFC library to check there is more than 1 key pressed?

Thanks.

1. 
   
2. 
   
3. BOOL Test_0Dlg::PreTranslateMessage(MSG* pMsg)
   
4. {
   
5. // TODO: Add your specialized code here and/or call the base class
   
6. MSG* msg=(MSG*)pMsg;
   
7. if(pMsg->message==WM_KEYDOWN)
   
8. {
   
9. // sub-program
   
10. }
    
11. return 0;
    
12. }
    

复制代码

wcgan86

I able to check the key status using 'GetKeyboardState'.

thanks a lot.