Keyboard Hooking in Windows CE 6.0

最新推荐文章于 2018-01-29 15:39:15 发布

转载最新推荐文章于 2018-01-29 15:39:15 发布 · 684 阅读

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#keyboard #windows #hook #callback #user #wince

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本文介绍如何在WinCE 6.0中实现全局键盘事件监听。通过使用SetWindowsHookEx与UnhookWindowsHookEx函数，并结合DLL进行钩子回调处理，文章详细展示了捕获F1至F4按键的具体实现过程。

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If you want to monitor system wide keyboard events from an application, then we need to use keyboard hooking using the SetWindowsHookEx & UnhookWindowsHookEx functions. Since we need a system wide hook, we need to place the callback functions in a DLL.




typedef struct {
 DWORD vkCode;
 DWORD scanCode;
 DWORD flags;
 DWORD time;
 ULONG_PTR dwExtraInfo;
} KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;
.....

VOID InitHook ()
{
 .....
 SetWindowsHookEx(WH_KEYBOARD_LL,hookproc,hinstance,NULL);
 .....
}
....
HOOKDLL_API LRESULT CALLBACK hookproc(int ncode,WPARAM wparam,LPARAM lparam)
{
UINT uMsg = 0;
if(ncode>=0)
{
   if((lparam & 0x80000000) == 0x00000000)//Check whether key was pressed(not released).
   {
      switch((((KBDLLHOOKSTRUCT*)lparam)->vkCode))
      {
         case VK_F1:
            RETAILMSG(1,(TEXT("TRAPPED, F1/r/n")));
            uMsg = WM_USER+755;
            break;

         case VK_F2:
            RETAILMSG(1,(TEXT("TRAPPED, F2/r/n")));
            uMsg = WM_USER+756;
            break;

         case VK_F3:
            RETAILMSG(1,(TEXT("TRAPPED, F3/r/n")));
            uMsg = WM_USER+757;
            break;

         case VK_F4:
            RETAILMSG(1,(TEXT("TRAPPED, F4/r/n")));
            uMsg = WM_USER+758;
            break;
      }

   }
}
return ( CallNextHookEx(hook,ncode,wparam,lparam) );//pass control to next hook in the hook chain.
}

But in Wince 6.0, these APIs have been removed, but is still present in coredll. Hence, they can be accessed using LoadLibrary and GetProcAddress functions.

N.B: Special Thanks Prathamesh S Kulkarni on his article on keyboard hooking in code project.