Keybd_event with third party Virtual Key and WM_KEYDOWN

Question

Hi All,
I want to use keybd_event() to send this third party virtual key called VK_OEM_CLR or 0xF5 to other application.
Third party header file defined:
#define VK_OEM_CLR 0xF5
The application that sends the key:
keybd_event(VK_OEM_CLR , 0, KEYEVENTF_EXTENDEDKEY, 0);//try this, but other application does not receive WM_KEYDOWN
keybd_event(0xF5 , 0, KEYEVENTF_EXTENDEDKEY, 0);//try this, but other application does not receive WM_KEYDOWN
The other application that will receive the sending key:
LRESULT CALLBACK LLKbdProc(int nCode, WPARAM wParam, LPARAM lParam);
HHOOK kbdhk;
int quit = 0;
HINSTANCE m_hHookApiDLL = NULL;
typedef LRESULT (CALLBACK* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);
typedef HHOOK (__stdcall *SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);
typedef LRESULT (__cdecl *CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);
typedef LRESULT (__cdecl *UnhookWindowsHookEx)(HHOOK);
static SetWindowsHookExW m_pfSetWindowsHook;
static CallNextHookEx m_pfCallNextHook;
#define WH_KEYBOARD_LL 20
typedef struct {
DWORD vkCode;
DWORD scanCode;
DWORD flags;
DWORD time;
ULONG_PTR dwExtraInfo;
} KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;
void Dbg( TCHAR * lpszFormat, ... )
TCHAR szOutput[1024];
TCHAR * pOutput = szOutput;
va_list v1;
DWORD dwSize;
// Now do the normal printf stuff...
va_start( v1, lpszFormat );
dwSize = ::wvsprintf( pOutput, lpszFormat, v1 );
va_end( v1 );
OutputDebugString(szOutput);
_tprintf(szOutput);
LRESULT CALLBACK LLKbdProc(int nCode, WPARAM wParam, LPARAM lParam)
KBDLLHOOKSTRUCT *pKeyBoard = (KBDLLHOOKSTRUCT *)lParam;
switch( pKeyBoard->vkCode )
case 245://VK_OEM_CLR,0xf5,245
switch(lParam)
case WM_KEYDOWN:
Dbg(_T("receives VK_OEM_CLR, hex 0xf5, decimal 245 on WM_KEYDOWN\r\n"));
return 1;
case WM_KEYUP:
Dbg(_T("receives VK_OEM_CLR, hex 0xf5, decimal 245 on WM_KEYUP\r\n"));
return 1;
default:
Dbg(_T("receives VK_OEM_CLR, hex 0xf5, decimal 245 \r\n"));
break;
return 1;
break;
default: // no processing on this key
Dbg(_T("switch-case: Unknown key\r\n"));
return m_pfCallNextHook( NULL, nCode, wParam, lParam );
return 0;
int main()
m_hHookApiDLL = LoadLibrary(L"coredll.dll");
if(m_hHookApiDLL != NULL)
HINSTANCE appInstance = GetModuleHandle(NULL);
m_pfSetWindowsHook = (SetWindowsHookExW)GetProcAddress(m_hHookApiDLL,L"SetWindowsHookExW");
kbdhk = m_pfSetWindowsHook(WH_KEYBOARD_LL, LLKbdProc, NULL, 0);
if (!kbdhk)
Dbg(_T("WH_KEYBOARD_LL FAILED.\r\n"));
return -2;
//Dbg(_T("Message Pump... Listening...\r\n"));
MSG msg;
while(GetMessage(&msg, NULL, 0, 0) > 0)
if (quit) break;
TranslateMessage(&msg);
DispatchMessage(&msg);
return 0;
The application that receives the key, always catch the virtual key for VK_OEM_CLEAR, but there is no WM_KEYDOWN.  Am I doing something wrong?

Answer 1

That is it.. Thank you so much.  other cases I use wParam,
but overlook for this case.