C / C++ / MFC

<br />
#define ID_CMD_KEYPRESSED	WM_USER+200<br />
// Globals for this module <br />
HWND     ghWndMain;      // Handle to main window -- used to post msgs<br />
static HHOOK    hHook;          // A handle to our installed hook <br />
static BOOL     bHookInstalled; // TRUE if hook has been installed <br />
<br />
HINSTANCE ghDLLInst; <br />
SYSTEMHOOK_API LRESULT CALLBACK KeyboardProc(<br />
	int code,       // hook code<br />
	WPARAM wParam,  // virtual-key code<br />
	LPARAM lParam)  // keystroke-message information<br />
{<br />
	if (code>=0) <br />
	{<br />
		if (HIWORD(lParam) & 0x8000) <br />
		{<br />
			HWND h=::FindWindow(NULL,"WinScheduler");<br />
			PostMessage(h, ID_CMD_KEYPRESSED , wParam, lParam);<br />
		}<br />
	} <br />
	// If we haven't returned 1 by the time we get here, then we <br />
	// need to pass on the message to CallNextHookEx. <br />
	return (int)CallNextHookEx(hHook, code, wParam, lParam); <br />
}<br />
SYSTEMHOOK_API int WINAPI InstallHook (HWND hWnd, BOOL bCode )<br />
{ <br />
    int nReturn = 1;<br />
	ghWndMain = hWnd;  // Store app's window handle in DLL global variable <br />
<br />
    // Make sure that we are installing/removing in the proper order <br />
    if (bCode == bHookInstalled) <br />
        return 0; <br />
 <br />
    if (bCode) <br />
    { <br />
        hHook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,ghDLLInst,0); <br />
        if (!hHook) <br />
            return 0; <br />
        bHookInstalled = TRUE; <br />
    } <br />
    else <br />
    { <br />
        nReturn = UnhookWindowsHookEx(hHook); <br />
        bHookInstalled = FALSE; <br />
    } <br />
    return nReturn; <br />
}<br />

void keybd_event( <br />
BYTE bVk, // virtual-key code <br />
BYTE bScan, // hardware scan code <br />
DWORD dwFlags, // flags specifying various function options <br />
DWORD dwExtraInfo // additional data associated with keystroke <br />
);