How to use global hook with WH_GETMESSAGE

cedricvictor

Dear all: I try to use global hook with WH_GETMESSAGE, but still failed. It work only on my application, not global. My code show as below:

#pragma data_seg (".SHARED")
HHOOK g_hPreviousMsgHook = 0;
HINSTANCE g_hInstance = 0;
#pragma data_seg()
#pragma comment(linker, "/SECTION:.SHARED,RWS")

BOOL CSoundDllApp::InitInstance()
{
CWinApp::InitInstance();
g_hInstance = AfxGetInstanceHandle();
return TRUE;
}

BOOL InstallWinHook()
{
BOOL bReturn = TRUE;
g_hPreviousMsgHook = SetWindowsHookEx(WH_GETMESSAGE,
&MsgHookProcedure, g_hInstance, 0);

if(NULL == g\_hPreviousMsgHook)
{
    bReturn = FALSE;
}
return bReturn;

}

LRESULT CALLBACK MsgHookProcedure(int nCode, WPARAM wParam, LPARAM lParam)
{
if(0 > nCode)
return CallNextHookEx(g_hPreviousMsgHook, nCode,
wParam, lParam);
PMSG data = (PMSG)lParam;

switch(data->message)
{
case WM\_POINTERDOWN:
   Beep(0x7fff, 1000);
break;
}
return CallNextHookEx(g\_hPreviousMouseHook, nCode, wParam,   
                                             lParam);

}

I set 0 into last parameter of setWindowsHookEx api, but it seem like not work. Could someone tell me where's wrong, please? Thanks for your help, Victor

Lost User

This message is directly tied to your message queue as described at http://msdn.microsoft.com/en-us/library/windows/desktop/ms644959(v=vs.85).aspx#whgetmessagehook[^].

cedricvictor

Dear Richard: It mean I just hook message only from application message queue, so I can not get message from anthor place? When I touch on some applications, it works. When I touch on desktop, it does not work. How? Does it mean the touch message on desktop not exist in application message queue? Thanks for your help, Victor

Lost User

Sorry, my original message was incorrect (the MSDN description lacks clarity). This should capture all messages, not just those directed to your application.