Re: SendMessage WM_NOTIFY across process

 Headache <>
Mon, 02 Jul 2007 01:31:13 -0700
I thought Windows might marshall the simple types too. I guess I've
been working too long with COM. However, I tried this in a single
process and still couldn't get it to work. This time I see the message
in Spy++. Looking at the MFC source code it seems to frig WM_NOTIFY
messages. Anyhow here is my source. I send the message in another
thread (as I guess my handler is on the main thread which is blocked
waiting on a SendMessage) and I'm new'ing the structure on the heap
and not even deleting it. I don't get into the MainFrame OnClick
handler even though it is in the message map. It makes me think I'm
missing something simple. Don't ask about where I break out the code
in OnCmdMsg - it was code I wrote while looking at the framework. Once
I get this going I'll have a look at the SendMessageRemote suggestion.

// MainFrm.cpp : implementation of the CMainFrame class

#include "stdafx.h"
#include "WmNotify.h"

#include "MainFrm.h"
#include ".\mainfrm.h"

#ifdef _DEBUG
#define new DEBUG_NEW

// CMainFrame


   ON_NOTIFY(NM_CLICK, 0, OnClick)

static UINT indicators[] =
    ID_SEPARATOR, // status line indicator

UINT __cdecl SendMessageToMainWnd(LPVOID pParam)
   ::ZeroMemory(pNMIA, sizeof(NMITEMACTIVATE));
   // Set up header
   pNMIA->hdr.code = NM_CLICK;
   pNMIA->hdr.hwndFrom = ::AfxGetMainWnd()->GetSafeHwnd();
   pNMIA->hdr.idFrom = 426;
   // Setup item and subitem
   pNMIA->iItem = 1;
   pNMIA->iSubItem = 2;

   //DWORD dwThreadID = (DWORD)pParam;
   ::AfxGetMainWnd()->SendMessage(WM_NOTIFY, pNMIA->hdr.idFrom,

   return 0;

// CMainFrame construction/destruction

    // TODO: add member initialization code here


int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
    if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
        return -1;

    if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE
        TRACE0("Failed to create toolbar\n");
        return -1; // fail to create

    if (!m_wndStatusBar.Create(this) ||
        TRACE0("Failed to create status bar\n");
        return -1; // fail to create
    // TODO: Delete these three lines if you don't want the toolbar to be

    return 0;

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
    if( !CFrameWnd::PreCreateWindow(cs) )
        return FALSE;
    // TODO: Modify the Window class or styles here by modifying
    // the CREATESTRUCT cs

    return TRUE;

// CMainFrame diagnostics

#ifdef _DEBUG
void CMainFrame::AssertValid() const

void CMainFrame::Dump(CDumpContext& dc) const

#endif //_DEBUG

// CMainFrame message handlers
void CMainFrame::OnClick(NMHDR *pNMHDR, LRESULT* pResult)
   ASSERT(NM_CLICK == pNMHDR->code);


   *pResult = 1;

void CMainFrame::OnSendMessage()
   ::AfxBeginThread(SendMessageToMainWnd, (LPVOID)::AfxGetApp()-



BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra,
   // TODO: Add your specialized code here and/or call the base class
   if ( (HIWORD(nCode) == WM_NOTIFY) && (LOWORD(nCode) == NM_CLICK) )
      CString str;
      str.Format(_T("Msg = %d, nCode = %d\n"), HIWORD(nCode),
   return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);

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