C / C++ / MFC

<br />
<br />
(WNDPROC) gfnMyProc;<br />
//in some previous called function<br />
gfnMyProc = (WNDPROC)SetWindowLong(listview, GWL_WNDPROC,(LONG)MyProc);<br />
<br />
LRESULT CALLBACK MyProc(HWND hwnd, UINT uiMsg,WPARAM wParam, LPARAM lParam)<br />
{<br />
	switch (uiMsg)<br />
	{<br />
		case WM_LBUTTONDOWN:<br />
			{<br />
		//your stuff here				<br />
				<br />
				break;<br />
			}<br />
	}<br />
	return CallWindowProc(gfnMyProc, hwnd, uiMsg, wParam, lParam);<br />
}}<br />

<br />
<br />
(WNDPROC) gfnMyProc;<br />
//in some previous called function<br />
gfnMyProc = (WNDPROC)SetWindowLong(listview, GWL_WNDPROC,(LONG)MyProc);<br />
<br />
LRESULT CALLBACK MyProc(HWND hwnd, UINT uiMsg,WPARAM wParam, LPARAM lParam)<br />
{<br />
	switch (uiMsg)<br />
	{<br />
		case WM_LBUTTONDOWN:<br />
			{<br />
		//your stuff here				<br />
				<br />
				break;<br />
			}<br />
	}<br />
	return CallWindowProc(gfnMyProc, hwnd, uiMsg, wParam, lParam);<br />
}<br />

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

CSingleDocTemplate* pDocTemplate;
pDocTemplate = new CSingleDocTemplate(
    IDR_MAINFRAME,
    RUNTIME_CLASS(CMyDoc),
    RUNTIME_CLASS(CMainFrame),       // main SDI frame window
    RUNTIME_CLASS(CForm1));
AddDocTemplate(pDocTemplate);

CView* pActiveView = ((CFrameWnd*) m_pMainWnd)->GetActiveView();

m_pViews[0] = pActiveView;
m_pViews[1] = (CView*) new CForm2;
m_pViews[2] = (CView*) new CForm3;

CDocument* pCurrentDoc = ((CFrameWnd*) m_pMainWnd)->GetActiveDocument();

// Initialize a CCreateContext to point to the active document.
// With this context, the new view is added to the document
// when the view is created in CView::OnCreate().
CCreateContext newContext;
newContext.m_pNewViewClass = NULL;
newContext.m_pNewDocTemplate = NULL;
newContext.m_pLastView = NULL;
newContext.m_pCurrentFrame = NULL;
newContext.m_pCurrentDoc = pCurrentDoc;

// The ID of the initial active view is AFX_IDW_PANE_FIRST.
// Incrementing this value by one for additional views works
// in the standard document/view case but the technique cannot
// be extended for the CSplitterWnd case.
UINT viewID[3];
viewID[1] = AFX_IDW_PANE_FIRST + 1;
viewID[2] = AFX_IDW_PANE_FIRST + 2;
CRect rect(0, 0, 0, 0); // gets resized later

// Need to cast pointers to have correct Create functions called
for ( int nView=1; nView<NUMVIEWS; nView++ )
{
    // Create the new view. In this example, the view persists for
    // the life of the application. The application automatically
    // deletes the view when the application is closed.
    m_pViews[nView]->Create(NULL, NULL,
            (AFX_WS_DEFAULT_VIEW & ~WS_VISIBLE),
        // views are created with the style of AFX_WS_DEFAULT_VIEW
        // In MFC 4.0, this is (WS_BORDER | WS_VISIBLE | WS_CHILD)
                    rect, m_pMainWnd,
            viewID[nView], &newContext);
}

// When a document template creates a view, the WM_INITIALUPDATE
// message is sent automatically. However, this code must
// explicitly send the message to the extra views as follows.
((CForm2*)m_pViews[1])->OnInitialUpdate();
((CForm3*)m_pViews[2])->OnInitialUpdate();

CView* CMyApp::SwitchView( UINT nIndex, BOOL bSaveData /*=TRUE*/ )
{
    ASSERT( nIndex >=0 && nIndex < NUMVIEWS );
    
    CView* pNewView = m_pViews[nIndex];
    
    CView* pActiveView = ((CFrameWnd*) m_pMainWnd)->GetActiveView();
    
    if ( !pActiveView )    // No currently active view
        return NULL;
    
    if ( pNewView == pActiveView )    // Already there
        return pActiveView;
        
    // Update Doc's data if needed
    // Don't change view if data valiation fails
    if(bSaveData)
    {
        // this will give you the ability to save the contents of the Form to the document
        // or wherever - implement SaveActiveViewsData() however you want...
	if  (!SaveActiveViewsData() )
	{
  	   return pActiveView;
	}
    }

    // exchange view window ID's so RecalcLayout() works
    UINT temp = ::GetWindowLong(pActiveView->m_hWnd, GWL_ID);
    ::SetWindowLong(pActiveView->m_hWnd, GWL_ID,::GetWindowLong(pNewView->m_hWnd, GWL_ID));
    ::SetWindowLong(pNewView->m_hWnd, GWL_ID, temp);

    // Display and update the new current view - hide the old one    
    pActiveView->ShowWindow(SW_HIDE);
    ((CFormView*)pNewView)->ResizeParentToFit(FALSE);
    ((CFrameWnd*) m_pMainWnd)->SetActiveView(pNewView);
    pNewView->ShowWindow(SW_SHOW);

    return pActiveView;
}

<br />
((CFormView*)pNewView)->ResizeParentToFit(FALSE);<br />

<br />
((CFrameWnd*) m_pMainWnd)->RecalcLayout();<br />

<big>bool CTestGUI1Dlg::WaitForMutex(void)<br />
{<br />
	/* This procedure will wait for a Mutex before allowing any<br />
	   write access to the shared area.	*/<br />
<br />
	// Client needs to create a Mutex for shared memory access<br />
	m_hMutex = ::CreateMutex(	NULL,<br />
								FALSE,<br />
								"CSLSharedMemLock"<br />
							);<br />
<br />
	if(m_hMutex)<br />
	{<br />
		if (::WaitForSingleObject(m_hMutex,INFINITE) == WAIT_OBJECT_0)<br />
		{<br />
			ReleaseMutex(m_hMutex);<br />
			return true;<br />
		}<br />
	}<br />
	return false;<br />
}</big>

<big><br />
bool CTestGUI1Dlg::WaitForMutex(void)<br />
{<br />
	/* This procedure will wait for a Mutex before allowing any<br />
	   write access to the shared area.	*/<br />
<br />
	// Client needs to create a Mutex for shared memory access<br />
<br />
	if(m_hMutex)<br />
	{<br />
		if (::WaitForSingleObject(m_hMutex,300) == WAIT_OBJECT_0)<br />
		{<br />
			ReleaseMutex(m_hMutex);<br />
			return true;<br />
		}<br />
	}<br />
	int error = GetLastError();<br />
	return false;<br />
}</big>