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Shared memory

, 28 Sep 2002
Share variables in the shared memory across processes
#include "stdafx.h"
#include "testsm.h"
#include "Helpers.h"
#include "WaitMultiVarchDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


CWaitMultiVarchDlg::CWaitMultiVarchDlg(CWnd* pParent)
: CDialog(CWaitMultiVarchDlg::IDD, pParent)
{
	m_psm=NULL;
}



CWaitMultiVarchDlg::CWaitMultiVarchDlg(CSharedMemory *pSharedMemory, CWnd* pParent)
: m_psm(pSharedMemory),
CDialog(CWaitMultiVarchDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CWaitMultiVarchDlg)
	m_bWaitForAll = FALSE;
	m_bSelectAll = FALSE;
	//}}AFX_DATA_INIT
}

void CWaitMultiVarchDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CWaitMultiVarchDlg)
	DDX_Control(pDX, IDC_SELECT_ALL, m_ctrlSelectAll);
	DDX_Control(pDX, IDC_MULTIVAR_LIST, m_ctrMultiVarList);
	DDX_Check(pDX, IDC_WAIT_FOR_ALL, m_bWaitForAll);
	DDX_Check(pDX, IDC_SELECT_ALL, m_bSelectAll);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CWaitMultiVarchDlg, CDialog)
	//{{AFX_MSG_MAP(CWaitMultiVarchDlg)
	ON_BN_CLICKED(IDC_SELECT_ALL, OnSelectAll)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWaitMultiVarchDlg message handlers

BOOL CWaitMultiVarchDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
	m_ctrlSelectAll.SetCheck(0);

	InitHeader();
	InitList();
	return TRUE;              
}


void CWaitMultiVarchDlg::InitHeader()
{
	m_ctrMultiVarList.DeleteAllItems();
	//Column Headers
	//		 	
	/*VERIFY(m_ctrMultiVarList.m_cImageList.Create(IDB_CHECKBOXES, 16, 3, RGB(255, 0, 255)));
	m_ctrMultiVarList.m_HeaderCtrl.SetImageList(&m_ctrMultiVarList.m_cImageList);

	HDITEM hditem;

	for (int i = 0; i < m_ctrMultiVarList.m_HeaderCtrl.GetItemCount(); i++)
	{
		hditem.mask = HDI_IMAGE | HDI_FORMAT;
		m_ctrMultiVarList.m_HeaderCtrl.GetItem(i, &hditem);
		hditem.fmt |=  HDF_IMAGE;
		if (i == 0 || i == 4)
			hditem.iImage = XHEADERCTRL_UNCHECKED_IMAGE;
		else
			hditem.iImage = XHEADERCTRL_NO_IMAGE;

		m_ctrMultiVarList.m_HeaderCtrl.SetItem(i, &hditem);
	}
*/
	CRect rect;
	m_ctrMultiVarList.GetWindowRect(&rect);
	m_ctrMultiVarList.SetExtendedStyle(LVS_EX_HEADERDRAGDROP|LVS_REPORT|LVS_EX_FULLROWSELECT|LVS_EX_ONECLICKACTIVATE|LVS_EX_CHECKBOXES|LVS_EX_TRACKSELECT);	

	CString strHead; 
	strHead.Format(IDS_VARIABLE);
	m_ctrMultiVarList.InsertColumn(0, strHead, LVCFMT_LEFT,rect.Width(), 0);
	m_ctrMultiVarList.SetHeaderCheckedState(0,1);
	
	m_ctrMultiVarList.EnableToolTips(TRUE);
	
}

void CWaitMultiVarchDlg::InitList()
{
	if(m_psm == NULL)
		return;
	m_ctrMultiVarList.DeleteAllItems(); 

	
	LV_ITEM lvitem;
	ValueHeader varInfo;

	TCHAR szText[128];

	DWORD dwCount = m_psm->GetVariablesCount();

	for (DWORD i = 0; i < dwCount; i++)
	{
		m_psm->GetValueInfo(i,&varInfo);

#ifndef _UNICODE
		DWORD dwNamLn = wcslen(varInfo.wszValueName)+2;
		char *szName = new char[dwNamLn];

		WideCharToMultiByte(CP_ACP,0,varInfo.wszValueName,-1,szName,dwNamLn,NULL,NULL);
#endif
		for(int j = 0; j < 1; j++)
		{	
			lvitem.mask = LVIF_TEXT;
			lvitem.iItem = i;
			lvitem.iSubItem = j;

			if(j == 0)
			{
#ifndef _UNICODE
				lvitem.pszText = szName;
				m_ctrMultiVarList.InsertItem(i,szName);
#else
				lvitem.pszText = varInfo.wszValueName;
				m_ctrMultiVarList.InsertItem(i,varInfo.wszValueName);
#endif				
			}
			if(j == 1)
			{
				_tcscpy(szText,_T("No"));
				lvitem.pszText = szText;
				m_ctrMultiVarList.SetItem(&lvitem);				
			}
			m_ctrMultiVarList.SetItemToolTipText(i,j,lvitem.pszText);
			m_ctrMultiVarList.SetCheckbox(i,j,0);
		}
	}
	
#if defined(_DEBUG) && defined(DUMP_SHARED_MEMORY)
	m_psm->Dump(afxDump);
#endif
	UpdateData(FALSE);
}


void CWaitMultiVarchDlg::OnOK() 
{
	CWaitCursor wait;
	UpdateData(TRUE);
	int nCount = m_ctrMultiVarList.GetItemCount();

	for(int i = 0; i < nCount; i++)
	{
		if(m_ctrMultiVarList.GetCheckbox(i,0) == 1)
			m_strArr.Add(m_ctrMultiVarList.GetItemText(i,0));	
	}

	if (m_strArr.GetSize()) {

		DWORD dwRet = m_psm->WaitForMultipleValuesChanges(m_strArr,m_bWaitForAll);
		if(dwRet == WAIT_FAILED)
		{
			CString str;
			GetErrorDescription(m_psm->GetLastError(),str);
			CString msg = _T("Cannot wait: ");
			msg += str;
			AfxMessageBox(msg);
		}
		else if(dwRet == WAIT_TIMEOUT)
		{
			AfxMessageBox(_T("No Change"));		
		}
		else 
		{
			if (m_bWaitForAll) {
				AfxMessageBox(_T("At least one variable has changed."));
			} else {
				CString str;
				str.Format(_T("%s has been changed or removed"),m_strArr.GetAt(WAIT_OBJECT_0 + dwRet));
				AfxMessageBox(str);	
			}
		}
		CDialog::OnOK();
	} else {
		AfxMessageBox(_T("Select at least one variable please."));
	}
}

void CWaitMultiVarchDlg::OnSelectAll() 
{
	UpdateData(TRUE);

	int nCount = m_ctrMultiVarList.GetItemCount();

	for(int i = 0; i < nCount; i++)
	{
		m_ctrMultiVarList.SetCheckbox(i,0,m_bSelectAll);				
	}
	
	m_ctrlSelectAll.SetWindowText(m_bSelectAll ? _T("Unselect all variables") :  _T("Select all variables"));
}

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About the Author

Martin Ziacek
Software Developer (Senior)
United Kingdom United Kingdom
No Biography provided

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