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DLL with UI Threads

Posted on 2001-07-16
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Last Modified: 2013-11-20
I have a CTreeCtrl and a List Box in the DLL.  When implementing the threads, the CTreeCtrl and List Box were destroyed when the control moves back to the main program.
How can I hold the CTreeCtrl and List Box (with data in them)?  Can anyone help?  Thanks.

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Question by:cindywan
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Accepted Solution

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MichaelS earned 50 total points
ID: 6288851
You have to define it like global variables for example.
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Author Comment

by:cindywan
ID: 6288866
I did.  I also use TldSetValue() to set (LPVOID) lParam into memory space, but it doesn't seems to work.
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LVL 6

Expert Comment

by:MichaelS
ID: 6288873
Well, why than you accepted my comment as answer? Anyway, can you show your code?
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Author Comment

by:cindywan
ID: 6292697
// TreeDlg.cpp : implementation file
//

#include "stdafx.h"
#include "RouteDLL2.h"
#include "TreeDlg.h"
#include <string.h>

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


CString *Arrayx, *tmpRoute;
TVINSERTSTRUCT tvInsert;
HTREEITEM hRoot;
HTREEITEM hItem1, hItem2;
HTREEITEM hParent1, hParent2;
long IdxCnt1 = 0, numNode1 = 0, numNode2 = 0;

DWORD      dwTlsIndex1=0;
DWORD      dwTlsIndex2=0;

/////////////////////////////////////////////////////////////////////////////
// CTreeDlg dialog


CTreeDlg::CTreeDlg(CWnd* pParent /*=NULL*/)
      : CDialog(CTreeDlg::IDD, pParent)
{
      //{{AFX_DATA_INIT(CTreeDlg)
            // NOTE: the ClassWizard will add member initialization here
      //}}AFX_DATA_INIT
}


void CTreeDlg::DoDataExchange(CDataExchange* pDX)
{
      CDialog::DoDataExchange(pDX);
      //{{AFX_DATA_MAP(CTreeDlg)
      DDX_Control(pDX, IDC_BUTTON1, m_pButton1);
      DDX_Control(pDX, IDC_LIST3, m_pList3);
      DDX_Control(pDX, IDC_LIST2, m_pList2);
      DDX_Control(pDX, IDC_LIST1, m_pList1);
      DDX_Control(pDX, IDC_TREE2, m_pTree2);
      DDX_Control(pDX, IDC_TREE1, m_pTree1);
      //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CTreeDlg, CDialog)
      //{{AFX_MSG_MAP(CTreeDlg)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTreeDlg message handlers

BOOL CTreeDlg::OnInitDialog()
{
      CDialog::OnInitDialog();

      return TRUE;  // return TRUE unless you set the focus to a control
                    // EXCEPTION: OCX Property Pages should return FALSE
}

void CTreeDlg::OnOK()
{
      CDialog::OnOK();
}


long CTreeDlg::StartRoute(long start, long end)
{
      long total;

      ThreadParams * th1 = new ThreadParams;
      ThreadParams * th2 = new ThreadParams;

      // Draw nodes on Tree 1
      tvInsert.hParent = NULL;
      tvInsert.hInsertAfter = NULL;
      tvInsert.item.mask = TVIF_TEXT;
      tvInsert.item.pszText = "Parent";
      hRoot = m_pTree1.InsertItem(&tvInsert);
      m_pTree1.EnsureVisible(hRoot);
                  
      for (IdxCnt1 = 0; IdxCnt1 < 5; IdxCnt1++)
      {
            tvInsert.hParent = hRoot;
            tvInsert.hInsertAfter = NULL;
            tvInsert.item.mask = TVIF_TEXT;
            tvInsert.item.pszText = "Child";
            HTREEITEM hFirst = m_pTree1.InsertItem(&tvInsert);
            if (IdxCnt1 == 0)      hParent1 = hFirst;
            m_pTree1.EnsureVisible(hFirst);
            m_pList1.InsertString(-1, "Child");
            m_pList1.SetCurSel(m_pList1.GetCount()-1);
      }

      // Draw nodes on Tree 2
      tvInsert.hParent = NULL;
      tvInsert.hInsertAfter = NULL;
      tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
      tvInsert.item.pszText = "Parent";
      hRoot = m_pTree2.InsertItem(&tvInsert);
      m_pTree2.EnsureVisible(hRoot);
                  
      for (IdxCnt1 = 0; IdxCnt1 < 5; IdxCnt1++)
      {
            tvInsert.hParent = hRoot;
            tvInsert.hInsertAfter = NULL;
            tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
            tvInsert.item.pszText = "Child";
            HTREEITEM hSecond = m_pTree2.InsertItem(&tvInsert);
            if (IdxCnt1 == 0)      hParent2 = hSecond;
            m_pTree2.EnsureVisible(hSecond);
            m_pList2.InsertString(-1, "Child");
            m_pList2.SetCurSel(m_pList2.GetCount()-1);
      }

      // threads start
      th1->list1 = &m_pList1;
      th1->list2 = &m_pList2;
      th1->list3 = &m_pList3;
      th1->tree1 = &m_pTree1;
      th1->tree2 = &m_pTree2;
      th1->cs = &mc;
      dwTlsIndex1 = TlsAlloc();
      AfxBeginThread(SubStart, (LPVOID) th1);
      Sleep(2000);
      
      th2->list1 = &m_pList1;
      th2->list2 = &m_pList2;
      th2->list3 = &m_pList3;
      th2->tree1 = &m_pTree1;
      th2->tree2 = &m_pTree2;
      th2->cs = &mc;
      dwTlsIndex2 = TlsAlloc();
      AfxBeginThread(SubEnd, (LPVOID) th2);
      Sleep(2000);

      return total = m_pList1.GetCount();
}


UINT SubStart(LPVOID pParam1)
{
      long s1 = 0, s2 = 0;


      ThreadParams *th1 = (ThreadParams *) pParam1;
      TlsSetValue(dwTlsIndex1, &th1);

      numNode1 = th1->tree1->GetCount();

      if (numNode1 == 0)
      {
            TlsFree(dwTlsIndex1);
            AfxEndThread(WM_QUIT, true);
            return true;
      }

      // Go through each child and add in two children each.
      for (s1 = 0; s1 < numNode1; s1++)
      {
            // higlight the next node
            th1->tree1->SelectItem(th1->tree1->GetNextItem(hParent1, TVGN_NEXT));
            hItem1 = th1->tree1->GetSelectedItem();

            // Add Children
            for (s2 = 0; s2 < 2; s2++)
            {
                  tvInsert.hParent = hParent1;
                  tvInsert.hInsertAfter = hParent1;
                  tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
                  tvInsert.item.pszText = "GrandChild";
                  HTREEITEM hFirst = th1->tree1->InsertItem(&tvInsert);
                  th1->tree1->EnsureVisible(hFirst);
                  // Insert into a list box
                  th1->list1->InsertString(-1, "GrandChild");
                  th1->list1->SetCurSel(th1->list1->GetCount() - 1);
            }

            // if there is no next node in the tree
            if (hItem1 == NULL)
            {
                  TlsFree(dwTlsIndex1);
                  AfxEndThread(WM_QUIT, true);
                  return true;
            }
            else
            {
                  hParent1 = hItem1;
            }
      }

      TlsFree(dwTlsIndex1);
      AfxEndThread(WM_QUIT, true);
      return true;
}


UINT SubEnd(LPVOID pParam2)
{
      long e1 = 0, e2 = 0;

      ThreadParams *th2 = (ThreadParams *) pParam2;
      TlsSetValue(dwTlsIndex2, &th2);

      numNode2 = th2->tree2->GetCount();

      if (numNode2 == 0)
      {
            TlsFree(dwTlsIndex2);
            AfxEndThread(WM_QUIT, true);
            return true;
      }

      // Go through each child and add in two children each.
      for (e1 = 0; e1 < 5; e1++)
      {
            // higlight the next node
            th2->tree2->SelectItem(th2->tree2->GetNextItem(hParent2, TVGN_NEXT));
            hItem2 = th2->tree2->GetSelectedItem();

            // Add Children
            for (e2 = 0; e2 < 2; e2++)
            {
                  tvInsert.hParent = hParent2;
                  tvInsert.hInsertAfter = hParent2;
                  tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
                  tvInsert.item.pszText = "GrandChild";
                  HTREEITEM hSecond = th2->tree2->InsertItem(&tvInsert);
                  th2->tree2->EnsureVisible(hSecond);
                  // Insert into a list box
                  th2->list2->InsertString(-1, "GrandChild");
                  th2->list2->SetCurSel(th2->list2->GetCount() - 1);
            }

            // if there is no next node in the tree
            if (hItem2 == NULL)
            {
                  TlsFree(dwTlsIndex2);
                  AfxEndThread(WM_QUIT, true);
                  return true;
            }
            else
            {
                  hParent2 = hItem2;
            }
      }

      TlsFree(dwTlsIndex2);
      AfxEndThread(WM_QUIT, true);
      return true;
}
0
 

Author Comment

by:cindywan
ID: 6292708

long __stdcall OFFRoute(long start, long end)
{
      AFX_MANAGE_STATE(AfxGetStaticModuleState());

      long i = 0;
      CTreeDlg dlg;

      dlg.Create(IDD_TREEDLG, NULL);
      dlg.ShowWindow(SW_SHOW);

      i = dlg.StartRoute (start, end);
      return i;
}


// TreeDlg.cpp : implementation file
//
#include "stdafx.h"
#include "RouteDLL2.h"
#include "TreeDlg.h"
#include <string.h>

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


CString *Arrayx, *tmpRoute;
TVINSERTSTRUCT tvInsert;
HTREEITEM hRoot;
HTREEITEM hItem1, hItem2;
HTREEITEM hParent1, hParent2;
long IdxCnt1 = 0, numNode1 = 0, numNode2 = 0;

DWORD      dwTlsIndex1=0;
DWORD      dwTlsIndex2=0;

/////////////////////////////////////////////////////////////////////////////
// CTreeDlg dialog


CTreeDlg::CTreeDlg(CWnd* pParent /*=NULL*/)
      : CDialog(CTreeDlg::IDD, pParent)
{
      //{{AFX_DATA_INIT(CTreeDlg)
            // NOTE: the ClassWizard will add member initialization here
      //}}AFX_DATA_INIT
}


void CTreeDlg::DoDataExchange(CDataExchange* pDX)
{
      CDialog::DoDataExchange(pDX);
      //{{AFX_DATA_MAP(CTreeDlg)
      DDX_Control(pDX, IDC_BUTTON1, m_pButton1);
      DDX_Control(pDX, IDC_LIST3, m_pList3);
      DDX_Control(pDX, IDC_LIST2, m_pList2);
      DDX_Control(pDX, IDC_LIST1, m_pList1);
      DDX_Control(pDX, IDC_TREE2, m_pTree2);
      DDX_Control(pDX, IDC_TREE1, m_pTree1);
      //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CTreeDlg, CDialog)
      //{{AFX_MSG_MAP(CTreeDlg)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTreeDlg message handlers

BOOL CTreeDlg::OnInitDialog()
{
      CDialog::OnInitDialog();

      return TRUE;  // return TRUE unless you set the focus to a control
                    // EXCEPTION: OCX Property Pages should return FALSE
}

void CTreeDlg::OnOK()
{
      CDialog::OnOK();
}


long CTreeDlg::StartRoute(long start, long end)
{
      long total;

      ThreadParams * th1 = new ThreadParams;
      ThreadParams * th2 = new ThreadParams;

      // Draw nodes on Tree 1
      tvInsert.hParent = NULL;
      tvInsert.hInsertAfter = NULL;
      tvInsert.item.mask = TVIF_TEXT;
      tvInsert.item.pszText = "Parent";
      hRoot = m_pTree1.InsertItem(&tvInsert);
      m_pTree1.EnsureVisible(hRoot);
                  
      for (IdxCnt1 = 0; IdxCnt1 < 5; IdxCnt1++)
      {
            tvInsert.hParent = hRoot;
            tvInsert.hInsertAfter = NULL;
            tvInsert.item.mask = TVIF_TEXT;
            tvInsert.item.pszText = "Child";
            HTREEITEM hFirst = m_pTree1.InsertItem(&tvInsert);
            if (IdxCnt1 == 0)      hParent1 = hFirst;
            m_pTree1.EnsureVisible(hFirst);
            m_pList1.InsertString(-1, "Child");
            m_pList1.SetCurSel(m_pList1.GetCount()-1);
      }

      // Draw nodes on Tree 2
      tvInsert.hParent = NULL;
      tvInsert.hInsertAfter = NULL;
      tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
      tvInsert.item.pszText = "Parent";
      hRoot = m_pTree2.InsertItem(&tvInsert);
      m_pTree2.EnsureVisible(hRoot);
                  
      for (IdxCnt1 = 0; IdxCnt1 < 5; IdxCnt1++)
      {
            tvInsert.hParent = hRoot;
            tvInsert.hInsertAfter = NULL;
            tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
            tvInsert.item.pszText = "Child";
            HTREEITEM hSecond = m_pTree2.InsertItem(&tvInsert);
            if (IdxCnt1 == 0)      hParent2 = hSecond;
            m_pTree2.EnsureVisible(hSecond);
            m_pList2.InsertString(-1, "Child");
            m_pList2.SetCurSel(m_pList2.GetCount()-1);
      }

      // threads start
      th1->list1 = &m_pList1;
      th1->list2 = &m_pList2;
      th1->list3 = &m_pList3;
      th1->tree1 = &m_pTree1;
      th1->tree2 = &m_pTree2;
      th1->cs = &mc;
      dwTlsIndex1 = TlsAlloc();
      AfxBeginThread(SubStart, (LPVOID) th1);
      Sleep(2000);
      
      th2->list1 = &m_pList1;
      th2->list2 = &m_pList2;
      th2->list3 = &m_pList3;
      th2->tree1 = &m_pTree1;
      th2->tree2 = &m_pTree2;
      th2->cs = &mc;
      dwTlsIndex2 = TlsAlloc();
      AfxBeginThread(SubEnd, (LPVOID) th2);
      Sleep(2000);

      return total = m_pList1.GetCount();
}


UINT SubStart(LPVOID pParam1)
{
      long s1 = 0, s2 = 0;


      ThreadParams *th1 = (ThreadParams *) pParam1;
      TlsSetValue(dwTlsIndex1, &th1);

      numNode1 = th1->tree1->GetCount();

      if (numNode1 == 0)
      {
            TlsFree(dwTlsIndex1);
            AfxEndThread(WM_QUIT, true);
            return true;
      }

      // Go through each child and add in two children each.
      for (s1 = 0; s1 < numNode1; s1++)
      {
            // higlight the next node
            th1->tree1->SelectItem(th1->tree1->GetNextItem(hParent1, TVGN_NEXT));
            hItem1 = th1->tree1->GetSelectedItem();

            // Add Children
            for (s2 = 0; s2 < 2; s2++)
            {
                  tvInsert.hParent = hParent1;
                  tvInsert.hInsertAfter = hParent1;
                  tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
                  tvInsert.item.pszText = "GrandChild";
                  HTREEITEM hFirst = th1->tree1->InsertItem(&tvInsert);
                  th1->tree1->EnsureVisible(hFirst);
                  // Insert into a list box
                  th1->list1->InsertString(-1, "GrandChild");
                  th1->list1->SetCurSel(th1->list1->GetCount() - 1);
            }

            // if there is no next node in the tree
            if (hItem1 == NULL)
            {
                  TlsFree(dwTlsIndex1);
                  AfxEndThread(WM_QUIT, true);
                  return true;
            }
            else
            {
                  hParent1 = hItem1;
            }
      }

      TlsFree(dwTlsIndex1);
      AfxEndThread(WM_QUIT, true);
      return true;
}


UINT SubEnd(LPVOID pParam2)
{
      long e1 = 0, e2 = 0;

      ThreadParams *th2 = (ThreadParams *) pParam2;
      TlsSetValue(dwTlsIndex2, &th2);

      numNode2 = th2->tree2->GetCount();

      if (numNode2 == 0)
      {
            TlsFree(dwTlsIndex2);
            AfxEndThread(WM_QUIT, true);
            return true;
      }

      // Go through each child and add in two children each.
      for (e1 = 0; e1 < 5; e1++)
      {
            // higlight the next node
            th2->tree2->SelectItem(th2->tree2->GetNextItem(hParent2, TVGN_NEXT));
            hItem2 = th2->tree2->GetSelectedItem();

            // Add Children
            for (e2 = 0; e2 < 2; e2++)
            {
                  tvInsert.hParent = hParent2;
                  tvInsert.hInsertAfter = hParent2;
                  tvInsert.item.mask = TVIF_PARAM | TVIF_TEXT;
                  tvInsert.item.pszText = "GrandChild";
                  HTREEITEM hSecond = th2->tree2->InsertItem(&tvInsert);
                  th2->tree2->EnsureVisible(hSecond);
                  // Insert into a list box
                  th2->list2->InsertString(-1, "GrandChild");
                  th2->list2->SetCurSel(th2->list2->GetCount() - 1);
            }

            // if there is no next node in the tree
            if (hItem2 == NULL)
            {
                  TlsFree(dwTlsIndex2);
                  AfxEndThread(WM_QUIT, true);
                  return true;
            }
            else
            {
                  hParent2 = hItem2;
            }
      }

      TlsFree(dwTlsIndex2);
      AfxEndThread(WM_QUIT, true);
      return true;
}

//////////////////
// Test Program //
//////////////////
case IDC_BUTTON1:
{
      
    total = OFFRoute(1, 10);
    if (total >= 0)
      MessageBox(NULL, "Result found", NULL, MB_OK);
    else
      MessageBox(NULL, "No Result found", NULL, MB_OK);
    break;
}
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