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[wxWidgets.git] / src / msw / dde.cpp
diff --git a/src/msw/dde.cpp b/src/msw/dde.cpp
index 0d084650d7322d82d4a3bac66921ccb6da12cc3b..26a13fc678e989e9e765d1bda136dc2fcdda16cb 100644 (file)
--- a/src/msw/dde.cpp
+++ b/src/msw/dde.cpp
@@ -5,7 +5,7 @@
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart and Markus Holzem
+// Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -17,7 +17,7 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
     #pragma implementation "dde.h"
 #endif
 
     #pragma implementation "dde.h"
 #endif
 
@@ -37,14 +37,15 @@
 
 #include "wx/module.h"
 #include "wx/dde.h"
 
 #include "wx/module.h"
 #include "wx/dde.h"
+#include "wx/intl.h"
+#include "wx/hashmap.h"
 
 #include "wx/msw/private.h"
 
 #include <string.h>
 
 #include "wx/msw/private.h"
 
 #include <string.h>
-#include <windows.h>
 #include <ddeml.h>
 
 #include <ddeml.h>
 
-#if defined(__TWIN32__) || defined(__GNUWIN32_OLD__)
+#ifdef __GNUWIN32_OLD__
     #include "wx/msw/gnuwin32/extra.h"
 #endif
 
     #include "wx/msw/gnuwin32/extra.h"
 #endif
 
@@ -93,6 +94,7 @@ static HSZ DDEGetAtom(const wxString& string);
 // string handles
 static HSZ DDEAtomFromString(const wxString& s);
 static wxString DDEStringFromAtom(HSZ hsz);
 // string handles
 static HSZ DDEAtomFromString(const wxString& s);
 static wxString DDEStringFromAtom(HSZ hsz);
+static void DDEFreeString(HSZ hsz);
 
 // error handling
 static wxString DDEGetErrorMsg(UINT error);
 
 // error handling
 static wxString DDEGetErrorMsg(UINT error);
@@ -102,16 +104,22 @@ static void DDELogError(const wxString& s, UINT error = DMLERR_NO_ERROR);
 // global variables
 // ----------------------------------------------------------------------------
 
 // global variables
 // ----------------------------------------------------------------------------
 
+WX_DECLARE_STRING_HASH_MAP( HSZ, wxAtomMap );
+
 static DWORD DDEIdInst = 0L;
 static wxDDEConnection *DDECurrentlyConnecting = NULL;
 static DWORD DDEIdInst = 0L;
 static wxDDEConnection *DDECurrentlyConnecting = NULL;
+static wxAtomMap wxAtomTable;
+
+#include "wx/listimpl.cpp"
 
 
-static wxList wxAtomTable(wxKEY_STRING);
-static wxList wxDDEClientObjects;
-static wxList wxDDEServerObjects;
+WX_DEFINE_LIST(wxDDEClientList);
+WX_DEFINE_LIST(wxDDEServerList);
+WX_DEFINE_LIST(wxDDEConnectionList);
 
 
-char *DDEDefaultIPCBuffer = NULL;
-int DDEDefaultIPCBufferSize = 0;
-static bool DDEInitialized = FALSE;
+static wxDDEClientList wxDDEClientObjects;
+static wxDDEServerList wxDDEServerObjects;
+
+static bool DDEInitialized = false;
 
 // ----------------------------------------------------------------------------
 // private classes
 
 // ----------------------------------------------------------------------------
 // private classes
@@ -124,7 +132,7 @@ class wxDDEModule : public wxModule
 {
 public:
     wxDDEModule() {}
 {
 public:
     wxDDEModule() {}
-    bool OnInit() { return TRUE; }
+    bool OnInit() { return true; }
     void OnExit() { wxDDECleanUp(); }
 
 private:
     void OnExit() { wxDDECleanUp(); }
 
 private:
@@ -162,20 +170,25 @@ extern void wxDDEInitialize()
         }
         else
         {
         }
         else
         {
-            DDEInitialized = TRUE;
+            DDEInitialized = true;
         }
     }
 }
 
 void wxDDECleanUp()
 {
         }
     }
 }
 
 void wxDDECleanUp()
 {
+    // deleting them later won't work as DDE won't be initialized any more
+    wxASSERT_MSG( wxDDEServerObjects.empty() &&
+                    wxDDEClientObjects.empty(),
+                    _T("all DDE objects should be deleted by now") );
+
+    wxAtomTable.clear();
+
     if ( DDEIdInst != 0 )
     {
         DdeUninitialize(DDEIdInst);
         DDEIdInst = 0;
     }
     if ( DDEIdInst != 0 )
     {
         DdeUninitialize(DDEIdInst);
         DDEIdInst = 0;
     }
-
-    delete [] DDEDefaultIPCBuffer;
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
@@ -185,64 +198,75 @@ void wxDDECleanUp()
 // Global find connection
 static wxDDEConnection *DDEFindConnection(HCONV hConv)
 {
 // Global find connection
 static wxDDEConnection *DDEFindConnection(HCONV hConv)
 {
-  wxNode *node = wxDDEServerObjects.First();
-  wxDDEConnection *found = NULL;
-  while (node && !found)
-  {
-    wxDDEServer *object = (wxDDEServer *)node->Data();
-    found = object->FindConnection((WXHCONV) hConv);
-    node = node->Next();
-  }
-  if (found)
-      return found;
-
-  node = wxDDEClientObjects.First();
-  while (node && !found)
-  {
-    wxDDEClient *object = (wxDDEClient *)node->Data();
-    found = object->FindConnection((WXHCONV) hConv);
-    node = node->Next();
-  }
-  return found;
+    wxDDEServerList::compatibility_iterator serverNode = wxDDEServerObjects.GetFirst();
+    wxDDEConnection *found = NULL;
+    while (serverNode && !found)
+    {
+        wxDDEServer *object = serverNode->GetData();
+        found = object->FindConnection((WXHCONV) hConv);
+        serverNode = serverNode->GetNext();
+    }
+
+    if (found)
+    {
+        return found;
+    }
+
+    wxDDEClientList::compatibility_iterator clientNode = wxDDEClientObjects.GetFirst();
+    while (clientNode && !found)
+    {
+        wxDDEClient *object = clientNode->GetData();
+        found = object->FindConnection((WXHCONV) hConv);
+        clientNode = clientNode->GetNext();
+    }
+    return found;
 }
 
 // Global delete connection
 static void DDEDeleteConnection(HCONV hConv)
 {
 }
 
 // Global delete connection
 static void DDEDeleteConnection(HCONV hConv)
 {
-  wxNode *node = wxDDEServerObjects.First();
-  bool found = FALSE;
-  while (node && !found)
-  {
-    wxDDEServer *object = (wxDDEServer *)node->Data();
-    found = object->DeleteConnection((WXHCONV) hConv);
-    node = node->Next();
-  }
-  if (found)
-    return;
-
-  node = wxDDEClientObjects.First();
-  while (node && !found)
-  {
-    wxDDEClient *object = (wxDDEClient *)node->Data();
-    found = object->DeleteConnection((WXHCONV) hConv);
-    node = node->Next();
-  }
+    wxDDEServerList::compatibility_iterator serverNode = wxDDEServerObjects.GetFirst();
+    bool found = false;
+    while (serverNode && !found)
+    {
+        wxDDEServer *object = serverNode->GetData();
+        found = object->DeleteConnection((WXHCONV) hConv);
+        serverNode = serverNode->GetNext();
+    }
+    if (found)
+    {
+        return;
+    }
+
+    wxDDEClientList::compatibility_iterator clientNode = wxDDEClientObjects.GetFirst();
+    while (clientNode && !found)
+    {
+        wxDDEClient *object = clientNode->GetData();
+        found = object->DeleteConnection((WXHCONV) hConv);
+        clientNode = clientNode->GetNext();
+    }
 }
 
 // Find a server from a service name
 static wxDDEServer *DDEFindServer(const wxString& s)
 {
 }
 
 // Find a server from a service name
 static wxDDEServer *DDEFindServer(const wxString& s)
 {
-  wxNode *node = wxDDEServerObjects.First();
-  wxDDEServer *found = NULL;
-  while (node && !found)
-  {
-    wxDDEServer *object = (wxDDEServer *)node->Data();
+    wxDDEServerList::compatibility_iterator node = wxDDEServerObjects.GetFirst();
+    wxDDEServer *found = NULL;
+    while (node && !found)
+    {
+        wxDDEServer *object = node->GetData();
 
 
-    if (object->GetServiceName() == s)
-      found = object;
-    else node = node->Next();
-  }
-  return found;
+        if (object->GetServiceName() == s)
+        {
+            found = object;
+        }
+        else
+        {
+            node = node->GetNext();
+        }
+    }
+
+    return found;
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
@@ -260,46 +284,66 @@ bool wxDDEServer::Create(const wxString& server)
 {
     m_serviceName = server;
 
 {
     m_serviceName = server;
 
-    if ( !DdeNameService(DDEIdInst, DDEAtomFromString(server), (HSZ)NULL, DNS_REGISTER) )
+    HSZ hsz = DDEAtomFromString(server);
+
+    if ( !hsz )
     {
     {
-        DDELogError(wxString::Format(_("Failed to register DDE server '%s'"),
-                                     server.c_str()));
+        return false;
+    }
+
+
+    bool success = (DdeNameService(DDEIdInst, hsz, (HSZ) NULL, DNS_REGISTER)
+        != NULL);
 
 
-        return FALSE;
+    if (!success)
+    {
+        DDELogError(wxString::Format(_("Failed to register DDE server '%s'"),
+            server.c_str()));
     }
 
     }
 
-    return TRUE;
+    DDEFreeString(hsz);
+
+    return success;
 }
 
 wxDDEServer::~wxDDEServer()
 {
 }
 
 wxDDEServer::~wxDDEServer()
 {
-    if ( !!m_serviceName )
+    if ( !m_serviceName.IsEmpty() )
     {
     {
-        if ( !DdeNameService(DDEIdInst, DDEAtomFromString(m_serviceName),
-                             (HSZ)NULL, DNS_UNREGISTER) )
+        HSZ hsz = DDEAtomFromString(m_serviceName);
+
+        if (hsz)
         {
         {
-            DDELogError(wxString::Format(_("Failed to unregister DDE server '%s'"),
-                                         m_serviceName.c_str()));
+            if ( !DdeNameService(DDEIdInst, hsz,
+                (HSZ) NULL, DNS_UNREGISTER) )
+            {
+                DDELogError(wxString::Format(
+                    _("Failed to unregister DDE server '%s'"),
+                    m_serviceName.c_str()));
+            }
+
+            DDEFreeString(hsz);
         }
     }
 
     wxDDEServerObjects.DeleteObject(this);
 
         }
     }
 
     wxDDEServerObjects.DeleteObject(this);
 
-    wxNode *node = m_connections.First();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
     while (node)
     {
     while (node)
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
-        wxNode *next = node->Next();
+        wxDDEConnection *connection = node->GetData();
+        wxDDEConnectionList::compatibility_iterator next = node->GetNext();
+        connection->SetConnected(false);
         connection->OnDisconnect(); // May delete the node implicitly
         node = next;
     }
 
     // If any left after this, delete them
         connection->OnDisconnect(); // May delete the node implicitly
         node = next;
     }
 
     // If any left after this, delete them
-    node = m_connections.First();
+    node = m_connections.GetFirst();
     while (node)
     {
     while (node)
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
-        wxNode *next = node->Next();
+        wxDDEConnection *connection = node->GetData();
+        wxDDEConnectionList::compatibility_iterator next = node->GetNext();
         delete connection;
         node = next;
     }
         delete connection;
         node = next;
     }
@@ -312,14 +356,14 @@ wxConnectionBase *wxDDEServer::OnAcceptConnection(const wxString& /* topic */)
 
 wxDDEConnection *wxDDEServer::FindConnection(WXHCONV conv)
 {
 
 wxDDEConnection *wxDDEServer::FindConnection(WXHCONV conv)
 {
-    wxNode *node = m_connections.First();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
     wxDDEConnection *found = NULL;
     while (node && !found)
     {
     wxDDEConnection *found = NULL;
     while (node && !found)
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
+        wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
             found = connection;
         if (connection->m_hConv == conv)
             found = connection;
-        else node = node->Next();
+        else node = node->GetNext();
     }
     return found;
 }
     }
     return found;
 }
@@ -327,19 +371,21 @@ wxDDEConnection *wxDDEServer::FindConnection(WXHCONV conv)
 // Only delete the entry in the map, not the actual connection
 bool wxDDEServer::DeleteConnection(WXHCONV conv)
 {
 // Only delete the entry in the map, not the actual connection
 bool wxDDEServer::DeleteConnection(WXHCONV conv)
 {
-    wxNode *node = m_connections.First();
-    bool found = FALSE;
-    while (node && !found)
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
+    while (node)
     {
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
+        wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {
         if (connection->m_hConv == conv)
         {
-            found = TRUE;
-            delete node;
+            m_connections.Erase(node);
+            return true;
+        }
+        else
+        {
+            node = node->GetNext();
         }
         }
-        else node = node->Next();
     }
     }
-    return found;
+    return false;
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
@@ -356,31 +402,53 @@ wxDDEClient::wxDDEClient()
 wxDDEClient::~wxDDEClient()
 {
     wxDDEClientObjects.DeleteObject(this);
 wxDDEClient::~wxDDEClient()
 {
     wxDDEClientObjects.DeleteObject(this);
-    wxNode *node = m_connections.First();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
     while (node)
     {
     while (node)
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
+        wxDDEConnection *connection = node->GetData();
         delete connection;  // Deletes the node implicitly (see ~wxDDEConnection)
         delete connection;  // Deletes the node implicitly (see ~wxDDEConnection)
-        node = m_connections.First();
+        node = m_connections.GetFirst();
     }
 }
 
 bool wxDDEClient::ValidHost(const wxString& /* host */)
 {
     }
 }
 
 bool wxDDEClient::ValidHost(const wxString& /* host */)
 {
-    return TRUE;
+    return true;
 }
 
 wxConnectionBase *wxDDEClient::MakeConnection(const wxString& WXUNUSED(host),
                                               const wxString& server,
                                               const wxString& topic)
 {
 }
 
 wxConnectionBase *wxDDEClient::MakeConnection(const wxString& WXUNUSED(host),
                                               const wxString& server,
                                               const wxString& topic)
 {
-    HCONV hConv = DdeConnect(DDEIdInst, DDEAtomFromString(server), DDEAtomFromString(topic),
-                             (PCONVCONTEXT)NULL);
+    HSZ hszServer = DDEAtomFromString(server);
+
+    if ( !hszServer )
+    {
+        return (wxConnectionBase*) NULL;
+    }
+
+
+    HSZ hszTopic = DDEAtomFromString(topic);
+
+    if ( !hszTopic )
+    {
+        DDEFreeString(hszServer);
+        return (wxConnectionBase*) NULL;
+    }
+
+
+    HCONV hConv = ::DdeConnect(DDEIdInst, hszServer, hszTopic,
+        (PCONVCONTEXT) NULL);
+
+    DDEFreeString(hszServer);
+    DDEFreeString(hszTopic);
+
+
     if ( !hConv )
     {
     if ( !hConv )
     {
-        DDELogError(wxString::Format(_("Failed to create connection to "
-                                       "server '%s' on topic '%s'"),
-                                     server.c_str(), topic.c_str()));
+        DDELogError( wxString::Format(
+            _("Failed to create connection to server '%s' on topic '%s'"),
+            server.c_str(), topic.c_str()) );
     }
     else
     {
     }
     else
     {
@@ -405,14 +473,14 @@ wxConnectionBase *wxDDEClient::OnMakeConnection()
 
 wxDDEConnection *wxDDEClient::FindConnection(WXHCONV conv)
 {
 
 wxDDEConnection *wxDDEClient::FindConnection(WXHCONV conv)
 {
-    wxNode *node = m_connections.First();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
     wxDDEConnection *found = NULL;
     while (node && !found)
     {
     wxDDEConnection *found = NULL;
     while (node && !found)
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
+        wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
             found = connection;
         if (connection->m_hConv == conv)
             found = connection;
-        else node = node->Next();
+        else node = node->GetNext();
     }
     return found;
 }
     }
     return found;
 }
@@ -420,40 +488,27 @@ wxDDEConnection *wxDDEClient::FindConnection(WXHCONV conv)
 // Only delete the entry in the map, not the actual connection
 bool wxDDEClient::DeleteConnection(WXHCONV conv)
 {
 // Only delete the entry in the map, not the actual connection
 bool wxDDEClient::DeleteConnection(WXHCONV conv)
 {
-    wxNode *node = m_connections.First();
-    bool found = FALSE;
-    while (node && !found)
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
+    while (node)
     {
     {
-        wxDDEConnection *connection = (wxDDEConnection *)node->Data();
+        wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {
         if (connection->m_hConv == conv)
         {
-            found = TRUE;
-            delete node;
+            m_connections.Erase(node);
+            return true;
         }
         }
-        else node = node->Next();
+        else node = node->GetNext();
     }
     }
-    return found;
+    return false;
 }
 
 // ----------------------------------------------------------------------------
 // wxDDEConnection
 // ----------------------------------------------------------------------------
 
 }
 
 // ----------------------------------------------------------------------------
 // wxDDEConnection
 // ----------------------------------------------------------------------------
 
-wxDDEConnection::wxDDEConnection(char *buffer, int size)
+wxDDEConnection::wxDDEConnection(wxChar *buffer, int size)
+     : wxConnectionBase(buffer, size)
 {
 {
-    if (buffer == NULL)
-    {
-        if (DDEDefaultIPCBuffer == NULL)
-            DDEDefaultIPCBuffer = new char[DDEDefaultIPCBufferSize];
-        m_bufPtr = DDEDefaultIPCBuffer;
-        m_bufSize = DDEDefaultIPCBufferSize;
-    }
-    else
-    {
-        m_bufPtr = buffer;
-        m_bufSize = size;
-    }
-
     m_client = NULL;
     m_server = NULL;
 
     m_client = NULL;
     m_server = NULL;
 
@@ -462,20 +517,17 @@ wxDDEConnection::wxDDEConnection(char *buffer, int size)
 }
 
 wxDDEConnection::wxDDEConnection()
 }
 
 wxDDEConnection::wxDDEConnection()
+     : wxConnectionBase()
 {
     m_hConv = 0;
     m_sendingData = NULL;
     m_server = NULL;
     m_client = NULL;
 {
     m_hConv = 0;
     m_sendingData = NULL;
     m_server = NULL;
     m_client = NULL;
-    if (DDEDefaultIPCBuffer == NULL)
-        DDEDefaultIPCBuffer = new char[DDEDefaultIPCBufferSize];
-
-    m_bufPtr = DDEDefaultIPCBuffer;
-    m_bufSize = DDEDefaultIPCBufferSize;
 }
 
 wxDDEConnection::~wxDDEConnection()
 {
 }
 
 wxDDEConnection::~wxDDEConnection()
 {
+    Disconnect();
     if (m_server)
         m_server->GetConnections().DeleteObject(this);
     else
     if (m_server)
         m_server->GetConnections().DeleteObject(this);
     else
@@ -485,6 +537,9 @@ wxDDEConnection::~wxDDEConnection()
 // Calls that CLIENT can make
 bool wxDDEConnection::Disconnect()
 {
 // Calls that CLIENT can make
 bool wxDDEConnection::Disconnect()
 {
+    if ( !GetConnected() )
+        return true;
+
     DDEDeleteConnection(GetHConv());
 
     bool ok = DdeDisconnect(GetHConv()) != 0;
     DDEDeleteConnection(GetHConv());
 
     bool ok = DdeDisconnect(GetHConv()) != 0;
@@ -493,6 +548,8 @@ bool wxDDEConnection::Disconnect()
         DDELogError(_T("Failed to disconnect from DDE server gracefully"));
     }
 
         DDELogError(_T("Failed to disconnect from DDE server gracefully"));
     }
 
+    SetConnected( false );  // so we don't try and disconnect again
+
     return ok;
 }
 
     return ok;
 }
 
@@ -504,13 +561,15 @@ bool wxDDEConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
         size = wxStrlen(data) + 1;
     }
 
         size = wxStrlen(data) + 1;
     }
 
-    bool ok = DdeClientTransaction((LPBYTE)data, size,
+    bool ok = DdeClientTransaction((LPBYTE)data,
+                                    size * sizeof(wxChar),
                                     GetHConv(),
                                     NULL,
                                     format,
                                     XTYP_EXECUTE,
                                     DDE_TIMEOUT,
                                     &result) != 0;
                                     GetHConv(),
                                     NULL,
                                     format,
                                     XTYP_EXECUTE,
                                     DDE_TIMEOUT,
                                     &result) != 0;
+
     if ( !ok )
     {
         DDELogError(_T("DDE execute request failed"));
     if ( !ok )
     {
         DDELogError(_T("DDE execute request failed"));
@@ -519,9 +578,10 @@ bool wxDDEConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
     return ok;
 }
 
     return ok;
 }
 
-char *wxDDEConnection::Request(const wxString& item, int *size, wxIPCFormat format)
+wxChar *wxDDEConnection::Request(const wxString& item, int *size, wxIPCFormat format)
 {
     DWORD result;
 {
     DWORD result;
+
     HSZ atom = DDEGetAtom(item);
 
     HDDEDATA returned_data = DdeClientTransaction(NULL, 0,
     HSZ atom = DDEGetAtom(item);
 
     HDDEDATA returned_data = DdeClientTransaction(NULL, 0,
@@ -537,14 +597,19 @@ char *wxDDEConnection::Request(const wxString& item, int *size, wxIPCFormat form
         return NULL;
     }
 
         return NULL;
     }
 
-    DWORD len = DdeGetData(returned_data, (LPBYTE)m_bufPtr, m_bufSize, 0);
+    DWORD len = DdeGetData(returned_data, NULL, 0, 0);
+
+    wxChar *data = GetBufferAtLeast( len/sizeof(wxChar) );
+    wxASSERT_MSG(data != NULL,
+                 _T("Buffer too small in wxDDEConnection::Request") );
+    (void) DdeGetData(returned_data, (LPBYTE)data, len, 0);
 
 
-    DdeFreeDataHandle(returned_data);
+    (void) DdeFreeDataHandle(returned_data);
 
     if (size)
 
     if (size)
-        *size = (int)len;
+        *size = (int)len/sizeof(wxChar);
 
 
-    return m_bufPtr;
+    return data;
 }
 
 bool wxDDEConnection::Poke(const wxString& item, wxChar *data, int size, wxIPCFormat format)
 }
 
 bool wxDDEConnection::Poke(const wxString& item, wxChar *data, int size, wxIPCFormat format)
@@ -556,7 +621,8 @@ bool wxDDEConnection::Poke(const wxString& item, wxChar *data, int size, wxIPCFo
     }
 
     HSZ item_atom = DDEGetAtom(item);
     }
 
     HSZ item_atom = DDEGetAtom(item);
-    bool ok = DdeClientTransaction((LPBYTE)data, size,
+    bool ok = DdeClientTransaction((LPBYTE)data,
+                                   size * sizeof(wxChar),
                                    GetHConv(),
                                    item_atom, format,
                                    XTYP_POKE,
                                    GetHConv(),
                                    item_atom, format,
                                    XTYP_POKE,
@@ -621,7 +687,7 @@ bool wxDDEConnection::Advise(const wxString& item,
 
     HSZ item_atom = DDEGetAtom(item);
     HSZ topic_atom = DDEGetAtom(m_topicName);
 
     HSZ item_atom = DDEGetAtom(item);
     HSZ topic_atom = DDEGetAtom(m_topicName);
-    m_sendingData = data;
+    m_sendingData = data;  // mrf: potential for scope problems here?
     m_dataSize = size;
     m_dataType = format;
 
     m_dataSize = size;
     m_dataType = format;
 
@@ -637,7 +703,7 @@ bool wxDDEConnection::Advise(const wxString& item,
 bool wxDDEConnection::OnDisconnect()
 {
     delete this;
 bool wxDDEConnection::OnDisconnect()
 {
     delete this;
-    return TRUE;
+    return true;
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
@@ -674,7 +740,7 @@ _DDECallback(WORD wType,
                         connection->m_hConv = 0;
                         connection->m_topicName = topic;
                         DDECurrentlyConnecting = connection;
                         connection->m_hConv = 0;
                         connection->m_topicName = topic;
                         DDECurrentlyConnecting = connection;
-                        return (DDERETURN)(DWORD)TRUE;
+                        return (DDERETURN)(DWORD)true;
                     }
                 }
                 break;
                     }
                 }
                 break;
@@ -686,7 +752,7 @@ _DDECallback(WORD wType,
                 {
                     DDECurrentlyConnecting->m_hConv = (WXHCONV) hConv;
                     DDECurrentlyConnecting = NULL;
                 {
                     DDECurrentlyConnecting->m_hConv = (WXHCONV) hConv;
                     DDECurrentlyConnecting = NULL;
-                    return (DDERETURN)(DWORD)TRUE;
+                    return (DDERETURN)(DWORD)true;
                 }
                 break;
             }
                 }
                 break;
             }
@@ -694,10 +760,14 @@ _DDECallback(WORD wType,
         case XTYP_DISCONNECT:
             {
                 wxDDEConnection *connection = DDEFindConnection(hConv);
         case XTYP_DISCONNECT:
             {
                 wxDDEConnection *connection = DDEFindConnection(hConv);
-                if (connection && connection->OnDisconnect())
+                if (connection)
                 {
                 {
-                    DDEDeleteConnection(hConv);  // Delete mapping: hConv => connection
-                    return (DDERETURN)(DWORD)TRUE;
+                    connection->SetConnected( false );
+                    if (connection->OnDisconnect())
+                    {
+                        DDEDeleteConnection(hConv);  // Delete mapping: hConv => connection
+                        return (DDERETURN)(DWORD)true;
+                    }
                 }
                 break;
             }
                 }
                 break;
             }
@@ -708,14 +778,19 @@ _DDECallback(WORD wType,
 
                 if (connection)
                 {
 
                 if (connection)
                 {
-                    DWORD len = DdeGetData(hData,
-                                           (LPBYTE)connection->m_bufPtr,
-                                           connection->m_bufSize,
-                                           0);
+                    DWORD len = DdeGetData(hData, NULL, 0, 0);
+
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );
+                    wxASSERT_MSG(data != NULL,
+                                 _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
+
+                    DdeGetData(hData, (LPBYTE)data, len, 0);
+
                     DdeFreeDataHandle(hData);
                     DdeFreeDataHandle(hData);
+
                     if ( connection->OnExecute(connection->m_topicName,
                     if ( connection->OnExecute(connection->m_topicName,
-                                               connection->m_bufPtr,
-                                               (int)len,
+                                               data,
+                                               (int)len/sizeof(wxChar),
                                                (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                                                (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
@@ -734,18 +809,18 @@ _DDECallback(WORD wType,
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                     int user_size = -1;
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                     int user_size = -1;
-                    char *data = connection->OnRequest(connection->m_topicName,
+                    wxChar *data = connection->OnRequest(connection->m_topicName,
                                                        item_name,
                                                        &user_size,
                                                        (wxIPCFormat) wFmt);
                     if (data)
                     {
                         if (user_size < 0)
                                                        item_name,
                                                        &user_size,
                                                        (wxIPCFormat) wFmt);
                     if (data)
                     {
                         if (user_size < 0)
-                            user_size = wxStrlen(data) + 1;
+                            user_size = wxStrlen((wxChar*)data) + 1;
 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,
 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,
-                                                              user_size,
+                                                              user_size*sizeof(wxChar),
                                                               0,
                                                               hsz2,
                                                               wFmt,
                                                               0,
                                                               hsz2,
                                                               wFmt,
@@ -764,16 +839,20 @@ _DDECallback(WORD wType,
                 {
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                 {
                     wxString item_name = DDEStringFromAtom(hsz2);
 
-                    DWORD len = DdeGetData(hData,
-                                           (LPBYTE)connection->m_bufPtr,
-                                           connection->m_bufSize,
-                                           0);
+                    DWORD len = DdeGetData(hData, NULL, 0, 0);
+
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );
+                    wxASSERT_MSG(data != NULL,
+                                 _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
+
+                    DdeGetData(hData, (LPBYTE)data, len, 0);
+
                     DdeFreeDataHandle(hData);
 
                     connection->OnPoke(connection->m_topicName,
                                        item_name,
                     DdeFreeDataHandle(hData);
 
                     connection->OnPoke(connection->m_topicName,
                                        item_name,
-                                       connection->m_bufPtr,
-                                       (int)len,
+                                       data,
+                                       (int)len/sizeof(wxChar),
                                        (wxIPCFormat) wFmt);
 
                     return (DDERETURN)DDE_FACK;
                                        (wxIPCFormat) wFmt);
 
                     return (DDERETURN)DDE_FACK;
@@ -824,7 +903,7 @@ _DDECallback(WORD wType,
                                     (
                                         DDEIdInst,
                                         (LPBYTE)connection->m_sendingData,
                                     (
                                         DDEIdInst,
                                         (LPBYTE)connection->m_sendingData,
-                                        connection->m_dataSize,
+                                        connection->m_dataSize*sizeof(wxChar),
                                         0,
                                         hsz2,
                                         connection->m_dataType,
                                         0,
                                         hsz2,
                                         connection->m_dataType,
@@ -847,15 +926,19 @@ _DDECallback(WORD wType,
                 {
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                 {
                     wxString item_name = DDEStringFromAtom(hsz2);
 
-                    DWORD len = DdeGetData(hData,
-                                           (LPBYTE)connection->m_bufPtr,
-                                           connection->m_bufSize,
-                                           0);
+                    DWORD len = DdeGetData(hData, NULL, 0, 0);
+
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );
+                    wxASSERT_MSG(data != NULL,
+                                 _T("Buffer too small in _DDECallback (XTYP_ADVDATA)") );
+
+                    DdeGetData(hData, (LPBYTE)data, len, 0);
+
                     DdeFreeDataHandle(hData);
                     if ( connection->OnAdvise(connection->m_topicName,
                                               item_name,
                     DdeFreeDataHandle(hData);
                     if ( connection->OnAdvise(connection->m_topicName,
                                               item_name,
-                                              connection->m_bufPtr,
-                                              (int)len,
+                                              data,
+                                              (int)len/sizeof(wxChar),
                                               (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                                               (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
@@ -874,31 +957,32 @@ _DDECallback(WORD wType,
 // ----------------------------------------------------------------------------
 
 // Atom table stuff
 // ----------------------------------------------------------------------------
 
 // Atom table stuff
-static HSZ DDEAddAtom(const wxString& string)
+static HSZ DDEAddAtom(const wxString& str)
 {
 {
-    HSZ atom = DDEAtomFromString(string);
-    wxAtomTable.Append(string, (wxObject *)atom);
+    HSZ atom = DDEAtomFromString(str);
+    wxAtomTable[str] = atom;
     return atom;
 }
 
     return atom;
 }
 
-static HSZ DDEGetAtom(const wxString& string)
+static HSZ DDEGetAtom(const wxString& str)
 {
 {
-    wxNode *node = wxAtomTable.Find(string);
-    if (node)
-        return (HSZ)node->Data();
-    else
-    {
-        DDEAddAtom(string);
-        return (HSZ)(wxAtomTable.Find(string)->Data());
-    }
+    wxAtomMap::iterator it = wxAtomTable.find(str);
+
+    if (it != wxAtomTable.end())
+        return it->second;
+
+    return DDEAddAtom(str);
 }
 
 }
 
-// atom <-> strings
+/* atom <-> strings
+The returned handle has to be freed by the caller (using
+(static) DDEFreeString).
+*/
 static HSZ DDEAtomFromString(const wxString& s)
 {
     wxASSERT_MSG( DDEIdInst, _T("DDE not initialized") );
 
 static HSZ DDEAtomFromString(const wxString& s)
 {
     wxASSERT_MSG( DDEIdInst, _T("DDE not initialized") );
 
-    HSZ hsz = DdeCreateStringHandle(DDEIdInst, s, DDE_CP);
+    HSZ hsz = DdeCreateStringHandle(DDEIdInst, (wxChar*) s.c_str(), DDE_CP);
     if ( !hsz )
     {
         DDELogError(_("Failed to create DDE string"));
     if ( !hsz )
     {
         DDELogError(_("Failed to create DDE string"));
@@ -913,12 +997,20 @@ static wxString DDEStringFromAtom(HSZ hsz)
     static const size_t len = 256;
 
     wxString s;
     static const size_t len = 256;
 
     wxString s;
-    (void)DdeQueryString(DDEIdInst, hsz, s.GetWriteBuf(len), len, DDE_CP);
-    s.UngetWriteBuf();
+    (void)DdeQueryString(DDEIdInst, hsz, wxStringBuffer(s, len), len, DDE_CP);
 
     return s;
 }
 
 
     return s;
 }
 
+static void DDEFreeString(HSZ hsz)
+{
+    // DS: Failure to free a string handle might indicate there's
+    // some other severe error.
+    bool ok = (::DdeFreeStringHandle(DDEIdInst, hsz) != 0);
+    wxASSERT_MSG( ok, wxT("Failed to free DDE string handle") );
+    wxUnusedVar(ok);
+}
+
 // ----------------------------------------------------------------------------
 // error handling
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // error handling
 // ----------------------------------------------------------------------------
@@ -952,10 +1044,10 @@ static wxString DDEGetErrorMsg(UINT error)
             err = _("a request for a synchronous data transaction has timed out.");
             break;
         case DMLERR_DLL_NOT_INITIALIZED:
             err = _("a request for a synchronous data transaction has timed out.");
             break;
         case DMLERR_DLL_NOT_INITIALIZED:
-            err = _("a DDEML function was called without first calling the DdeInitialize function,\n\ror an invalid instance identifier\n\rwas passed to a DDEML function.");
+            err = _("a DDEML function was called without first calling the DdeInitialize function,\nor an invalid instance identifier\nwas passed to a DDEML function.");
             break;
         case DMLERR_DLL_USAGE:
             break;
         case DMLERR_DLL_USAGE:
-            err = _("an application initialized as APPCLASS_MONITOR has\n\rattempted to perform a DDE transaction,\n\ror an application initialized as APPCMD_CLIENTONLY has \n\rattempted to perform server transactions.");
+            err = _("an application initialized as APPCLASS_MONITOR has\nattempted to perform a DDE transaction,\nor an application initialized as APPCMD_CLIENTONLY has \nattempted to perform server transactions.");
             break;
         case DMLERR_EXECACKTIMEOUT:
             err = _("a request for a synchronous execute transaction has timed out.");
             break;
         case DMLERR_EXECACKTIMEOUT:
             err = _("a request for a synchronous execute transaction has timed out.");
@@ -985,7 +1077,7 @@ static wxString DDEGetErrorMsg(UINT error)
             err = _("reentrancy problem.");
             break;
         case DMLERR_SERVER_DIED:
             err = _("reentrancy problem.");
             break;
         case DMLERR_SERVER_DIED:
-            err = _("a server-side transaction was attempted on a conversation\n\rthat was terminated by the client, or the server\n\rterminated before completing a transaction.");
+            err = _("a server-side transaction was attempted on a conversation\nthat was terminated by the client, or the server\nterminated before completing a transaction.");
             break;
         case DMLERR_SYS_ERROR:
             err = _("an internal error has occurred in the DDEML.");
             break;
         case DMLERR_SYS_ERROR:
             err = _("an internal error has occurred in the DDEML.");
@@ -994,7 +1086,7 @@ static wxString DDEGetErrorMsg(UINT error)
             err = _("a request to end an advise transaction has timed out.");
             break;
         case DMLERR_UNFOUND_QUEUE_ID:
             err = _("a request to end an advise transaction has timed out.");
             break;
         case DMLERR_UNFOUND_QUEUE_ID:
-            err = _("an invalid transaction identifier was passed to a DDEML function.\n\rOnce the application has returned from an XTYP_XACT_COMPLETE callback,\n\rthe transaction identifier for that callback is no longer valid.");
+            err = _("an invalid transaction identifier was passed to a DDEML function.\nOnce the application has returned from an XTYP_XACT_COMPLETE callback,\nthe transaction identifier for that callback is no longer valid.");
             break;
         default:
             err.Printf(_("Unknown DDE error %08x"), error);
             break;
         default:
             err.Printf(_("Unknown DDE error %08x"), error);
wxWidgets (Impactor)