Rebake after adding libs html and xml to samples using lib adv

[wxWidgets.git] / src / msw / dde.cpp

diff --git a/src/msw/dde.cpp b/src/msw/dde.cpp
index c5b16d9dc0019b424fd229da3696d26c487fed19..d69720c31db060a22fdb9a0f4c606b02e04de38b 100644 (file)
--- a/src/msw/dde.cpp
+++ b/src/msw/dde.cpp
@@ -17,10 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#ifdef __GNUG__
-    #pragma implementation "dde.h"
-#endif
-

 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 


@@ -38,36 +34,13 @@
 #include "wx/module.h"
 #include "wx/dde.h"
 #include "wx/intl.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__)
-    #include "wx/msw/gnuwin32/extra.h"
-#endif
-
-// some compilers headers don't define this one (mingw32)
-#ifndef DMLERR_NO_ERROR
-    #define DMLERR_NO_ERROR (0)
-
-    // this one is also missing from some mingw32 headers, but there is no way
-    // to test for it (I know of) - the test for DMLERR_NO_ERROR works for me,
-    // but is surely not the right thing to do
-    extern "C"
-    HDDEDATA STDCALL DdeClientTransaction(LPBYTE pData,
-                                          DWORD cbData,
-                                          HCONV hConv,
-                                          HSZ hszItem,
-                                          UINT wFmt,
-                                          UINT wType,
-                                          DWORD dwTimeout,
-                                          LPDWORD pdwResult);
-#endif // no DMLERR_NO_ERROR
-

 // ----------------------------------------------------------------------------
 // macros and constants
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // macros and constants
 // ----------------------------------------------------------------------------


@@ -113,6 +86,7 @@ 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);


@@ -122,15 +96,17 @@ 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 wxList wxAtomTable(wxKEY_STRING);
+static wxAtomMap wxAtomTable;

 
 #include "wx/listimpl.cpp"
 
 
 #include "wx/listimpl.cpp"
 

-WX_DEFINE_LIST(wxDDEClientList);
-WX_DEFINE_LIST(wxDDEServerList);
-WX_DEFINE_LIST(wxDDEConnectionList);
+WX_DEFINE_LIST(wxDDEClientList)
+WX_DEFINE_LIST(wxDDEServerList)
+WX_DEFINE_LIST(wxDDEConnectionList)

 
 static wxDDEClientList wxDDEClientObjects;
 static wxDDEServerList wxDDEServerObjects;
 
 static wxDDEClientList wxDDEClientObjects;
 static wxDDEServerList wxDDEServerObjects;


@@ -193,15 +169,12 @@ extern void wxDDEInitialize()
 
 void wxDDECleanUp()
 {
 
 void wxDDECleanUp()
 {

-    wxDDEClientObjects.DeleteContents(true);
-    wxDDEClientObjects.Clear();
-    wxDDEClientObjects.DeleteContents(false);
+    // 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") );

 
 

-    wxDDEServerObjects.DeleteContents(true);
-    wxDDEServerObjects.Clear();
-    wxDDEServerObjects.DeleteContents(false);
-
-    wxAtomTable.Clear();
+    wxAtomTable.clear();

 
     if ( DDEIdInst != 0 )
     {
 
     if ( DDEIdInst != 0 )
     {


@@ -217,7 +190,7 @@ void wxDDECleanUp()
 // Global find connection
 static wxDDEConnection *DDEFindConnection(HCONV hConv)
 {
 // Global find connection
 static wxDDEConnection *DDEFindConnection(HCONV hConv)
 {

-    wxDDEServerList::Node *serverNode = wxDDEServerObjects.GetFirst();
+    wxDDEServerList::compatibility_iterator serverNode = wxDDEServerObjects.GetFirst();

     wxDDEConnection *found = NULL;
     while (serverNode && !found)
     {
     wxDDEConnection *found = NULL;
     while (serverNode && !found)
     {


@@ -231,7 +204,7 @@ static wxDDEConnection *DDEFindConnection(HCONV hConv)
         return found;
     }
 
         return found;
     }
 

-    wxDDEClientList::Node *clientNode = wxDDEClientObjects.GetFirst();
+    wxDDEClientList::compatibility_iterator clientNode = wxDDEClientObjects.GetFirst();

     while (clientNode && !found)
     {
         wxDDEClient *object = clientNode->GetData();
     while (clientNode && !found)
     {
         wxDDEClient *object = clientNode->GetData();


@@ -244,7 +217,7 @@ static wxDDEConnection *DDEFindConnection(HCONV hConv)
 // Global delete connection
 static void DDEDeleteConnection(HCONV hConv)
 {
 // Global delete connection
 static void DDEDeleteConnection(HCONV hConv)
 {

-    wxDDEServerList::Node *serverNode = wxDDEServerObjects.GetFirst();
+    wxDDEServerList::compatibility_iterator serverNode = wxDDEServerObjects.GetFirst();

     bool found = false;
     while (serverNode && !found)
     {
     bool found = false;
     while (serverNode && !found)
     {


@@ -257,7 +230,7 @@ static void DDEDeleteConnection(HCONV hConv)
         return;
     }
 
         return;
     }
 

-    wxDDEClientList::Node *clientNode = wxDDEClientObjects.GetFirst();
+    wxDDEClientList::compatibility_iterator clientNode = wxDDEClientObjects.GetFirst();

     while (clientNode && !found)
     {
         wxDDEClient *object = clientNode->GetData();
     while (clientNode && !found)
     {
         wxDDEClient *object = clientNode->GetData();


@@ -269,7 +242,7 @@ static void DDEDeleteConnection(HCONV hConv)
 // 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)
 {

-    wxDDEServerList::Node *node = wxDDEServerObjects.GetFirst();
+    wxDDEServerList::compatibility_iterator node = wxDDEServerObjects.GetFirst();

     wxDDEServer *found = NULL;
     while (node && !found)
     {
     wxDDEServer *found = NULL;
     while (node && !found)
     {


@@ -303,36 +276,55 @@ bool wxDDEServer::Create(const wxString& server)
 {
     m_serviceName = server;
 
 {
     m_serviceName = server;
 

-    if ( !DdeNameService(DDEIdInst, DDEAtomFromString(server), (HSZ)NULL, DNS_REGISTER) )
-    {
-        DDELogError(wxString::Format(_("Failed to register DDE server '%s'"),
-                                     server.c_str()));
+    HSZ hsz = DDEAtomFromString(server);

 
 

+    if ( !hsz )
+    {

         return false;
     }
 
         return false;
     }
 

-    return true;
+
+    bool success = (DdeNameService(DDEIdInst, hsz, (HSZ) NULL, DNS_REGISTER)
+        != NULL);
+
+    if (!success)
+    {
+        DDELogError(wxString::Format(_("Failed to register DDE server '%s'"),
+            server.c_str()));
+    }
+
+    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);
 

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();

     while (node)
     {
         wxDDEConnection *connection = node->GetData();
     while (node)
     {
         wxDDEConnection *connection = node->GetData();

-        wxDDEConnectionList::Node *next = node->GetNext();
+        wxDDEConnectionList::compatibility_iterator next = node->GetNext();

         connection->SetConnected(false);
         connection->OnDisconnect(); // May delete the node implicitly
         node = next;
         connection->SetConnected(false);
         connection->OnDisconnect(); // May delete the node implicitly
         node = next;


@@ -343,7 +335,7 @@ wxDDEServer::~wxDDEServer()
     while (node)
     {
         wxDDEConnection *connection = node->GetData();
     while (node)
     {
         wxDDEConnection *connection = node->GetData();

-        wxDDEConnectionList::Node *next = node->GetNext();
+        wxDDEConnectionList::compatibility_iterator next = node->GetNext();

         delete connection;
         node = next;
     }
         delete connection;
         node = next;
     }


@@ -356,7 +348,7 @@ wxConnectionBase *wxDDEServer::OnAcceptConnection(const wxString& /* topic */)
 
 wxDDEConnection *wxDDEServer::FindConnection(WXHCONV conv)
 {
 
 wxDDEConnection *wxDDEServer::FindConnection(WXHCONV conv)
 {

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();

     wxDDEConnection *found = NULL;
     while (node && !found)
     {
     wxDDEConnection *found = NULL;
     while (node && !found)
     {


@@ -371,22 +363,21 @@ 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)
 {

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
-    bool found = false;
-    while (node && !found)
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
+    while (node)

     {
         wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {
     {
         wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {

-            found = true;
-            delete node;
+            m_connections.Erase(node);
+            return true;

         }
         else
         {
             node = node->GetNext();
         }
     }
         }
         else
         {
             node = node->GetNext();
         }
     }

-    return found;
+    return false;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -403,7 +394,7 @@ wxDDEClient::wxDDEClient()
 wxDDEClient::~wxDDEClient()
 {
     wxDDEClientObjects.DeleteObject(this);
 wxDDEClient::~wxDDEClient()
 {
     wxDDEClientObjects.DeleteObject(this);

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();

     while (node)
     {
         wxDDEConnection *connection = node->GetData();
     while (node)
     {
         wxDDEConnection *connection = node->GetData();


@@ -421,12 +412,35 @@ wxConnectionBase *wxDDEClient::MakeConnection(const wxString& WXUNUSED(host),
                                               const wxString& server,
                                               const wxString& topic)
 {
                                               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
     {


@@ -451,7 +465,7 @@ wxConnectionBase *wxDDEClient::OnMakeConnection()
 
 wxDDEConnection *wxDDEClient::FindConnection(WXHCONV conv)
 {
 
 wxDDEConnection *wxDDEClient::FindConnection(WXHCONV conv)
 {

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();

     wxDDEConnection *found = NULL;
     while (node && !found)
     {
     wxDDEConnection *found = NULL;
     while (node && !found)
     {


@@ -466,19 +480,18 @@ 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)
 {

-    wxDDEConnectionList::Node *node = m_connections.GetFirst();
-    bool found = false;
-    while (node && !found)
+    wxDDEConnectionList::compatibility_iterator node = m_connections.GetFirst();
+    while (node)

     {
         wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {
     {
         wxDDEConnection *connection = node->GetData();
         if (connection->m_hConv == conv)
         {

-            found = true;
-            delete node;
+            m_connections.Erase(node);
+            return true;

         }
         else node = node->GetNext();
     }
         }
         else node = node->GetNext();
     }

-    return found;
+    return false;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -532,18 +545,21 @@ bool wxDDEConnection::Disconnect()
     return ok;
 }
 
     return ok;
 }
 

-bool wxDDEConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
+bool wxDDEConnection::Execute(const wxChar *data, int size, wxIPCFormat WXUNUSED(format))

 {
     DWORD result;
     if (size < 0)
     {
 {
     DWORD result;
     if (size < 0)
     {

-        size = wxStrlen(data) + 1;
+        size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL

     }
 
     }
 

-    bool ok = DdeClientTransaction((LPBYTE)data, size,
+    bool ok = DdeClientTransaction((LPBYTE)data,
+                                    size,

                                     GetHConv(),
                                     NULL,
                                     GetHConv(),
                                     NULL,

-                                    format,
+// If the transaction specified by the wType parameter does not pass data or is XTYP_EXECUTE,
+// wFmt should be zero. 
+                                    0,

                                     XTYP_EXECUTE,
                                     DDE_TIMEOUT,
                                     &result) != 0;
                                     XTYP_EXECUTE,
                                     DDE_TIMEOUT,
                                     &result) != 0;


@@ -580,9 +596,9 @@ wxChar *wxDDEConnection::Request(const wxString& item, int *size, wxIPCFormat fo
     wxChar *data = GetBufferAtLeast( len );
     wxASSERT_MSG(data != NULL,
                  _T("Buffer too small in wxDDEConnection::Request") );
     wxChar *data = GetBufferAtLeast( len );
     wxASSERT_MSG(data != NULL,
                  _T("Buffer too small in wxDDEConnection::Request") );

-    DdeGetData(returned_data, (LPBYTE)data, len, 0);
+    (void) DdeGetData(returned_data, (LPBYTE)data, len, 0);

 
 

-    DdeFreeDataHandle(returned_data);
+    (void) DdeFreeDataHandle(returned_data);

 
     if (size)
         *size = (int)len;
 
     if (size)
         *size = (int)len;


@@ -595,11 +611,12 @@ bool wxDDEConnection::Poke(const wxString& item, wxChar *data, int size, wxIPCFo
     DWORD result;
     if (size < 0)
     {
     DWORD result;
     if (size < 0)
     {

-        size = wxStrlen(data) + 1;
+        size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL

     }
 
     HSZ item_atom = DDEGetAtom(item);
     }
 
     HSZ item_atom = DDEGetAtom(item);

-    bool ok = DdeClientTransaction((LPBYTE)data, size,
+    bool ok = DdeClientTransaction((LPBYTE)data,
+                                   size,

                                    GetHConv(),
                                    item_atom, format,
                                    XTYP_POKE,
                                    GetHConv(),
                                    item_atom, format,
                                    XTYP_POKE,


@@ -659,14 +676,15 @@ bool wxDDEConnection::Advise(const wxString& item,
 {
     if (size < 0)
     {
 {
     if (size < 0)
     {

-        size = wxStrlen(data) + 1;
+        size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL

     }
 
     HSZ item_atom = DDEGetAtom(item);
     HSZ topic_atom = DDEGetAtom(m_topicName);
     m_sendingData = data;  // mrf: potential for scope problems here?
     m_dataSize = size;
     }
 
     HSZ item_atom = DDEGetAtom(item);
     HSZ topic_atom = DDEGetAtom(m_topicName);
     m_sendingData = data;  // mrf: potential for scope problems here?
     m_dataSize = size;

-    m_dataType = format;
+    // wxIPC_PRIVATE does not succeed, so use text instead
+    m_dataType = format == wxIPC_PRIVATE ? wxIPC_TEXT : format;

 
     bool ok = DdePostAdvise(DDEIdInst, topic_atom, item_atom) != 0;
     if ( !ok )
 
     bool ok = DdePostAdvise(DDEIdInst, topic_atom, item_atom) != 0;
     if ( !ok )


@@ -765,10 +783,11 @@ _DDECallback(WORD wType,
 
                     DdeFreeDataHandle(hData);
 
 
                     DdeFreeDataHandle(hData);
 

+// XTYP_EXECUTE cannot be used for arbitrary data, but only for text

                     if ( connection->OnExecute(connection->m_topicName,
                                                data,
                                                (int)len,
                     if ( connection->OnExecute(connection->m_topicName,
                                                data,
                                                (int)len,

-                                               (wxIPCFormat) wFmt) )
+                                               wxIPC_TEXT ) )

                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                     }
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                     }


@@ -793,7 +812,7 @@ _DDECallback(WORD wType,
                     if (data)
                     {
                         if (user_size < 0)
                     if (data)
                     {
                         if (user_size < 0)

-                            user_size = wxStrlen((wxChar*)data) + 1;
+                            user_size = (wxStrlen((wxChar*)data) + 1) * sizeof(wxChar);    // includes final NUL

 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,
 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,


@@ -820,7 +839,7 @@ _DDECallback(WORD wType,
 
                     wxChar *data = connection->GetBufferAtLeast( len );
                     wxASSERT_MSG(data != NULL,
 
                     wxChar *data = connection->GetBufferAtLeast( len );
                     wxASSERT_MSG(data != NULL,

-                                 _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
+                                 _T("Buffer too small in _DDECallback (XTYP_POKE)") );

 
                     DdeGetData(hData, (LPBYTE)data, len, 0);
 
 
                     DdeGetData(hData, (LPBYTE)data, len, 0);
 


@@ -934,26 +953,27 @@ _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->GetData();
-    else
-    {
-        DDEAddAtom(string);
-        return (HSZ)(wxAtomTable.Find(string)->GetData());
-    }
+    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") );


@@ -973,12 +993,20 @@ 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
 // ----------------------------------------------------------------------------