Use the current font for the DoGetBestSize calculation

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

diff --git a/src/msw/dde.cpp b/src/msw/dde.cpp
index 606abdac8bc16ce8d2253a0fc8651a05cf9962d4..26a13fc678e989e9e765d1bda136dc2fcdda16cb 100644 (file)
--- a/src/msw/dde.cpp
+++ b/src/msw/dde.cpp
@@ -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
 


@@ -38,36 +38,17 @@
 #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>
 
 #ifdef __GNUWIN32_OLD__
     #include "wx/msw/gnuwin32/extra.h"
 #endif
 
 #include <ddeml.h>
 
 #ifdef __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 +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);


@@ -122,9 +104,11 @@ 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"
 


@@ -193,15 +177,12 @@ extern void wxDDEInitialize()
 
 void wxDDECleanUp()
 {
 
 void wxDDECleanUp()
 {

-    wxDDEClientObjects.DeleteContents(true);
-    wxDDEClientObjects.Clear();
-    wxDDEClientObjects.DeleteContents(false);
-
-    wxDDEServerObjects.DeleteContents(true);
-    wxDDEServerObjects.Clear();
-    wxDDEServerObjects.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") );

 
 

-    wxAtomTable.Clear();
+    wxAtomTable.clear();

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


@@ -217,7 +198,7 @@ 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 +212,7 @@ 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 +225,7 @@ 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 +238,7 @@ 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 +250,7 @@ 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 +284,55 @@ 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 +343,7 @@ 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 +356,7 @@ 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 +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)
 {

-    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 +402,7 @@ 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 +420,35 @@ 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 +473,7 @@ 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 +488,18 @@ 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;

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


@@ -540,7 +561,8 @@ 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,
                                     GetHConv(),
                                     NULL,
                                     format,


@@ -577,15 +599,15 @@ wxChar *wxDDEConnection::Request(const wxString& item, int *size, wxIPCFormat fo
 
     DWORD len = DdeGetData(returned_data, NULL, 0, 0);
 
 
     DWORD len = DdeGetData(returned_data, NULL, 0, 0);
 

-    wxChar *data = GetBufferAtLeast( len );
+    wxChar *data = GetBufferAtLeast( len/sizeof(wxChar) );

     wxASSERT_MSG(data != NULL,
                  _T("Buffer too small in wxDDEConnection::Request") );
     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)
 
     if (size)

-        *size = (int)len;
+        *size = (int)len/sizeof(wxChar);

 
     return data;
 }
 
     return data;
 }


@@ -599,7 +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,


@@ -757,7 +780,7 @@ _DDECallback(WORD wType,
                 {
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 
                 {
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 

-                    wxChar *data = connection->GetBufferAtLeast( len );
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );

                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
 
                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
 


@@ -767,7 +790,7 @@ _DDECallback(WORD wType,
 
                     if ( connection->OnExecute(connection->m_topicName,
                                                data,
 
                     if ( connection->OnExecute(connection->m_topicName,
                                                data,

-                                               (int)len,
+                                               (int)len/sizeof(wxChar),

                                                (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                                                (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;


@@ -797,7 +820,7 @@ _DDECallback(WORD wType,
 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,
 
                         HDDEDATA handle = DdeCreateDataHandle(DDEIdInst,
                                                               (LPBYTE)data,

-                                                              user_size,
+                                                              user_size*sizeof(wxChar),

                                                               0,
                                                               hsz2,
                                                               wFmt,
                                                               0,
                                                               hsz2,
                                                               wFmt,


@@ -818,7 +841,7 @@ _DDECallback(WORD wType,
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 

-                    wxChar *data = connection->GetBufferAtLeast( len );
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );

                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
 
                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_EXECUTE)") );
 


@@ -829,7 +852,7 @@ _DDECallback(WORD wType,
                     connection->OnPoke(connection->m_topicName,
                                        item_name,
                                        data,
                     connection->OnPoke(connection->m_topicName,
                                        item_name,
                                        data,

-                                       (int)len,
+                                       (int)len/sizeof(wxChar),

                                        (wxIPCFormat) wFmt);
 
                     return (DDERETURN)DDE_FACK;
                                        (wxIPCFormat) wFmt);
 
                     return (DDERETURN)DDE_FACK;


@@ -880,7 +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,


@@ -905,7 +928,7 @@ _DDECallback(WORD wType,
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
 

-                    wxChar *data = connection->GetBufferAtLeast( len );
+                    wxChar *data = connection->GetBufferAtLeast( len/sizeof(wxChar) );

                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_ADVDATA)") );
 
                     wxASSERT_MSG(data != NULL,
                                  _T("Buffer too small in _DDECallback (XTYP_ADVDATA)") );
 


@@ -915,7 +938,7 @@ _DDECallback(WORD wType,
                     if ( connection->OnAdvise(connection->m_topicName,
                                               item_name,
                                               data,
                     if ( connection->OnAdvise(connection->m_topicName,
                                               item_name,
                                               data,

-                                              (int)len,
+                                              (int)len/sizeof(wxChar),

                                               (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;
                                               (wxIPCFormat) wFmt) )
                     {
                         return (DDERETURN)(DWORD)DDE_FACK;


@@ -934,26 +957,27 @@ _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 +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
 // ----------------------------------------------------------------------------