}
 
     DWORD len = DdeGetData(returned_data, NULL, 0, 0);
-    len = ceil( double(len)/sizeof(wxChar) );
+    len = (DWORD)ceil( double(len)/sizeof(wxChar) );
 
     wxChar *data = GetBufferAtLeast( len );
     wxASSERT_MSG(data != NULL,
                 if (connection)
                 {
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
-                    len = ceil( double(len)/sizeof(wxChar) );
+                    len = (DWORD)ceil( double(len)/sizeof(wxChar) );
 
                     wxChar *data = connection->GetBufferAtLeast( len );
                     wxASSERT_MSG(data != NULL,
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
-                    len = ceil( double(len) / sizeof(wxChar) );
+                    len = (DWORD)ceil( double(len) / sizeof(wxChar) );
 
                     wxChar *data = connection->GetBufferAtLeast( len );
                     wxASSERT_MSG(data != NULL,
                     wxString item_name = DDEStringFromAtom(hsz2);
 
                     DWORD len = DdeGetData(hData, NULL, 0, 0);
-                    len = ceil( double(len) / sizeof(wxChar) );
+                    len = (DWORD)ceil( double(len) / sizeof(wxChar) );
 
                     wxChar *data = connection->GetBufferAtLeast( len );
                     wxASSERT_MSG(data != NULL,